Jurnal Internasional Karakteristik hidro-geokimia dan isotop Sr di lembah Sungai Yalong, Dataran Tinggi Tibet bagian timur: implikasi untuk pelapukan kimia dan faktor-faktor pengendali

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Jurnal Internasional Karakteristik hidro-geokimia dan isotop Sr di lembah Sungai Yalong, Dataran Tinggi Tibet bagian timur: implikasi untuk pelapukan kimia dan faktor-faktor pengendali

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Abstract

Primary ions and isotope composition Sr. waters in the Yalong River basin in the eastern Tibetan Plateau were investigated, to explore sources of dissolved charges and controls at the level of chemical weathering. Measured radiogens 87 / 1945,900] 86 The ratio of water samples is most likely derived from weathering of metamorphic carbonates or precambrian silicate rocks. Quantitative analysis of water geochemistry shows that carbonate weathering dominates the chemical characteristics of river water. The chemical weathering rate of the entire Yalong watershed is calculated to be 7.6 ton km 1 with silicate weathering and 44.7 ton km [1945900][19452 years. ] −1 by carbonate weathering, which consumed 158.5 × 10 3 km km −2 year −1 and 885.0 × 10 3 moles of km −2 yr [1945900] −1 1945,9010] atmospheric CO 2 respectively. The highest weathering rate of carbonate (116.3 tons km] −2 in −1 ) in the Yalong River basin was observed from a basin with steep catchment slope. This highest carbonate weathering is proportional to the rate of catch in the southern Himalayas. A positive relationship was observed between the level of silicate weathering and climate control (rainfall and temperature) and topography (relief and slope). Combined climatic and tectonic effects increase silicate weathering and offset the dilution effect. However, the relationship between the level of silicate weathering and climate control and topography varies with hydrological conditions. Low-discharge rates are more closely related to climate parameters, while the rate for high-discharge catchments is more closely related to local topography.

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