蒙古国东部矽卡岩型铁多金属矿床成矿岩体年代学及地球化学

张莉莉; 江思宏; 王怀坤; 孟祥熙; 张帅; 武昱东

doi:10.3799/dqkx.2021.136

Volume 47 Issue 8

Sep. 2022

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Article Navigation > Earth Science > 2022 > 47(8): 2856-2870

Zhang Lili, Jiang Sihong, Wang Huaikun, Meng Xiangxi, Zhang Shuai, Wu Yudong, 2022. Geochronology and Geochemical Features of the Ore-Related Granite in the Skarn Type Fe Polymetallic Deposits in Eastern Mongolia. Earth Science, 47(8): 2856-2870. doi: 10.3799/dqkx.2021.136

Citation:

Zhang Lili, Jiang Sihong, Wang Huaikun, Meng Xiangxi, Zhang Shuai, Wu Yudong, 2022. Geochronology and Geochemical Features of the Ore-Related Granite in the Skarn Type Fe Polymetallic Deposits in Eastern Mongolia. Earth Science, 47(8): 2856-2870. doi: 10.3799/dqkx.2021.136

Citation:

Zhang Lili, Jiang Sihong, Wang Huaikun, Meng Xiangxi, Zhang Shuai, Wu Yudong, 2022. Geochronology and Geochemical Features of the Ore-Related Granite in the Skarn Type Fe Polymetallic Deposits in Eastern Mongolia. Earth Science, 47(8): 2856-2870. doi: 10.3799/dqkx.2021.136

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Geochronology and Geochemical Features of the Ore-Related Granite in the Skarn Type Fe Polymetallic Deposits in Eastern Mongolia

doi: 10.3799/dqkx.2021.136

1.
MNR Key Laboratory of Metallogeny and Mineral Assessment, Institute of Mineral Resources, CAGS, Beijing 100037, China
2.
Mongolia Zhengyuan Co., Ltd., Jinan 250101, China

Received Date: 2021-05-13
Publish Date: 2022-09-25

Abstract

Abstract

In order to reveal the relationship between the ore genesis and the evolution of Mongolia⁃Okhotsk Ocean, we studied the whole rock geochemistry, U⁃Pb ages and Hf isotopes of the zircons from the ore⁃related granodiorite porphyry inthe Haraat Uul Fe⁃Zn deposit and biotite monzogranite in theTsahir Fe⁃Mo deposit. The ore⁃related granites were formed at ca. 278 Ma for the Haraat Uul Fe⁃Zn deposit and ca. 258 Ma for the Tsahir Fe⁃Mo deposit. The granitic rocks have high contents of K₂O and alkali, enrichments of LREE and LILEs (K, Rb), and depletions of HFSEs (Nb, Ta, Ti), which is indicative of high⁃K calc⁃alkaline Ⅰ⁃type granites. The granodiorite porphyry of the Haraat Uul Fe⁃Zn deposit has positive ε_Hf(t) range of 6.6~9.8 with two⁃stage depleted mantle Hf model ages of 672~877 Ma; the biotite monzogranite for the Tsahir Fe⁃Mo deposit has positive ε_Hf(t) range of 6.9~11.1 with two⁃stage depleted mantle Hf model ages of 568~855 Ma, indicating that both of the photoliths were probably derived from a Neoproterozoic depleted mantle. Fe polymetallic mineralisation at the Haraat Uul and Tsahir areas was intimately related to the south⁃eastward subduction of the Mongol⁃Okhotsk Ocean, indirectly proved that the Mongolian⁃Okhotsk Ocean plate began to south⁃eastward subduction before 278 Ma.
- U⁃Pb geochronology,
- skarn type,
- Fe-polymetallic deposit,
- Mongol-Okhotsk tectonic system,
- Mongolia,
- geochemistry

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