质谱精确测定新沂榴辉岩Sm-Nd同位素年龄  

Sm-Nd Ages Determination by Mass Spectrometry on Eclogite from Xin Yi

作　　者：李惠民[1] 王银喜[1] 

机构地区：[1]南京大学现代分析中心南京大学成矿作用国家重点实验室,南京210093

出　　处：《质谱学报》2000年第3期175-176,共2页Journal of Chinese Mass Spectrometry Society

基　　金：南京大学测试基金;南京大学成矿作用国家重点开放实验室基金

摘　　要：Sm-Nd dating on three eclogite bodies from Tiqiushan, Xinyi in the northern Jiansu yield the following new age results: 212, 217and 222Ma, respectively. The isochron age of three eclogites and six minerals is 217(5Ma，MSWD=0.56, (Nd(T)=-2.9. The Sm-Nd age of 217 Ma is adopted as the formation of Tiqiushan eclogite body during ultrahigh pressure metamorphism. The petrogenesis of the eclogites shows a mantle origin with a small amount of lower crustal comtaimination. The evidences show that Su ad Lu blocks used to be a part of Qinling-Dabie fold zone. The collision period between the Sino-Korean and Yangtze blocks occurred in late Triassic.Sm-Nd dating on three eclogite bodies from Tiqiushan, Xinyi in the northern Jiansu yield the following new age results: 212, 217and 222Ma, respectively. The isochron age of three eclogites and six minerals is 217(5Ma，MSWD=0.56, (Nd(T)=-2.9. The Sm-Nd age of 217 Ma is adopted as the formation of Tiqiushan eclogite body during ultrahigh pressure metamorphism. The petrogenesis of the eclogites shows a mantle origin with a small amount of lower crustal comtaimination. The evidences show that Su ad Lu blocks used to be a part of Qinling-Dabie fold zone. The collision period between the Sino-Korean and Yangtze blocks occurred in late Triassic.

关 键 词：榴辉岩 同位素年龄测定 钐 钕 质谱法 

分 类 号：P588.3[天文地球—岩石学] P597[天文地球—地质学]