Fig. 1From: Geochemical and H–O–Sr–B isotope signatures of Yangyi geothermal fields: implications for the evolution of thermal fluids in fracture-controlled type geothermal system, Tibet, Chinaa Geological sketch of main geothermal belts in Tibet (modified from Wang et al. 2020); b simplified geological map of YHGF (modified from The Geothermal Geological Team of Tibet 1990); c geological cross sections between A and A′Back to article page