Meteorite phosphates show constant 176Lu decay rate since 4557 million years ago

被引：93

作者：

Amelin, Y ^{[1
]}

机构：

[1] Geol Survey Canada, Ottawa, ON K1A 0E8, Canada

来源：

SCIENCE | 2005年 / 310卷 / 5749期

关键词：

D O I：

10.1126/science.1117919

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 [理学]; 0710 [生物学]; 09 [农学];

摘要：

The use,of radioactive decay of Lu-176 to Hf-176 to study the evolution of the Earth requires a precise and accurate value for the Lu-176 decay constant. Recent determinations of this decay constant by age comparison to the more precisely calibrated U-Pb isotopic system produced internally consistent but discrepant values between terrestrial minerals and meteorites. New highly radiogenic Lu-Hf data for phosphate minerals from Richardton (ordinary chondrite) and Acapulco (primitive achondrite) yield decay constant values of 1.864 x 10(-11) +/- 0.016 x 10(-11) and 1.832 x 10(-11) +/- 0.029 x 10(-11) year(-1), respectively, identical to the value determined from terrestrial minerals.

引用

页码：839 / 841

页数：3

共 26 条

[1]

ALBAREDE F, IN PRESS GEOCHIM COS

[2]

Geochemical test for branching decay of 176Lu [J].