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首页> 外文期刊>Journal of China University of Geosciences >Geochemical Features of Ophiolite in Mianxian-Lueyang Suture Zone, Qinling Orogenic Belt
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Geochemical Features of Ophiolite in Mianxian-Lueyang Suture Zone, Qinling Orogenic Belt

机译:秦岭造山带勉县-岳阳缝合带蛇绿岩地球化学特征

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摘要

The ultrabasic rocks in the Mianxian-Lueyang ophiolite belt are mainly harzburgite and dunite, and exhibit two types of REE distribution pattern: (1) LREE depletion, with remarkable Eu enrichment; (2)slight enrichment of LREE, with Eu deficiency. Both gabbros (accumulative gabbros) and diabasic dike swarms show a LREE enrichment but a slight Eu anomaly. The ratios of w(Ti)/w(V), w(Th)/w(Ta), w(Th)/w(Yb) and w(Ta)/w(Yb) indicate that the mid-ocean ridge basalts in this region originated from depleted mantle of asthenosphere, implying an association of MORB-type ophiolite and an ancient ocean basin between Qinling and Yangtze plates during Middle Paleozoic—Early Mesozoic era. The island arc volcanic rocks can be divided into tholeiitic and calc-alkaline associations, which originated from the upper mantle wedge above slab by partial melting.
机译:勉县-洛阳蛇绿岩带中的超基性岩主要为哈兹伯格岩和榴辉岩,并表现出两种REE分布模式:(1)LREE耗竭,Eu富集明显; (2)轻度富集稀土元素。辉长岩(蓄积辉长岩)和辉瑞堤防群均显示LREE富集,但有轻微的Eu异常。 w(Ti)/ w(V),w(Th)/ w(Ta),w(Th)/ w(Yb)和w(Ta)/ w(Yb)之比表示中洋脊玄武岩该地区的起源是软流圈的贫化,这意味着在中古生代-早中生代,MORB型蛇绿岩与秦岭和扬子板块之间的古代海洋盆地有关。岛状弧火山岩可分为生烃组合和钙碱性组合,它们起源于板块上方的上地幔楔通过部分熔融。

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