Ge/Si and 87Sr/86Sr tracers of weathering reactions and hydrologic pathways in a tropical granitoid system

被引：20

作者：

Derry, LA ^{[1
]}

Pett-Ridge, JC

Kurtz, AC

Troester, JW

机构：

[1] Cornell Univ, Dept Earth & Atmospher Sci, Ithaca, NY 14853 USA

[2] Boston Univ, Dept Earth Sci, Boston, MA 02215 USA

[3] US Geol Survey, Caribbean Water Sci Ctr, Guaynabo, PR 00965 USA

来源：

JOURNAL OF GEOCHEMICAL EXPLORATION | 2006年 / 88卷 / 1-3期

基金：

美国国家科学基金会;

关键词：

germanium; silica; Ge/Si; strontium isotopes; weathering reactions; hydrograph separation;

D O I：

10.1016/j.gexplo.2005.08.054

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：

Ge/Si and Sr-87/Sr-86 data from primary and secondary minerals, soil waters, and stream waters in a tropical granitoid catchment quantitatively reflect mineral alteration reactions that occur at different levels within the bedrock-saprolite-soil zone. Near the bedrock-saprolite interface, plagioclase to kaolinite reaction yields low Ge/Si and 87Sr/86Sr. Higher in the regolith column, biotite weathering and kaolinite dissolution drive Ge/Si and 87Sr/86Sr to high values. Data from streams at base flow sample the bedrock-saprolite interface zone, while at high discharge solutes are derived from upper saprolite-soil zone. Coupled Ge/Si and 87Sr/86Sr can be effective tools for quantifying the importance of specific weathering reactions, and for geochemical hydrograph separation. (c) 2005 Elsevier B.V. All rights reserved.

引用

页码：271 / 274

页数：4

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