MECHANISMS OF ARGON RETENTION IN CLAYS REVEALED BY LASER 4039ARAR DATING

被引：127
|
作者：
DONG, HL
HALL, CM
PEACOR, DR
HALLIDAY, AN
机构：
[1] Department of Geological Sciences, University of Michigan, Ann Arbor
来源：
SCIENCE | 1995年 / 267卷 / 5196期
关键词：
D O I：
10.1126/science.267.5196.355
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 ; 0710 ; 09 ;
摘要：
A method for dating clays is important for studies of weathering, diagenesis, hydrocarbon migration, and the formation of major metalliferous deposits. However, many attempts have produced imprecise or inaccurate results. Data from shales show that, contrary to expectations, the 40Ar-39Ar dating technique can be successfully used to determine the diagenetic age of ancient sediments because 39Ar losses during irradiation are controlled by release from low retentivity sites in illite equivalent to those that have lost radiogenic 40Ar in nature, rather than by direct recoil as is generally assumed.
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页码：355 / 359
页数：5
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