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Detrital zircon geochronology and geochemistry of Jurassic sandstones in the Xiongcun district, southern Lhasa subterrane, Tibet, China: implications for provenance and tectonic setting

Published online by Cambridge University Press:  18 April 2018

XINGHAI LANG ,
DONG LIU ,
YULIN DENG ,
JUXING TANG ,
XUHUI WANG ,
ZONGYAO YANG ,
ZHIWEI CUI ,
YONGXIN FENG ,
QING YIN  and
FUWEI XIE
...Show all authors
XINGHAI LANG
Affiliation:
College of Earth Science and MLR Key Laboratory of Tectonic Controls on Mineralization and Hydrocarbon Accumulation, Chengdu University of Technology, Chengdu 610059, China State Key Laboratory of Continental Tectonics and Dynamics, Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China
DONG LIU*
Affiliation:
College of Management Science, Chengdu University of Technology, Chengdu 610059, China
YULIN DENG
Affiliation:
College of Earth Science and MLR Key Laboratory of Tectonic Controls on Mineralization and Hydrocarbon Accumulation, Chengdu University of Technology, Chengdu 610059, China
JUXING TANG
Affiliation:
Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China
XUHUI WANG
Affiliation:
College of Earth Science and MLR Key Laboratory of Tectonic Controls on Mineralization and Hydrocarbon Accumulation, Chengdu University of Technology, Chengdu 610059, China
ZONGYAO YANG
Affiliation:
Faculty of Geosciences and Environmental Engineering, Southwest Jiaotong University, Chengdu 611756, China
ZHIWEI CUI
Affiliation:
College of Earth Science and MLR Key Laboratory of Tectonic Controls on Mineralization and Hydrocarbon Accumulation, Chengdu University of Technology, Chengdu 610059, China
YONGXIN FENG
Affiliation:
College of Earth Science and MLR Key Laboratory of Tectonic Controls on Mineralization and Hydrocarbon Accumulation, Chengdu University of Technology, Chengdu 610059, China
QING YIN
Affiliation:
College of Earth Science and MLR Key Laboratory of Tectonic Controls on Mineralization and Hydrocarbon Accumulation, Chengdu University of Technology, Chengdu 610059, China
FUWEI XIE
Affiliation:
Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China
YONG HUANG
Affiliation:
Chengdu Center of China Geological Survey, Chengdu 610081, China
JINSHU ZHANG
Affiliation:
College of Engineering, Tibet University, Lhasa 850012, China
*
†Author for correspondence: [email protected]
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Abstract

Jurassic sandstones in the Xiongcun porphyry copper–gold district, southern Lhasa subterrane, Tibet, China were analysed for petrography, major oxides and trace elements, as well as detrital zircon U–Pb and Hf isotopes, to infer their depositional age, provenance, intensity of source-rock palaeo-weathering and depositional tectonic setting. This new information provides important evidence to constrain the tectonic evolution of the southern Lhasa subterrane during the Late Triassic – Jurassic period. The sandstones are exposed in the lower and upper sections of the Xiongcun Formation. Their average modal abundance (Q21F11L68) classifies them as lithic arenite, which is also supported by geochemical studies. The high chemical index of alteration values (77.19–85.36, mean 79.96) and chemical index of weathering values (86.19–95.59, mean 89.98) of the sandstones imply moderate to intensive weathering of the source rock. Discrimination diagrams based on modal abundance, geochemistry and certain elemental ratios indicate that felsic and intermediate igneous rocks constitute the source rocks, probably with a magmatic arc provenance. The detrital zircon ages (161–243 Ma) and εHf(t) values (+10.5 to +16.2) further constrain the sandstone provenance as subduction-related Triassic–Jurassic felsic and intermediate igneous rocks from the southern Lhasa subterrane. A tectonic discrimination method based on geochemical data of the sandstones, as well as detrital zircon ages from sandstones, reveals that the sandstones were most likely deposited in an oceanic island-arc setting. These results support the hypothesis that the tectonic background of the southern Lhasa subterrane was an oceanic island-arc setting, rather than a continental island-arc setting, during the Late Triassic – Jurassic period.

Keywords

Jurassicsandstonedetrital zirconsgeochemistryLhasa terrane
Type
Original Article
Information
Geological Magazine , Volume 156 , Issue 4 , April 2019 , pp. 683 - 701
Copyright
Copyright © Cambridge University Press 2018 

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