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
^40Ar/^39Ar geochronology of the ultrahigh-pressure metamorphic quartz-magnesitite in Zaheba, eastern Junggar, Xinjiang
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摘要: 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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关键词:
- 扎河坝-阿尔曼泰蛇绿岩 /
- 石英菱镁岩 /
- 超高压变质 /
- 多硅白云母^40Ar/^39Ar定年
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