A LATE DEVONIAN HYDROCARBON-SEEP DEPOSIT DOMINATED BY DIMERELLOID BRACHIOPODS, MOROCCO
| Autor: | Otto H. Walliser, Kathleen A. Campbell, Joachim Reitner, Jörn Peckmann |
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| Rok vydání: | 2007 |
| Předmět: |
010506 paleontology
δ13C Paleontology 010502 geochemistry & geophysics 01 natural sciences Seafloor spreading chemistry.chemical_compound Petroleum seep chemistry Carboniferous Petroleum Carbonate Late Devonian extinction 14. Life underwater Ecology Evolution Behavior and Systematics Geology 0105 earth and related environmental sciences Faunal assemblage |
| Zdroj: | PALAIOS. 22:114-122 |
| ISSN: | 0883-1351 |
| Popis: | A spectacular carbonate deposit from the western Meseta of Morocco consists of microbial and brachiopod limestones. The small, meter-sized Famennian limestone blocks are embedded in Carboniferous shales, implying later displacement. Primary deposition of the limestones apparently occurred below the depth limit of phototrophic organisms. The brachiopods belong to the genus Dzieduszyckia within the rhynchonellide superfamily Dimerelloidea. They occur in fantastic abundance, in a low-diversity faunal assemblage. The microbial limestones contain fossilized threadlike microorganisms of unknown affiliation. The enormous accumulation of brachiopods on the Famennian seafloor is best explained by the former existence of a seep. Crude oil was a major component of the seepage fluids, as indicated by the occurrence of pyrobitumen (metamorphosed petroleum) and δ13Ccarbonate values as low as −12‰, akin to the isotopic composition of carbonates forming at modern oil seeps. The lowest δ13C values in the Dziedusz... |
| Databáze: | OpenAIRE |
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