Fleur De Lys Research Articles

To Keep or Not to Keep? The Hamletic Umbilical Dilemma: Preservation versus Reconstruction of the Umbilicus in Vertical Abdominoplasty.

(1) Background: The role of the umbilical scar and its repositioning remains one of the most important surgical steps in the execution of any type of abdominoplasty, including those involving "inverted-t" or "fleur de lys" incisions. A consequence of this is a surgeon's Hamletic dilemma: to keep or not to keep the original umbilical scar? (2) Methods: A retrospective observational study was conducted on all patients undergoing "T-inverted" abdominoplasty at the Department of Plastic Surgery of the Santa Maria alle Scotte University Hospital, Siena, between January 2018 and December 2020. Twelve months after the surgery we submitted to all patients the U-score questionnaire about their feelings about their umbilicus's appearance. Patients could assign a score from 1 (very dissatisfied) to 4 (very satisfied) to each of the five items of the score. (3) Results: The average of the scores attributed by the nine patients in whom the navel was preserved is 13 (Range 10-17), while in patients on whom a navel reconstruction was performed, the mean score is 16.8 (Range 12-20). The mean score of patients with a reconstructed umbilicus is, therefore, statistically higher than that of the other group of patients (t-value = 3.88, p = 0.000374) with an average increase of 3.8 points. (4) Conclusions: We can state that the reconstruction of a new navel is the right answer to the Hamletic dilemma in patients having undergone vertical or anchor abdominoplasty.

Fleur-de-Lys Myocutaneous Flap for Complex Sacral Reconstruction

INTRODUCTION: Massive sacral defect resulting from total sacrectomy presents a reconstructive challenge,1 and in some cases, the use of vertical or transverse Rectus Abdominis Muscle (RAM) flap may not provide enough soft tissue to reconstruct it. The use of Fleur-de-lys flap technique has been described in cases of autologous breast reconstruction and for thoracic wound defects.2,3 The aim of this study is to describe the surgical technique of the combination of Transversal Rectus Abdominis Muscle (TRAM) flap with the Vertical Rectus Abdominis Muscle (VRAM) flap, which assumes the form of a “Fleur-de-lys”, and to identify the population of patients reconstructed by this technique followed sacral resection. METHODS: A retrospective chart review was conducted on patients undergoing oncologic sacral resections followed by Fleur-de-lys myocutaneous flap for soft tissue reconstruction between December 2008 and December 2019. Demographics, clinical and surgical characteristics, postoperative outcomes, and complications were reviewed. RESULTS: Two patients underwent Fleur-de-lys myocutaneous flap to sacral reconstruction. A 44-year-old male and a 31-year-old female, both patients presented with a locally advanced sacropelvic chordoma requiring en bloc total sacrectomy and rectal resection. The mean tumor size was 2,139 cm3, and the soft tissue defect 13920 cm3. Patients underwent pelvic instrumentation with hardware and fibular grafts (1 patient bilateral free fibula flap; the other allograft fibular bone) for spine and pelvic reconstruction followed by pedicled Fleur-de-lys flap. The posterior abdominal wall was reconstructed in 1 patient with Alloderm to avoid bowel herniation. One patient developed a minor abdominal wound dehiscence, managed with dressing change, and wound vac. The other patient presented wound infection and minor dehiscence in the abdominal and sacral requiring surgical debridement with successful healing. The mean hospital stay was 74 days (63–85), and the follow-up was 13 months (7–19). One patient expired after 19 months of the initial surgery. CONCLUSION: The Fleur-de-lys myocutaneous flap obliterates massive soft tissue defects resulted from total sacral resections and avoids the need of other flaps with low morbidity associated. REFERENCES: 1. Kreutz-Rodrigues L, Banuelos J, Saleem HY, et al. The use of vertical rectus abdominis myocutaneous flap for pelvic reconstruction: what are the risk factors for complications? Plast Reconstr Surg Glob Open. 2019;7(8 Suppl):75–75. 2. Marshall DR, Ross DA. A Fleur de Lys modification of the TRAM flap for breast reconstruction. Br J Plast Surg. 1994;47:521–526. 3. Anthony JP, Foster RD. The reconstruction of complex thoracic wounds: a fleur-de-lys modification of the rectus abdominis myocutaneous flap. Plast Reconstr Surg. 2001;107:1229–1233.

