Volume 92, Issue 5 pp. 1888-1900
Original Article
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Source and Significance of Detrital Zircons from Mesozoic Sandstones of the Upper Yangtze Block, China

Dongdong LI

Dongdong LI

Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081 China

Chinese Academy of Geological Sciences, Beijing 100037 China

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Zhenhan WU

Zhenhan WU

Chinese Academy of Geological Sciences, Beijing 100037 China

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Xinqi YU

Xinqi YU

School of Earth Sciences and Resources, China University of Geosciences, Beijing 100083 China

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Ran WANG

Ran WANG

School of Earth Sciences and Resources, Chang'an University, Xi'an, Shanxi 710064 China

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Zongxiu WANG

Corresponding Author

Zongxiu WANG

Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081 China

Corresponding author. E-mail: [email protected]Search for more papers by this author
First published: 25 October 2018
Citations: 5

About the first author:

LI Dongdong, male, a doctor graduate student of Chinese Academy of Geological Sciences, obtained his bachelor's and master's degrees from China University of Geoscience, Beijing. He is now interested in thrust nappe structure and tectonics. E–mail: [email protected].

Abstract

In this study, we report U–Pb and Lu–Hf isotopic data for zircons from the Mesozoic sandstones of the Upper Yangtze area, which provide critical constraints on the provenance of these sediments and further shed light on the crustal evolution of the Upper Yangtze block. The results of isotopic chronology indicate the following: (1) The provenances of the study area are very complex, and the tectonic evolution process is relatively closed. (2) The provenances are mainly Archean–Proterozoic crystalline basement or recycled material; Paleoproterozoic crustal accretion in the western margin of the Yangtze block and Neoproterozoic magmatic activities related to subduction of the western margin of the Yangtze block; early Cambrian oceanic magmatic activity, which resulted from the intraplate extension of the northern margin of the Yangtze block; late Ordovician–early Silurian magmatic activity in the northern Yangtze block and Hercynian–Indochina uplift and erosion during the Hercynian movement. (3) The Yangtze crustal growth is episodic, and an increasing amount of ancient recycled material became part of the magmatic activity, as the zircon U–Pb ages are relatively young.

 

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