Geothermics最新文献

{"title":"Thermal-Hydrological-Geochemical modeling of the distribution of acidic fluids at the Onikobe geothermal field, Japan","authors":"Norifumi Todaka ,&nbsp;Nicolas Spycher ,&nbsp;Michael B. Kowalsky ,&nbsp;Stefan Finsterle ,&nbsp;Shohta Shimizu ,&nbsp;Takuya Sakai ,&nbsp;Shigetaka Nakanishi","doi":"10.1016/j.geothermics.2025.103308","DOIUrl":"10.1016/j.geothermics.2025.103308","url":null,"abstract":"<div><div>Geothermal development has not been a priority in acidic fluid areas to date. In recent years, Japan's deregulation has allowed wells to be drilled near young volcanoes in national parks where geothermal development investigations have not previously been conducted, and acidic fluids are now being developed in some areas. More areas with acidic fluids are expected to be discovered in the future. Our goal is to predict the chemical characteristics and distribution of acidic fluids prior to well drilling to maximize the use of available acidic fluids (pH 3∼5) so that the exploitable areas of geothermal resources can be expanded. Predicting acidic fluid production is important to plan and implement corrosion mitigation measures to minimize detrimental corrosive effects on wells and surface facilities. In this paper, the Onikobe geothermal field is used as a model field, and a conceptual model of this geothermal system with acidic fluids is developed. Natural-state coupled thermal-hydrological-geochemical (THC) simulations were performed to estimate the acidic fluid distribution zone and to evaluate the validity of the conceptual model. Multiple iterations between TH (thermal-hydrological, both natural-state and exploitation phases) and THC simulations were performed using iTOUGH2 and TOUGHREACT until reasonable pressures, temperatures, enthalpies, and chemical species concentrations could be obtained. The pH of the acidic fluid zone at the Onikobe field remains stable at about pH 3.5, with the acidic fluid understood to extend consistently with the spatial distribution of pyrophyllite.</div></div>","PeriodicalId":55095,"journal":{"name":"Geothermics","volume":"130 ","pages":"Article 103308"},"PeriodicalIF":3.5,"publicationDate":"2025-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143807514","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A geochemical and isotopic approach for geothermal exploration: Deciphering fluid-rock interaction in thermal fluids of San Miguel-Vallecitos fault system, Baja California, Mexico","authors":"Claudio Inguaggiato ,&nbsp;Marisol Juárez-Reyes ,&nbsp;Loïc Peiffer ,&nbsp;Daniel Carbajal-Martínez ,&nbsp;María G. Olguín-Martínez","doi":"10.1016/j.geothermics.2025.103324","DOIUrl":"10.1016/j.geothermics.2025.103324","url":null,"abstract":"<div><div>Thermal fluids are commonly found in Baja California, particularly along active fault systems, despite the lack of recent magmatic activity. This study focuses on the San Miguel-Vallecitos Fault System (SMVFS) in Baja California, Mexico, a region influenced by the now inactive subduction of the Farallon plate beneath the North American plate and the active rifting of Gulf of California. These events have shaped the fault systems and could contribute to the thermal fluids observed today. This study explores the geochemical and isotopic composition of thermal springs, including dissolved and bubbling gases to 1) estimate reservoir temperatures using classic solute and multicomponent geothermometers and 2) characterize the origin of helium and determine if the mantle helium proportion along SMVFS is related to rising mantle fluids, recent magmatic activity or residual ³He from crustal sources (magma aging).</div><div>The thermal springs are subdivided into 2 groups based on their geographical distribution and chemical and isotopic compositions. Group 1 waters, localized in the southern sector of the SMVFS with temperatures ranging from 28 °C to 35 °C and total dissolved solids (TDS) from 0.22 to 0.36 g L⁻¹, in contrast Group 2 waters in the northern sector have temperatures of 52 °C and 52.8 °C and TDS values of 0.63 and 0.69 g L⁻¹. The temperature estimated using solute geothermometers allows to identify a low-temperature geothermal system, with the highest temperature mostly estimated for Group 2 waters (up to 112 °C). Both groups show N₂-dominated gas composition, with higher concentrations of He and CH₄ compared to CO₂. Helium isotopes ratio (0.04–0.52Ra) and ⁴He/²⁰Ne ratios (8.4–206.2) allowed to identify that most of the helium is of radiogenic origin. However, the proportion of mantle-derived He increases from south to north along the SMVFS, reaching 6.3 % in Group 2, where the highest outlet temperatures were measured. The ³He/⁴He ratios of fluids along the SMVFS cannot be explained by a magma aging model, especially the higher ratios of Group 2, allowing us to decipher that either a more recent post batholitic magmatic event occurred in the studied area or fluids from the mantle are migrating along the permeable SMVFS, the second hypothesis being more likely considering the regional geological context.