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Detrital zircon U–Pb ages and Hf isotopic composition of the Ordovician Duguer quartz schist, central Tibetan Plateau: constraints on tectonic affinity and sedimentary source regions

Published online by Cambridge University Press:  28 April 2016

YIMING LIU ,
CAI LI ,
CHAOMING XIE ,
JIANJUN FAN  and
HAO WU
YIMING LIU
Affiliation:
The College of Earth Sciences, Jilin University, Changchun 130061, PR China
CAI LI*
Affiliation:
The College of Earth Sciences, Jilin University, Changchun 130061, PR China
CHAOMING XIE
Affiliation:
The College of Earth Sciences, Jilin University, Changchun 130061, PR China
JIANJUN FAN
Affiliation:
The College of Earth Sciences, Jilin University, Changchun 130061, PR China
HAO WU
Affiliation:
The College of Earth Sciences, Jilin University, Changchun 130061, PR China
*
*Author for correspondence: [email protected]
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Abstract

Many previous studies have investigated the late Palaeozoic ophiolites, migmatites and high-pressure metamorphic belts of the Tibetan Plateau, whereas the early Palaeozoic evolution of the regions is relatively poorly understood. Lower Palaeozoic strata, including the Duguer quartz schist, occur in the Himalaya, Lhasa and South Qiangtang terranes of the Tibetan Plateau. In this study, we report the depositional age and sedimentary provenance of the Duguer quartz schist of the central South Qiangtang terrane, which enables us to interpret the tectonic affinity of the terrane. We obtained U–Pb ages, trace-element compositions and Hf isotopic data from zircons from the Duguer quartz schist. A total of 162 U–Pb analyses of detrital zircons from the schist yielded two pronounced age peaks at c. 600 Ma and c. 960 Ma. These results indicate that the provenance of the Duguer quartz schist is India Gondwana or the terranes that share an affinity with India Gondwana in the Tibetan Plateau, which include the South Qiangtang and Himalaya terranes. Detrital zircon crystals show large variations in Hf isotope compositions, with εHf(t), TDM and TDMC values of −52.5 to 13.2, 900–3300 Ma and 1010–4240 Ma, respectively. This suggests that the source area for the Duguer quartz schist included Precambrian rocks and, more specifically, Pan-African and Grenville–Jinning crustal material. During Pan-African and Grenville–Jinning events, crustal recycling and the addition of mantle material occurred in the source regions of the quartz schist, when the South Qiangtang, Lhasa and Himalaya terranes were all part of the northern margin of Gondwana.

Keywords

GondwanaTibetan Plateaudetrital zirconsLA-ICP-MS zircon U–Pb datingHf isotopes
Type
Original Articles
Information
Geological Magazine , Volume 154 , Issue 3 , May 2017 , pp. 558 - 570
Copyright
Copyright © Cambridge University Press 2016 

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