GeochronologyofasurfacecoreinthenorthernbasinofLakeQinghai:Evidencefrom210Pband137Csradionuclides

被引：12

作者：

徐海

艾莉

谭亮成

安芷生

机构：

[1] StateKeyLaboratoryofLoessandQuaternaryGeology,InstituteofEarthEnvironment,ChineseAcademyofSciences

来源：

Chinese Journal of Geochemistry | 2006年 / 04期

关键词：

210Pb; 137Cs; depth sedimentation rate; mass accumulation rate; Lake Qinghai;

D O I：

暂无

中图分类号：

P597.3 [];

学科分类号：

070902 ;

摘要：

The radioactivities of 210Pb and 137Cs have been measured to estimate the dates of the sediments of a surface core （QH0407-C-2） in the northern basin of Lake Qinghai. The sedimentation rate derived from 210Pb radioactivity correlates well with that inferred from （137）Cs radioactivity. The dates calculated from depth sedimentation rate （cm/a） are similar to those derived from mass accumulation rate （g·cm-2·a-1） between 0-5 cm, but are significantly different below 5 cm, which has been ascribed to the compaction of surface sediments during early diagenesis. The dates derived from mass accumulation rate are consistent with those calculated from the AMS 14C dating model. The precipitation-controlled indices based on the chronology data derived from mass accumulation rate are similar in trends to the precipitation reconstructed from tree rings in adjacent region, which further verifies the reliability of the geochronology data.

引用

页码：301 / 306

页数：6

共 3 条

[1]

A carbon- and oxygen-isotope record of recent environmental change from Qinghai Lake, NE Tibetan Plateau[J] . A. C. G. Henderson,J. A. Holmes,Jiawu Zhang,M. J. Leng,L. R. Carvalho.Chinese Science Bulletin . 2003 (14)

[2]

High-resolution precipitation variations in the Northeast Tibetan Plateau over the last 800 years documented by sediment cores of Qinghai Lake[J] . Jiawu Zhang,Ming Jin,Fahu Chen,R. W. Battarbee,A. C. G. Henderson.Chinese Science Bulletin . 2003 (14)

[3]

210Pb and 137Cs dating methods in lakes: A retrospective study[J] . Gaboury Benoit,Tim F. Rozan.Journal of Paleolimnology . 2001 (4)

← 1 →