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 and geochronology 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.
出处
《新疆地质》
CAS
CSCD
2001年第1期38-42,共5页
Xinjiang Geology
基金
国家305项目!(969150405)
