Iron valence in the hydration layer of obsidian: characterization by X-ray absorption spectroscopy

被引：2

作者：

Lytle, FW ^{[1
]}

Pingitore, NE

机构：

[1] EXAFS Co, Pioche, NV 89043 USA

[2] Univ Texas, Dept Geol Sci, El Paso, TX 79968 USA

来源：

MICROCHEMICAL JOURNAL | 2002年 / 71卷 / 2-3期

基金：

美国国家卫生研究院; 美国国家科学基金会;

关键词：

obsidian; hydration; age dating; X-ray absorption spectroscopy; iron valence;

D O I：

10.1016/S0026-265X(02)00010-3

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

We used a combined fluorescent X-ray and electron yield measurement of the Fe K-edge X-ray absorption near edge structure (XANES) of Modena obsidian to determine the original valence, Fe2+, and change in valence to Fe3+ during atmospheric hydration. We believe this to be the first observation of the valence change of Fe during the hydration of obsidian. The combination of the spectra measured with the electron channel and the X-ray channel resulted in apparent sensitivity from hours to geologic time. The technique may prove useful in age dating archaeological and geological specimens of obsidian. (C) 2002 Elsevier Science B.V. All rights reserved.

引用

页码：185 / 191

页数：7

共 14 条

[1]

BECK C, 1992, CURR RES PLEISTOCENE, V10, P54

[2] DEPTH DEPENDENCE FOR EXTENDED X-RAY-ABSORPTION FINE-STRUCTURE SPECTROSCOPY DETECTED VIA ELECTRON YIELD IN HE AND IN VACUUM [J].