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Zircon U–Pb ages and Hf isotope compositions of the Chencai migmatite, central Zhejiang Province, South China: constraints on the early Palaeozoic orogeny

Published online by Cambridge University Press:  17 April 2017

LONGMING LI ,
SHOUFA LIN ,
JIANHUA LI ,
JIAN HE  and
YANPENG GE
LONGMING LI*
Affiliation:
School of Resources and Environment, Hefei University of Technology, Hefei 230026, PR China
SHOUFA LIN
Affiliation:
School of Resources and Environment, Hefei University of Technology, Hefei 230026, PR China Department of Earth and Environmental Sciences, University of Waterloo, 200 University Avenue West, Waterloo, Ontario N2L 3G1, Canada
JIANHUA LI
Affiliation:
Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081, PR China
JIAN HE
Affiliation:
School of Resources and Environment, Hefei University of Technology, Hefei 230026, PR China
YANPENG GE
Affiliation:
School of Resources and Environment, Hefei University of Technology, Hefei 230026, PR China
*
†Author for correspondence: Longming_li@hfut.edu.cn
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Abstract

U–Pb ages and Hf isotope compositions of zircons from the Chencai complex in Zhejiang Province have been determined to provide constraints on mechanisms of migmatization and tectonic evolution related to the early Palaeozoic orogeny in the Cathaysia Block, South China. Zircons from leucosome samples of migmatites are characterized by nebulous overgrowths enclosing inherited cores or occur as newly formed grains with weak zoning. Five samples gave weighted mean ages ranging from 438±3 Ma to 432±4 Ma, which are interpreted as recording the time of anatexis of a regional tectono-thermal event. Their εHf(t) values range from −21.4 to −4.8 (with peak at −11), with corresponding TDM2 ages of 1.73–2.77 Ga (with peak at c. 1.9–2.3 Ga), suggesting that the protoliths formed by reworking of ancient crust evolved from Late Palaeoproterozoic – early Archaean crust–mantle differentiation. The migmatization was spatially and temporally associated with reported 460–435 Ma metamorphism with a clockwise pressure–temperature (P–T) path and was most likely controlled by crustal thickening driven by the early Palaeozoic orogenesis. The TDM2 ages of the Chencai complex are consistent with those of the Wuyi–Yunkai structural belt in the Cathaysia Block, but distinct from those (with peak at 2.7–3.0 Ga) of the Badu complex which lacks early Palaeozoic tectono-thermal records. The data support the suggestion that a postulated geological entity, instead of the east domain (the Badu complex being its main part) of the Cathaysia Block, was probably involved in the early Palaeozoic orogeny.

Keywords

zircon U–Pb ageHf isotopeChencai migmatite complexearly Palaeozoic orogenyCathaysia Block
Type
Original Article
Information
Geological Magazine , Volume 155 , Issue 6 , September 2018 , pp. 1377 - 1393
Copyright
Copyright © Cambridge University Press 2017 

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