西北地质2017，Vol.50Issue(1)：126-133,8.
西秦岭东段秦岭大堡岩体地球化学特征及地质构造意义
Geochemical Character and Tectonic Significance of the Qinling Dabu Granite Body in the Eastern Section of Western Qinling Mountains
摘要
Abstract
After carrying out the detailed study on the petrology, isotope age, geochemistry of the Dabu granite batholithin Southeast Tianshui of Western Qinling Mountains, the original Dabugranite batholith has been further divided into Caledonian Baihua granite body and Indosinia Dabugranite body.The Baihua body has the character of I-type granite, which was formed in island-arc tectonic environment.The Dabu body is characterized by high AI2O3(with an average of 73.71%) and K2O +Na2O(8.50%~9.19%) contents, as well as low Fe2O3+FeO and MgO contents, which belong to peraluminous rocks and calc-alkaline-alkaline series.∑REE values range from 183.27×10-6 to 267.05×10-6, with enriched LREE and obvious negative Eu anomaly (δEu=0.27~0.53).The (87Sr ∕ 86Sr)0 values vary from 0.706 3 to 0.707 7, the δ18O values range from +9.12% to +9.86‰, showing the features of crust-derived granite and S-type granite, and suggesting that these granites were formed in post-collision tectonic environment and might be the products of continental uplift during the period of post-orogenics.关键词
花岗岩岩基/地球化学/构造环境/西秦岭/大堡岩体Key words
granite batholiths/geochemical character/tectonic environment/Western Qinling Mountains/Dabu granite body分类
天文与地球科学引用本文复制引用
温志亮,李普涛,郭周平,吴金刚..西秦岭东段秦岭大堡岩体地球化学特征及地质构造意义[J].西北地质,2017,50(1):126-133,8.基金项目
中国地质调查局矿产地质调查项目"秦岭成矿带文康-风太地区地质矿产调查"(DD20160014) （DD20160014）
