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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.

Porter, S.J. and Selby, D. and Suzuki, K. and Gröcke, D.R. (2013) '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.', Palaeogeography, palaeoclimatology, palaeoecology., 375 . pp. 50-58.

Abstract

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.

Item Type:Article
Keywords:Osmium isotopes, Hispanic Corridor, Sinemurian–Pliensbachian, Organic-rich sediments, Ocean connectivity.
Full text:(AM) Accepted Manuscript
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Status:Peer-reviewed
Publisher Web site:http://dx.doi.org/10.1016/j.palaeo.2013.02.012
Publisher statement:NOTICE: this is the author’s version of a work that was accepted for publication in Palaeogeography, Palaeoclimatology, Palaeoecology. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Palaeogeography, Palaeoclimatology, Palaeoecology, 375, 1 April 2013, 10.1016/j.palaeo.2013.02.012.
Date accepted:No date available
Date deposited:16 February 2015
Date of first online publication:April 2013
Date first made open access:No date available

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