40Ar/39Ar geochronology of supergene alunite-group minerals

被引：0
作者：
Yang, Jing [1 ]
Zheng, De-Wen [1 ]
Wu, Ying [1 ]
机构：
[1] State Key Laboratory of Earthquake Dynamics, Institute of Geology, China Earthquake Administration
来源：
Dizhen Dizhi | 2013年 / 35卷 / 01期
关键词：
!sup]40[!/sup]Ar/[!sup]39[!/sup]Ar dating; Alunite-group minerals; Paleoclimate;
D O I：
10.3969/j.issn.0253-4967.2013.01.015
中图分类号：
学科分类号：
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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页码：177 / 187
页数：10
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