青藏高原东南木里地区二叠纪苦橄岩的Os-Sr-Nd同位素地球化学研究
Sr-Nd-Os isotope geochemistry of Permain picrites from Mull area, southeast Tibet
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摘要: 本文报道了在青藏高原东南木里地区发现的二叠纪苦橄岩和与其共生玄武岩的主微量元素地球化学特征以及Os-Sr-Nd同位素组成.苦橄岩和与其共生玄武岩受地壳混染作用影响较小.根据苦橄岩的Ti/Y比值和初始的Os同位素组成,将木里苦橄岩分为两类:高Ti/Y型苦橄岩和低ⅣY型苦橄岩,其中高Ti/Y型苦橄岩具有高的γOs= 5.3～ 10.7和εNd= 5.9～ 6.4,与全球典型洋岛玄武岩的Os和Nd同位素组成接近,代表了地幔柱源区的同位素特征;而低Ti/Y型苦橄岩具有低的γOs=-4.1～ 1.2和εNd= 3.2～ 5.0,可能表明受到了SCLM(大陆岩石圈地幔)源区物质的混染.与其共生的玄武岩具有低的γOs=-3.5～-1.6和εNd=-0.6～ 0.7,表明其来自于不同于低Ti/Y型苦橄岩也有异于高Ti/Y型苦橄岩的地幔源区,但是也可能受到了SCLM物质的混染.基于Nd-Os同位素的地幔柱与SCLM的二端元混合模型显示:低Ti/Y型苦橄岩可能是SCLM物质组分与地幔柱起源的苦橄质原始岩浆混合形成的;与苦橄岩共生的玄武岩可能是由地幔柱来源的玄武质岩浆与SCLM小比例熔融的熔体混合形成的.
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关键词:
- 苦橄岩 /
- Sr-Nd-Os同位素 /
- 二叠纪 /
- 地幔柱 /
- 木里地区
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