“Fleur De Lys” Muscle-Aponeurotic Plication in Abdominoplasty and Lipoabdominoplasty

“Fleur De Lys” Muscle-Aponeurotic Plication in Abdominoplasty and Lipoabdominoplasty

Quality of life among adults following body contouring surgery after bariatric surgery: a systematic review protocol

Review question/objective How does body contouring surgery following bariatric surgery influence quality of life among adults? Inclusion criteria Types of participants All adult patients>18 years who have had bariatric surgery and are eligible for body contouring surgery. Typical bariatric procedures include temporary gastric balloon, adjustable gastric banding, sleeve gastrectomy, bilopancreatic diversion, bilopancreatic diversion dudodenial switch modifications, and roux-en-y gastric bypass. Jejunoileal bypass procedure is excluded as it is no longer recommended in Europe and the US due to the unacceptably high morbidity and mortality associated with the procedure. Types of intervention(s)/phenomena of interest Any body contouring surgical procedure including, but not limited to, abdominoplasty (tummy tuck), Fleur de lys abdominoplasty (tummy tuck and liposuction of back and buttocks), apronectomy (mini tummy tuck), mastopexy (breast lift), thigh lift or mini thigh lift, and brachioplasty (arm lift). Eligibility for body contouring surgery includes: a current BMI of less than or equal to 28.0kg/m2, weight stability over 12 months and significant functional disturbances (both physical and psychological) following massive weight loss (from either post bariatric surgery or lifestyle changes). Comparisons will be as follows: 1. Body contouring surgery versus no body contouring. 2. Body contouring surgery: multiple area procedures versus single area procedures. Types of outcomes This review will consider studies that include the following outcome measures: Primary outcome: quality of life as measured by validated tools at 5 years following body contouring surgery. Validated tools may include: pictoral body image assessment (PBIA), body image and satisfaction assessment, current body image assessment, health related quality of life, the post bariatric surgery quality of life survey, Beck's inventory, the Hospital Anxiety and Depression Scale, SF 36, quality of life instrument, body uneasiness test and the Obesity Psychosocial State Questionnaire. Secondary outcomes: adverse events (as reported in the included papers), unsatisfactory aesthetic appearance or weight gain.

Fleur De Lys Abdominoplasty: Techniques to Reduce Complication Rates – Our Experience

Introduction: Standard abdominoplasties are inadequate in addressing gross tissue excess and laxity. The Fleur De Lys technique addresses supraumbilical excess and is ideal for massive weight loss patients. However, many surgeons hold reservations with this technique because of potentially high risk of complication rates. In our experience, it is a safe technique with low complications with regard to wound healing, with a good patient satisfaction rate. Aims: This study illustrates an effective modification of the Fleur De Lys technique by a single surgeon in our unit. We aim to share our experiences on the Fleur De Lys abdominoplasty and techniques to reduce complications. Methodology: We described the senior author’s improvised Fleur De Lys operative technique. We obtained medical illustrations outlining pre-operative assessment and markings, and intra-operative techniques. We also discussed selection criteria. We reviewed complications and satisfaction of 29 patients who had undergone Fleur De Lys in our unit over a 3 year period. Results: Our patient demographic showed as ratio M:F = 1:14, mean age was 39 years, mean pre-operative BMI 26.8 kgm-2 and mean tissue weight excised was 1669 Gm. 17.2% (n=5) had wound breakdown, 6.9% (n=2) developed infection and 6.9% (n=2) had seroma. Only 10.3% (n=3) patients required revision operation. Our patient satisfaction survey showed 27 out of 29 patients had a positive patient satisfaction response. Discussion: The Fleur De Lys abdominoplasty is safe in carefully selected patients. The senior author’s improvisation ‘pinch and reduce by an inch’ technique during pre-operative skin marking placement together with a ‘no undermining’ principle intra-operatively reduces wound edge tension during closure, minimizes risk of skin flap necrosis and reduces potential dead space for fluid collection such as seroma. In our experience, this technique is safe and yields satisfactory results.

