【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。更多还原

【Abstract】 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.更多还原