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中南大学学报(英文版)

Journal of Central South University

Vol. 26    No. 12    December 2019

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Zircon U-Pb-Hf isotopes and mineral chemistry of Early Cretaceous granodiorite in the Lunggar iron deposit in central Lhasa, Tibet Y, China
ZHANG Yun-hui(张云辉)1, 2, 3, WANG Yang-shuang(王杨双)3, WANG Wen-shu(王文澍)1,LIU Jie(刘洁)1, YUAN Ling-ling(袁玲玲)1

1. Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring, Ministry of Education, School of Geoscience and Info-physics, Central South University,Changsha 410083, China;
2. Faculty of Geosciences and Environmental Engineering, Southwest Jiaotong University,
Chengdu 611756, China;
3. State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, College of
Environment and Civil Engineering, Chengdu University of Technology, Chengdu 610059, China

Abstract:The Lunggar iron deposit belongs to the Bangong-Nujiang metallogenic belt and is located in central Lhasa on the Tibetan Plateau. In the Lunggar deposit, iron mineralization formed in the skarnization contact zone between the Early Cretaceous granodiorite and the late Permian Xiala Formation limestone. In this study, we achieved detailed zircon U-Pb-Hf isotopes and mineral chemistry for the Early Cretaceous granodiorite. Zircon U-Pb dating results indicate that the Early Cretaceous granodiorite emplaced at ca. 119 Ma. Based on the trace elements in zircons and the mineral chemical composition of amphibole and biotite, the Early Cretaceous granodiorite was believed to form under condition of high temperature (>700 °C), low pressure (100-400 MPa), and relatively high oxygen fugacity (lgfO2)(-13.6 to -13.9) and H2O content (4%-8%). Zircon trace elements, Hf isotope and biotite chemistry collectively reveal that significant juvenile mantle-derived magmas contributed to the source of the granodiorite. The relatively high logfO2 and shallow magma chamber are beneficial for skarn iron mineralization, implying remarkable potential for further prospecting in the Lunggar iron deposit.

 

Key words: zircon U-Pb-Hf isotope; mineral chemistry; crystallization condition; Lunggar iron deposit; central Lhasa

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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