东昆仑布尔汗布达早古生代岩浆弧的形成与演化初探

王秉璋; 李积清; 付长垒; 许海全; 李五福

doi:10.3799/dqkx.2021.094

Volume 47 Issue 4

Apr. 2022

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Article Navigation > Earth Science > 2022 > 47(4): 1253-1270

Wang Bingzhang, Li Jiqing, Fu Changlei, Xu Haiquan, Li Wufu, 2022. Research on Formation and Evolution of Early Paleozoic Bulhanbuda Arc in East Kunlun Orogen. Earth Science, 47(4): 1253-1270. doi: 10.3799/dqkx.2021.094

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Wang Bingzhang, Li Jiqing, Fu Changlei, Xu Haiquan, Li Wufu, 2022. Research on Formation and Evolution of Early Paleozoic Bulhanbuda Arc in East Kunlun Orogen. Earth Science, 47(4): 1253-1270. doi: 10.3799/dqkx.2021.094

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Research on Formation and Evolution of Early Paleozoic Bulhanbuda Arc in East Kunlun Orogen

doi: 10.3799/dqkx.2021.094

1.
Key Laboratory of the Northern Qinghai-Tibet Plateau Geological Processes and Mineral Resources, Qinghai Geological Survey Institute, Xining 810012, China
2.
Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China

Received Date: 2021-04-15
Available Online: 2022-04-29
Publish Date: 2022-04-25

Abstract

Abstract

The Bulhanbuda arc is located in the south of the central fault of East Kunlun orogen. Different from the Late Paleozoic-Mesozoic magmatic arc in the North Kunlun, Early Paleozoic magmatic rocks are widely exposed in the Bulhanbuda area and of great significance to the researches of subduction-accretion process of the Proto-Tethyan Ocean. In this study, it reports the petrology, geochemistry, zircon U-Pb ages, Lu-Hf and Sr-Nd isotopic compositions of the Early Paleozoic magmatic rocks from the Bulhanbuda area. This and previous studies indicate that the subduction-related magmatic activities can be divided into three stages: Cambrian (515-482 Ma), Middle Ordovician (465-463 Ma), and Late Ordovician-Early Silurian (454-438 Ma). The Cambrian magmatic rocks contain Nb-enriched mafic-ultramafic rocks and metaluminous high-K calc-alkaline diorite. The Ordovician magmatic rocks are weakly peraluminous high-K calc-alkaline monzogranites. The Late Ordovician magmatic rocks are dominated by weakly peraluminous medium- and high-K calc-alkaline diorite and monzogranite and contain some metaluminous calc-alkaline quartz diorite and tholeiitic dolerite. These three stage intrusive rocks show similar trace element compositions with those of continental arc andesite. The Sr/Y ratios of the Cambrian diorite are low (22.6-30.0), the Sr/Y ratios of the Middle Ordovician monzogranite are medium, and these of Late Ordovician granodiorite and monzogranite are high. All of these intrusive rocks are enriched in radiogenic Sr and Nd isotopes. The Cambrian diorites display high initial ⁸⁷Sr/⁸⁶Sr ratios of 0.715 1-0.715 7 and low ε_Nd(t) values of -7.4 to -7.3. The Middle Ordovician monzogranite have initial ⁸⁷Sr/⁸⁶Sr ratios of 0.707 6-0.707 7 and ε_Nd(t) values of -2.5 to -2.4. The Late Ordovician granodiorite and monzogranite have low initial ⁸⁷Sr/⁸⁶Sr ratios (0.705 9-0.706 5) and negative ε_Nd(t) values (-3.3 to -1.7). However, the diorite shows relatively high initial ⁸⁷Sr/⁸⁶Sr ratios (0.706 9-0.708 5) and low ε_Nd(t) values (-6.0 to -5.6). The three stage magmatic rocks show wide range of the zircon Hf isotopes. Cambrian diorites have negative ε_Hf(t) values (-6.8 to -4.4). Middle Ordovician monzogranites display positive ε_Hf(t) values (+0.13 to +2.90). Late Ordovician granidorite and monzogranite show wide range of ε_Hf(t) values (-2.7 to +9.2). The diorites mainly yield negative ε_Hf(t) values (-8.6 to -2.1). In conclusion, the Bulhanbuda arc is an Andean-type continental margin arc formed during the southward subduction of the Proto-Tethyan Ocean. It has undergone three significant evolutionary stages. In the early stage (515-482 Ma), partial melting of the mantle wedge generated the basic magma, which induced remelting of the Paleoproterozoic lower crust to form intermediate-acid magma. In the middle period (465-463 Ma), the mantle derived basic magma underpenetrated and the thickened lower crust was partially melted to form small-scale acid magma. In the late period (454-438 Ma), the mantle derived basic magma underpenetrated and the thickened lower crust was partially melted to form large-scale intermediate-acid magmatic rocks with adakitic geochemical composition.
- East Kunlun,
- Bulhanbuda,
- Early Paleozoic,
- magmatic arc,
- petrology

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