</div></div>","PeriodicalId":55095,"journal":{"name":"Geothermics","volume":"130 ","pages":"Article 103324"},"PeriodicalIF":3.5,"publicationDate":"2025-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143807513","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Influence of thermal and cooling cycles on the mechanical properties of building stones with carbonate texture","authors":"Aneseh Mosaddegh,&nbsp;Ahmad Fahimifar,&nbsp;Parsa Najafipour","doi":"10.1016/j.geothermics.2025.103330","DOIUrl":"10.1016/j.geothermics.2025.103330","url":null,"abstract":"<div><div>Rocks are frequently subjected to environmental stress, with one of the most prevalent being heating and cooling cycles. Rocks with calcareous origin, in particular, show significant responses to fluctuations in temperature. This study investigates the mechanical characteristics of two types of carbonate rocks, travertine and marble, under various temperature conditions (+300 °C, +100 °C, ambient temperature, -10 °C, and -30 °C). Key property assessed include uniaxial compressive strength, three-point bending strength, Brazilian tensile strength, and pressure wave velocity. These tests were conducted across different thermal cycles (one and three) to observe the effects of repeated temperature fluctuations. Advanced analytical techniques such as X-ray diffraction (XRD), X-ray fluorescence (XRF), scanning electron microscopy (SEM), and CT scans were employed. Additionally, image processing techniques were used to detect and quantify cracks, analyze crack areas, and measure strain in each particle of the samples. The results demonstrated that tensile and flexural strength decreased with rising temperatures and increased as temperatures fell. However, after exposure to +100 °C, the compressive strength of travertine nearly doubled, while in marble, it increased by 1.3 times. Following exposure to +300 °C and the repetition of heating-cooling cycles, the compressive strength declined compared to the +100 °C condition. Analysis using XRD, XRF, SEM, and CT-Scan revealed significant effects from the presence of calcite, moisture within the sample, and the formation of microcracks on the mechanical properties. Travertine, with its sedimentary and porous texture, exhibited a greater response to these changes than marble.</div></div>","PeriodicalId":55095,"journal":{"name":"Geothermics","volume":"130 ","pages":"Article 103330"},"PeriodicalIF":3.5,"publicationDate":"2025-04-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143800056","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Data-driven Play Fairway Analysis applied to Los Humeros geothermal field, Mexico","authors":"Emmanuel Olvera-García ,&nbsp;Jorge Alejandro Ávila-Olivera ,&nbsp;Ángel Figueroa-Soto ,&nbsp;Mark Coolbaugh ,&nbsp;Domenico Liotta","doi":"10.1016/j.geothermics.2025.103337","DOIUrl":"10.1016/j.geothermics.2025.103337","url":null,"abstract":"<div><div>A data-driven geothermal Play Fairway Analysis (PFA) of the Los Humeros geothermal field in Puebla, Mexico was conducted using published geoscientific data. The available datasets considered as positive indicators or proxies (evidence layers) for the necessary elements in the formation of hydrothermal geothermal systems (e.g., permeability, heat) were weighted and integrated. The datasets used as proxies were faults, favorable structural settings, CO₂ efflux, earthquakes, surficial hydrothermal manifestations and soil temperatures. The proxies were combined using weights-of-evidence statistics to obtain models for permeability and heat. Afterwards, the permeability and heat models were integrated through a product operation to build an overall geothermal favorability model. The geothermal favorability model highlights four areas with elevated geothermal favorability located to the NNE, NNW, NE, and south of the village of Los Humeros. The areas of higher favorability represent zones where geothermal fluids are more likely to exist underground. These four areas could represent targets for further exploration (e.g., exploration wells), particularly area D near the village of Los Humeros. Area D is the largest, it is underexploited (compared with areas A, B and C) and presents the strongest CO₂ and soil temperatures anomalies. Finally, it is proposed that favorable structural settings exercise a primary control on the location of permeable zones with geothermal fluids.