武夷地块北东部迪口地区下元岩体和红叶岗岩体锆石La- ICP- MS U- Pb年龄及其地质意义
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本文为武夷山松溪—庆元地区区域地质调查项目(编号:DD20190045)的成果。


U- Pb dating of zircons from Xiayuan and Hongyegang intrusives in Dikou area and their geological significance
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  • 1)中国地质调查局南京地质调查中心,南京,210016    
  • 1)中国地质调查局南京地质调查中心,南京,210016    
  • 2)合肥工业大学,合肥,230009    
  • 2)合肥工业大学,合肥,230009    
  • 2)合肥工业大学,合肥,230009    
  • 3)成都理工大学,成都,610059    
  • 1) China Geological survey (Nanjing Center), Nanjing, Jiangsu, 210016    
  • 1) China Geological survey (Nanjing Center), Nanjing, Jiangsu, 210016    
  • 2)School of Resources and Environment, Hefei University of Technology, Hefei, Anhui, 230009    
  • 2)School of Resources and Environment, Hefei University of Technology, Hefei, Anhui, 230009    
  • 2)School of Resources and Environment, Hefei University of Technology, Hefei, Anhui, 230009    
  • 3)College of Earth Sciences, Chengdu University of Technology, Chengdu, Sichuan, 610059    
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    摘要:

    迪口地区的下元岩体和红叶岗岩体位于武夷山地区东、西武夷俯冲碰撞增生杂岩带(450~440 Ma)中。我们对下元岩体中的三个岩石样品进行了锆石La- ICP- MS U- Pb测年,获得岩体的侵位结晶年龄分别为420±4 Ma、430±4 Ma和434±4 Ma,证明该岩体为加里东岩体,而非早期认为的印支期花岗岩。红叶岗岩体进行La- ICP- MS锆石U- Pb测年获得的年龄为398±4 Ma,表明红叶岗岩体为加里东晚期岩体,而非前人认为的燕山期花岗岩。结合武夷山地区最新的研究成果分析,我们认为迪口地区

    Abstract:

    Objectives: A lot of intrusives are located in the subduction—collision—accretion complex belt, which formed in 450~440 Ma, between the east and west Wuyi massif. The study of the geochronology of these intrusives is significant for defining the age of collision between east and west Wuyi massif and the convergence of Wuyi blocks, and also plays a certain role in promoting our understanding of the formation and emplacement of the Caledonian granitoids in South China. Methods: The Xiayuan and Hongyegang intrusives in Dikou area are typically developed in the subduction—collision—accretion complex belt. In this paper, the zircon LA- ICP- MS U- Pb dating method is used to make a detailed geochronology of the intrusives in this area. Results and Conclusions: Three rock samples taken from the Xiayuan granitic pluton in Dikou area were dated by zircons La- ICP- MS U- Pb technique, which show that the emplacement crystal ages of the Xiayuan intrusives were 420±4 Ma, 430±4 Ma and 434±4 Ma, respectively. It indicates that the Xiayuan granitic pluton is Caledonian intrusives, rather than Indosinian granite by the previous understanding. The zircon U- Pb age in Hongyegang granite was 398±4 Ma, indicates that the Hongyegang granite is a late Caledonian intrusives rather than Yanshanian granite. Combined with the analysis of the latest research results in Wuyi Mountain area, we suggest that the Xiayuan and Hongyegang intrusives in Dikou area may be formed in the extensional rift environment after the collision between the east and west Wuyi massif. The obtained emplacement ages of the Xiayuan and Hongyegang intrusives in Dikou area provide precise constraints for the Caledonian tectonic evolution of the Wuyi Blocks.

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刘欢,赵希林,葛延鹏,张金国,江涧,覃显著.2020.武夷地块北东部迪口地区下元岩体和红叶岗岩体锆石La- ICP- MS U- Pb年龄及其地质意义[J].地质论评,66(3):637-650,[DOI].
LIU Huan, ZHAO Xilin, GE Yanpeng, ZHANG Jinguo, JIANG Jian, QIN Xianzhu.2020. U- Pb dating of zircons from Xiayuan and Hongyegang intrusives in Dikou area and their geological significance[J]. Geological Review,66(3):637-650.

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  • 收稿日期:2019-08-31
  • 最后修改日期:2020-01-23
  • 在线发布日期: 2020-05-18