闽北早古生代岛弧火山岩的岩石地球化学特征  

PETROCHEMICAL AND GEOCHEMICAL CHARACTERISTICS OF EARLY PALEOZOIC ISLAND-ARC VOLCANIC ROCKS IN NORTHERN FUJIAN PROVINCE

作　　者：陈汉林[1] 曾华生[1] 杨树锋[1] 武光海[1] 

机构地区：[1]浙江大学地球科学系,杭州310027

出　　处：《矿物学报》1994年第2期186-194,共9页Acta Mineralogica Sinica

基　　金：国家自然科学基金

摘　　要：作者系统地研究了福建政和早古生代岛弧火山岩的岩石地球化学特征。研究表明该火山岩是以岛弧拉斑玄武岩-钙碱性火山岩组合为特征的岛弧火山岩系列，并具有从拉斑系列向钙碱性系列演化的特征；该火山岩源于亏损地幔，并且受到一定的陆壳物质混染，基性的拉斑玄武质系列受到陆壳物质混染较少，而中性钙碱性系列则受到较大程度混染。The petrochemical and geochemical characteristics of Early Paleozoic volcanic rock series in Zhenhe, Fujian Province were systematically described. Studies show that it is a tholeiite-calc-alkali island-arc volcanic rock (IAVR) series evolving from tholeiite series to calc-alkali series. The Rb-Sr isochron age of the island-arc volcanic rocks is 560±1 4 Ma. This IAVR series came from a depleted mantle, but was mixed with a small amount of crustal material; the tholeiite series was mixed with little crustal material, but calc-alkali series was mixed with more crustal material The discovery of the Zhenhe Early Paleozoic IAVR series is of great importance in the study of the tectonic evolution in southeastern China.

关 键 词：古生代 火山岩 岩石地球化学 

分 类 号：P588.14[天文地球—岩石学]