赣中盛源盆地及邻区橄榄玄粗岩系列火山岩中黑云母化学成分特征

Chemical composition of biotite of shoshonite volcanic rock series from Shengyuan basin and its adjacent area

本文利用电子探针技术对赣中盛源盆地及邻区橄榄玄粗岩系列火山岩中黑云母的类型、化学成分及结晶时的温度和氧逸度条件等进行了研究。黑云母为镁质黑云母;结晶时温度的大致范围为1 060°C^1 100°C,氧逸度大致范围为1-0 7bar^1-0 9bar。本文研究表明,黑云母的化学成分研究是揭示岩石成因类型的一种有效途径,可为研究岩体成因类型以及成岩时的物理化学条件提供依据,并对成岩具有重要的指示意义。

This paper presents a systematic study on the type, chemical composition, temperature condition and oxygen fugacity during crystallization of biotite of shoshonite volcanic rock series from Shengyuan basin and its adjacent area by using of electron probe microanalysis technique. The biotite is of Mg-biotite type, the crystallization temperature is about 1 060℃-1 100℃ and the oxygen fugaeity is about 10^-7 bar-10^-9 bar. The present study indicates that the study on the chemical composition characteristics of biotite is an effective way to reveal the genesis types of rocks and can provide information to discuss the genesis and physieo-chemical condition of magmas, which have important indicator significance in the diagenesis.