Abstract
Cretaceous statistical palynology of the Austral Basin, Continental Platform, Argentina. II. Six wells of the Gallegos Area. III. Discussion and conclusions. A statistical study of palynomorph groups found in six offshore wells of the Gallegos Area in the Austral Basin is here presented. All samples are sidewall cores. The same groups analyzed in the first part were considered, including the ratio marine/continental palynomorphs and pteridophytes/gymnosperms/ angiosperms. Percentages of all groups are presented for the six wells and their significance is analyzed. Pollen assemblages of these wells are uniform in their taxonomic composition. The main parameters of the most relevant sections from all studied wells, including one onshore well of the same area that provided useful information in the past, were selected. Ages based on similarity with known pollen assemblages from the same basin, as well as recent data provided by microplankton and radiometric studies are given. It is concluded that during the time span recorded - basal Cretaceous to early-Aptian- two transgressive episodes occurred. A sequence of plant assemblages is characterized and the main compositional changes of vegetation are discussed. Finally, correlations with known palynological assemblages from other areas of the Austral Basin are made. Key words: Stat i st ical palynology, Cretaceous, s t rat igr aphy, Aus t ral Basin, of f shore, Argent ina.
Highlights
P',couas Cound in six offshore wells of the Galle.~osArea iii Lhe Austral Basin is here ~ resente dA. ll samules are sideu,all cores
The same groups analyzed in the first part were considered, including the ratio marinelcontinentat paiynoinorphs and pteridophytes/gymnosperms/ angiosperms
Percentages of all groups are preserited for the six wells and their sienificance is analvzed
Summary
Los grupos considerados son 10s misnios dc la primera contribuciiin, a saber:. E = esporas (Pteridofitas y Briofieas) Ci = esporas cicatricosas Las pteridofitas (HI dominan solo en la basc (73%) y sc retraeii a valores que oscilan entre 28% y 33% en el resto de la coluiuma. Hay un solo registro de A en el nivel 1190m.Todos 10sniveles presentan microplaneton marina, con valores bajos en el scctor inferior (2%4%), y 1118s altos en el superior (10% y 25%). Obs. El sector basal del pozo tiene similitnd aumenta a su mayor valor (56%) a 10s 1223m, de comportamiento de todas las curvas con el para disminuir paulatinamente hasta un 22% en secLor medio del pozo GOC-5 (1247.7-1254.5m). Los 1218m, llega a1 miximo de 38% a 10s 1205.5m y otros grupos tienen valores bajos, entre 0% y 8% culmina con 15% e n el tope. Ci,Ca,Cy tiedades 1230m y 1203m E tiene 30% en la base y nen valores bajos qile oscilan entre 0% y 7% en toda. Dos aspoctos merecen ser analiaados en este contoxto: las irigresiones marinas (que en la Fig. 8 se expresan en la coiunina M) y la secuencia paleofloristica
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