| China Geological Survey Chinese Academy of Geological Sciences | Host |
| 科学出版社 | Publish |
| Citation: |
YU Yuejiang, ZHAO Zhonghai, YANG Xinxin, LI Wenlong. 2021. Dating of Early Jurassic volcanic rocks in the Mohe foreland basin of northern Greater Khingan Mountains, northeast China[J]. Geology in China, 48(2): 580-592. doi: 10.12029/gc20210216
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Dating of Early Jurassic volcanic rocks in the Mohe foreland basin of northern Greater Khingan Mountains, northeast China
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Abstract
Intermediate-basic volcanic rocks are largely distributed in Greater Khingan Mountains of Heilongjiang Province, and the determination of their ages is of great significance to understanding the regional tectonic evolution and petrogenesis of the Mesozoic volcanic belt in the Great Xing'an Range. Based on the 1:50000 regional geological and mineral resources survey in the study area, the LA-ICP-MS zircon U-Pb geochronology, petrology and petrogeochemistry of the intermediate-basic volcanic rocks previously attributed into the Middle-Late Jurassic Tamulangou Formation were systematically studied. Zircon U-Pb dating of the two trachyandesite samples and one basaltic andesite sample yields (185.8±8.1)Ma, (196.8±2.1)Ma and (196.3±2.7)Ma respectively, which indicates that there exists a set of early Jurassic intermediate-basic volcanic rocks in the Tamulangou Formation. These Early Jurassic volcanic rocks belong to metaluminous, mainly high-K calc-alkaline series generally enriched in large ion lithophile elements (such as Ba、K、La、Ce、Sr、Zr) and LREE, but depleted in high field strength elements (such as Th、Nb、P、Zr、Ti) and HREE. Combined with the regional tectonic evolution, it is conclude that the early Jurassic intermediate-basic volcanic rocks were formed in an active continental margin setting related to the southward subduction of the Mongol-Okhotsk oceanic plate beneath the Erguna Massif during the Early Jurassic.
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References
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YU Yuejiang, ZHAO Zhonghai, YANG Xinxin, LI Wenlong. 2021. Dating of Early Jurassic volcanic rocks in the Mohe foreland basin of northern Greater Khingan Mountains, northeast China[J]. Geology in China, 48(2): 580-592. doi: 10.12029/gc20210216
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Figure 1.
Tectonic subdivisions of northeast China(a)、tectonic map of Greater Khingan (b) and simplified geological map of the study area (c)(a, b modified from Liu Chen et al., 2017)
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Figure 2.
Microphotographs of the volcanic rocks from the Tamulangou Formation in the study area
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Figure 3.
CL images (a, c) and Zircon U-Pb concordia diagram (b, d) of the trachyandesite in the study area
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Figure 4.
CL images (a) and Zircon U-Pb concordia diagram of the basalt andesite (D0007) in the study area
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Figure 5.
Diagrams of TAS (a)、K2O-SiO2 (b)、K2O-Na2O (c) and A/NK-A/CNK (d) of volcanic rocks in the Tamulangou Formation(after Peccerillo & Taylor, 1976)
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Figure 6.
Chondrite-normalized REE patterns and primitive mantle-normalized trace element patterns of the Tamulangou Formation volcanic rocks (Chondrite and primitive mantle values referring to Sun & McDonough, 1989)
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Figure 7.
Rb-(Y+Nb) (a)、Ta-Yb(b)、Th/Yb-Ta/Yb (c) and Th/Yb-Sr/Nd (d) diagram showing discrimination of tectonic environment of the Tamulangou Formation volcanic rocks(after Pearce et al., 1984; Labanieh et al., 2012)