|Table of Contents|

Review on Chemical Weathering Within a Drainage Basin Traced by Mg Isotopes(PDF)

《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]

Issue:
2023年第04期
Page:
953-965
Research Field:
环境与可持续发展专刊
Publishing date:

Info

Title:
Review on Chemical Weathering Within a Drainage Basin Traced by Mg Isotopes
Author(s):
WANG Ruo-wen1; 2;  GAO Quan-zhou1; 2; 3*
(1. School of Geography and Planning, Sun Yat-sen University, Guangzhou 510006, Guangdong, China; 2. Guangdong Key Laboratory for Urbanization and Geo-simulation, Sun Yat-sen University, Guangzhou 510006, Guangdong, China; 3. Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai), Zhuhai 519080, Guangdong, China)
Keywords:
Mg isotope;  non-traditional stable isotope;  fractionation;  chemical weathering;  carbon cycle;  geochemistry;  tracer application;  river
PACS:
P595
DOI:
-
Abstract:
The potential of river Mg isotope systems to trace continental chemical weathering processes has been emphasized in recent years. The geochemical behavior of Mg isotopes in the surface process of the watershed was summarized. The results show that river Mg is mainly derived from mineral chemical weathering, atmospheric precipitation, groundwater and plant debris. Mg isotopic composition of the world's major runoff shows great variability, which is difficult to fully explain by the conservative mixing of Mg reservoirs in the basin alone, because the differential weathering of bedrock and Mg isotope fractionation during continental chemical weathering is important influencing factor of Mg isotopic composition in river water. The main fractionation processes affecting Mg isotopic composition in river water include primary mineral decomposition, secondary mineral formation, adsorption-desorption of exchangeable states, plant uptake and debris release. At present, the primary control process of river Mg isotope system is still not well understood. On a global scale, Mg isotopic composition of large rivers correlates well with the chemical weathering strength of carbonate minerals. In addition, multi-isotopic systems such as Mg-Sr, Mg-Li, Mg-Ca and Mg-O also provide powerful tracing tools for the study of surface environment evolution. In the future, the discussion on Mg isotope fractionation factors, special chemical weathering types, multi-isotope coupling combination and quantitative tracing of Mg isotopes in key processes in river basins should be strengthened, and the application of river Mg isotopes in chemical weathering in river basins should be promoted.

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Last Update: 2023-06-20