内蒙古金厂沟梁地区晚三叠世脉岩地球化学特征及成岩动力学背景

付乐兵; 魏俊浩; 魏启荣; 谭俊; 李艳军; 李闫华; 王明志; 蒋永建

doi:10.3799/dqkx.2010.108

Volume 35 Issue 6

Jun. 2010

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Article Navigation > Earth Science > 2010 > 35(6): 933-946

FU Le-bing, WEI Jun-hao, WEI Qi-rong, TAN Jun, LI Yan-jun, LI Yan-hua, WANG Ming-zhi, JIANG Yong-jian, 2010. Petrogenesis and Geodynamic Setting of Late Triassic Dykes of Jinchanggouliang, Eastern Inner Mongolia. Earth Science, 35(6): 933-946. doi: 10.3799/dqkx.2010.108

Citation:

FU Le-bing, WEI Jun-hao, WEI Qi-rong, TAN Jun, LI Yan-jun, LI Yan-hua, WANG Ming-zhi, JIANG Yong-jian, 2010. Petrogenesis and Geodynamic Setting of Late Triassic Dykes of Jinchanggouliang, Eastern Inner Mongolia. Earth Science, 35(6): 933-946. doi: 10.3799/dqkx.2010.108

Citation:

FU Le-bing, WEI Jun-hao, WEI Qi-rong, TAN Jun, LI Yan-jun, LI Yan-hua, WANG Ming-zhi, JIANG Yong-jian, 2010. Petrogenesis and Geodynamic Setting of Late Triassic Dykes of Jinchanggouliang, Eastern Inner Mongolia. Earth Science, 35(6): 933-946. doi: 10.3799/dqkx.2010.108

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Petrogenesis and Geodynamic Setting of Late Triassic Dykes of Jinchanggouliang, Eastern Inner Mongolia

doi: 10.3799/dqkx.2010.108

1.
Faculty of Earth Resources, China University of Geosciences, Wuhan 430074, China
2.
Yichang Institute of Geology and Mineral Resources, Yichang 443005, China

Received Date: 2010-03-30
Publish Date: 2010-11-01

Abstract

Abstract

Jinchanggouliang region, which consists of Jinchanggouliang, Erdaogou and Xiaoerdaogou gold deposits, is located in the north of North China Craton (NCC) and south of Inner Mongolia-Daxinganling orogenic belt. Numerous early Mesozoic diorites and diorite porphyries occurred and yielded LA-ICP-MS zircon U-Pb age of 228±1 Ma (MSWD=0.26) in the region. Both diorites and diorite porphyries are dominated by shoshonitic rocks, which contain SiO₂ ranging from 51.22% to 68.48% and MgO from 1.35% to 8.13%, and are characterized by high contents of Na₂O+K₂O and Al₂O₃ but low concentrations of P₂O₅. These rocks are enriched in LREE, LILE but depleted in HFSE. All samples possess uniform (⁸⁷Sr/⁸⁶Sr)_i isotopic ratios (0.704 95-0.705 92) but relatively wider range of ε_Nd(t) (-0.2 to -9.5) and T_2DM ages (1.02-1.77 Ga). These results indicate that the magma source derived from mixing of lithospheric mantle and lower crust melt. Diagrams of major and trace elements reveal that dykes formed in transitional environment between land arc and intra-plate. Combined with some new discoveries in the neighborhood, such as dyke swarms, alkaline intrusive complex and A2-type granite, this study proposes that NCB had completed the collision with Siberia plate in Late Triassic and the north of NCC went into a post-orogenic extension stage.
- dykes,
- Triassic,
- post-orogenic extension,
- geochemistry,
- geochronology,
- Inner Mongolia

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References(98)

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Petrogenesis and Geodynamic Setting of Late Triassic Dykes of Jinchanggouliang, Eastern Inner Mongolia

doi: 10.3799/dqkx.2010.108

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