Hydrothermal Systems Characterized by Crustal Thermally‐dominated Structures of Southeastern China

Abstract

Southeastern China (SE China) is located in the Pacific tectonic domain and has experienced a series of tectono–magmatic activities induced by the subduction of the Paleo–Pacific Plate since the late Mesozoic. The subduction formed a series of NE‐NNE oriented faults under the NW‐SE regional stress field, along which a number of thermal springs occur. Previous studies have focused on the genesis mechanism of specific geothermal field in SE China, but the generality characteristic of hydrothermal systems in SE China remains unclear. In this paper, we investigate the correlation between geothermal activity, hydrochemical type, and regional faults by studying the distribution of hydrothermal activity and geochemical properties of typical hydrothermal systems in SE China. The hydrothermal systems in SE China have the crustal thermal–dominated structures genesis unique to the specific geological and tectonic conditions of the Eurasian Plate margin. The upwelling of the asthenosphere and the widespread granitoids with high radiogenic heat production in SE China provide major heat sources for the regional geothermal anomalies. The NE–oriented crustal thermal–dominant faults are critical for the formation of geothermal anomalies. and NW–oriented extensional faults have created favorable conditions for meteoric water infiltration, transport and form thermal springs.

Metallogenic Age and Ore‐forming Material Sources of the Dahongshan Fe‐Cu Deposit, Yunnan Province: Insights from Molybdenite Re‐Os Dating and H‐O‐S‐Pb Isotopes

“…Studies have shown that the ore-forming fluid of the Dahongshan deposit was formed by mixing hightemperature with high-salinity and low-salinity fluids from mantle magma (Zhong et al, 1999;Wu et al, 2008). In addition, the protolith of the metavolcanic rocks exposed in the Dahongshan deposit is tholeiite and has the geochemical characteristics of the mid-ocean ridge environment, which is conducive for submarine hydrothermal circulation and metasomatism (Xu, 1998;Zhong et al, 1999;Ye et al, 2021;Gui et al, 2023). In contrast, the mixing of magmatic water with meteoric water reasonably explains the observed δ 18 O H2O values of gangue and ore minerals.…”

Characteristics, Formation Periods, and Controlling Factors of Tectonic Fractures in Carbonate Geothermal Reservoirs: A Case Study of the Jixianian System in the Xiong'an New Area, China

“…Geothermal researchers have carried out a series of studies on the thermophysical properties of rocks in the study area, including temperature field distribution, terrestrial heat flow, lithosphere thermal structure, and have gained a preliminary understanding of the basic characteristics of the present-day geothermal field (Jiang et al, 2016;Cui et al, 2019;Wang et al, 2019Wang et al, , 2023. Several studies have been completed on the characteristics…”