黑沙山地区晚三叠世岩体地球化学特征及其成岩环境

Geochemical characteristics and diagenetic environment of the Heishashan late Triassic rock mass

为了研究小灶火地区黒沙山岩体的成岩环境、时代、构造环境、地区化学等特征,对岩体的主量元素、微量元素、稀土元素、同位素年龄等样品的数据进行了统计分析。分析认为岩体成岩时代为晚三叠世;主量元素总体显示偏铝质—高钾钙碱性花岗岩的成分特点,具I型和S型花岗岩类特征;成岩阶段经历了强烈的结晶分异及同源岩浆演化,是海西—印支造山运动进入陆陆碰撞阶段向造山后造山带伸展崩塌阶段转折时期的产物。

In order to study the diagenetic environment,diagenetic era,tectonic environment andgeochemistry of the rock mass in Heishashan of the Xiaozaohuo area,the main elements,trace elements,REE and isotopic ages of the rock mass were analyzed. The rock mass formed during the lateTriassic. The main elements show the compositional characteristics of the AluminiferoushighK calcalkaline granites,which are characterized by Itype and Stype granitoid. The diagenetic stage experienced intense crystallization differentiation and comagmatic evolution. The rock mass is the productof Hercynian - Indosinian orogenic movement during the transition from continental collision stage topostorogenic orogenic belt extension and collapse stage.