DOI: 10.1016/j.palaeo.2013.02.012
论文题名: Opening of a trans-Pangaean marine corridor during the Early Jurassic: Insights from osmium isotopes across the Sinemurian-Pliensbachian GSSP, Robin Hood's Bay, UK
作者: Porter S.J. ; Selby D. ; Suzuki K. ; Gröcke D.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2013
卷: 375 起始页码: 50
结束页码: 58
语种: 英语
英文关键词: Hispanic Corridor
; Ocean connectivity
; Organic-rich sediments
; Osmium isotopes
; Sinemurian-Pliensbachian
英文摘要: The Hispanic Corridor represents a significant phase of continental reorganisation of the Early Jurassic that eventually provided connectivity between the western Tethyan and eastern Pacific oceans along the Central Atlantic rift zone. Although the initiation of this marine corridor profoundly impacted oceanic circulation and marine faunal exchange patterns, the timing of its formation hitherto remains poorly constrained with estimates spanning both the Hettangian and Sinemurian.The Sinemurian-Pliensbachian Global Stratotype Section and Point (GSSP) at Robin Hood's Bay, UK, comprises a succession of well-exposed, immature organic-rich sediments, only previously characterised by strontium, oxygen and carbon isotope geochemistry. New Re and Os isotope profiling indicates substantial variation in seawater chemistry at this time. Initial osmium isotope data become increasing unradiogenic (0.40 to 0.20) across the boundary, providing evidence for a continual flux of unradiogenic Os into the oceans during the latest Sinemurian. The initial unradiogenic 187Os/188Os values indicate the occurrence of low-temperature hydrothermal activity associated with the formation of the Hispanic Corridor during the breakup of Pangaea. Therefore, combined with biogeography and faunal exchange patterns, the Os isotope data demonstrates that connectivity between the Eastern Pacific and Tethyan oceans initiated during the latest Sinemurian. As a result this study better constrains the timing of establishment of the Hispanic Corridor, which was previously limited to poorly defined biogeography. © 2013 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/69777
Appears in Collections: 过去全球变化的重建
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作者单位: Department of Earth Sciences, Durham University, Durham, DH1 3LE, United Kingdom; Japan-Agency for Marine-Earth Science and Technology, Yokosuka 237-0061, Japan
Recommended Citation:
Porter S.J.,Selby D.,Suzuki K.,et al. Opening of a trans-Pangaean marine corridor during the Early Jurassic: Insights from osmium isotopes across the Sinemurian-Pliensbachian GSSP, Robin Hood's Bay, UK[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2013-01-01,375