赣中变质岩带变质带的重新划分及变质作用P-T条件的确定  

REDIVISION OF THE METAMORPHIC FACIES ZONATION AND DEFINITION OF METAMORPHISM P-T OF METAMORPHIC ROCKS BELT IN CENTRAL JIANGXI PROVINCE

作　　者：胡恭任[1] 于瑞莲[1] 

机构地区：[1]华侨大学环境科学与工程系

出　　处：《化工矿产地质》2004年第2期65-75,共11页Geology of Chemical Minerals

基　　金：福建省自然科学基金(D0310017);南京大学内生金属矿床成矿机制研究国家重点实验室开放基金和华侨大学博士科研起动资金联合资助项目

摘　　要：根据随变质作用增强而出现的特征变质矿物及矿物组合,对赣中变质岩带重新划分出五个变质带,由低到高依次为绢云母一绿泥石带、黑云母带、铁铝榴石带、十字石带、夕线石带。在对各变质带变质矿物进行详细研究的基础上,采用石榴石-黑云母(Gt-Bi)、斜长石-角闪石(Pl-Hb)、石榴石-十字石(Gt-St)、石榴石-角闪石(Gt-Hb)、石榴石-斜长石-夕线石-石英(Gt-Pl-Sil-Q)、石榴石-斜长石-黑云母-白云母(Gt-Pl-Bi-Mu)等多种地质温压计确定了各变质带的形成温度、压力,绢云母-绿泥石带的形成温度为250-350℃,压力为0.25-0.35GPa;黑云母带的形成温度为350-450℃±,压力为0.25-0.40GPa±;铁铝榴石带的形成温度为450-550℃±,压力为0.40～0.60GPa±;十字石带的形成温度为550-600℃±,压力为0.50-0.60GPa±;夕线石带的形成温度为600-650℃±,压力为0.55-0.65GPa±,赣中变质岩带峰期变质作用已达到角闪岩相。The metamorphic rocks belt in central Jiangxi province went through complex and more than one metamorphism and deformation. With the increase of metamorphic degree and appearance of typical metamorphic mineral from south to north, the metamorphic rocks belt in central Jiangxi province can be subdivided into five metamorphic zones :sericite-chlorite zone, biotite zone, almandite zone, staurolite zone and silicon zone. The author made systematic research to metamorphic minerals of five metamorphic zones. Base on the study above,the metamorphic temperature and pressure of five metamorphic zones have been determined from garnet-biotite, garnet-hornblende,garnet-staurolite, plagioclase-hornblende, garnet plagioclase-Al2SiO5-quartz , garnet-plagioclase-biotite-muscovite geothermornetry and geobarometry, respecti-vely being 250-350 ℃± 、 0.20-0.30GPa ± ;350-450 ℃ ± 、 0.25-0.40GPa ± ;450-550 ℃ ± 、 0.40-0.60GPa±;550-600℃ ± 、 0.50-0.65GPa±;600-650℃ ± 、 0.50-0.65GPa±, which suggest that peak times metamorphism have reached amphibolite-facies metamorphic rocks belt in central Jiangxi province

关 键 词：递增变质带 变质矿物 地质温压计 赣中变质岩带 

分 类 号：P588.3[天文地球—岩石学]