岩石矿物学杂志2012，Vol.31Issue(2)：155-163,9.
广西钦甲花岗岩体岩石地球化学特征及成因研究
Geochemistry and petrogenesis of the Qinjia granite in Guangxi
摘要
Abstract
The Caledonian granites in South China are not so well developed as Yanshanian granites, and the Qinjia granite in southwest Guangxi is one of the famous Caledonian granites. The Qinjia granitoid pluton, located at the southwestern edge of Yangtze plate, is a typical Early Paleozoic pluton. Based on previous research result of geochronology, the authors performed a lot of detailed work on geochemistry. The SiO2 content of rocks is in the range of 65.94 % ~ 72.23 %, the total alkalis content (K2O + Na2O) is in the range of 6.27 % ~ 9.11%, and the K2O content of most rocks is higher than Na2O content. The A/CNK values are 1.02-1.24, assigned to species of weakly peralumious. The rocks have low and remarkably varying REE, ranging from 17.18× 10"6 to 128.33 10-6, and their distribution patterns show LREE enrichment with gentle rightly-oblique deviation, relatively flat HREE and significant negative Eu anomaly. In trace elements, the Qinjia pluton is enriched in LILE Rb, Th and depleted in Ba, Sr. The research results show that the formation of Qinjia granite was probably linked with the collision between Yangtze plate and Cathaysia plate, and the source rocks of Qinjia granite were mainly composed of politic sandstone rocks, and some sediments with negative Ce anomalies probably entered magma source.关键词
加里东/地球化学特征/花岗岩成因/Ce负异常/钦甲岩体Key words
Caledonian/ geochemical charteristics/ granite genesis/ negative Ce anomalies/ Qinjia granite分类
天文与地球科学引用本文复制引用
王永磊,王登红,张长青,王成辉..广西钦甲花岗岩体岩石地球化学特征及成因研究[J].岩石矿物学杂志,2012,31(2):155-163,9.基金项目
全国危机矿山接替资源找矿项目之桂东-粤西地区铅锌金等矿床成矿规律总结研究(20089946) （20089946）
中央级公益性科研院所基本科研业务费专项资金(K0907) （K0907）
