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Zircon U–Pb geochronology of the Zanhuang metamorphic complex: reappraisal of the Palaeoproterozoic amalgamation of the Trans-North China Orogen

Published online by Cambridge University Press:  30 April 2013

LING-LING XIAO*
Affiliation:
Institute of Geology, Chinese Academy of Geological Sciences, 26 Baiwanzhuang Street, Beijing 100037, China College of Earth Science, University of Chinese Academy of Sciences, Beijing 100049, China
GUO-DONG WANG
Affiliation:
College of Earth Science, University of Chinese Academy of Sciences, Beijing 100049, China
HAO WANG
Affiliation:
College of Earth Science, University of Chinese Academy of Sciences, Beijing 100049, China
ZONG-SHENG JIANG
Affiliation:
College of Earth Science, University of Chinese Academy of Sciences, Beijing 100049, China Institute of Mineral Resources, Chinese Academy of Geological Sciences, 26 Baiwanzhuang Street, Beijing 100037, China
CHUN-RONG DIWU
Affiliation:
State Key Laboratory of Continental Dynamics, Department of Geology, Northwest University, Xi'an 710069, China
CHUN-MING WU
Affiliation:
College of Earth Science, University of Chinese Academy of Sciences, Beijing 100049, China
*
Author for correspondence: x_lingling@126.com

Abstract

Amphibolites and metapelites exposed in the Zanhuang metamorphic complex situated in the south-middle section of the Trans-North China Orogen (TNCO) underwent upper-amphibolite-facies metamorphism and record clockwise PT paths including retrograde isothermal decompression. High-resolution zircon U–Pb geochronological analyses indicate that the metamorphic peak occurred during ~ 1840–1860 Ma, which is in accordance with the ubiquitous metamorphic ages of ~ 1850 Ma retrieved by miscellaneous geochronologic methods throughout the metamorphic terranes of the northern TNCO, confirming that the south-middle section of the TNCO was involved in the amalgamation of the Eastern and Western Blocks of the North China Craton during the Palaeoproterozoic.

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Copyright
Copyright © Cambridge University Press 2013 

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