The Ball and the Cross, the Fleur de Lys and the English Rose

The Ball and the Cross, the Fleur de Lys and the English Rose

The Fighting Civil Servant: Making Sense of the Canadian Superhero

When Canada Post released a series of five Canadian comic book-based superhero stamps in 1996, it seemed something of a symbolic victory for the otherwise largely marginalized Canadian comics industry. In looking more deeply, however, we see that the five Canadian superheroes chosen--Superman, Johnny Canuck, Nelvana of the Northern Lights, Captain Canuck, and Fleur de Lys--illustrate a set of tensions that surround the intersection of popular culture and federal institutions within Canada. Superman is, of course, the most famous superhero among the five and is best associated with his dedication to truth, justice and the American way, a jingoistic credo that immediately throws his status as a Canadian icon into question. Yet his incorporation into the national superhero mythos appears necessary for several reasons. Superman is included in the set most obviously because he was co-created by the Toronto-born (though Cleveland-raised) Joe Shuster, a connection that has often been used to suggest that the character's heritage is at least half-Canadian. Second, as the first comic book superhero, Superman takes on the role of forefather to the rest of the characters in the set, authorizing them as his symbolic heirs. Indeed, the specific Canadianization of Superman by the stamps serves to legitimize the entire project of Canadian superhero canonization generally. The remaining superheroes recognized by Canada Post are less familiar, though perhaps no less important in the history of efforts to nationalize the superhero icon. Both Johnny Canuck and Nelvana were heroes of the Second World War, and characters that are associated with the brief Golden Age of Canadian comics production. The decision to feature two characters from the same publishing house--both were produced by Bell Features--rather than a more popular wartime character such as Canada Jack can be traced to the fan-initiated processes of rediscovery and rearticulation that surrounded Canadian superheroes in the 1970s. A fourth figure, Captain Canuck, was one of the blatantly nationalistic heroes of the Canadian post-Centennial era of the late 1960s and early 1970s that were influential within comics fandom, albeit short-lived on the newsstands. The inclusion of Fleur de Lys, a supporting character in a little known and short-lived comic book from the mid-1980s, seems to be the most arbitrary inclusion. The fact that the character is Francophone in a genre almost completely associated with English language cultures was probably the key factor in the character's selection, as Canada Post would likely feel an obligation to represent Canadian linguistic duality in the stamp set and, because it developed in a much different cultural context, there are no Quebecois superheroes available to be recognized. Canada Post's choices, therefore, suggest that processes of national mythmaking and regional reconciliation collided with the generally insular culture of English-Canadian comic book fandom in shaping the orientation of the set of commemorative stamps. To understand the process whereby the Canadian comic book industry was repatriated as a part of Canadian nationalism, it is important to consider not only the history of the comic book in Canada but, more importantly, the ways that fan discourses helped to shape the recuperation of the Canadian superhero during its second wave of popularity in the post-Centennial period by distinguishing it from superheroes in the United States. In short, this paper will address the way that various comic book creators and publishers have, at different historical moments, mobilized the cliches of Canadian nationalism in the form of the superhero in order to create for themselves a unique niche in the overall field of superhero comic books. The Nationalist Superhero In his book, Superheroes: A Modern Mythology, Richard Reynolds seeks to identify a number of conventions related to the superhero narrative through reference to various mythical tropes. …

A comparison of microstructural and chemical patterns in garnet from the Fleur de Lys Supergroup, Newfoundland

This study uses compositional analyses of garnet porphyroblasts to test a previously published microstructure-based model of garnet growth in the Fleur de Lys Supergroup. X-ray maps reveal significant compositional anomalies within garnet, including zoning reversals and steepened compositional gradients. These anomalies occur at the margin of the proposed first stage of garnet growth (G 1), and coincide with truncations of inclusion trails and changes in the inclusion assemblage. Intervals of reversed composition zoning and steepened compositional gradients across this boundary are interpreted to represent a hiatus in garnet growth, possibly accompanied by garnet consumption, during which changes in the garnet-forming reaction, P– T conditions and deformation kinematics occurred. The junction of the proposed second and third stages of garnet growth (G 2 and G 3) coincides with the transition between successive crenulation cleavages, without substantial microstructural truncations or changes in the inclusion assemblage. The G 2–G 3 boundary is generally marked by uninterrupted normal zoning, with subtle compositional anomalies in some samples. This boundary may in fact record continuous garnet growth, or alternatively mark a relatively short intra-orogenic pause in garnet growth with minimal affect on zoning patterns. Individual porphyroblasts with contrasting inclusion trail microstructures also have different zoning patterns, and this supports the previous recognition of contrasting growth histories between individual porphyroblasts. A combined structural–metamorphic model is presented that integrates the timing of garnet growth and foliation development, reaction history and the P– T– t path in the Fleur de Lys Supergroup.

