中祁连马衔山岩群内基性岩墙群锆石LA-ICP-MS U-Pb年代学及其构造意义

何世平; 王洪亮; 陈隽璐; 徐学义; 张宏飞; 任光明; 余吉远

Volume 33 Issue 1

Jan. 2008

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Article Navigation > Earth Science > 2008 > 33(1): 35-45

HE Shi-ping, WANG Hong-liang, CHEN Juan-lu, XU Xue-yi, ZHANG Hong-fei, REN Guang-ming, YU Ji-yuan, 2008. LA-ICP-MS U-Pb Zircon Geochronology of Basic Dikes within Maxianshan Rock Group in the Central Qilian Mountains and Its Tectonic Implications. Earth Science, 33(1): 35-45.

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LA-ICP-MS U-Pb Zircon Geochronology of Basic Dikes within Maxianshan Rock Group in the Central Qilian Mountains and Its Tectonic Implications

1.
Xi'an Institute of Geology and Mineral Resources, CGS, Xi'an 710054, China
2.
Faculty of Earth Sciences, China University of Geosciences, Wuhan 430074, China
3.
Department of Geology, Northwest University, Xi'an 710069, China

Received Date: 2007-01-06
Publish Date: 2008-02-25

Abstract

Abstract

A large number of basic dikes which indicate an important tectonic-magmatic event in the eastern part of the middle Qilian orogenic belt were found in the Maxianshan rock group, Yongjing County, Gansu Province, China. According to research on their characteristics of geology and petrology, basic dike swarms, widely intruded in Maxianshan rock group, are divided into two phases. U-Pb isotopes of zircons from the basic dikes of the two phases were determined by LA-ICP-MS respectively in the State Key Laboratory of Continental Dynamics of Northwest University, and the causes of formation of the zircons were studied by using CL images. The formation age of the earlier phase of variational gabbro dikes is(441.1± 1.4) Ma(corresponding to the early stage of Early Silurian), and the age of main metamorphic period is(414.3± 1.2)Ma(corresponding to the early stage of Early Devonian). The formation age of the later phase of diabase dike swarms is(434± 1.0) Ma(corresponding to the late stage of Early Silurian), and the age of main metamorphic period is(414.3± 1.2)Ma(corresponding to the early stage of Early Devonian). The captured-zircons from diabase dike swarms retain some information of material interfusion by Maxiashan rock group(²⁰⁷Pb/²⁰⁶Pb apparent ages are(2 325± 3)Ma-(2 573± 6)Ma), and some zircons from diabase dike swarms also retain information impacted by tectonic thermal event during the late period of Caledonian Movement(²⁰⁶Pb/²³⁸U apparent ages are(400± 2)Ma-(429± 2)Ma). The study, together with others, suggests that, the basic dikes within Maxianshan rock group formed in the period when Qilian transferred from subductional orogeny towards collisional orogeny, which is the geological record of NW-SE extension during regional NE-SW toward intense compression in the Central Qilian block.
- Maxianshan rock group,
- basic dike swarm,
- zircon,
- LA-ICP-MS U-Pb geochronology,
- Silurian,
- extension

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References(81)

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LA-ICP-MS U-Pb Zircon Geochronology of Basic Dikes within Maxianshan Rock Group in the Central Qilian Mountains and Its Tectonic Implications

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