LA-ICP-MS U-Pb Geochronology of Detrital Zircon from the Hongshuiquan Formation in the Northern Great Hinggan Area and Its Tectonic Significance
详细信息
- 责任者：Zhao Zhi (College of Earth Sciences ; Jilin University ; Changchun 130061 ; China) ; Chi Xiaoguo
- 刊名：Journal of Jilin University
- 出版年：2012
- 卷期：42(1)
- 关键词：碎屑沉积物 ; clastic sediments ; 铀—铅计时 ; U-Pb dating ; 大兴安岭 ; Greater Hinggan Mountains
- 页码：p.126-135
- 图表：5 illus., 1 table, 28 refs.
- 分类号：0803
- issnNo：ISSN1671-5888
- isbnNo：CN22-1343/P
摘要
The Hongshuiquan Formation, widely exposed in the northern Greater Hinggan area, consistsmainly of greywacke, sand-slate, carbonate rocks and tuffs, in which brachiopods, corals and bryozoans flourished in Early Carboniferous. LA-ICP-MS zircon U-Pb dating of the sandstones from the Hongshuiquan Formation in Ergun and Zhalantun area is carried out in order to discuss the Early Carboniferous basin type. The results show that 87 zircon concordant ages give four age groups. In this frame, the peak ages of 366 Ma, 441 Ma, 464 Ma and 502 Ma are consistent with the magmatic events in Ergun and Xing’an blocks, and the peak age of 1 848 Ma is widely existed in the two blocks, suggesting that sediments of the Hongshuiquan Formation mainly derive from Ergun-Xing’an blocks. The youngest peak age of 366 Ma indicates that the sediments come partly from the Late Devonian volcanic arc. The sandstones from the Hongshuiquan Formation have bidirectional sources. Combined with regional sediments in Early Carboniferous, the authors believe that the Hongshuiquan Formation is a suite of sedimentary sequenceformed in a back-arc basin setting.
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