云南景洪南联山橄榄岩-闪长岩型岩体的特征及地质意义  

THE CHARACTERISTICS AND GEOLOGICAL SIGNIFICANCE OF THE PERITOTITE-DIORITE TYPE OF BODY IN NANLIANSHAN, JINGHONG COUNTY,YUNNAN PROVINCE

作　　者：张魁武[1] 张旗[1] 李达周[1] 王明新[2] 赵大贤 徐顺荣 

机构地区：[1]中国科学院地质研究所,北京100029 [2]云南省地矿局第五地质大队,思茅665000

出　　处：《矿物岩石》1991年第3期21-28,共8页Mineralogy and Petrology

摘　　要：岩相学和地球化学特征表明,南联山岩体是岩浆侵位的,岩石的分布显示环带构造;从中心向外依次为角闪橄榄岩、辉绿(辉长)岩和闪长岩。它们的结构和化学特征指示,这些岩石是由辉长-闪长岩质的岩浆结晶分异作用而形成的,角闪橄榄岩和部分辉绿岩为堆晶岩,其它的岩石为堆晶作用后分异而成的岩浆共结结晶作用所形成。原始岩浆的成分类似于高铝玄武岩和(或)玄武质安山岩。The Nanlianshan igncous complex, according to its parographies and geochemistries, was magmatically emplaced and shows a concentric zone in rock distribution: bornblende-peridotite, diabase (gabbro)and diorite from the core to margin successively. Characteristics of structure and chemistry of the pluton suggests that the rocks are derived from a gabbroic-dioritic magma by crystal differentiation, ultramafic rocks and a few of diabases formed by cumulation of early crystallized mafic minerals, and the other rocks crystallized from a magma formed after cumulation by eutectic crystallization. Parental magmas are somilar, in composition, to that of high-Al basalt and (or) basaltic andesite.

关 键 词：橄榄岩 闪长岩 岩体 超镁铁岩 

分 类 号：P588.125[天文地球—岩石学]