Detrital Zircon U-Pb Dating and Its Geological Significance for the Bauxite in Wuchuan-Zheng’an-Daozhen Al Metallogenic, Guizhou Province , SW China
详细信息
- 责任者：Jin Zhongguo (Guizhou Nonferrous Metal and Nuclear Industry Geological Exploration Bureau ; Guiyang 550005 ; China) ; Zhou Jiaxi
- 刊名：Earth Science Frontiers
- 出版年：2013
- 卷期：20(6)
- 关键词：铝土矿 ; bauxite deposit ; 铀—铅计时 ; U-Pb dating ; 贵州 ; Guizhou Province
- 页码：p.226-239
- 图表：6 illus., 2 tables, 39 refs.
- 分类号：1001
- issnNo：ISSN1005-2321
- isbnNo：CN11-3370/P
摘要
Bauxite deposits in the Wuchuan-Zheng’an-Daozhen district,an important part of the south Chongqing-north Guizhou Al metallogenic province,are the main Al-enrichment region in Guizhou Province.The bauxite deposits are hosted in the Middle Permian Liangshan Formation,which lies on the erosion surface between Permian Qixia Formation and Carboniferous Huanglong Formation or Silurian Hanjiadian Formation.Four detrital zircon samples from three typical bauxite deposits were analyzed by Secondary Ion Mass Spectrometry(SIMS)for U-Pb dating.The results show that the range of 206Pb/238 U ages are large,almost all of the data are plotted on the U-Pb concordant curve and can be divided into five groups:i.e,433-591 Ma,740-1000Ma,1031-1442Ma,1700-1800Ma and 2300-2400Ma,of which the age groups of 433-591Ma,740-1000Ma and 1031-1442Ma are related to Silurian-Cambrian,Neoproterozoic Qingbaikouan and Mesoproterozoic undetermined periods,respectively.It implies that the ore-forming near source materials of the bauxite deposits are mainly detrital rocks in the Lower Silurian Hanjiadian formation,which were derived from the original distant sources-mainly metamorphosed volcanic sedimentary rocks in the Neoproterozoic and the Mesoproterozoic,which are related to the breaking of the Rodinian supercontinent,to the collision between Yangtze block and Cathaysia block,and to the Gvenille orogeny in the Mesoproterozoic.In this research,the youngest U-Pb age from the four samples is 303.1 Ma,which suggests the records of the crustal uplift,the denudation and the regional magmatism in the Late Carboniferous-Early Permian caused by Guizhou-Guangxi Movements.
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