40Ar/39Ar Geochronology of Supergene Alunite-Group Minerals
详细信息
- 责任者：Yang Jing (State Key Laboratory of Earthquake Dynamics ; Institute of Geology ; China Earthquake Administration ; Beijing 100029 ; China) ; Zheng Dewen
- 刊名：Seismology and Geology
- 出版年：2013
- 卷期：35(1)
- 关键词：明矾石 ; alunite ; 氩—氩计时 ; Ar-Ar dating
- 页码：p.177-187
- 图表：illus., 43 refs.
- 分类号：0700
- issnNo：ISSN0253-4967
- isbnNo：CN11-2192/P
摘要
Recently the successful application of laser heating 40Ar/39Ar dating to supergene alunite-group minerals demonstrates the applicability of the method to dating minerals existing in the oxidation zones of sulfur rich ore deposits. Laser-heating 40Ar/39Ar method not only reduces the amount of samples,but also the system background level; In addition,40Ar/39Ar step-heating dating method can test for the presence of hypogene contaminants,the excess/inherited Ar,and the multiple generations of supergene minerals. Although problems remain in isotopic dating of supergene alunite-group minerals,the systematic sampling and reasonable analysis process,combined with a variety of detection methods,can yield meaningful weathering ages,which will provide a new approach for the research on the timing of continental weathering,the formation of oxidization zones,and climatic desiccation of Northwest China.
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