Episodic porphyroblast growth in the Fleur de Lys Supergroup, Newfoundland: timing relative to the sequential development of multiple crenulation cleavages

Inclusion trails in garnet and albite porphyroblasts in the Fleur de Lys Supergroup preserve successive generations of microstructures, some of which correlate with equivalent microstructures in the matrix. Microstructure–porphyroblast relationships provide timing constraints on a succession of seven crenulation cleavages (S1–S7) and five stages of porphyroblast growth. Significant destruction and alteration of early fabrics has occurred during the microstructural development of the rock mass. Garnet porphyroblasts grew episodically through four growth stages (G1–G4) and preserve a succession of five fabrics (S1–S5) as inclusion trails. Garnet growth during each of the four growth phases did not occur on all pre‐existing porphyroblasts, resulting in contrasting growth histories between individual garnet porphyroblasts from the same outcrop. Albite porphyroblasts grew during a single stage of growth and have overgrown microstructures continuous with the matrix. The garnet and albite porphyroblast inclusion trails record a succession of crenulation cleavages without any rotation of the porphyroblasts relative to other porphyroblasts in the population.Complex microstructural histories are best resolved by preparing multiple oriented thin sections from a large number of samples of different rock types within the area of study. The succession of matrix foliations must be understood, as it provides the most useful time‐frame against which to measure the relative timing of phases of porphyroblast growth. Comparable microstructures must be identified in different porphyroblasts and in the rock matrix.

Nationalism: Five Roads to Modernity.

Introduction 1. God's Firstborn: England Reflection of the National Consciousness in Discourse and Sentiment The New Aristocracy, the New Monarchy, and the Protestant Reformation The English Bible, the Bloody Regiment of Queen Mary, and the Burning Matter of Dignity England as God's Peculiar People, and the Token of His Love The Sound of Their Voices The Changing Position of the Crown and Religion in the National Consciousness A Land of Experimental Knowledge 2. The Three Identities of France I. The Development of Pre-National French Identity France--a Church, and the Faith of the Fleur de Lys Heresy and Its Child The King and His State II. The Social Bases of the Nationalization of French Identity and the Character of the Nascent National Consciousness Turns of the Social Wheel: The Plight of the French Aristocracy The Perilous Escape: Redefinition and Reorganization of the Noblesse The Birth of the French Nation Nation, the Supreme Being Competition with England and Ressentiment A Note on Non-Elite Nationalism 3. The Scythian Rome: Russia Perestroika in the Eighteenth Century The Crisis of the Nobility The West and Ressentiment The Laying of the Foundations Transvaluation of Values: The Crystallization of the Matrix of Russian Nationalism The Two-Headed Eagle 4. The Final Solution of Infinite Longing: Germany I. The Setting The Conception and Miscarriage of Nationalism in the Sixteenth Century The Early Evolution of the Concept of the State The Insouciance of German Nobility prior to the Nineteenth Century Bildungsburgertum: The Dangerous Class II. The Birth of the Spirit: The Preparation of the Mold for the German National Consciousness Aufklarung Pietism Romanticism III. The Materialization of the Spirit The Impact of the French Revolution The Birth of German Nationalism The Finishing Touch: Ressentiment The Twin Blossoms of the Blue Flower 5. In Pursuit of the Ideal Nation: The Unfolding of Nationality in America America as a New England The Separation A Union Begun by Necessity The Tug-of-War: The Persisting Threat of Secession and the Development of National Unity Inconsistencies and Tensions The Trial and Completion of American Nationality Afterword Notes Index

Decompression‐induced growth of albite porphyroblasts, Fleur de Lys Supergroup, western Newfoundland

