Formation age of the Gaofan Group in Wutai area: New evidence from SHRIMP U-Pb zircon dating

被引：0
|
作者：
Wan Y. [1 ]
Dong C. [1 ]
Li P. [1 ]
Miao P. [2 ]
Wang H. [2 ]
Li J. [3 ]
机构：
[1] Beijing SHRIMP Center, Institute of Geology, Chinese Academy of Geological Sciences, Beijing
[2] Tianjin Geological Survey Center, China Geological Survey, Tianjin
[3] Shanxi Institute of Geological Survey, Taiyuan
来源：
Earth Science Frontiers | 2022年 / 29卷 / 02期
关键词：
Gaofan Group; North China Craton; Paleoproterozoic; SHRIMP U-Pb dating; Zircon;
D O I：
10.13745/j.esf.sf.2022.2.6
中图分类号：
学科分类号：
摘要：
The Gaofan Group in Wutai area is of great significance for the sequence establishment of Early Precambrian metamorphic strata in the North China Craton. This paper carried out the geochemical analysis and SHRIMP U-Pb zircon dating of the Mohe Formation of the Gaofan Group. The metamorphic sedimentary rocks have a total REE (rare earth elements) content of (132.78-231.84)×10-6 (except for sample W1927, which has a total REE of 1016.55×10-6), with weak enrichment of LREE (light REE) relative to HREE (heavy REE) ((La/Yb)N between 4.5-12.5) and obvious negative Eu anomaly (δEu between 0.37-0.62), and are similar in REE composition to post-Archean argillaceous rocks. A muscovite-quartz schist sample (D004) has a large number of detrital zircons aged around 2.7 Ga, 2.5 Ga, 2.54 Ga, 2.3 Ga and 2.18 Ga, with the youngest grains derived probably from contemporary volcanic rocks. A pyrite-bearing muscovite schist sample (W1927) has the youngest zircon age of 2194 Ma, which is considered to represent the deposition time of the rock. Combined with previous studies, it is concluded that the formation age of the Gaofan Group can be constrained between less than 2176 Ma and 2350 Ma, and the detrital materials are mainly derived from Neoarchean-Paleoproterozoic metamorphic basement in Hengshan, Wutai, Fuping, Yunzhongshan, Luliang areas or further afield. © 2022, Editorial Office of Earth Science Frontiers. All right reserved.
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页码：45 / 55
页数：10
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