巴楚瓦吉里塔格火成杂岩体岩石学研究

摘要

根据地质学、岩石学、地球化学研究，确定瓦吉里塔克火成杂岩体由3部分组成：层状岩体、角砾岩岩筒和晚期脉岩，其形成的年龄分别为357.9～306Ma、252.7Ma、231.3Ma。证实层状岩体为岩浆房原地分离结晶作用形成，具有碱性岩浆的肯尼迪演化趋势并发育液态不混溶作用，最终形成具有实际矿物霞石的过碱性岩。确定角砾岩筒并非金伯质，实为角砾云母橄辉岩。确定晚期脉岩与角砾云母橄辉岩为同期岩浆活动的产物，而且均发生在层状岩体固结之后。此外，根据它们富含H2O和富集大离子亲石元素的特点推测，该岩浆来源于富含流体相且不同于层状岩体的源区。%based on reseach on geology.Petrology Geochimistry andgeochronology this paper determines that the Wajilitag igneous complex body is composed of three parts: the super mafic-mafic layer dody; the rock thic of brecciated Mica-olivine pyroxenite and ; later alkalic dike,their age is 306~357.9 Ma, 252.7 Ma and 231.3 Ma, espectively.It indicated that layer body reseult from fractional crystallization in sutu;Showed that alkaline magma is a kennedy's evolution frmed peralkaline rocks with nepheline mode.We presume that thic of brecciated rocks in not Kimberlitic quality but is brecciated mica-olivine pyroxenite.We recognize that later vein rocks and brecciated mica-olivine Pyroxenite is a product of contemporaneous magmutizm beror solidification of layer body.Besids this;based on their aundance in H2O and LIL we determines that magma result from source abundance in flud phase and it is different form layer body.