石溪盆地和三百山盆地粗面岩地球化学特征及其地质意义  

Geochemical Characteristics of Trachyte in Shixi and Sanbaishan Basin,and Its Geological Significance

作　　者：张敏[1] 巫建华[1] 祝禧艳[2] 

机构地区：[1]东华理工大学地球科学与探测学院,江西抚州344000 [2]中国科学院地质与地球物理研究所,北京100029

出　　处：《东华理工大学学报（自然科学版）》2009年第1期52-60,共9页Journal of East China University of Technology(Natural Science)

基　　金：国家自然科学基金(40642010)

摘　　要：石溪盆地和三百山盆地粗面岩均具有高钾、高碱、高K2O/Na2O、高铝、低铁、低钛、氧化指数较高的特点,在SiO2-K2O图解中落入橄榄玄粗岩系列岩石区域之内,且富集高场强元素(HFSE)和大离子亲石元素(LILE),将两盆地粗面岩归为橄榄玄粗岩系列岩石。两盆地粗面岩均为地壳起源岩浆,且后期有地幔物质的加入,构造环境都是碰撞后拉张构造环境。不同的是石溪盆地粗面岩是经历了较强的结晶分异作用的产物。Trachyte in Shixi and Sanbaishan basins are characterized by ： high K and Al content, high alkali, high K2O/Na2O ,low Fe and Ti content , high Oxidation Coefficient, rich in large ion lithophile elements（LIlE） and high strength field elements （HFSE）, so the trachyte in Shixi and Sanbaishan basins belongs to shoshonite rocks. Both trachytes are Originated from Crust, and has joined the mantle material the latter, the tectonic setting is to extensional tectonic setting. The difference is that Trachyte of shixi Basin is the production which is undergo fractional crystallization.

关 键 词：赣南 赣东北 粗面岩 橄榄玄粗岩 

分 类 号：P591[天文地球—地球化学]