西藏隆格尔铁矿床成岩成矿时代及对区域多期铁成矿作用的启示：地球化学、锆石U-Pb及金云母Ar-Ar同位素定年约束

高顺宝; 郑有业; 田坎; 陈鑫; 姜晓佳; 顾艳荣

doi:10.3799/dqkx.2020.216

Volume 46 Issue 6

Jun. 2021

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Gao Shunbao, Zheng Youye, Tian Kan, Chen Xin, Jiang Xiaojia, Gu Yanrong, 2021. Geochronology of Magmatic Intrusions and Mineralization of Lunggar Iron Deposit in Tibet and Its Implications for Regional Multi-Stage Iron Mineralization: Geochemistry, Zircon U-Pb and Phlogopite Ar-Ar Isotopic Dating Constraints. Earth Science, 46(6): 1941-1959. doi: 10.3799/dqkx.2020.216

Citation:

Gao Shunbao, Zheng Youye, Tian Kan, Chen Xin, Jiang Xiaojia, Gu Yanrong, 2021. Geochronology of Magmatic Intrusions and Mineralization of Lunggar Iron Deposit in Tibet and Its Implications for Regional Multi-Stage Iron Mineralization: Geochemistry, Zircon U-Pb and Phlogopite Ar-Ar Isotopic Dating Constraints. Earth Science, 46(6): 1941-1959. doi: 10.3799/dqkx.2020.216

Citation:

Gao Shunbao, Zheng Youye, Tian Kan, Chen Xin, Jiang Xiaojia, Gu Yanrong, 2021. Geochronology of Magmatic Intrusions and Mineralization of Lunggar Iron Deposit in Tibet and Its Implications for Regional Multi-Stage Iron Mineralization: Geochemistry, Zircon U-Pb and Phlogopite Ar-Ar Isotopic Dating Constraints. Earth Science, 46(6): 1941-1959. doi: 10.3799/dqkx.2020.216

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Geochronology of Magmatic Intrusions and Mineralization of Lunggar Iron Deposit in Tibet and Its Implications for Regional Multi-Stage Iron Mineralization: Geochemistry, Zircon U-Pb and Phlogopite Ar-Ar Isotopic Dating Constraints

doi: 10.3799/dqkx.2020.216

1.
Institute of Geological Survey, China University of Geosciences, Wuhan 430074, China
2.
Faculty of Earth Resources, China University of Geosciences, Wuhan 430074, China

Received Date: 2020-06-10
Publish Date: 2021-06-15

Abstract

Abstract

To find out the metallogenic age and environment of Lunggar iron-rich ore deposit and its indication of regional iron mineralization in Gangdese Belt, the petrogeochemistry, zircon U-Pb chronology, zircon Lu-Hf isotopes, and Ar-Ar dating of phlogopite have been carried out. The results show that: (1) there are two stages of magmatism: Early Cretaceous granodiorite (116.3 Ma) and Late Cretaceous diorite (94.3-93.8 Ma). The ⁴⁰Ar/³⁹Ar isochron age of gold mica in the main orebody is 93.71±2.96 Ma, indicating that the deposit was formed in the Late Cretaceous. (2) The diorite related to the mineralization is characterized by low SiO₂ content (52.17%-55.32%), enrichment of LREE and large ion lithophile elements such as Rb, Ba, and Pb, and depletion of HREE and high field strength elements such as Nb, Ta, and Ti, which belongs to the High-K calc-alkaline and metaluminous rock series. The zircon ε_Hf(t) is between 1.4 and 3.6, and the Mg^# index is very high (0.59-0.64), suggesting that more mantle-derived materials are added to the ore-forming pluton, which has the characteristics of crust-mantle mixing. (3) According to the ages of other iron deposits in Gangdese Belt, the iron mineralization can be divided into three stages, including ~115 Ma, ~94 Ma and 50-65 Ma. The Lunggar iron deposit suggests that it belongs to a new stage (Late Cretaceous) of iron-rich mineralization in Gangdese Belt. (4) Compared with the multi-stage skarn iron mineralization in the Gangdese metallogenic belt, it is found that there are obvious geochemical differences between the Lunggar iron ore-forming body and other periods of iron ore-forming body. The intermediate-basic magma with more mantle-derived materials may be easier to form iron-rich deposits than acid magma.
- chronology,
- skarn type,
- iron-rich deposit,
- crust-mantle mixing,
- Lunggar,
- Gangdese,
- geochemistry

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Geochronology of Magmatic Intrusions and Mineralization of Lunggar Iron Deposit in Tibet and Its Implications for Regional Multi-Stage Iron Mineralization: Geochemistry, Zircon U-Pb and Phlogopite Ar-Ar Isotopic Dating Constraints

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