斑晶斜长石环带结构及成因研究进展  

Advances on the texture and genesis of phenocryst plagioclase zoning

作　　者：杨献忠[1,2] 周延 孙建东[1,2] 徐衍明 褚志远[3] YANG Xianzhong;ZHOU Yan;SUN Jiandong;XU Yanming;CHU Zhiyuan(Nanjing Center,China Geological Survey,Nanjing 210016,Jiangsu,China;Joint Research Center for Circum-Pacific Strategic Mineral Resources,Nanjing 210016,Jiangsu,China;The 7th Institute of Geology and Mineral Exploration of Shandong Province,Linyi 276006,Shandong,China)

机构地区：[1]中国地质调查局南京地质调查中心,江苏南京210016 [2]环太平洋战略性矿产资源联合研究中心,江苏南京210016 [3]山东省第七地质矿产勘查院,山东临沂276006

出　　处：《华东地质》2022年第4期415-427,共13页East China Geology

基　　金：中国地质调查局“华东地区钨锡钴等矿产地质调查(编号:DD20221688)”、“钦杭成矿带武宁—平江钨铜多金属矿地质调查(编号:DD20190153)”、“华北和扬子地区金刚石矿产调查(编号:DD20160059)”;山东省重大科技创新工程“隐伏金刚石矿评价理论方法与预测(编号:2017CXGC1607)”项目联合资助。

摘　　要：斜长石是岩浆岩中最常见的造岩矿物之一,受其产出的岩石类型及形成过程中的物理化学条件影响,斑晶斜长石可以发育多种环带结构,其环带成分和结构模式已被广泛应用于研究岩浆演化、反演岩浆混合作用等方面。文章将斑晶斜长石环带结构类型分为简单型环带结构、韵律型环带结构和熔蚀型环带结构三类;将熔蚀型环带结构又分为晶体内部熔蚀结构和层间晶面熔蚀结构2个亚类,绘制了晶体内部熔蚀结构中核部不同熔蚀结构、层间晶面熔蚀结构中核部边缘不同形态的素描图。归纳总结了不同类型斜长石环带结构的成因及研究进展,认为研究斑晶斜长石环带结构及核部、幔部和边部特征,对理解岩浆作用具有重要意义。Plagioclase is one of the most common rock-forming minerals in igneous rocks.Various types of zoning texture are developed in phenocryst plagioclase due to the hosted rock types and the different rock-forming physicochemical conditions.The zoning composition and texture patterns have been widely used in the study of magmatic evolution and the inversion of magma mixing.Simple zoning,rhythmic zoning and eroded zoning are defined as three types of zoning texture of phenocryst plagioclase in this paper.In terms of shape characteristics of erosion core,the eroded-type zoning texture is further divided into intracrystalline erosion texture and intercrystalline erosion texture.The different core-erosion textures in intracrystalline erosion texture and the different edge-shapes of the core in intercrystalline erosion texture are sketched out.The crystallization mechanism for different types of zoning textures of plagioclase minerals are summarized.The research on the plagioclase zoning texture and the characteristics of core,mantle and rim are significant implication for understanding magmatism process.

关 键 词：斑晶斜长石 环带结构 岩浆演化 岩浆混合作用 

分 类 号：P588.11[天文地球—岩石学]