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地球学报  2004 

雅鲁藏布江蛇绿岩的氦、氩同位素组成及其地质意义

Keywords: 蛇绿岩,,,地幔柱,雅鲁藏布江

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Abstract:

笔者测定了稚鲁藏布江地区蛇绿岩的氦、氩同位素组成。白朗的玄武岩He同位素组成比较均一,^3He/^4He平均值为5.359Ra;与之伴生的变橄岩的^3He/^4He比值范围为1.104~3.384Ra,平均为2.383Ra。从东部的仁布和大竹到西部的下鲁和白朗,辉绿岩的^3He/^4He由低变高。吉定的辉绿岩样品^3He/^4He比值平均高达31.57Ra,该值与夏威夷发现的高比值样品接近。分步加热法结果显示,该样品高比值的He是在低温区段释放的,这种高^3He/^4He比值He的捕获表明稚鲁藏布江蛇绿岩

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