A COMPARISON OF RADIOCARBON AND U/TH AGES ON CONTINENTAL CARBONATES

被引：15

作者：

FONTES, JC

ANDREWS, JN

CAUSSE, C

GIBERT, E

机构：

来源：

RADIOCARBON | 1992年 / 34卷 / 03期

关键词：

D O I：

10.1017/S0033822200063888

中图分类号：

P3 [地球物理学]; P59 [地球化学];

学科分类号：

0708 ; 070902 ;

摘要：

Authigenic micrite from a playa in the northern Sahara has been dated by both the U/Th and C-14 methods. The U/Th ages can be a few thousand years greater or less than the C-14 ages obtained on the smallest crystals of micrite. The latter are considered to form a reasonable chronology for the Holocene deposits. The deviations of the U/Tb ages are explained by quantifiable losses and gains of uranium under changing redox conditions. Under conditions where U is conservative (reduced sediments with low permeability), the U/Th method can provide good chronologies for lacustrine deposits.

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页码：602 / 610

页数：9

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