安徽女山橄榄岩包体的氧同位素比值和微量元素组成：地幔交代作用
Oxygen isotope and trace element compositions of peridotite xenoliths from Nushan volcano, SE China and implications for mantle metasomatism
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摘要: 1本文的研究对象是9个来自安徽女山新生代玄武岩的橄榄岩包体，利用激光氟化技术系统分析了橄榄石、单斜辉石和斜方辉石的氧同位素比值；利用LA-ICPMS技术分析了单斜辉石的微量元素组成，结果显示，女山橄榄岩存在辉石与橄榄石之间的氧同位素不平衡分馏现象，其中△Cpx-O1^18O（=δ^18OCpx-δ^18OO1））出现低至-0．5‰的负值；合角闪石包体中的单斜辉石明显富集大离子亲石元素（LILE，如Sr、Th、LREE）和亏损高场强元素（HFSE，如Nb、Zr、Ti），氧同位素的数据表明，女山上地幔曾经经历过俯冲洋壳流体参与的交代作用，根据单斜辉石和橄榄石之间氧同位素分馏值△Cpx-O1^18O与包体形成深度之间的负相关性，提出了一个“上升＋缓冲”的流体交代模型，虽然微量元素特征也表明女山上地慢受到过地壳流体的影响，但是氧同位素的不平衡分馏和LILE的富集／HFSE的亏损并不是同步的，对这种现象的可能解释是：引起氧同位素不平衡分馏的交代作用和造成女山单斜辉石微量元素特征的交代作用不是同一期的，即女山上地幔曾经发生过至少2次交代事件.
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Key words:
- Oxygen isotope /
- trace elements /
- peridatite /
- mantle metasomatism /
- Nushan
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