东准噶尔扎河坝超高压变质成因石英菱镁岩的^40Ar/^39Ar同位素年代学信息及地质意义

牛贺才 单强 张海祥 于学元. 东准噶尔扎河坝超高压变质成因石英菱镁岩的^40Ar/^39Ar同位素年代学信息及地质意义[J]. 岩石学报, 2007, 23(7): 1627-1634.
引用本文: 牛贺才 单强 张海祥 于学元. 东准噶尔扎河坝超高压变质成因石英菱镁岩的^40Ar/^39Ar同位素年代学信息及地质意义[J]. 岩石学报, 2007, 23(7): 1627-1634.
NIU HeCai, SHAN Qiang, ZHANG HaiXiang, YU XueYuan. ^40Ar/^39Ar geochronology of the ultrahigh-pressure metamorphic quartz-magnesitite in Zaheba, eastern Junggar, Xinjiang[J]. Acta Petrologica Sinica, 2007, 23(7): 1627-1634.
Citation: NIU HeCai, SHAN Qiang, ZHANG HaiXiang, YU XueYuan. ^40Ar/^39Ar geochronology of the ultrahigh-pressure metamorphic quartz-magnesitite in Zaheba, eastern Junggar, Xinjiang[J]. Acta Petrologica Sinica, 2007, 23(7): 1627-1634.

东准噶尔扎河坝超高压变质成因石英菱镁岩的^40Ar/^39Ar同位素年代学信息及地质意义

  • 基金项目:

    国家自然科学基金(40673036)、中国科学院知识创新工程重要方向项目(KZCX2-YW-107)和国家科技支撑计划重点项目(2006BAB07802)联合资助.本文野外考察和资料收集工作得到新疆维吾尔自治区305项目办公室的大力支持,在样品分析和成文过程中得到中国科学院广州地球化学研究所邱华宁博士的真诚帮助,特邀主编朱永峰教授和三名匿名评审专家对本文提出了宝贵意见,谨致谢忱!

^40Ar/^39Ar geochronology of the ultrahigh-pressure metamorphic quartz-magnesitite in Zaheba, eastern Junggar, Xinjiang

  • 在扎河坝.阿尔曼泰蛇绿岩岩块内分布着高压-超高压成因的二辉橄榄岩、石榴辉石岩、石英菱镁岩及榴闪岩。石英菱镁岩内多硅白云母的Si(pfu)值均大于3.35,最高可达3.77,是典型高压-超高压成因的矿物。石英菱镁岩及其围岩蛇纹石化二辉橄榄岩的K2O含量极低,且多硅白云母的Na/(Na+K)比值小于0.04,这些地球化学特征显示,扎河坝多硅白云母不应含有过剩Ar,是一个理想的^40Ar/^39Ar定年对象。精确的^40Ar/^39Ar年代学研究结果表明,扎河坝石英菱镁岩中多硅白云母的^40Ar/^39Ar同位素年龄为281.6±2.5Ma。而矿物化学特征表明,扎河坝石英菱镁岩中的多硅白云母曾经历了退变质作用的改造,因此,它代表的应该是超高压变质石英菱镁岩的折返年龄。多硅白云母的^40Ar/^39Ar年代学研究结果表明,扎河坝-阿尔曼泰蛇绿混杂岩内超高压石英菱镁岩的折返事件应发生在早二叠世。
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修回日期:  2007-03-20
刊出日期:  2007-07-31

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