西昆仑中带库科西鲁克侵入岩地球化学特征及构造环境

Geochemical Characteristics and Tectonic Setting of the Kukexiluke Intrusion in Middle West Kunlun Mts

通过西昆仑中带库科西鲁克侵入岩的地质学、岩石学、地球化学等研究表明,岩石以亚碱性系列为主,轻重稀土均有分异,但轻稀土更明显,且有富集。δEu轻度正异常-亏损,大离子亲石元素Ba、Th、Sr富集,Rb亏损,具有同源岩浆的特征和一致的岩浆演化性质,含有较多的中下地壳成分,受到大量地壳物质的混染。通过对岩浆岩形成的构造环境进行综合分析,提出西昆仑中带库科西鲁克岩体主要形成于岛弧构造环境。

A study of geology, petrography and geochemistry for the Kukexiluke intrusion indicates that most of rocks belong to sub-alkaline series with enrichment in LREE and LILE such as Ba, Th and Sr and depletion in Rb which is characteristic of cognate rock with contamination from the lower crust. The study indicates that the intrusion was emplaced in an island arc setting.