Late Paleoproterozoic A-type granitic rocks in the northern Yangtze block: evidence for breakup of the Columbia supercontinent

被引：0
|
作者：
Huang M. [1 ]
Cui X. [2 ,3 ]
Cheng A. [1 ]
Ren G. [2 ]
He H. [4 ]
Chen F. [2 ,3 ]
Zhang H. [1 ]
Zhang J. [1 ]
Ren F. [2 ]
机构：
[1] General Prospecting Institute, China National Administration of Coal Geology, Beijing
[2] Chengdu Center of China Geological Survey, Chengdu
[3] Chengdu University of Technology, Chengdu
[4] Tarim Oilfield Company of PetroChina, Korla, 841000, Xinjiang
来源：
Dizhi Xuebao/Acta Geologica Sinica | 2019年 / 93卷 / 03期
关键词：
Aluminous A-type granite; Columbia supercontinent; Intraplate rift; Post-collisional extension; Yangtze Block;
D O I：
10.19762/j.cnki.dizhixuebao.2019041
中图分类号：
学科分类号：
摘要：
In order to constrain the Late Paleoproterozoic tectonic evolution of the Yangtze Block, this paper reported the geochemical, geochronological, whole-rock Nd isotopes and zircon Hf isotope analyses of the K-feldspar granites and monzogranites from the Huashanguan complex. U-Pb dating of magmatic zircons from K-feldspar granites and monzogranites yielded ages of 1860±12 Ma and 1832±14 Ma respectively, representing the age of their formation. The two types of granitoid are geochemically characterized by aluminous A-type granite. The consistent εHf(t) values (-10.9~-13.8) and TDM2 (2962~3183 Ma) indicate that the K-feldspar granites and monzogranites in the Huashanguan complex were formed by partly melting of the single Archean crust. The previous εHf(t) results also indicate that there two widely-distributed Archean felsic crusts (3.0~3.5 Ga; 3.5~3.9 Ga) in the Yangze Block provided material source for the magmatic evolution of the two types of granitoid. Zircons saturation temperatures of two types of the granite in Huashanguan reveal that the samples should source from much deep crust and monzogranites formed with more heat sources involved. Combined geochemical evidence of coeval A-type granite in the Yangtze block (~1.85 Ga), it can be concluded that the K-feldspar granites in Hushanguan complex and coeval A-type granite have features of post-collisional granite (A2-type and formed in a post-collisional setting. The monzogranites show the geochamical characteristic of A1 type granite, indicating a tectonic environment from post-collision to intraplate rift. The two magmatic events may be related to the breakup of Columbia supercontinent. © 2019, Science Press. All right reserved.
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页码：565 / 584
页数：19
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