西北地质2012，Vol.45Issue(4)：76-82,7.
西秦岭西段花岗岩浆作用与成矿
The Granitoids Magmatism and Mineralization in West Section of the Western Qinling, NW China
摘要
Abstract
Based on petrogeochemistry, the samples form intrusions in western Qinling mostly belong to high-K calc-alkalic series with a few scatter to calc-alkalic series. The study results in this essay also show that there exist adakite and Himalaya type granites in the northern edge of Western Qinling, and the Jian-glugou, Ayishan and Zhongchuan intrusions are similar to Himalaya type granite, and Ayishan pluton is similar to adakite based on the content of Sr and Yb. Whereas, the Wenquan intrusion shows both adakite and Himalaya type granite according go geochemical features. The granites of adakite and Himalaly type with low Mg# may caused by partial melting of basalts in thickened lower crust. On the other hand, the adakite and Himalaya type granitoids in the northern edge of Western Qiling provide the clue to the collision of subduction between the North China Plate and the Yangtze Plate in Trassic period, which lead to the event of crust thickening, and the partial melting of thickened lower curst in different depth produced adakite or Himalaya type granite. In addition, the adakite or Himalaya type granitoid in northern edge of Western Qinling should be pay more attention to the mineralization of Cu-Au.关键词
花岗质侵入体/锆石U-Pb定年/岩石地球化学/构造演化/西秦岭北缘Key words
granitic plutons/ zircon U-Pb dating/ petrogeochemistry/ tectonic evolution/ northern edge of Western Qinling分类
天文与地球科学引用本文复制引用
徐学义,李婷,陈隽璐,李平..西秦岭西段花岗岩浆作用与成矿[J].西北地质,2012,45(4):76-82,7.基金项目
国家自然科学基金项目"罗汉寺岩组物质组成研究——对北秦岭古生代俯冲-增生作用的约束"(40972150),国土资源大调查项目"西北地区基础地质调查成果集成与综合研究"(1212011121137) （40972150）
