摘要
辽西早太古宙变质杂岩是由85%～90%长英质片麻岩(主要是英云闪长岩—花岗间长岩—花岗岩组合(简称TTG)的深成花岗杂岩)和10%～15%上壳岩(包括层状火山—沉积岩、脉岩及基性超基性侵入岩等)组成.斜长角闪岩和基性麻粒岩可与世界变质拉斑玄武岩对比.TTG岩石可能由中酸性岩浆与围岩熔融而成.麻粒岩相是中压区域高温变质作用的产物,变质作用的演化为退变质、近等压冷却(IBC)反时针型的PTt轨迹.
The early Archaeozoic metamorphic complex in the west of Liaoning consists of 85%-90% of felsic gneiss including mainly pluntonic granitic complex with quartz diorite-granodiorite-granite (TTG) assemblage,and 10%~15% of upper crust rock including layered volcanic-sedimentary rock,dike rock and basic-uitrabasic instrusives. The amphibolite and basic granulite may be comparable to the world's metamorphic tholeiite. TTG rocks may be formed through the smelting of intermediate-acidic magma with country rocks. The granulite facies were resulted from the regional high-temperature metamorphism with medium pressure. The metamorphism evolution was the retrogressive metamorphism with approximate isobaric cooling (IBC) and counter clockwise PTt path.
出处
《矿产与地质》
1993年第1期49-55,共7页
Mineral Resources and Geology
关键词
变质作用
麻粒岩
PTT轨迹
杂岩
Metatnorphism,Granulate,PTt path,The west of Liaoning