Abstract Albite porphyroblasts are widely distributed in pelitic and semi‐pelitic schists of the Fleur de Lys Supergroup, western Newfoundland. Textures and mineral assemblages indicate that albite grew during nearly isothermal decompression from P‐T conditions of about 500° C, 9 kbar, to conditions of 550° C, 6.5 kbar. Three compositional varieties of albite‐bearing schists, here termed PMAQ (paragonite‐muscovite‐albite‐quartz), MMAQ (microcline‐muscovite‐albite‐quartz), and PMMQ (paragonite‐muscovite‐margarite‐quartz), can be distinguished on the basis of pre‐porphyroblast mineral assemblages. Analysis of these assemblages in terms of the composition of the coexisting fluid [log a(Na+/H+) versus log a(K+/H+)] suggests that, as pressure and temperature changed, the stability field of albite expanded at the expense of coexisting matrix phyllosilicates. This promoted growth of albite on pre‐existing or newly formed nuclei. Late oligoclase in PMAQ and PMMQ samples is associated with replacement of matrix garnet by plagioclase + mica ° Chlorite, particularly in strongly sheared samples.

Metamorphism of an Early Palaeozoic continental margin, western Baie Verte Peninsula, Newfoundland

Metamorphic mineral assemblages and textures from Early Palaeozoic continental margin rocks in north‐western Newfoundland indicate that different structural levels have contrasting metamorphic histories. Rocks of the East Pond Metamorphic Suite, which represent the older, structurally lower level of the margin, experienced an early high‐pressure–low‐temperature stage of metamorphism (10–12 kbar minimum, 450–500°C) which produced eclogite in mafic dykes and phengite–garnet assemblages in pelites. This was overprinted by higher temperature–lower pressure amphibolite facies metamorphism (700–750°C, 7–9 kbar minimum) which produced complex symplectic textures in rocks of all compositions. Rocks of the Fleur de Lys Supergroup, which were deposited in the stratigraphically higher levels of the rifted margin, reached pressures of 7–8.5 kbar at about 450°C during the early stages of metamorphism, overprinted by assemblages which indicate maximum temperatures of 550–600°C at about 6.5 kbar. The metamorphic history of both units is interpreted to be the result of thermal relaxation following initial burial of a continental margin by overriding thrust sheets. Since there is no evidence that maximum pressures or temperatures within the Fleur de Lys Supergroup were ever as high as those reached in the East Pond Metamorphic Suite, these rocks may have followed parallel, ‘nested’P–T–t paths, with the more deeply buried East Pond Metamorphic Suite subjected to greater thermal relaxation effects. Quantitative modelling of P–T–t paths is not possible with the present data, owing to both large uncertainties in P–T estimates, and in the time of metamorphism.

Geology, geochemistry and geochronology of a taconic batholith, southwestern Newfoundland

ABSTRACTFoliated to massive hornblende and biotite-bearing tonalite, trondhjemite and granodiorite comprise a terrane of batholithic dimensions in southwestern to central Newfoundland. These rocks intrude and include Ordovician ophiolite fragments and metasedimentary rocks of Fleur de Lys type, and are cut by a suite of Silurian gabbro-diorite and norite and Siluro-Devonian (?) granite intrusions.A U/Pb (zircon, sphene) age of 456 ± 3 Ma (2σ) and a K/Ar (hornblende) age of 455 ± 14 Ma (previously reported) for a representative least-deformed tonalite of the Southwest Brook Complex indicate that it crystallised and cooled in Caradoc time. A less precise U/Pb (zircon) age of 428 ± 41 Ma (2σ) is measured for tonalitic Cape Ray Granite in southern Newfoundland. On discrimination diagrams which use Rb, Nb and Y contents to infer tectonic setting, these rocks fall in the field of volcanic arc granites. The occurrence of zircon cores with average ages of 1430 + 18/–17 and 1541 ± 173 Ma (2σ) also indicate that the magmas formed in part by partial melting of Proterozoic crust, or sediments derived from such crust. It is suggested that the tonalitic magmas were generated during the Taconic Orogeny in an arc: continent collision zone at the ancient margin of eastern North America.Tonalitic rocks in western Newfoundland broadly correlative in age and chemistry with the batholith include the Burlington Granodiorite and Hungry Mountain Complex, as well as allochthonous slices of foliated tonalite emplaced over Ordovician platform carbonates W of Grand Lake.

