安徽沿江地区中生代岩浆岩的基本特点  

The Essentail Features of Magmatic Rocks Along theYangtze River in Anhui Province

作　　者：邢凤鸣 徐祥[1] 

机构地区：[1]安徽省地质科学研究所

出　　处：《岩石学报》1995年第4期409-422,共14页Acta Petrologica Sinica

基　　金：国家八五科技攻关课题

摘　　要：安徽沿江地区位于长江中下游岩浆带中段，中生代岩浆活动强烈，类型复杂，特点突出。它具有夹心饼干式分带现象。中间为富碱的高钾钙碱性岩系和橄榄安粗岩系；两侧为钙碱性岩系。中间的岩浆岩具有高钾富碱、高Ｓｒ，低Ｍｇ、Ｃｒ、Ｎｉ，εＮｄ变化大但Ｉｓｒ变化小且较低以及岩浆演化的多样性为特点。Mesozoic magmatic rocks along the Yangtze River in Anhui Province are located at the middle section of the Yangtze magmatic rock belt. Mesozoic magmatism is strong and magmatic rock types are various with their own clear characteristics in this area. The magmatic rocks are divided into sandwich biscuitslikebelts. The magmatic rocks in interbelt consist of high-K alkali-rich rocks such as high-K calc-alkaline rock seriesand shoshonitic rock series, and in outbelts consist of calc-alkaline rock series with higher silica contents. Basedon different natures and metallogenetic characteristics, they may be divided into 6 rock associations: (1) High-Kcafe-alkaline intrusions; (2) High-Na alkali-lime intrusions; (3) Shoshonitic volcanic rocks; (4) Alkaline volcanic rocks; (5) A-type granites; (6) Silicic cafe-alkaline intrusions. The former 5 associations located in the interbelt are characterized by high-K alkali-rich, high-Sr, low MgO, Cr and Ni, and large range of aεNd, but lowerIsr with little variation, and varied magmatic evolutions.

关 键 词：岩浆岩 岩浆演化 中生代 安徽 

分 类 号：P588.1[天文地球—岩石学]