DOI: 10.1016/j.palaeo.2013.03.001
论文题名: Glendonites from an Early Jurassic methane seep - Climate or methane indicators?
作者: Teichert B.M.A. ; Luppold F.W.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2013
卷: 390 起始页码: 81
结束页码: 93
语种: 英语
英文关键词: Cold seep
; Early Jurassic
; Glendonite
; Methane
; Pliensbachian
; Stable isotopes
英文摘要: An Early Jurassic, Late Pliensbachian section (margaritatus to spinatum ammonite Zone) northeast of Cremlingen, Germany, revealed three horizons with abundant glendonites, calcite pseudomorphs after ikaite (CaCO3·6H2O), as well as authigenic carbonates. These pseudomorphs have previously been used as indicators for organic- and phosphate-rich paleoenvironments with near-freezing bottom water temperatures. Stable isotope measurements clearly show that the ikaite/glendonite was precipitated at a methane seep location with methanotrophic sulfate reduction as the triggering geochemical process for ikaite formation at the sulfate-methane interface. The termination of methane seepage probably led to the disintegration of the primary mineral ikaite and successive pseudomorph formation. Reconstructed paleo bottom water temperatures (ca. 10°C) from belemnites and ostracods indicate temperatures well above the previously observed range of ikaite stability (near freezing), raising the question if methane seeps are distinct geochemical sites promoting ikaite formation at higher temperatures. © 2013 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/69589
Appears in Collections: 过去全球变化的重建
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作者单位: Institut für Geologie und Paläontologie, Universität Münster, Corrensstr. 24, 48149 Münster, Germany; Landesamt für Bergbau, Energie und Geologie, Stilleweg 2, 30655 Hannover, Germany
Recommended Citation:
Teichert B.M.A.,Luppold F.W.. Glendonites from an Early Jurassic methane seep - Climate or methane indicators?[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2013-01-01,390