Citation: | MA Yunfei, JIAO Jiangang, WANG Meng, YAN Xinyun, LIU Jian, GAO Chao, WANG Jing, LI Feng, YAO Ruijun. Precambrian basement rock assemblage and formation age in Damaoqi area of Inner Mongolia, northern margin of the North China Craton[J]. Geological Bulletin of China, 2022, 41(4): 559-576. doi: 10.12097/j.issn.1671-2552.2022.04.004 |
Precambrian basement is distributed nearly east-west trending in the Damaoqi area along the northern margin of the North China Craton.Previous studies classified it as the Sertengshan Group based on the characteristics of rock assemblage, but without chronological evidence.This paper discusses the Precambrian basement rock assemblage, formation age and material source in this area, based on petrology, LA-ICP-MS zircon U-Pb age and trace element geochemistry, and zircon Lu-Hf isotope.The research shows that the Precambrian basement is composed of the Sertengshan Group and Paleoproterozoic metamorphic intrusions.The Sertengshan Group is composed of biotite plagiogneiss and marble, formed during 2009~2142 Ma and belongs to the Paleoproterozoic.There are two periods of intrusions in Paleoproterozoic, 1992~1999 Ma and 1920 Ma respectively.In the Damaoqi area, continental crust accretion occurred at ~2.6 Ga and 2009~2142 Ma, respectively.The alkali feldspar granite and quartz diorite formed at 1999~1992 Ma were remelted products of juvenile continental crust, which may be contaminated by ancient continental crust materials.The biotite monzogranite formed at 1920 Ma was the product of the remelting of the ancient continental crust.The results of this study provide more evidences for the Precambrian tectonic evolution of the northern margin of the North China Craton.
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① | 内蒙古地质矿产(集团)有限责任公司. 内蒙古达尔罕茂明安联合旗等四幅1: 5万区域矿产地质调查报告. 2014. |
Tectonic location map (a)and regional geological map (b)of the Damaoqi area
Cathodoluminescence images of selected zircon crystals from the Precambrian crystalline basement in the Damaoqi area
Histogram(a), concordia plots(b, c, e, g) and weighted average of zircon U-Pb ages(d, f, h) from biotite plagioclase gneiss
Concordia plots(a, c, e) and weighted average of zircon U-Pb ages(b, d, f) from alkali feldspar granite, quartz diorite and biotite monzogranite
Zircon REE distribution patterns of the Precambrian basement Sertengshan Group and Paleoproterozoic metamorphic intrusive rocks in Damaoqi area
Zircon Hf isotopic characteristics in Damaoqi area (a) and histogram of age distribution of zircons from Precambrian crystalline basement in the central part of the Yinshan Block, northern margin of the North China Craton(b)