Zircon U-Pb-Hf isotopes and mineral chemistry of Early Cretaceous granodiorite in the Lunggar iron deposit in central Lhasa, Tibet Y, China

来源期刊:中南大学学报(英文版)2019年第12期

论文作者:袁玲玲 张云辉 王杨双 王文澍 刘洁

文章页码:3457 - 3469

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

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.

Cite this article as: ZHANG Yun-hui, WANG Yang-shuang, WANG Wen-shu, LIU Jie, YUAN Ling-ling. Zircon U-Pb-Hf isotopes and mineral chemistry of Early Cretaceous granodiorite in the Lunggar iron deposit in central Lhasa, Tibet Y, China [J]. Journal of Central South University, 2019, 26(12): 3457-3469. DOI: https://doi.org/10.1007/s11771- 019-4266-5.

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