摘要
北京市密云、怀柔、平谷和昌平地区太古宙岩石可划分为混合岩化表壳岩系和非层状岩系两大类岩石、地层单元。前者包括大港一沙厂混合岩化表壳岩系和四合堂混合岩化表壳岩系；后者主要为TTG（A）-M-Me杂岩，它包括苇子峪、阳坡地、马圈子、对角沟门和冯家峪等杂岩。太古宙表壳岩系的原岩建造有杂砂岩＋英安质、安山质火山岩及其碎屑岩＋铁硅质沉积岩建造，含铁进质宕的绿岩建造和绿岩建造三类。表壳岩系区域变质作用和太古宙TTG质岩形成的时代均发生于新太古代。推测大港-抄厂表壳岩系及苇子峪TTG（A）－M-Me杂岩中的主体表壳宕系成岩时代为中太古代晚期，其它TTG－M－Me杂老中的表壳岩系成岩时代为新太古代早期。
The Archean rocks can be subdivided into two units of stratum-Rock: Themigmaized supracrustal rock series and nonstratified rock series in the Miyun- Huairou - Pingguarea, Beijing. Th fomer covers the Sihetang supracrustal rock series mtwtized and Dacacrshachang supracrustal rock series migInaized; The later rnainly consists of the Weisiyu ere(A)-M - Me comlex, Yanoti TTG - M - Me comlex, Majuanzi TTG - M - Me comlex,Duijiaogoumen TTG - M - Me comlex and Fengjiayu TTG - M - Me comlex and so on. Thereare three original rock formations of the Archean supracrustal rock series in this region: ①Graywacke+ dacitic-andesitic volcanic rocks and its pyroclastic rocks + ferruginous silicolite, ②Ferruginous silicolitebearing greenstone, ③Greenstone. Both the regional metamorphisrn of thesupracurstal rock series and the foaretion of Archean rm took place during Neoarchean. Thelithognetic ag6s of the Dacacrshachang supracrustal rock series and the main supracrustal rockseries in the Weiziyu TTG(A) - M - Me comlex are suppose in the later stage of Marerchean;The libonetic age of the supracrustal rock series in the other TTG - M - Me comlexes isthought in the early stage of Neoarchean.
出处
《前寒武纪研究进展》
1999年第2期1-10,共10页
Progress in Precambrian Research
基金
原地质矿产部"九五"科技专项
!96-23
