当前位置：
X-MOL 学术
›
Chem. Geol.
›
论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Granite weathering profiles accumulate vegetation-derived mercury
Chemical Geology ( IF 3.9 ) Pub Date : 2024-05-01 , DOI: 10.1016/j.chemgeo.2024.122056 Di Chen , Chengshuai Liu , Ting Gao , Bizheng Yang , Sae Yun Kwon , Runsheng Yin
Chemical Geology ( IF 3.9 ) Pub Date : 2024-05-01 , DOI: 10.1016/j.chemgeo.2024.122056 Di Chen , Chengshuai Liu , Ting Gao , Bizheng Yang , Sae Yun Kwon , Runsheng Yin
Weathering of silicate rocks, particularly granitic rocks, generates the pedosphere that is of crucial importance in functioning terrestrial ecosystems. The pedosphere hosts large amounts of mercury (Hg). The source of Hg in granite weathering products is currently poorly constrained, however. Here we conducted Hg isotopic analyses on two weathering profiles developed on granitic plutons in Central and South China. Soils from both profiles show a downward decrease in Hg concentration but consistently negative ∆Hg values. Mercury in precipitation, granites, and vegetation display positive, near-zero, and negative ∆Hg values, respectively. The negative ∆Hg values in the two weathering profiles are consistent with estimates of vegetation-derived Hg, supporting that Hg in weathering profiles are dominantly sourced from vegetation. Hg in vegetation is transported into surface soil firmly bonded to organic matter and migrates downwards weathering profiles. This study provides insights into the biogeochemical cycle of Hg in the granite-weathering crust and helps to explain the negative ∆Hg values observed in terrestrial-derived sedimentary rocks.
更新日期：2024-05-01
京公网安备 11010802027423号