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New constraints on the sedimentation and uplift history of the Andaman-Nicobar accretionary prism, South Andaman Island

By
R. Allen
R. Allen
Department of Environmental Science, Lancaster University LA1 4YQ, UK
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A. Carter
A. Carter
Research School of Earth Sciences, Birkbeck and University College London, Gower St., London WC1E 6BT, UK
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Y. Najman
Y. Najman
Department of Environmental Science, Lancaster University LA1 4YQ, UK
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P.C. Bandopadhyay
P.C. Bandopadhyay
Geological Survey of India, Geodata Division, Salt Lake, Kolkata, 91, India
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H.J. Chapman
H.J. Chapman
Department of Earth Sciences, Cambridge University, Downing St., Cambridge CB2 3EQ, UK
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M.J. Bickle
M.J. Bickle
Department of Earth Sciences, Cambridge University, Downing St., Cambridge CB2 3EQ, UK
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E. Garzanti
E. Garzanti
Dipartimento di Scienze Geologiche e Geotecnologie, Universita Milano-Bicocca, Piazza della Scienza 4, 20126 Milano, Italy
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G. Vezzoli
G. Vezzoli
Dipartimento di Scienze Geologiche e Geotecnologie, Universita Milano-Bicocca, Piazza della Scienza 4, 20126 Milano, Italy
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S. Andò
S. Andò
Dipartimento di Scienze Geologiche e Geotecnologie, Universita Milano-Bicocca, Piazza della Scienza 4, 20126 Milano, Italy
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G.L. Foster
G.L. Foster
Department of Earth Sciences, Bristol University, Queens Rd., Bristol BS8 1RJ, UK
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C. Gerring
C. Gerring
Department of Earth Sciences, The Open University, Walton Hall, Milton Keynes MK7 6AA, UK
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Published:
January 01, 2008

The Andaman Islands are part of the Andaman-Nicobar Ridge, an accretionary complex that forms part of the outer-arc ridge of the Sunda subduction zone. The Tertiary rocks exposed on the Andaman Islands preserve a record of the tectonic evolution of the surrounding region, including the evolution and closure of the Tethys Ocean. Some of the Paleogene sediments on Andaman may represent an offscraped part of the early Bengal Fan. Through field and petrographic observations, and use of a number of isotopic tracers, new age and provenance constraints are placed on the key Paleogene formations exposed on South Andaman. A paucity of biostratigraphic data poorly define sediment depositional ages. Constraints on timing of deposition obtained by dating detrital minerals for the Mithakhari Group indicate sedimentation after 60 Ma, possibly younger than 40 Ma. A better constraint is obtained for the Andaman Flysch Formation, which was deposited between 30 and 20 Ma, based on Ar-Ar ages of the youngest detrital muscovites at ca. 30 Ma and thermal history modeling of apatite fission-track and U-Th/He data. The latter record sediment burial and inversion (uplift) at ca. 20 Ma. In terms of sediment sources the Mithakhari Group shows a predominantly arc-derived composition, with a very subordinate contribution from the continental margin to the east of the arc. The Oligocene Andaman Flysch at Corbyn's Cove is dominated by recycled orogenic sources, but it also contains a subordinate arc-derived contribution. It is likely that the sources of the Andaman Flysch included rocks from Myanmar affected by India-Asia collision. Any contribution of material from the nascent Himalayas must have been minor. Nd isotope data discount any major input from cratonic Greater India sources.

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Contents

GSA Special Papers

Formation and Applications of the Sedimentary Record in Arc Collision Zones

Amy E. Draut
Amy E. Draut
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Peter. D. Clift
Peter. D. Clift
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David W. Scholl
David W. Scholl
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Geological Society of America
Volume
436
ISBN print:
9780813724362
Publication date:
January 01, 2008

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