Hydrogeochemistry, Geothermometry, and Genesis of the Hot Springs in the Simao Basin in Southwestern China

Figure 1

Geological map in the Simao Basin (modified from [16]). (a) Occurrence of strata and faults in the Simao Basin: 1: Quaternary gravel and clay; 2: Neogene mudstone and fine sandstone; 3: Paleogene salt-bearing gompholite and sandstone; 4: Cretaceous quartz sandstone, siltstone, and mudstone; 5: Jurassic mudstone, siltstone, and gypsum; 6: Triassic limestone, shale, mudstone, and siltstone; 7: Permian limestone, mudstone, siltstone, and tuff; 8: Carboniferous limestone, shale, and tuff; 9: Devonian marl, mudstone, shale, and siltstone; 10: Silurian silicolites, shale, quartz sandstone, and siltstone; 11: Ordovician clastic rocks with limestone; 12: Proterozoic gneiss, granulite, schist, and marble; 13: granite; 14: quartz monzonite; 15: gabbro; 16: magnesian ultramafic rock; 17: quartz syenite; 18: fault; 19: river; 20: spring; 21: international boundary. (b) Tectonic division in the Simao Basin: 1: Sanjiang fold system; 2: Lancangjiang-Ailaoshan fold belt; 3: Ailaoshan uplift; 4: Simao rift valley; 5: Lancangjiang uplift; 6: Mojiang margin uplift; 7: Jiangcheng depression; 8: Wuliangshan uplift; 9: Jinggu depression; 10: Pu’er-Dehua uplift; 11: Dadugang depression; 12: Mengyuan uplift; 13: Jinghong margin uplift; 14: fault; 15: river; 16: spring; 17: international boundary.