Multichronometric evidence for an in-situ origin of the ultrahigh-pressure metamorphic terrane of Dabieshan, China
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. Journal of Geology, 109, (5), 633-646.
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Description/Abstract
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.
| Item Type: | Article |
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| Related URLs: | |
| Subjects: | Q Science > QE Geology |
| Divisions: | University Structure - Pre August 2011 > School of Ocean & Earth Science (SOC/SOES) |
| Item ID: | 1334 |
| Date Deposited: | 16 Apr 2004 |
| Last Modified: | 25 Apr 2013 08:40 |
| Contributors: | Chavagnac, V. (Author) Jahn, B. (Author) Villa, I.M. (Author) Whitehouse, M.J. (Author) Liu, D. (Author) |
| Date: | 2001 |
| Status: | Published |
| URI: | http://eprints.soton.ac.uk/id/eprint/1334 |
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