新疆西昆仑地区阿勒玛勒克岩体岩石地球化学特征及构造环境分析

位于西昆仑北坡的阿克陶县境内的阿勒玛勒克岩体,侵位于不同时代的黑色岩系中,由早期到晚期可以识别出蚀变闪长岩→蚀变石英二长岩（或石英闪长岩）→细晶闪长岩及粗晶—伟晶角闪二长岩→长石伟晶岩4期岩浆活动。里特曼指数（σ）为2.82—6.87,属于偏碱性钙碱系列 各岩类的主要岩石化学指数并未随着w（SiO2）的变化,而有规律地变化,这表明各岩类属于不同源岩浆序列。岩石地球化学特征及各类图解表明,阿勒玛勒克岩体为幔源型至壳—幔混熔型岩浆岩,是晚华力西—早印支期造山带碰撞抬升到造山晚期的岩浆活动的产物。

Geochemical characteristics and tectonic environment analysis of alemaleke rock mass in western Kunlun area,Xinjiang

Alemaleke rock mass,located in Aketao county, northern slope of Western Kunlun mountain,intruded Black shale series of Various era. Four stages of magmatic impulsive activities can be recognized：the altered diorite, altered quartz monzonite （ quartz diorite）, diorite and am- phibolite monzonite and feldspar pegmatitiefrom Early to late periods. Their cr is 2. 82-6. 87, and they belong to ealc-alkali series. Their main petrochemical parameters have not regular changes with the variety of SiO2 content which evidenced differentiate evolution features of consanguinity clearly. It is indicated by geochemical data and diagram that Alemaleke rock mass is rnanfle source-crust- manfle source granite,and is magmatie activities outcome from late variscan -early indosinian period orogenic belt ellide.