Hydrochemical Characteristics and Formation of the Madeng Hot Spring in Yunnan, China

Figure 1

Geological sketch map near the Madeng hot spring in Jianchuan of Yunnan Q—Quaternary gravel and sand; E—Eogene purple mudstone, siltstone, sandstone, and conglomerate; K—Cretaceous fine-grained sandstone, amaranth mudstone, and feldspar quartz sandstone; J—Jurassic red mudstone, siltstone; T—Triassic limestone, siltstone; P—Permian basalt and tuff breccia; C—Carboniferous quartz sandstone, limestone; D—Devonian dolomitic limestone and dolomite; O—Ordovician quartz sandstone; Pt₂—Mesoproterozoic mica schist, dark cloud flash schist; F1—Lancangjiang river fault; F2—Weixi-Qiaohou fault; F3—Jinshajiang-Ailaoshan fault; F4—Lanping-Simao middle fault (Bijiang fault); F5—Duosong-Ludian fault; F6—Zhongdian-Jianchuan fault; F7—Annan-Jianchuan fault; F8—Jianchuan-Lijiang fault; F9—Heqing-Eryuan fault; F10—Honghe fault; 1—stratigraphic boundary; 2—strike-slip faults; 3—reverse fault; 4—rivers; 5—spring; 6—city; 7—county; 8—village and town; 9—mountain.