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| Format: | Artículo científico |
| Language: | en |
| Published: |
Universitat de Barcelona
2005
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| Online Access: | https://www.redalyc.org/articulo.oa?id=50530211 |
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Table of Contents:
- Influence of a biohermal belt on the lacustrine sedimentation of the Cañadón Asfalto Formation (Upper Jurassic, Chubut province, Southern Argentina) N.G. Cabaleri C. Armella Ciencias de la Tierra Argentina Upper Jurassic Lacustrine Biohermal Belt Cañadón Asfalto Formation The Upper Jurassic Cañadón Asfalto Formation (Cañadón Asfalto Basin, Patagonia Argentina), consistsmainly of carbonate deposits accumulated in hydrologically closed lakes, which were especially sensitive torainfall changes. The lacustrine carbonate sedimentation also interplayed with volcanic episodes recorded bytuffs and lavas, as observed in different basin sectors. These lakes probably underwent warm, alternatinghumid-subarid and arid conditions that resulted in spreading and shrinkage cycles of the closed water bodies.In the Cerro Cóndor area, carbonates were deposited as part of a 500 m long and 39 m thick microbial biohermalbody that extended over 5,5 km2, overlying a hard basalt substratum. This bioherm ridge acted as aphysiographic barrier that controlled the sedimentation in the surrounding lacustrine zones, whose environmentsranged from shallow and deep littoral to eulittoral (including microbial patch reefs) and palustrine. Ahydrologically isolated portion of the lacustrine basin evolved into a pan lake where widespread carbonateevaporitesequences developed. 2005 artículo científico 1695-6133 https://www.redalyc.org/articulo.oa?id=50530211 en http://www.redalyc.org/revista.oa?id=505 Geologica Acta: an international earth science journal application/pdf Universitat de Barcelona Geologica Acta: an international earth science journal (España) Num.2 Vol.3