Sulfur isotopic tracing of river sulfate (SO42-) suggests that sulfide oxidation accounts for 85 7% of the dissolved SO 42- in one of the largest river systems (the Kaoping) of the Taiwan orogeny in the high-discharge season. This corresponds to a basin-wide contribution of ∼1.2-1.6% of pyrite-derived SO4 2- exported by rivers globally, from a river basin, which is only ∼0.003% of the global drainage area. Intense rainfall, high relief and active tectonics all favor intense physical weathering of the Kaoping basin, which promotes continuous exposure of fresh (sulfide) mineral surfaces for oxidative weathering. This coupling between physical and chemical weathering sustains disproportionately high sulfide oxidation, ∼400 times relative to surface area, in the Kaoping basin.
All Science Journal Classification (ASJC) codes
- Earth and Planetary Sciences(all)