扬子克拉通黄陵背斜南部~860 Ma岩墙的成因及地质意义

蒋幸福; 彭松柏; 韩庆森

doi:10.3799/dqkx.2020.210

Volume 46 Issue 6

Jun. 2021

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Article Navigation > Earth Science > 2021 > 46(6): 2117-2132

Jiang Xingfu, Peng Songbai, Han Qingsen, 2021. Petrogenesis and Geological Significance of ca. 860 Ma Dikes in Southern Huangling Anticline, Yangtze Craton. Earth Science, 46(6): 2117-2132. doi: 10.3799/dqkx.2020.210

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Jiang Xingfu, Peng Songbai, Han Qingsen, 2021. Petrogenesis and Geological Significance of ca. 860 Ma Dikes in Southern Huangling Anticline, Yangtze Craton. Earth Science, 46(6): 2117-2132. doi: 10.3799/dqkx.2020.210

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Petrogenesis and Geological Significance of ca. 860 Ma Dikes in Southern Huangling Anticline, Yangtze Craton

doi: 10.3799/dqkx.2020.210

Jiang Xingfu^{1, 2
,
,},
Peng Songbai^{2, 3},
Han Qingsen²

1.
School of Earth Sciences, State Key Laboratory of Nuclear Resources and Environment, East China University of Technology, Nanchang 330013, China
2.
School of Earth Sciences, China University of Geosciences, Wuhan 430074, China
3.
State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Wuhan 430074, China

Received Date: 2020-05-28
Publish Date: 2021-06-15

Abstract

Abstract

It reports the first occurrence of Early Neoproterozoic dike swarm located in the southern Huangling anticline, Yangtze craton, which is composed of diabase, granodiorite and syengranite. Zircon U-Pb dating of diabasic and granodioritic dikes yields weighted mean ²⁰⁶Pb/²³⁸U ages of 856±6.4 Ma and 860±6.0 Ma, respectively, which are interpreted as the formation ages of the dike swarm. Whole-rock geochemical results show that diabasic dikes show high contents of Pb, variable Ba/Nb and La/Nb ratios, however, the granodioritic and syengranitic dikes have relative low contents of Y and Nb. In combination with age spectrums of inherited zircons from analytical dikes, it is proposed that the dike swarm experienced a certain crustal contamination of juvenile island arc during formed process. Document of ca. 860 Ma dike swarm in the southern Huangling anticline indicates that the Yangtze craton entered into the post-collisional extensional environment before 860 Ma. Therefore, it is inferred that Precambrian basement breakup of the Yangtze craton shows difference in spatial-temporal distribution.
- Yangtze craton,
- southern Huangling anticline,
- ~860 Ma mafic dike,
- Juvenile crustal contamination,
- extensional environment,
- petrology

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References(66)

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Petrogenesis and Geological Significance of ca. 860 Ma Dikes in Southern Huangling Anticline, Yangtze Craton

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