摘要
北秦岭豫西马驹口地区宽坪岩群中的斜长角闪岩原岩为基性侵入岩（ 辉长岩） ，其全岩的Ｓｍ－Ｎｄ 同位素等时线年龄为７４７－７２±４３Ｍａ，钕同位素初始比值为εＮｄ（ｔ） ＝ － ０．１ ，表明该基性侵入岩形成于晚元古代晚期，岩石来源于亏损的上地幔源区，但岩浆在形成和侵位过程中遭受不同程度的地壳物质成分的混染。
The initial rock of amphibolite in the Kuanping Terrane of West Henan Majukou areas in North Qinling is a basic intrusive rock(gabbro),and its isotime line age of whole rock Samarium(Sm)-Neodymium(Nd) isotope is 747.72±43Ma,and the initial Neodymium isotope ratio is ε Nd (t)= -0.1 It has indicated that the basic intrusive rock formed in the late Late Proterozoic,the rock originated from the depleted upper mantle source region and the magma has suffered from differential pollution of crustal mass composition in the course of the form and emplacement.
出处
《河南地质》
1999年第4期278-282,共5页
Henan Geology
关键词
基性侵入岩
斜长角闪岩
钐-钕同位素
年龄
North Qinling
Kuanping Terrane
basic intrusive rock
Samarium-Neodymium isotime line
