摘要:
大草坪钼矿区侵入体由花岗岩和花岗闪长岩组成,两者呈侵入接触关系,接触带附近石英脉较发育并见钼矿化。花岗岩与花岗闪长岩具有相似的岩石地球化学特征:主量元素特征均显示富含硅、碱质,普遍具有较高的钾含量,主要属钙碱性系列;稀土元素球粒陨石标准化配分模式显示LREE相对富集,球粒陨石标准化曲线都一致向右倾斜,曲线之间呈现近于平行的特征,说明两者具有同源性。笔者同时认为,大草坪岩体的成因类型为I型花岗岩,岩浆物质具壳幔混源特征;岩体与矿体具有明显的同源分异特征,可为成矿提供一定物质来源。
Abstract:
The Dacaoping intrusion is composed of granite and granodiorite bodies, and the former intrudes in the latter. Qartz veins and molybdenum mineralization can be seen in the contact zone. The granite and granodio-rite have the similar geochemical characteristics. The major elements are rich in silicon and alkali, generally with a high potassium content. They belong mainly to calc-alkaline series. Chondrite normalized patterns show that the both rocks enrich light rare earth elements (LREE), chondrite-nomalized curves are tilted to the right consis-tently, and the curves are nearly parallel to each other. The characteristics above suggest that the both rocks are homology. All this showing that the rocks are from I-type granite which come from the mixing of shell and man-tle, and the tectonic environment of the rocks is orogenic environment. The rocks and ore bodies have homolo-gous differentiation obviously, the rocks can provide ore-forming materials for the molybdenum ore.
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