Strain-induced mineral growth in ductile shear zones and a preliminary study of ductile shearing in western Newfoundland

In the Fleur de Lys and the Central Gneiss terranes the presence of strain-induced mineral growth characteristic of ductile shear zones within zones of rocks with mylonitic fabrics indicates the existence of major belts of layer-parallel ductile shearing with complex evolutionary sequences. Kinematic markers in several of these shear belts indicate that shearing movements on initially probably gently inclined surfaces, directed not normal to the axial trend of the orogen but parallel to it, are tectonically important in western Newfoundland. The shear belts are in excess of 1 km thick, and one well-exposed example exhibits a pattern in which zones of the highest strain anastomose on the map scale.The base of the Fleur de Lys Supergroup is marked by one such major zone of shearing (décollement) in which kinematic indicators record movements directed to the north and to the south, before the regional attitude of the rocks was steepened. Along the Baie Verte Line, earlier north- and south-directed movements in the Fleur de Lys were succeeded by reverse movements towards the east, over the Dunnage Terrane.

Timing of porphyroblast growth in the Fleur de Lys Supergroup, Newfoundland

Abstract In the Fleur de Lys Supergroup, western Newfoundland, inclusion trails in garnet and albite porphyroblasts indicate that porphyroblasts overgrew a crenulation foliation, without rotation, probably during the deformation event that produced the crenulations. Further deformation of the matrix resulted in strong re‐orientation and retrograde metamorphism of the matrix foliation, which is consequently highly oblique to the crenulation foliation preserved in the porphyroblasts. The resulting matrix foliation locally preserves relics of the early crenulations, and also has itself been crenulated later in places. Thus the porphyroblasts grew before the later stages of deformation, rather than during the final stage, as had been suggested previously. The new interpretation is consistent with available 40Ar/39Ar cooling ages which indicate a late Ordovician‐early Silurian metamorphic peak, rather than the Devonian peak suggested by previous workers. The inclusion patterns and microprobe data indicate normal outward growth of garnet porphyroblasts from a central nucleus, rather than as a series of veins as proposed by de Wit (1976a, b). However, the observations presented here support growth of porphyroblasts without rotation, which is implied by the de Wit model.

Significance of the Baie Verte Flexure, Newfoundland

The Baie Verte Flexure is a regional structure defined by the change in trends of early Paleozoic rocks of the Baie Verte Peninsula, Newfoundland. The flexure affects all major geological elements on the peninsula, including the Baie Verte Line, a fundamental polygenetic structural zone that juxtaposes continental polydeformed metaclastic rocks of the Fleur de Lys Supergroup, to the west, against inhomogeneously deformed ophiolites and volcanic rocks to the east. The tectonic history of both sequences has been a major point of contention in northern Appalachian geology; recognition of the flexure resolves this problem. Central to this problem has been the geological setting of an apparently isolated sequence of metaclastic rocks, the Ming9s Bight Group, that occurs in the midst of the ophiolite-volcanic terrane. Previous workers have assumed that the group, which is lithically and structurally similar to parts of the Fleur de Lys, is conformable with the adjacent ophiolitic-volcanic terrane. Delineation of features along the flexure clarifies the stratigraphic and structural relationships of the group. In particular, recognition of a continuous belt of Fleur de Lys rocks that wraps around the northern portion of the peninsula indicates that the Ming9s Bight Group forms part of the supergroup; in addition, the tracing of the Baie Verte Line around the flexure shows that the group is tectonically severed from the ophiolitic-volcanic terrane. The polydeformation of the Fleur de Lys rocks and northerly parts of the ophiolitic-volcanic terrane appears to have been inhomogeneous. Regional relationships and recent Ar 40 / Ar 39 ages indicate that rocks of the main Fleur de Lys outcrop belt were deformed mainly during the Taconic, whereas the Ming9s Bight Group and parts of the ophiolitic-volcanic terrane were affected by an Acadian event. This can be explained by two separate, noncoaxial events acting upon some pre-existing manifestation of the flexure, probably the irregular margin of the ancient continent. Relationships along the Baie Verte Flexure may reflect inherent complexities of larger flexures, salients, and recesses of the Appalachian Orogen and may be important to interpretation throughout the orogen.

