globalchange  > 过去全球变化的重建
DOI: 10.1016/j.palaeo.2012.11.020
论文题名:
Outcrop analogues of pockmarks and associated methane-seep carbonates: A case study from the Lower Cretaceous (Albian) of the Basque-Cantabrian Basin, western Pyrenees
作者: Agirrezabala L.M.; Kiel S.; Blumenberg M.; Schäfer N.; Reitner J.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2013
卷: 390
起始页码: 94
结束页码: 115
语种: 英语
英文关键词: Biomarker ; Fossil biota ; Lower Cretaceous ; Methane-seep carbonate ; Outcrop analogue ; Paleo-pockmark
英文摘要: Late Albian deep-water sediments of the Black Flysch Group in the Basque-Cantabrian Basin (western Pyrenees) preserve a fossil pockmark field including methane seep carbonates and associated macrofauna. The geometry of the pockmarks is reconstructed from repeated lens-shaped turbidite deposits with centrally located carbonate bodies. Early diagenetic carbonate phases such as clotted micrite and yellow calcite with 13C values as low as -41.6‰, and hydrocarbon biomarkers (e.g. 2,6,10,15,19-pentamethylicosane) with strong depletions in 13C indicate that the carbonates precipitated due to anaerobic oxidation of methane. The pockmarks probably formed due to subsidence induced by dewatering and degassing of the gas-charged seabed perhaps enhanced by the weight of the carbonate bodies. The macrofauna resembles that of other late Mesozoic deep-water methane-seeps world-wide, and is dominated by large lucinid and Caspiconcha bivalves, and hokkaidoconchid gastropods. During late diagenesis the carbonate 18O values were reset to a narrow range of -12 to -10‰, the remaining pore spaces and fissures were filled with pyrobitumen, and additional carbonate phases precipitated, potentially due to thermochemical sulfate reduction processes. © 2012 Elsevier B.V..
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/69593
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作者单位: Estratigrafia eta Paleontologia Saila, Euskal Herriko Unibertsitatea UPV/EHU, 644 P.K., 48080 Bilbo, The Basque Country, Spain; Georg-August University, Göttingen Geoscience Center, Geobiology Group, Goldschmidtstr. 3, 37077 Göttingen, Germany

Recommended Citation:
Agirrezabala L.M.,Kiel S.,Blumenberg M.,et al. Outcrop analogues of pockmarks and associated methane-seep carbonates: A case study from the Lower Cretaceous (Albian) of the Basque-Cantabrian Basin, western Pyrenees[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2013-01-01,390
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