华南地质与矿产2012，Vol.28Issue(4)：331-339,9.
钦杭成矿带西段古龙花岗岩株群岩石学、地球化学及年代学
Petrography, Geochemistry and Chronology of Gulong Granite Stock Group in West Segment of Qinzhou-Hangcheng Metallogenic Belt
摘要
Abstract
Gulong granite stock group is composed of the intrusive bodies in Dacun, Gulong, Sitai~ Shangmushui, Dapo, etc., and is mainly assembly of quartz diorite- tonalite- granodiorite- admellite, and commonly contain hornblende. Those rocks are belong to calc-alkaline series and high-K talc alkaline series, with higer CaO content. The rocks are characterized by low REE contents, consistently show LREE-riched patterns, weakly Eu depletion, depletion of Nb, Ta, Sr, P, Ti, and relatively rich in Th, U, Zr, Hi'. Zircon LA-ICP-MS U-Pb dating of quartz diorite yielded the isochron age of 445.9 _+ 1.2 Ma(MSWD=0.035 ) in Gulong granites, and indicated that Gulong granites stock group were formed in Early Silurian, and is part of Caledonian I-type granites which were formed in Caledonian orogenic belt of South China subduction-collision squeezing tectonic setting. The source for Gulong granite mainly are the mantle-derived magma from subduction zones, partly mixed with the crustal material when magma intrusion.关键词
岩石地球化学/LA—ICP—MS锆石u-Pb年龄/古龙花岗岩株群/钦杭成矿带西段Key words
petrogeochemistry/zircon LA-ICP-MS U-Pb daing/Gulong granite stock group/West segment of Qinzhou-Hangzhou metallogenic belt分类
天文与地球科学引用本文复制引用
许华,黄炳诚,倪战旭,钟辉运,黄英,李乾..钦杭成矿带西段古龙花岗岩株群岩石学、地球化学及年代学[J].华南地质与矿产,2012,28(4):331-339,9.基金项目
中国地质调查局地质矿产调查评价专项 （）
