江西安远路迳金伯利质煌斑岩筒辉石巨晶和包体中辉石的氢氧同位素  

Hydrogen and Oxygen Isotopic of Pyroxenes from Mantle-Derived Megacryst and Xenolith of the Kimberlitic Lamprophyre Pipe in Lujing,Anyuan,Jiangxi Province

作　　者：张保民[1] 张晓黎[2] 叶德隆[1] 

机构地区：[1]中国地质大学,武汉430074 [2]上海对外贸易学院,上海200000

出　　处：《地质科技情报》2007年第1期19-22,共4页Geological Science and Technology Information

基　　金：国家自然科学基金项目(40372027)

摘　　要：利用离子探针和质谱技术分别分析测试了江西安远路迳金伯利质煌斑岩筒辉石巨晶和包体中辉石的氢氧同位素组成。结果显示,辉石的氢同位素δ(D)值从-83‰变化到-101‰,平均值为-91.6‰;氧同位素δ(18O)值由5.46‰变化到5.70‰,平均值为5.60‰。路迳辉石巨晶和包体中辉石的氢氧同位素组成均一,表明其来源于地幔,且其形成和演化过程中物理化学环境稳定,继承并保持了原始地幔的氢氧同位素组成。In this paper, hydrogen and oxygen isotopic composition of pyroxenes from mantle-derived megacryst and xenolith of the kimberlitic lamprophyre pipe in Lujing,Anyuan,Jiangxi Province has been obtained by ion microprobe and mass spectrometer respectively. Hydrogen isotopic value δ（D） of pyroxenes from the mantle-derived megacryst and xenolith changes from -83‰ to -101‰,and the average value is -91.6‰. Oxygen isotopic value δ（^18O） changes from 5.46‰ to 5.70‰, and the average value is 5.60‰. Evidently, hydrogen and oxygen isotopic of pyroxenes from mantle-derived megacryst and xenolith have homogenous composition. The formation and evolvement process of pyroxenes from mantle-derived megacryst and xenolith have stable physics and chemistry environment, and the pyroxenes keep hydrogen and oxygen isotopic composition. This study provides new data of the kinetic and geochemistry of the upper mantle in East China.

关 键 词：氢氧同位素 巨晶和包体辉石 金伯利质煌斑岩 江西省 

分 类 号：P597[天文地球—地球化学]