激光40Ar-39Ar测年揭示黏土中氩气保留的机制

Mechanisms of Argon Retention in Clays Revealed by Laser 40Ar-39Ar Dating.

作者信息

Dong H, Hall C M, Peacor D R, Halliday A N

出版信息

Science. 1995 Jan 20;267(5196):355-9. doi: 10.1126/science.267.5196.355.

DOI:10.1126/science.267.5196.355

Abstract

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 (40)Ar-(39)Ar dating technique can be successfully used to determine the diagenetic age of ancient sediments because (39)Ar losses during irradiation are controlled by release from low retentivity sites in illite equivalent to those that have lost radiogenic (40)Ar in nature, rather than by direct recoil as is generally assumed.

摘要

一种测定黏土年代的方法对于风化、成岩作用、烃类运移以及主要金属矿床的形成研究而言至关重要。然而，许多尝试都得出了不精确或不准确的结果。来自页岩的数据表明，与预期相反，（40）Ar - （39）Ar测年技术能够成功用于确定古代沉积物的成岩年龄，因为辐照过程中（39）Ar的损失是由伊利石中低保留率位点的释放所控制的，这些位点等同于在自然过程中已经损失了放射成因（40）Ar的位点，而不是像通常所认为的那样由直接反冲控制。