摘要
滇西蓝片岩的原岩为玄武质岩石和泥质岩,其矿物组合分别为Cr(或Win)+Chl±Ab+Ph+Ep±Act+Sph±Qz和Gl+Ph+Alm+Tc+Act+Chl+Qz+Do。哀牢山蓝片岩中的闪石普遍具有成分分带,核心为蓝透闪石,边缘为阳起石。澜沧江带中的蓝片岩,其碱性闪石显示了一定的成分变化,既有青铝闪石、镁钠闪石,也有蓝闪石。另外,在滇西蓝片岩中,共存的碱性闪石和钙质闪石之间存在着较大的成分间断。澜沧江带蓝片岩的变质年龄为193Ma。
Mineral assemblages and amphiboles in West yunnan blueschist have been studied in detail. There exist two mineral assemblages: Cr(or Win) ±Ab + Chl + Ph + Ep±Act +Sph±Qz for metabasite and Gl + Ph + Tc + Chl+Q2 + Do + Alm + Act for metapplite. The amphibole of Ailaoshan blueschist is commonly zoned from Winchite core to actinolite rim. In Lanchan-jiang belt the amphibole of blueschist shows a compositional variation from magnesioriebes-kite through crossite to glaucophane. Moreover, there exists compositional gap between alka-ki amphibole and actinolite, the metamorphic age of blueschist from Lanchanjiang belt is 193 Ma.
出处
《地质科学》
CAS
CSCD
北大核心
1990年第1期43-53,共11页
Chinese Journal of Geology(Scientia Geologica Sinica)
基金
国家自然科学基金(9487002)
关键词
蓝片岩
角闪石
碱性
闪石
West yunnan, blueschist, alkali amphibole, zoning
