Petrology and high-pressure mineral assemblage of maflc-ultramaflc rocks of ultrahigh-pressure metamorphic zone in the Dabie Mountains  

作　　者：樊祺诚 刘若新 张旗 赵大升 马宝林 李齐 

机构地区：[1]Institute of Geology. State Seismological Bureau. Beijing 100029, China [2]Institute of Geology. Chinese Acamedy of Sciences.Beijing 100029.China

出　　处：《Science China Earth Sciences》1996年第3期329-336,共8页中国科学（地球科学英文版）

基　　金：Project supported by the National Natural Science Foundation of China.

摘　　要：The relation between edogite and mafic-ultramafic rocks of Maowu, Bixiling and Nanshanling in Dabie Mountains represents three different kinds of occurrence relations. Their protoliths are bedded cumulate formed by crystallization differentiation of basic magma, which experienced ultrahigh-pressure metamorphism under the mantle condition at the depth of more than 120- 150km during the colli-sion-subduction between the Yangtze Plate and North China Plate. Ti-dinohumite + Ti-chondrodite + magnesite + Al-poor pyroxene is the typical high-pressure mineral assemblage of mafic-ultramafic rocks which reveals the participation of H2O, CO2 and other volatiles-containing fluid in the ultrahigh-pressure metamorphism.The relation between edogite and mafic-ultramafic rocks of Maowu, Bixiling and Nanshanling in Dabie Mountains represents three different kinds of occurrence relations. Their protoliths are bedded cumulate formed by crystallization differentiation of basic magma, which experienced ultrahigh-pressure metamorphism under the mantle condition at the depth of more than 120- 150km during the colli-sion-subduction between the Yangtze Plate and North China Plate. Ti-dinohumite + Ti-chondrodite + magnesite + Al-poor pyroxene is the typical high-pressure mineral assemblage of mafic-ultramafic rocks which reveals the participation of H2O, CO2 and other volatiles-containing fluid in the ultrahigh-pressure metamorphism.

关 键 词：DABIE MOUNTAINS mafic-ultramafic rock high-pressure mineral assemblage. 

分 类 号：P584[天文地球—岩石学]