大洋与大陆板内典型EM1型玄武岩的成因联系和区别  

The Genetic Relationship and Difference between Typical EM1-Type Oceanic and Continental Intraplate Basalts

作　　者：王小均[1] 陈立辉[1] 刘建强 WANG Xiao-jun;CHEN Li-hui;LIU Jian-qiang(State Key Laboratory for Mineral Deposits Research , School of Earth Sciences and Engineering, Nanjing University,Nanjing 210023 , China;College of Oceanography, Hohai University , Nanjing 210098 , China)

机构地区：[1]南京大学地球科学与工程学院内生金属矿床成矿机制研究国家重点实验室,南京210023 [2]河海大学海洋学院,南京210098

出　　处：《矿物岩石地球化学通报》2019年第2期237-247,共11页Bulletin of Mineralogy, Petrology and Geochemistry

基　　金：国家自然科学基金资助项目(41672049;41688103)

摘　　要：前人基于大洋玄武岩的放射成因同位素组成定义了DMM、HIMU、EM1和EM2等地幔端元组分。然而,自"EM1"这一概念被提出以来,有关其成因的激烈争论持续不断,EM1因此被认为是最"神秘莫测"的地幔组分。对比研究大洋和大陆板内的EM1型玄武岩可为探讨EM1组分的属性和成因提供新的制约。本文总结了笔者最近针对典型EM1型玄武岩的研究进展,比较了南太平洋EM1型洋岛玄武岩(Pitcairn)和中国东北EM1型钾质玄武岩的元素和Mg-Sr-Nd-Pb-Hf同位素地球化学特征,阐述了这两类EM1型玄武岩在成因上的联系和区别。Geochemists defined several mantle end-members including DMM, HIMU, EM1 and EM2, based on radiogenic isotopic compositions of oceanic basalts. However, since the concept of EM1 was proposed, the origin of EM1 has been intensively debated, and the EM1 is therefore considered to be the most enigmatic mantle component. The comparative study of typical EM1-type oceanic-and continental-intraplate basalts can provide new constraints on the nature and origin of EM1. In this paper, we summarize our recent research progress on typical EM1-type intraplate basalts, compared elemental and Mg-Sr-Nd-Pb-Hf isotopic geochemical characteristics between the EM1-type oceanic basalt from Pitcairn Island in South Pacific and the EM1-type potassic basalt from Northeast China, and then discuss the genetic relationship and difference between these two types of EM1 basalts.

关 键 词：EM1 洋岛玄武岩:Pitcairn 钾质玄武岩 镁同位素 含碳酸盐沉积物 

分 类 号：P588.145[天文地球—岩石学]