皖南两花岗岩体的岩石学特征及成矿专属性判别

Petrlogic Characteristics and Discriminations of Metallogenetic specialization of 2 Granite Masses in South Anhui

皖南花岗岩体约２０余个，分同熔型及改造型两种，前者主要受印支褶皱带控制，常呈北东向展布；后者受燕山期深断裂制约，呈东西或南北向延伸。本文对区内有代表性的榔桥岩体（同熔型）和姚村岩体（改造型）两个岩体，分别从分布的地质背景、岩石矿物学、岩石化学、微量元素及稀土元素地球化学、铅同位素及岩浆演化等方面进行了研究和对比，并按花岗岩类成矿专属性模型法作了判别：前者主要与Ｆｅ、Ｃｕ、Ｐｂ、Ｚｎ、Ｍｏ等多金属矿化有关；后者与ｓｎ、Ｗ及ＴＲ矿种有关，判别结果与迄今的找矿实际基本吻合。

There are more than 20 granite masses in South Anhui,genetally,they can be divided into syntexis andtransformation types,while the former ones are always in NE-trending extension and controlled by the Indo-sinianfold belt;the latter, commonly, Ew-or NS-trending, controlled by the Yanshanian deep-faults. In this paper,the major different geological characteristics are illustrated from the research and contrast of resfonalsetting,petro-minerallogy,petrochemistry,geochlnistry of trace and REE element,Pb-isotope geology and magmaticevolution,etc,of the Langqiao granite (syntexis type)and the Yaocun one (transformation type), respoctively.Finally,the metallogenetic specialization of different granite masses are discriminated by using the medel-methed:the tungqiao granite samples are related to occurrences of Fe、Cu、Pb、Zn、Mo,etc; and that of Yaocun one to Sn,W and TR. The discrin1ination results are basically coincided with actual distribution of polymetallic mineralizations insuch area.