阿拉善地块东部早古生代(约420 Ma)变质事件的发现及其地质意义:来自独居石与锆石U-Pb定年的新证据

刘平华; 邹雷; 田忠华; 冀磊; 施建荣

doi:10.3799/dqkx.2019.092

Volume 44 Issue 7

Jul. 2019

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Liu Pinghua, Zou Lei, Tian Zhonghua, Ji Lei, Shi Jianrong, 2019. Discovery and Geological Significance of an Early Paleozoic (Ca. 420 Ma) Metamorphic Event from the Eastern Alxa Block: New Evidence from Monazite and Zircon LA-ICP-MS U-Pb Dating. Earth Science, 44(7): 2441-2460. doi: 10.3799/dqkx.2019.092

Citation:

Liu Pinghua, Zou Lei, Tian Zhonghua, Ji Lei, Shi Jianrong, 2019. Discovery and Geological Significance of an Early Paleozoic (Ca. 420 Ma) Metamorphic Event from the Eastern Alxa Block: New Evidence from Monazite and Zircon LA-ICP-MS U-Pb Dating. Earth Science, 44(7): 2441-2460. doi: 10.3799/dqkx.2019.092

Citation:

Liu Pinghua, Zou Lei, Tian Zhonghua, Ji Lei, Shi Jianrong, 2019. Discovery and Geological Significance of an Early Paleozoic (Ca. 420 Ma) Metamorphic Event from the Eastern Alxa Block: New Evidence from Monazite and Zircon LA-ICP-MS U-Pb Dating. Earth Science, 44(7): 2441-2460. doi: 10.3799/dqkx.2019.092

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Discovery and Geological Significance of an Early Paleozoic (Ca. 420 Ma) Metamorphic Event from the Eastern Alxa Block: New Evidence from Monazite and Zircon LA-ICP-MS U-Pb Dating

doi: 10.3799/dqkx.2019.092

Liu Pinghua^{1,2
,},
Zou Lei^1,2,
Tian Zhonghua^1,2,
Ji Lei^1,2,
Shi Jianrong³

1.
Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China
2.
Key Laboratory of Deep-Earth Dynamics of Ministry of Natural Resources, Beijing 100037, China
3.
Tianjin Center, China Geological Survey, Tianjin 300170, China

Received Date: 2019-02-27
Publish Date: 2019-07-15

Abstract

Abstract

Precambrian meta-sedimentary rock is an important part of the Alxa Block, and accurate determination of the depositional and metamorphic timing of the meta-sedimentary rock is of great scientific significance for further understanding the origin, formation, evolution and affinity of the Alxa Block. This paper presents a detailed study on the field geological investigation, petrological observation, and zircon and monazite U-Pb dating of kyanite-bearing garnet mica quartz schists of the Deerhetongte Formation in the Alatanaobao area. The results of detrital zircon U-Pb dating and field geological investigation show that the crystallization age of detrital zircons of the Deerhetongte and Zuzongmaodao formations in Alatanaobao area ranges from 3 306 Ma to 1 146 Ma, and is characterized by the occurrence of high-frequency regions of Mesoproterozoic zircon age (1 800-1 100 Ma). The crystallization age of the youngest detrital zircons is circa 1 123 Ma, and the meta-sedimentary rocks are intruded by circa 900 Ma granitic gneisses. Thus, the depositional timing of the meta-sedimentary rocks of the the Deerhetongte and Zuzongmaodao formations in the Alatanaobao area is limited to 1 123~900 Ma, and it is a set of Late Mesoproterozoic-Early Neoproterozoic continental margin sedimentary rocks. In addition, the results of U-Pb dating and trace element analysis of metamorphic monazites and zircons indicate that a large number of metamorphic monazites are identified in the kyanite-bearing garnet mica quartz schists of the Deerhetongte Formation. They have typical REE distribution patterns of metamorphic monazites (strong enrichment of light REEs and strong depletion of heavy REEs). These monazites record a weighted average age of 419± 3 Ma (MSWD=7.1, n=40). Similarly, a zircon metamorphic rim also records ²⁰⁶Pb/²³⁸U age of 406±7 Ma. The metamorphic ages are interpreted as the timing of the late Early Paleozoic amphibolite-facies metamorphism-deformation of the kyanite-bearing garnet-mica quartz schist of the Deerhetongte Formation, probably in response to the late Early Paleozoic collision orogeny between the Alxa Block and the surrounding micro-continental blocks.
- eastern Alxa Block,
- kyanite-bearing garnet mica quartz schist,
- Early Paleozoic metamorphic event,
- Monazite and zircon U-Pb dating,
- petrology

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References(82)

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Discovery and Geological Significance of an Early Paleozoic (Ca. 420 Ma) Metamorphic Event from the Eastern Alxa Block: New Evidence from Monazite and Zircon LA-ICP-MS U-Pb Dating

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