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Multichronometric evidence for an in-situ origin of the ultrahigh-pressure metamorphic terrane of Dabieshan, China

Record type: Article

U-Pb zircon data on gneisses indicate a Late Proterozoic protolith at approx. 700 Ma at Bixiling and a Late Archean to Early Proterozoic for the Shuanghe sheet within the ultrahigh-pressure metamorphic terrane of Dabieshan (China). U-Pb zircon and Sm-Nd dates on the gneisses of the Shuanghe sheet constrain a metamorphic peak at approx. 230 Ma. Rb-Sr and 40Ar-39Ar analyses of phengite from five gneisses in the Bixiling Complex yield ages at 198212 Ma, overlapping the 190220-Ma age on eclogites. The host gneisses record a similar metamorphic evolution as the coesite-bearing eclogites since both the peak and the retrograde evolution were contemporaneous. This argues for an in situ tectonic relationship.

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Citation

Chavagnac, V., Jahn, B., Villa, I.M., Whitehouse, M.J. and Liu, D. (2001) Multichronometric evidence for an in-situ origin of the ultrahigh-pressure metamorphic terrane of Dabieshan, China The Journal of Geology, 109, (5), pp. 633-646.

More information

Published date: 2001
Organisations: Ocean and Earth Science

Identifiers

Local EPrints ID: 1334
URI: http://eprints.soton.ac.uk/id/eprint/1334
ISSN: 0022-1376
PURE UUID: c535838c-d846-4910-8ed3-2d59aee2481c

Catalogue record

Date deposited: 16 Apr 2004
Last modified: 17 Jul 2017 17:16

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Contributors

Author: V. Chavagnac
Author: B. Jahn
Author: I.M. Villa
Author: M.J. Whitehouse
Author: D. Liu

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