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地球学报  2006 

记录地幔中存在氧元素的自然铁-方铁矿组合

DOI: 10.3975/cagsb.2006.01.06

Keywords: 自然铁,方铁矿,眼球构造,地幔,蛇绿岩,西藏

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Abstract:

笔者在西藏蛇绿岩的铬铁矿石中发现了十分复杂的地幔矿物群,其中包括自然铁-方铁矿的共生组合,它们被认为是外地核和下地幔的物质通过地幔柱作用携带到上地幔的。新发现的自然铁-方铁矿组合表明,外地核液态铁溶解有部分氧,当液态铁由外地核上升时,氧从液态铁中析出并呈不混溶状态存在于液态铁中。随着乳滴状自然铁球粒向上运移,在降压条件下液态铁和氧元素发生化学反应生成方铁矿(包括NIAS结构)。当氧耗尽时,在方铁矿中遗留下氧耗尽的空洞,形成眼球状构造。因此,眼球构造可能是外地核向地幔释放氧,下地幔内存在氧元素的历史记录。

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