【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。更多还原

【Abstract】 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.更多还原