摘要
苏北超高压变质带是秦岭—大别造山带的东延部分,所产出的榴辉岩有三种类型,分别为产于片麻岩中的G类榴辉岩、产于大理岩中的M类榴辉岩和产于蛇纹岩中P类榴辉岩。地球化学研究表明,三类榴辉岩的原岩复杂多样,源岩为下地壳或上地幔的基性-超基性岩,兼具大陆和大洋玄武岩的特征,富含TiO2等有用组分,是金红石矿床的成矿母岩。金红石矿床的形成是华北、扬子两大板块俯冲碰撞的结果,金红石成矿作用的强弱与岩性、构造、变质变形作用等密切相关。榴辉岩中含有金红石、钛铁矿、磷灰石、石榴子石、绿辉石等多种有用矿物,具有较高的综合利用价值。
The northern Jiangsu ultrahigh-pressure metamorphic belt is the eastern extending portion of the Qinling-Dabieshan Orogenic Zone. According to the country rocks,the eclogites occurring in this belt can be classified into three types： G-type in gneiss, M-type in marble and S-type in serpentinite. Geochemical characteristics of eclogites show that their original rocks are complicated and related to mafic-ultramafic rocks derived from the lower crust or upper mantle with properties of both continental and oceanic basalts. The eclogites contain useful compositions and are host rocks of rutile etc. deposits. Mineralization of rutile in eclogites is mainly related to subduction and collision of the North China Plate with the Yangtze Plate and controlled by characteristics of lithology, deformation, and metamorphism. The eclogites contain many valuable minerals such as rutile, ilmenite, apatite, garnet, omphacite and thus have high economic significance for comprehensive utilization.
出处
《高校地质学报》
CAS
CSCD
北大核心
2010年第3期265-280,共16页
Geological Journal of China Universities
基金
国家攀登计划预选项目(95-预-93)
国家地质大调查项目(200210300004)联合资助
关键词
超高压变质带
榴辉岩
地球化学
综合利用
Ultra-highpressure metamorphic belt
eclogite
geochemistry
mineralization
comprehensive utilization
