A high spatial resolution δ18O profile of a speleothem using an ion-microprobe

被引：29

作者：

Kolodny, Y ^{[1
]}

Bar-Matthews, M

Ayalon, A

McKeegan, KD

机构：

[1] Hebrew Univ Jerusalem, Inst Earth Sci, IL-91904 Jerusalem, Israel

[2] Univ Calif Los Angeles, Dept Earth & Space Sci, Los Angeles, CA 90095 USA

[3] Geol Survey Israel, IL-95501 Jerusalem, Israel

来源：

CHEMICAL GEOLOGY | 2003年 / 197卷 / 1-4期

基金：

以色列科学基金会; 美国国家科学基金会;

关键词：

ion-probe; speleothems; oxygen isotopes; Soreq Cave;

D O I：

10.1016/S0009-2541(02)00353-4

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：

The oxygen isotopic composition of a stalactite from the Soreq Cave, Israel has been investigated by in situ high spatial resolution ion microprobe analysis. The delta(18)O record obtained on portions of the stalactite, which were deposited during the time interval of 18-14.3, 10.8-8.5 and 1.5-0.2 ka, has a temporal resolution ranging from similar to 1 to 25 years (depending on the deposition rate during the period investigated). Comparison to results obtained by micro-drilling and phosphoric acid reaction gas-phase mass spectrometry indicates that the ion microprobe analyses are precise and accurate at the 0.4-0.5 parts per thousand level. The high resolution of the ion microprobe profile enables the detection of short duration excursions toward low delta(18)O values during deglaciation (from 18 to 14.3 ka), providing further evidence indicating the instability of the glacial climate. (C) 2002 Elsevier Science B.V. All rights reserved.

引用

页码：21 / 28

页数：8

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