阿拉善龙首山地区古元古代晚期变质‒深熔事件及其地质意义

关燕鹤; 曾认宇; 赖健清; 毛先成; 苏惠

doi:10.3799/dqkx.2022.435

Volume 48 Issue 11

Nov. 2023

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Article Navigation > Earth Science > 2023 > 48(11): 4034-4052

Guan Yanhe, Zeng Renyu, Lai Jianqing, Mao Xiancheng, Su Hui, 2023. Late Paleoproterozoic Metamorphic-Anatexis Events and Their Tectonic Implications in Longshoushan Area, Alxa Block. Earth Science, 48(11): 4034-4052. doi: 10.3799/dqkx.2022.435

Citation:

Guan Yanhe, Zeng Renyu, Lai Jianqing, Mao Xiancheng, Su Hui, 2023. Late Paleoproterozoic Metamorphic-Anatexis Events and Their Tectonic Implications in Longshoushan Area, Alxa Block. Earth Science, 48(11): 4034-4052. doi: 10.3799/dqkx.2022.435

Citation:

Guan Yanhe, Zeng Renyu, Lai Jianqing, Mao Xiancheng, Su Hui, 2023. Late Paleoproterozoic Metamorphic-Anatexis Events and Their Tectonic Implications in Longshoushan Area, Alxa Block. Earth Science, 48(11): 4034-4052. doi: 10.3799/dqkx.2022.435

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Late Paleoproterozoic Metamorphic-Anatexis Events and Their Tectonic Implications in Longshoushan Area, Alxa Block

doi: 10.3799/dqkx.2022.435

Guan Yanhe^{1, 3
,
,},
Zeng Renyu^{2, 3, 4, 5
,
,
,},
Lai Jianqing²,
Mao Xiancheng²,
Su Hui^{3, 4}

1.
School of Water Resources and Environment Engineering, East China University of Technology, Nanchang 330013, China
2.
Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring, Ministry of Education, Central South University, Changsha 410083, China
3.
State Key Laboratory of Nuclear Resources and Environment, East China University of Technology, Nanchang 330013, China
4.
School of Earth Sciences, East China University of Technology, Nanchang 330013, China
5.
Department of Earth Sciences, Durham University, Durham DH13LE, UK

Received Date: 2022-08-16
Available Online: 2023-11-30
Publish Date: 2023-11-25

Abstract

Abstract

The Alxa block is located in the southwestern margin of the North China craton. The Early Precambrian tectonic evolution and tectonic affinity of the block remain unknown or controversial, which restricts the study of the tectonic framework and evolution of the North China craton. The Longshoushan complex is one of the few Early Precambrian metamorphic basement rocks in the Alxa block, and records multiple Paleoproterozoic metamorphic events. Hence, which makes it possible to solve the above problems. It presents petrography, whole-rock geochemistry, and mineralogy, mineral geochemistry and chronology of zircon for the granitic pegmatite and zoisite amphibolite in the Longshoushan complex from the Jinchuan mining area in the central part of the Longshoushan area. The granitic pegmatite is characterized by SiO₂ contents of 69.70%-73.08%, belongs to weak peraluminous and shoshonite series, and formed from low degree partial melting of crustal rocks during migmatisation. The intersection ages of 1 892±7 Ma (MSWD=0.76) were obtained from the core of zircon in granitic pegmatite, representing the formation age of the granitic pegmatite. The zoisite amphibolite is characterized by SiO₂ contents of 41.51%-48.92%, and is the metamorphic product of tholeiitic diabase. Zircons in the zoisite amphibolite are amphibolite facies metamorphic zircons. The weighted average age of 1 830±8 Ma (MSWD=0.61) represents an amphibolite facies metamorphic event in the Longshoushan area. Combined with previous studies, there was a strong metamorphic-anatexis event in the Late Paleoproterozoic in the Longshoushan area, which is most likely related to a collisional orogeny. Through the comparison of tectonic-thermal events, it suggests that the Alxa block and the Khondalite belt of the North China craton have affinity in the Early Precambrian.
- North China craton,
- Alxa block,
- Longshoushan area,
- metamorphism-anatexis event,
- zircon,
- engineering geology

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References(97)

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Late Paleoproterozoic Metamorphic-Anatexis Events and Their Tectonic Implications in Longshoushan Area, Alxa Block

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