鄂东北大别杂岩中深熔混合岩存在的地质地球化学证据  

GEOLOGICAL AND GEOCHEMICAL EVIDENCES FOR DISCRIMINATING ANATECTIC AND SUBSOLIDUS MIGMATITES IN DABIE COMPLEX, NORTHEASTERN HUBEI PROVINCE

作　　者：王江海[1] 游振东[1] 韩郁菁[1] 陈云兰[1] 

机构地区：[1]中国科学院广州地球化学研究所,中国地质大学

出　　处：《地球化学》1995年第4期359-367,共9页Geochimica

基　　金：国家自然科学基金

摘　　要：基于地质地球化学研究结果提出识别大别杂岩中深熔混合岩的证据：①浅色体粗大可横切面理，伴有复杂褶皱，帮体发育；②浅色体和古成体中斜长石牌号有明显差异；③矿物成分和组合指示曾达到深熔条件；④浅色体中富含Ａｌ２Ｏ３、Ｆｅ２Ｏ３、ＴｉＯ２和不活动、不相容元素，如ＬＲＥＥ、Ｔｈ、Ｈｆ、Ｚｒ。最后结合混合岩矿物空间分布和质量平衡研究结果得出结论：大别核心杂岩中混合岩的主导成因机制是深熔。The evidences for presence of anatectic migmatites include the following: (l)leucosome with characteristic width thicker than those of subsolidus genesis, cutting across the foliation, developing complicated folds and wide selvages, (2) the marked differences in the number of plagioclase between the paleosome and the leucosome,(3) the mineral compositions and assemblages showing the temperature and pressure conditions up to the onset of anatexis; (4)Al2O3, Fe2O3, TiO2, and immobile and incompatible elements (such as LREE, Th, Hf and Zr) enriched in the leucosome.Combining with the mineral spatial distribution and mass balance, it is concluded that anatexis is the key mechanism for the formation of migmatites in Dabie Core Complex.

关 键 词：深熔混合岩 地质地球化学 大别杂岩 杂岩 

分 类 号：P588.36[天文地球—岩石学]