四川得荣新州辉长闪长岩体岩石学及地球化学特征  

Petrology and Geochemistry of the Xinzhou Gabbrodiorite Intrusive in Dêrong,Sichuan

作　　者：贾志泉[1] 郝娇 JIA Zhi-quan;HAO Jiao(No.108 Geological Team,BGEEMRSP,Chengdu611230)

机构地区：[1]四川省地质矿产勘查开发局一〇八地质队,四川崇州611230

出　　处：《四川地质学报》2020年第3期355-358,共4页Acta Geologica Sichuan

摘　　要：新州辉长闪长岩体(νδT3)分布于中咱-中甸地块的东侧,邻近沙鲁里-义敦岛弧带,本文研究四川得荣新州辉长闪长岩体的岩石地球化学特征,岩体主要辉长闪长岩-苏辉长闪长岩组成,岩石中造岩矿物以斜长石为主,角闪石为辅。斜长石含量40%~62%,角闪石含量30%~60%,辉石含量3%~5%,磁铁矿等暗色不透明矿物一般含量3%~10%。地球化学分析结果表明:新州辉长闪长岩体SiO2含量48.28%~49%,全碱含量在0.79%~1.24%,Al2O3含量15.96%~16.63%,A/CNK值在0.57~0.6,ΣREE为9.35×10^-6~11.84×10^-6,LREE/HREE比值为1.56~1.79;该岩体为亚碱性系列次铝岩石类型,构造环境为洋中脊环境。The Xinzhou gabbrodiorite intrusive(νδT3)is exposed on the eastern side of the Zongza-Zhongdian massif and is close to the Shaluli-Yidun island arc zone.The intrusive consists of gabbrodiorite-hypersthenes gabbrodiorite.The rock is composed of 40%~52%plagioclase,30%~60%amphibole,3%~5%pyroxene and 3%~10%magnetite etc.and contains 48.28%~49%SiO2,0.79%~1.24%Na2O+K2O,15.96%~16.63%Al2O3 with A/CNK values of 0.57~0.6,ΣREE of 9.35~11.84 ppm,LREE/HREE values of 1.56~1.79.The rock belongs to subalkaline series subaluminous type.The tectonic setting is mid-oceanic ridge.

关 键 词：中咱地块 辉长闪长岩 亚碱性系列 地球化学特征 

分 类 号：P595[天文地球—地球化学]