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Constraints to the timing of India–Eurasia collision; a re-evaluation of evidence from the Indus Basin sedimentary rocks of the Indus–Tsangpo Suture Zone, Ladakh, India

Constraints to the timing of India–Eurasia collision; a re-evaluation of evidence from the Indus Basin sedimentary rocks of the Indus–Tsangpo Suture Zone, Ladakh, India
Constraints to the timing of India–Eurasia collision; a re-evaluation of evidence from the Indus Basin sedimentary rocks of the Indus–Tsangpo Suture Zone, Ladakh, India
Deposited within the Indus–Tsangpo suture zone, the Cenozoic Indus Basin sedimentary rocks have been interpreted to hold evidence that may constrain the timing of India–Eurasia collision, a conclusion challenged by data presented here. The Eurasian derived 50.8–51 Ma Chogdo Formation was previously considered to overlie Indian Plate marine sedimentary rocks in sedimentary contact, thus constraining the timing of collision as having occurred by this time. Using isotopic analysis (U–Pb dating on detrital zircons, Ar–Ar dating on detrital white mica, Sm–Nd analyses on detrital apatite), sandstone and conglomerate petrography, mudstone geochemistry, facies analysis and geological mapping to characterize and correlate the formations of the Indus Basin Sedimentary rocks, we review the nature of these contacts and the identification and correlation of the formations. Our results reveal that previously interpreted stratigraphic contacts identifying Chogdo Formation unconformably overlying Indian plate sedimentary rocks are incorrect. Rather, we suggest that the inaccuracy of previous interpretations is most likely a result of Formation misidentification and thus cannot be used to constrain the timing of India–Asia collision.
Himalaya, India–Asia collision, Indus–Tsangpo suture zone, Indus molasse
0012-8252
265-292
Henderson, Alexandra L.
3f24b108-2a16-459c-b515-fa707b9a52bf
Najman, Yani
5c3c01dd-9b5c-4c47-94fc-c712ba40bce5
Parrish, Randall
bb844c22-d16e-489d-9370-979204ada1a8
Mark, Darren F.
a1bf2e89-504b-45f0-8fcc-d74053fe0cd0
Foster, Gavin L.
fbaa7255-7267-4443-a55e-e2a791213022
Henderson, Alexandra L.
3f24b108-2a16-459c-b515-fa707b9a52bf
Najman, Yani
5c3c01dd-9b5c-4c47-94fc-c712ba40bce5
Parrish, Randall
bb844c22-d16e-489d-9370-979204ada1a8
Mark, Darren F.
a1bf2e89-504b-45f0-8fcc-d74053fe0cd0
Foster, Gavin L.
fbaa7255-7267-4443-a55e-e2a791213022

Henderson, Alexandra L., Najman, Yani, Parrish, Randall, Mark, Darren F. and Foster, Gavin L. (2011) Constraints to the timing of India–Eurasia collision; a re-evaluation of evidence from the Indus Basin sedimentary rocks of the Indus–Tsangpo Suture Zone, Ladakh, India. Earth-Science Reviews, 106 (3-4), 265-292. (doi:10.1016/j.earscirev.2011.02.006).

Record type: Article

Abstract

Deposited within the Indus–Tsangpo suture zone, the Cenozoic Indus Basin sedimentary rocks have been interpreted to hold evidence that may constrain the timing of India–Eurasia collision, a conclusion challenged by data presented here. The Eurasian derived 50.8–51 Ma Chogdo Formation was previously considered to overlie Indian Plate marine sedimentary rocks in sedimentary contact, thus constraining the timing of collision as having occurred by this time. Using isotopic analysis (U–Pb dating on detrital zircons, Ar–Ar dating on detrital white mica, Sm–Nd analyses on detrital apatite), sandstone and conglomerate petrography, mudstone geochemistry, facies analysis and geological mapping to characterize and correlate the formations of the Indus Basin Sedimentary rocks, we review the nature of these contacts and the identification and correlation of the formations. Our results reveal that previously interpreted stratigraphic contacts identifying Chogdo Formation unconformably overlying Indian plate sedimentary rocks are incorrect. Rather, we suggest that the inaccuracy of previous interpretations is most likely a result of Formation misidentification and thus cannot be used to constrain the timing of India–Asia collision.

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More information

Published date: June 2011
Keywords: Himalaya, India–Asia collision, Indus–Tsangpo suture zone, Indus molasse

Identifiers

Local EPrints ID: 191513
URI: http://eprints.soton.ac.uk/id/eprint/191513
ISSN: 0012-8252
PURE UUID: a65dbd3a-5008-4f93-b3dd-2f96ffc87037
ORCID for Gavin L. Foster: ORCID iD orcid.org/0000-0003-3688-9668

Catalogue record

Date deposited: 21 Jun 2011 15:34
Last modified: 09 Nov 2021 03:21

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Contributors

Author: Alexandra L. Henderson
Author: Yani Najman
Author: Randall Parrish
Author: Darren F. Mark
Author: Gavin L. Foster ORCID iD

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