摘要
对大麦地锡矿区出露的云岭花岗闪长岩体地球化学特征进行了研究,岩石中SiO2含量变化范围为60.25%～66.44%,平均值64.41%;K2O含量为0.37%～4.39%,平均值3.07%;全碱(wK2O+wNa2O)为3.44%～11.47%,平均值5.92%;岩石铝指数(ACNK)平均值为2.62。大麦地锡矿区花岗闪长岩的地球化学特征表明,该岩石属于富硅、铝的高钾钙碱性系列花岗岩,全碱含量较高,Nb、Ta、Sr、P、Zr和Hf亏损,轻、重稀土元素分馏明显,显示一定程度的负铕异常,岩石处于挤压碰撞的构造环境中。从区域构造演化特征分析,这一结论与云岭岩体所处位置比较吻合。
Geochemical characteristics of Yunling granodiorite in the Damaidi Sn ore district were studied in this paper. SiO2 content varies in the range of 60.25% N 66.44% , 64.41% on average; K2O content is 0.37% ~ 4.39% , 3.07% on average; WK2O ＋ WNa2O content is 3.44% ~ 11.47%, 5.92% on average. ACNK of the rock is 2.62 on average. The granodiorite belongs to the high-K calc- alkaline and aluminum saturation series, characterized by the depletion of Nb, Ta, St, P, Zr and Hf. Based on trace elements dia- grams, the authors found that there exist obvious magmatic differentiation and negative Eu anomaly, suggesting that Yunling granodior- ite belongs to syncollision granite.
出处
《物探与化探》
CAS
CSCD
2012年第4期567-572,共6页
Geophysical and Geochemical Exploration
基金
河南省2008年度地质勘查基金项目(HNDK2008-07)资助
关键词
滇西南
云岭花岗闪长岩体
地球化学特征
稀土元素
构造环境
southwestern Yunnan
Yunling granodiorite
geochemical characteristics
REE
tectonic environment