Structural and metamorphic relationships of pre-Fleur de Lys and Fleur de Lys rocks of the Baie Verte Peninsula, Newfoundland

A variable assemblage of remobilized and recrystaltized granites and supracrustal rocks, formerly regarded as metasediments within the stratigraphic succession of the Eocambrian – Early Paleozoic western division of the Fleur de Lys Supergroup, have been recognized to constitute a basement to the Fleur de Lys metasediments. The basement rocks are exposed in (1} a central domal complex and (2) tectonic inliers within the Fleur de Lys metasediments (the cover) as modified isoclinal anticlines. Both the basement and the cover have undergone intense Lower Paleozoic deformation and lower-amphibolite faciès metamorphism.There is a marked petrographic distinction between rocks from the basement and those from the cover. Textures from the latter tend to conform with generally accepted equilibrium textures. Porphyroblastic habit of index minerals is a rule. In contrast, textures from the recrystallized basement rocks are of disequilibrium type, manifested by poikiloblasts and symplectites which have relatively large surface areas. Dendritic, myrmititic, and widmanstatten-like textures are common. Only where fully reconstituted to schists within zones of intense deformation do textures in the basement rocks resemble those in the cover.Tholeiitic dykes, that cut both cover and basement prior to the tectono-metamorphic events, have recrystallized to eclogite – garnet amphibolite assemblages in the basement. These also display the disequilibrium textures. In the cover, the dykes recrystallized to plagiociase amphibolites with equilibrium and porphyroblastic textures. From this it is argued that progressive metamorphism of the cover rocks and retrogressive metamorphism of the basement rocks occurred under similar P–T conditions and that the variable petrography of the basement and cover rock assemblages merely reflects different nucleation and growth kinetics related to relative "dry" and "wet" conditions respectively. The formation of textures within the "dry" basement was kinetically controlled and their morphologies are compatible with those formed by exsolution reaction mechanisms in alloys.

Ophiolitic detritus in the Upper Ordovician flysch of Notre Dame Bay and its bearing on the tectonic evolution of western Newfoundland

Samples from the Upper Ordovician graywacke-shale sequence in western Notre Dame Bay, Newfoundland, contain trace quantities of detrital chromite. The age and provenance of these sedimentary rocks indicate that the chromite was derived from the general area of the ophiolite bodies now exposed in western Newfoundland. These data place a new constraint on tectonic reconstructions of the area for the Ordovician Period. Our analysis of the stratigraphy in Notre Dame Bay, together with recently published isotopic dates for both the Eastern Fleur de Lys terrane and Notre Dame Bay area is compatible with the hypothesis that ophiolite obduction in western Newfoundland resulted from the collision of an island arc with a passive continental margin during Middle Ordovician time.

Eclogite-Bearing Amphibolous from the Appalachian Mobile Belt, Northwest Newfoundland: Dry versus Wet Metamorphism: A Discussion

Previous articleNext article No AccessDiscussion and ReplyEclogite-Bearing Amphibolous from the Appalachian Mobile Belt, Northwest Newfoundland: Dry versus Wet Metamorphism: A DiscussionW. R. ChurchW. R. Church Search for more articles by this author PDFPDF PLUS Add to favoritesDownload CitationTrack CitationsPermissionsReprints Share onFacebookTwitterLinkedInRedditEmail SectionsMoreDetailsFiguresReferencesCited by The Journal of Geology Volume 86, Number 5Sep., 1978 Article DOIhttps://doi.org/10.1086/649731 Views: 2Total views on this site Citations: 1Citations are reported from Crossref Copyright 1978 University of ChicagoPDF download Crossref reports the following articles citing this article: Discussion on a high precision U-Pb age for the Ben Vuirich granite: implications for the evolution of the Scottish Dalradian Supergroup, Journal of the Geological Society 148, no.11 (Jan 1991): 205–206.https://doi.org/10.1144/gsjgs.148.1.0205

U–Pb ages of some crystalline rocks from the Burlington Peninsula, Newfoundland, and implications for the age of Fleur de Lys metamorphism: Reply

U–Pb ages of some crystalline rocks from the Burlington Peninsula, Newfoundland, and implications for the age of Fleur de Lys metamorphism: Reply