新疆阿勒吞昆多蛇绿混杂岩的地球化学特征及形成环境
Xinjiang ALeTunKunDuo Ophiolitic Melange of Geochemical Characteristics and Formation Environment
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摘要: 该蛇绿混杂岩的岩石组合为辉长岩、斜长花岗岩及火山熔岩等,缺失变质橄榄岩、超镁铁堆晶岩和辉绿岩岩墙单元。蛇绿岩中辉长岩和基性熔岩REE球粒陨石标准化和微量元素原始地幔标准化分配型式呈近平坦型分布,轻稀土亏损或略亏损,类似于岛弧(IAB)和扩张脊(MORB)过渡构造背景特征,形成于SSZ型洋盆底初始岛弧的弧前扩张环境。Abstract: The ophiolitic melange is consisted of gabbro, plagiogranite and volcanic lava, lacking of metamorphic peridotite, ultramafic cumulate rock and diabase dike unit. The standardized distribution pattern of REE chondrite in gabbro and basic lava of ophiolitic melange, and trace elements of the primitive mantle is nearly flat. There is loss or slight loss in light rare earth, which is similar to the transitional tectonic settings of island arc(IAB) and spreading ridge(MORB), indicating that the ophiolites is probably formed in the fore-arc expansion environment of incipient arc at the bottom of SSZ Oceanic basin.
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Key words:
- Xinjiang East JungaEr /
- ALeTunKunDuo /
- ancient asian ocean /
- ophiolite /
- ridge
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