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An Upper Jurassic methane-seep limestone from the Fossil Bluff Group forearc basin of Alexander Island, Antarctica

Simon R. A. Kelly, Peter W. Ditchfield, Paul A. Doubleday and James D. Marshall
An Upper Jurassic methane-seep limestone from the Fossil Bluff Group forearc basin of Alexander Island, Antarctica
Journal of Sedimentary Research, Section A: Sedimentary Petrology and Processes (April 1995) 65 (2): 274-282

Abstract

An anomalous Upper Jurassic limestone bed, 3 m thick, is present within the volcaniclastic infill of a forearc basin, exposed on Alexander Island, Antarctica. The limestone, formally designated the Gateway Pass Limestone Bed, contains laminated crusts and blocks, including hardgrounds, showing radial-fibrous and botryoidal calcite cements. Carbon isotope values are very negative (delta (super 13) C of -33.5 per thousand to -44.6 per thousand PDB) indicating a methane-oxidation origin for the carbonate. The limestone bed formed around a submarine cold seep in the Antarctic Peninsula forearc basin adjacent to the accretionary prism. In contrast to adjacent nearly barren sea floor the limestone also yields a "benthic island" assemblage containing abundant gastropods and bivalves. The seep is directly comparable to certain Jurassic seeps at the convergent margin of the northeast Pacific, and both are related to subduction at the eastern proto-Pacific margin.


ISSN: 1073-130X
Serial Title: Journal of Sedimentary Research, Section A: Sedimentary Petrology and Processes
Serial Volume: 65
Serial Issue: 2
Title: An Upper Jurassic methane-seep limestone from the Fossil Bluff Group forearc basin of Alexander Island, Antarctica
Affiliation: British Antarctic Survey, Natural Environment Research Council, Cambridge, United Kingdom
Pages: 274-282
Published: 19950403
Text Language: English
Publisher: Society of Economic Paleontologists and Mineralogists, Tulsa, OK, United States
References: 48
Accession Number: 1995-039857
Categories: Sedimentary petrologyIsotope geochemistry
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. block diag., sketch maps
S72°30'00" - S68°40'00", W75°40'00" - W62°00'00"
Secondary Affiliation: University of Cambridge, GBR, United KingdomUniversity of Liverpool, GBR, United Kingdom
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute.
Update Code: 199515
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