Cong ZHANG, Dong ZHANG, Tian XUE, Songtao LIU. 0: Study on the absorption/release affect of atmospheric CO2 by pyrite weathering in the Yiluo River Basin. Geological Bulletin of China. DOI: 10.12097/gbc.2024.10.043
Citation:
Cong ZHANG, Dong ZHANG, Tian XUE, Songtao LIU. 0: Study on the absorption/release affect of atmospheric CO2 by pyrite weathering in the Yiluo River Basin. Geological Bulletin of China. DOI: 10.12097/gbc.2024.10.043
Cong ZHANG, Dong ZHANG, Tian XUE, Songtao LIU. 0: Study on the absorption/release affect of atmospheric CO2 by pyrite weathering in the Yiluo River Basin. Geological Bulletin of China. DOI: 10.12097/gbc.2024.10.043
Citation:
Cong ZHANG, Dong ZHANG, Tian XUE, Songtao LIU. 0: Study on the absorption/release affect of atmospheric CO2 by pyrite weathering in the Yiluo River Basin. Geological Bulletin of China. DOI: 10.12097/gbc.2024.10.043
The impact of sulfuric acid participating in the chemical weathering of minerals on global climate change has received much attention, but there are significant disputes regarding the weathering mechanism and the consumption of atmospheric CO₂. The Yiluo River is an important tributary in the middle reaches of the Yellow River, and there are a large number of mines such as gold, molybdenum, and silver - lead deposits distributed in its upper reaches, making it an ideal area for studying the impact of sulfuric acid weathering on the regional carbon cycle. Through spatial sampling in the wet season and the dry season, combined with hydrochemistry and sulfur - oxygen isotope analysis, the influence of pyrite oxidation in the Yiluo River Basin on the source - sink effect of atmospheric CO₂ is clarified. The results show that the proportion of pyrite oxidation in the sources of sulfate in the river water of the Yiluo River Basin is 55% in the wet season and 51% in the dry season; sulfuric acid participating in the chemical weathering of rocks in the Yiluo River Basin increases the weathering rate of the basin by 3.6%; on a long - time scale (10Ma), the CO₂ flux released by the chemical weathering of carbonate rocks with sulfuric acid derived from pyrite oxidation is 0.06×10⁵ mol·km²·a⁻¹, and the net consumption flux of atmospheric CO₂ by the rock weathering process is 0.48×10⁵ mol·km²·a⁻¹. The impact of rock weathering in the basin on atmospheric CO₂ shows a carbon sink. The research results enrich the theoretical research on pyrite weathering and the source - sink of carbon dioxide, and at the same time provide a scientific basis for water resource protection in northern China.
DownLoad: