鄂西黄陵地区太古宙变质岩La-Ce同位素体系  

La-Ce ISOTOPIC SYSTEMATICS OF ARCHEAN METAMORPHICS FROM HUANGLING, WESTERN HUBEI

作　　者：李志昌[1] 方向[1] 

机构地区：[1]地质矿产部宜昌地质矿产研究所,湖北宜昌443003

出　　处：《地球化学》1998年第2期117-124,共8页Geochimica

基　　金：地质矿产部科学技术司实验基金!85-05-040

摘　　要：测得湖北西部黄陵地区太古宙灰色片麻岩及其斜长角门岩包体的La-Ce等时线年龄（2σ）为（3292±417）Ma，εCe（t）=0，晋宁期黄陵花岗岩岩基中英云闪长岩的εCe（t）=＋07±0．1，结合Sm-Nd年龄资料，得到138La的β衰变常数为（2．41±0.12）×10－12a-1。The La-Ce isochron of Arehean grey gneisses and the amphibolites from Huangling, western Hubei Province were measured, with an age of (3292±417) Ma (2σ) and an εCe(t) value of 0. That of tonalite body in Huangling new-proterozoic granitoid batholith was also measured, its εCe(t) value is + 0.7 ± 0.1 (2σ). Combined with Sm-Nd data, the β-decay constant for 138La was estimated to be (2.41 ±0.12) ×10-12a-1.

关 键 词：镧同位素 铈同位素 灰色片麻岩 太古宙 变质岩 

分 类 号：P588.3[天文地球—岩石学] P597[天文地球—地质学]