广西姑婆山复式岩基的多源特征及其大地构造形成机制

姑婆山复式岩体及其外接触带的脉岩类,具有明显的多来源的成因特征,常量元素、微量元素(包插稀土元素)和锶同位素变异特征,既与初始岩浆的不同有关,又与围岩的地球化学特征有关,岩浆侵位通道及定位空间围岩组分的加入是造成花岗岩类地球化学特征变异的重要原因。地洼区结构的复杂性和岩浆活动的穿透性是造成本区岩浆岩多源特征的根本原因。

POLYSOURCE FEATURES OF GUPOSHAN COMPOSITE BATHOLITH WITH REFERENCE TO THEIR GEOTECTONIC MECHANISM

The granit oidsin the Guposhan Region, including the Guposhan polyphasic intrusion and the vein rocks distributed in its contact zone, show obvious polygenic features. This is indicated by the variation of major elements, trace elements (including REE) and Sr isotope compositions, which is related both to the difference of mitial magmas and to the incorporation of sedimentary rocks originally occupying the space of the intrusion and its path. It is the construction complexity of the Diwa Region and the penetration of magma that result in the polygenic features of the granitoids