40Ar/39Ar GEOCHRONOLOGY OF SUPERGENE ALUNITE-GROUP MINERALS

doi:10.3969/j.issn.0253-4967.2013.01.015

Abstract

Abstract:

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.

Key words: alunite-group minerals, ⁴⁰Ar/³⁹Ar dating, paleoclimate

摘要：

近年来,激光⁴⁰Ar/³⁹Ar法成功测定了硫化物矿床氧化带中表生明矾石族矿物(明矾石和黄钾铁矾)的年龄,表明这类矿物适用于 ⁴⁰Ar/³⁹Ar法定年。激光熔样方法引入⁴⁰Ar/³⁹Ar定年,不仅减少了样品的用量,同时也降低了系统的空白本底水平; 利用阶段加热法得到的年龄谱图,不仅可以有效识别原生矿物的混染和多世代矿物的存在,还可以检测样品中的过剩、继承Ar。虽然风化矿物定年还存在一些潜在的问题,但是只要有科学的采样和合理的分析流程,并结合其他检测手段,就可以获得有意义的风化年龄。这为研究新生代以来化学风化、氧化带形成时间和古气候提供了新的方法。

关键词: 明矾石族矿物, ⁴⁰Ar/³⁹Ar定年, 古气候

CLC Number:

P313

YANG Jing, ZHENG De-wen, WU Ying. ⁴⁰Ar/³⁹Ar GEOCHRONOLOGY OF SUPERGENE ALUNITE-GROUP MINERALS[J]. SEISMOLOGY AND GEOLOGY, 2013, 35(1): 177-187.

杨静, 郑德文, 武颖. 表生明矾石族矿物⁴⁰Ar/³⁹Ar年代学概述[J]. 地震地质, 2013, 35(1): 177-187.

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⁴⁰Ar/³⁹Ar GEOCHRONOLOGY OF SUPERGENE ALUNITE-GROUP MINERALS

表生明矾石族矿物⁴⁰Ar/³⁹Ar年代学概述

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