Correlation between deformation lamellae, microfractures, macrofractures, and in situ stress measurements, White River Uplift, Colorado

Abstract

Research Article| January 01, 1981 Correlation between deformation lamellae, microfractures, macrofractures, and in situ stress measurements, White River Uplift, Colorado WILLIAM F. DULA, JR. WILLIAM F. DULA, JR. 1Department of Geology, University of Colorado, Boulder, Colorado 80309 Search for other works by this author on: GSW Google Scholar Author and Article Information WILLIAM F. DULA, JR. 1Department of Geology, University of Colorado, Boulder, Colorado 80309 Publisher: Geological Society of America First Online: 01 Jun 2017 Online ISSN: 1943-2674 Print ISSN: 0016-7606 Geological Society of America GSA Bulletin (1981) 92 (1): 37–46. https://doi.org/10.1130/0016-7606(1981)92<37:CBDLMM>2.0.CO;2 Article history First Online: 01 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation WILLIAM F. DULA; Correlation between deformation lamellae, microfractures, macrofractures, and in situ stress measurements, White River Uplift, Colorado. GSA Bulletin 1981;; 92 (1): 37–46. doi: https://doi.org/10.1130/0016-7606(1981)92<37:CBDLMM>2.0.CO;2 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGSA Bulletin Search Advanced Search Abstract Dynamic analyses of quartz deformation lamellae and microfractures in lower Paleozoic quartzites from the White River Uplift record a northwest direction of compression which can be related to joint and fault orientations and in situ stress determinations. Crystallographic orientations of deformation lamellae resemble those formed in the subbasal I, relatively nonselective domain.Microfractures in quartz grains form orthogonal sets of generally north-northeast– and west-northwest–trending fracutres which are approximately normal to bedding. The strongest set of microfractures in most samples lies in the σ – σ2 plane deduced from deformation lamellae analyses, suggesting that the microfractures are extensional features. Maxima of microfractures correspond to maxima of joints measured at adjacent locations. The strikes of prominent west-northwest sets of microfractures and joints are subparellel to the dominant northwest strike of faults on the uplift.In situ stress measurements conducted in the Piceance Basin and Rangely, Colorado, areas indicate principal stress orientations similar to those determined from quartz deformation lamellae, microfractures, and joints which are pre-uplift to early uplift, late Laramide fabric elements. First Page Preview Close Modal You do not have access to this content, please speak to your institutional administrator if you feel you should have access.