Early Permian Bimodal Magmatism in the Duolun Area of the Central Section of the Northern Margin of the North China Craton

被引：2
|
作者：
Li T. [1 ,2 ]
Li S. [1 ,3 ]
Li P. [4 ]
Peng Y. [2 ]
Na M. [2 ]
Luo D. [2 ]
Zhao Q. [1 ]
Sun J. [1 ]
机构：
[1] College of Earth Sciences, Jilin University, Changchun
[2] No. 208 Geological Party, CNNC, Baotou
[3] Key Laboratory of Mineral Resources Evaluation in Northeast Asia, Ministry of Natural Resources, Changchun
[4] Institute of Geology, Chinese Academy of Geological Sciences, Beijing
来源：
Diqiu Kexue - Zhongguo Dizhi Daxue Xuebao/Earth Science - Journal of China University of Geosciences | 2023年 / 48卷 / 08期
关键词：
active continental margin; bimodal magmatites; extension setting; geochemistry; Northern margin of North China Craton; the early Permian;
D O I：
10.3799/dqkx.2021.210
中图分类号：
学科分类号：
摘要：
This paper presents petrological, Hf isotopes, geochronological and geochemical study on the early Permian Bimodal magmatites in Duolun area, Inner Mongolia, which is tectonically located in the northern margin of North China Craton, comprising quartz monzonite and basalt. U-Pb dating of zircons from the samples by LA-ICP-MS yield weighed mean 206Pb /238U ages of 283±1.6 Ma and 280±2.9 Ma respectively. They have similar Hf isotopes. Hf isotopes tDM2 was oldgenerally (from 1 760 to 2 354 Ma, merely two youngs:324 Ma and 824 Ma) and closed to these reported in ancient basement of North China Plate. The quartz monzonite and basalt exhibit SiO2 geochemical discontinuity (50.64%~65.87%), showing typically bimodal features. They also significantly enrich K, Na, Al and deplete Ca, Mg. Besides, the quartz monzonite show significantly depletions in Ti and P compared with the basalt, showing complementary relations. This paper, combined with previous data, suggest that Bimodal magmatitesare the products of partial melting of the ancient basement of the North China Plate under the background of extension, which was caused by the upward migrating and gathering of the mantle magma formed from partial melting of mantle resulted in dewatering of subducted plate of the ancient Asian Ocean. In the early Permian, Dongdashan area is under the background of active continental margin. © 2023 China University of Geosciences. All rights reserved.
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页码：2888 / 2904
页数：16
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