东乌旗晚石炭世辉石橄榄岩锆石U-Pb年龄及其构造意义

程银行; 张夏炜; 王少轶; 奥琮; 李影; 张天福; 滕学建

doi:10.3799/dqkx.2020.006

Volume 45 Issue 3

Mar. 2020

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Article Navigation > Earth Science > 2020 > 45(3): 844-855

Cheng Yinhang, Zhang Xiawei, Wang Shaoyi, Ao Cong, Li Ying, Zhang Tianfu, Teng Xuejian, 2020. Zircon U-Pb Dating and Geochemistry of Late Carboniferous Pyroxene Peridotite in Dong Ujimqi Inner Mongolia and Its Tectonic Significance. Earth Science, 45(3): 844-855. doi: 10.3799/dqkx.2020.006

Citation:

Cheng Yinhang, Zhang Xiawei, Wang Shaoyi, Ao Cong, Li Ying, Zhang Tianfu, Teng Xuejian, 2020. Zircon U-Pb Dating and Geochemistry of Late Carboniferous Pyroxene Peridotite in Dong Ujimqi Inner Mongolia and Its Tectonic Significance. Earth Science, 45(3): 844-855. doi: 10.3799/dqkx.2020.006

Citation:

Cheng Yinhang, Zhang Xiawei, Wang Shaoyi, Ao Cong, Li Ying, Zhang Tianfu, Teng Xuejian, 2020. Zircon U-Pb Dating and Geochemistry of Late Carboniferous Pyroxene Peridotite in Dong Ujimqi Inner Mongolia and Its Tectonic Significance. Earth Science, 45(3): 844-855. doi: 10.3799/dqkx.2020.006

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Zircon U-Pb Dating and Geochemistry of Late Carboniferous Pyroxene Peridotite in Dong Ujimqi Inner Mongolia and Its Tectonic Significance

doi: 10.3799/dqkx.2020.006

1.
Tianjin Center of China Geological Survey, Tianjin 300170, China
2.
School of Resources, Hebei GEO University, Shijiazhuang 050031, China

Received Date: 2019-09-17
Publish Date: 2020-03-15

Abstract

Abstract

The precise chronology and tectonic significance of pyroxene peridotite in Late Paleozoic granites in Dong Ujimqi, Inner Mongolia are still unclear, which will directly restrict the discussion of the properties and tectonic evolution in the study area. In this paper, petrography analysis, geochemistry and zircon U-Pb dating for the newly discovered pyroxene peridotite were studied. The analysis results show that main rock forming minerals are olivine, hornblende, orthopyroxene, and small amounts of plagioclase, biotite and clinopyroxene. The weighted average age obtained is 317.8±1.6 Ma, indicating that the intrusion was formed in the Late Carboniferous. Geochemical data show that, samples have SiO₂ content of 40.28%-44.50%, MgO content of 23.42%-29.44% and Na₂O+K₂O content of 1.00%-2.12%, have low m/f ratio (3.13-3.86), high FeO^T content (11.18%-14.70%) and Mg^# (75.60-79.26), and belong to the series of ferrous ultramafic rocks and tholeiites. These rocks have high REE (31.98×10^-6-72.60×10^-6), enrichment in LREE and relatively depletion in HREE, (La/Yb)_N=3.56-7.72, slightly Eu anomalies (δEu=0.79-1.65).The standardized distribution pattern of REE chondrites is right-leaning. The rocks are enriched in LILE (Rb, Sr, K) and depleted in HFSE (Nb, Ta), and there are obvious negative anomalies of Nb, Ta and Ti. Thus, we consider that the pyroxene peridotite had been formed in extensional tectonics from partial melting of the Sp-peridotite, which was modified by the subducted slab-derived fluid.
- pyroxene peridotite,
- Late Carboniferous,
- U-Pb age,
- Dong Ujimqi,
- geochemistry,
- geochronology

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Zircon U-Pb Dating and Geochemistry of Late Carboniferous Pyroxene Peridotite in Dong Ujimqi Inner Mongolia and Its Tectonic Significance

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