Detrital Zircon U-Pb Geochronological Records and Its Response of Provenance Transformation of Strata Surrounding Cambrian-Devonian Unconformity in Eastern Margin of Yunkai Massif

被引：4
|
作者：
Wang Z. [1 ,2 ]
Yang W. [1 ,2 ]
Zhou D. [1 ]
Niu Z. [1 ,2 ]
He Y. [2 ,3 ]
Song F. [1 ,2 ]
机构：
[1] Wuhan Center of China Geological Survey, Wuhan
[2] Key Laboratory for Paleontology and Coevolution of Life and Environment, China Geological Survey, Wuhan
[3] Institute of Geological Survey, China University of Geosciences, Wuhan
来源：
| 2018年 / China University of Geosciences卷 / 43期
关键词：
Detrital zircon; Geochronology; Guangxi orogeny; Sedimentology; Yu'nan orogeny; Yunkai massif;
D O I：
10.3799/dqkx.2018.242
中图分类号：
学科分类号：
摘要：
The unconformity of the Cambrian in the eastern margin of the Yunkai massif near Guigang, West Guangdong covers a set of gray-white quartz conglomerate-gravel sandstones. Due to the lack of fossils and U-Pb dating, the age of the stratum has remained controversial for a long time. By LA-ICP-MS U-Pb dating, a total of 300 valid data were obtained from 4 samples with age ranging from 2 900-400 Ma in this study. The samples below the unconformity surface are mainly concentrated at 1 100-700 Ma, and the youngest detrital zircon ages above the unconformity surface are concentrated at 450-400 Ma. The new dating data combined with previous research show that the ages of underlying and overlying strata in Guigang are Cambrian and Devonian, respectively. The source characteristics of the Cambrian are similar to those of the orogenic zone among India, eastern Antarctica and Australia. While the Devonian sources are relatively homogeneous, derived from the adjoining Yunkai massif. It is proposed that the unconformity of the study area should have resulted from the superposition of the Yu'nan orogeny and the Guangxi orogeny. © 2018, Editorial Department of Earth Science. All right reserved.
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页码：4193 / 4203
页数：10
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