东北准噶尔哈旦逊石炭纪弧岩浆及堆晶柱形成机制

司翠芹; 刘伟; 刘秀金

doi:10.3799/dqkx.2021.044

Volume 47 Issue 1

Jan. 2022

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Si Cuiqin, Liu Wei, Liu Xiujin, 2022. Generation Mechanism of Carboniferous Arc Magma and Cumulate Column in Middle Arc Crust, Hadanxun of Northeast Junggar. Earth Science, 47(1): 325-341. doi: 10.3799/dqkx.2021.044

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Si Cuiqin, Liu Wei, Liu Xiujin, 2022. Generation Mechanism of Carboniferous Arc Magma and Cumulate Column in Middle Arc Crust, Hadanxun of Northeast Junggar. Earth Science, 47(1): 325-341. doi: 10.3799/dqkx.2021.044

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Generation Mechanism of Carboniferous Arc Magma and Cumulate Column in Middle Arc Crust, Hadanxun of Northeast Junggar

doi: 10.3799/dqkx.2021.044

Si Cuiqin^{1, 2, 3
,
,},
Liu Wei^{1, 2
,
,},
Liu Xiujin^{1, 2, 4}

1.
Key Laboratory of Mineral Resources, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China
2.
Innovation Academy for Earth Science, Chinese Academy of Sciences, Beijing 100029, China
3.
University of Chinese Academy of Sciences, Beijing 100049, China
4.
Key Laboratory of Geochemical Cycling of Carbon and Mercury in the Earth's Critical Zone, Institute of Geophysical and Geochemical Exploration, Chinese Academy of Geological Sciences, Langfang 065000, China

Received Date: 2021-02-17
Available Online: 2022-02-11
Publish Date: 2022-01-20

Abstract

Abstract

Secondary-ion mass spectrometric U-Pb age (324.8-323.1 Ma) and δ¹⁸O and laser-ablation multi-collector ICP-MS ε_Hf(t) of zircons, mineral chemistry and whole-rock geochemistry and Nd-Sr isotopes of the Carboniferous intrusive complex of Hadanxun were analyzed in this study in order to expound the mechanism of arc magma generation and decipher high P-wave velocity body in the middle crust of Northeast Junggar. Their rare earth element distribution patterns are concave-up. The major and trace element variations from diorite (with entrained hornblendite cumulate) to monzogranite, with decreasing Dy/Yb and primitive-mantle normalized Nb_N/Ta_N, can be reproduced with quantitative modeling of fractional crystallization of hornblendite (Stage 1) and feldspar-dominated minerals (Stage 2). They exhibit high Sr/Y, low Y and mean zircon δ¹⁸O of 6.42‰, suggesting derivation from subducting oceanic-slab. Al-in-hornblende barometer reveals that the hornblendite cumulate (population 1: 26-22 km depth; population 2: 20-18 km) constitutes high P-wave velocity body in the middle crust of Northeast Junggar. The Carboniferous intrusive complex of Hadanxun exhibits high positive zircon ε_Hf(t) (weighted mean=12.99) and depleted ε_Nd(t) (6.22-6.55) and (⁸⁷Sr/⁸⁶Sr)_i (0.703 7-0.704 0), precluding oceanic crust and continental-crustal materials from Chinese Altay as source component. Thus, the Northeast Junggar was an intra-oceanic arc and the oceanic-plate subduction continued until the Carboniferous.
- hornblendite cumulate,
- Carboniferous adakite,
- fractional crystallization,
- Northeast Junggar,
- intra-oceanic arc,
- southward subduction,
- geochemistry

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Generation Mechanism of Carboniferous Arc Magma and Cumulate Column in Middle Arc Crust, Hadanxun of Northeast Junggar

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