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| Content Provider | Springer Nature Link |
|---|---|
| Author | Herbig, Hans Georg Korn, Dieter Mestermann, Bernd |
| Copyright Year | 1971 |
| Abstract | The basal Vale Figueira Member, upper Murração Formation (Late Viséan), is a shaly succession with intercalated limestone beds bearing a mostly pelagic fauna. It has been deposited on an open marine, deep platform in the most external part of the South Portuguese Zone. Striking lithofacies analogies to the time-equivalent Kieselige Übergangsschichten from the starved basin realm of the Rhenohercynian Zone of Germany indicate eustatic sea level variations as the predominant common factor controlling lithofacies development. The obviously glacioeustatic controlled late Asbian third-order transgression and the succeeding basal Brigantian regression can be elucidated by a sequence stratigraphic approach. The impact of the transgression and associated paleoclimatical and paleooceanographical processes in the deeper water environments are seen by repeated oxygen starvation. Maximum flooding is recorded in the unique deposition of a thin, ammonoid-rich, auttchthonous deep-water limestone, thecrenistria horizon. Several interplaying factors of micrite formation and pelagic mass mortalities are discussed. This event, calledcrenistria event is recorded in different deeper water facies all across the Rhenohercynian Zone in Portugal, southwestern England and Germany, and in adjoining parts of the Belgian Carboniferous Limestone platform. Homologous limestones most probably mark further maximum flooding horizons in Devonian and Carboniferous deeper water settings.The latest Asbian sea level highstand coincided with the short lasting introduction of a cosmopolitan goniatite fauna, which continued into the lowstand systems tract at the Asbian-Brigantian transition. The lowstand is indicated by gravitatively reworked sediments. Proliferation of advanced goniatites of the family Goniatitidae marks the onset of the transgressive systems tract in the basal Brigantian. |
| Starting Page | 183 |
| Ending Page | 195 |
| Page Count | 13 |
| File Format | |
| ISSN | 01729179 |
| Journal | Facies |
| Volume Number | 41 |
| Issue Number | 1 |
| e-ISSN | 16124820 |
| Language | English |
| Publisher | Springer Berlin Heidelberg |
| Publisher Date | 1999-12-01 |
| Publisher Place | Berlin, Heidelberg |
| Access Restriction | One Nation One Subscription (ONOS) |
| Subject Keyword | Deep-Water Facies Micriteformation Sequence Stratigraphy Gonia Tites Asbian-Brigantian Boundary Portugal (South Portuguesezone) Germany (Rhenohercynian Zone) Carboniferous (Viséan) Sedimentology Biogeosciences Geochemistry Paleontology Ecology |
| Content Type | Text |
| Resource Type | Article |
| Subject | Geology Stratigraphy Paleontology |
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