</div></div>","PeriodicalId":55095,"journal":{"name":"Geothermics","volume":"130 ","pages":"Article 103337"},"PeriodicalIF":3.5,"publicationDate":"2025-04-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143800055","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Improving photovoltaic Panels by utilizing ground-coupled heat exchangers: Insights and technological advances","authors":"Ahmed Ameen Ali ,&nbsp;Dheiaa Alfarge ,&nbsp;Farhan lafta Rashid ,&nbsp;Adnan A. Ugla ,&nbsp;A.K. Kareem ,&nbsp;Hayder I. Mohammed","doi":"10.1016/j.geothermics.2025.103335","DOIUrl":"10.1016/j.geothermics.2025.103335","url":null,"abstract":"<div><div>The continuous rise in energy demand and growing environmental concerns necessitate innovative approaches to optimizing renewable energy technologies. Among these, photovoltaic (PV) panels play a pivotal role but suffer efficiency losses due to surface overheating. Ground-coupled heat exchangers (GHEs) have emerged as a promising solution, leveraging geothermal energy to regulate PV panel temperatures.</div><div>This review explores the application of GHEs for PV cooling, focusing on technical advancements, operational parameters, and soil-related influences. Key aspects analyzed include GHE design, working fluid characteristics, mass flow rates, and pipe material properties, all of which critically impact cooling efficiency and energy output. Recent studies indicate that GHE systems can reduce surface temperatures by 20 °C–25 °C and enhance thermal and electrical efficiency by 20 %, respectively. Design innovations, such as vertical and spiral configurations and nanofluid-enhanced working fluids, demonstrate significant performance improvements.</div><div>However, several challenges persist, including installation complexities, maintenance difficulties, and soil-dependent variability. This review also examines the economic and environmental feasibility of GHEs, emphasizing their integration with renewable energy systems for sustainable development. Future research directions include optimizing GHE designs, employing artificial intelligence for performance prediction, and exploring cost-effective materials and configurations.</div><div>By addressing current limitations, GHEs can significantly enhance PV efficiency, reduce carbon footprints, and promote the broader adoption of renewable energy technologies. This comprehensive review aims to guide researchers and practitioners toward the innovative deployment of GHEs in solar energy applications.</div></div>","PeriodicalId":55095,"journal":{"name":"Geothermics","volume":"130 ","pages":"Article 103335"},"PeriodicalIF":3.5,"publicationDate":"2025-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143759609","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Study on the ground temperature response induced by GSHP system operation under different geological conditions","authors":"Shiyu Zhou ,&nbsp;Hanbing Jia ,&nbsp;Bo Zhou ,&nbsp;Jiying Liu ,&nbsp;Ping Cui ,&nbsp;Mingzhi Yu","doi":"10.1016/j.geothermics.2025.103333","DOIUrl":"10.1016/j.geothermics.2025.103333","url":null,"abstract":"<div><div>Ground temperature is a crucial factor influencing the performance of the ground source heat pump (GSHP) system. Different from the periodic variation of the initial shallow-layer ground temperature, the deep-layer ground temperature variation becomes much more complex after the system starts operating. At this stage, not only the ground surface heat exchange conditions and the geothermal gradient are influencing factors, but also the heat exchange process of the buried pipe and geological conditions will affect the ground temperature variation. In this study, ground temperature data of two systems located in different geological conditions are taken as examples. Based on the monitored data, the relationship between the ground temperature variation and depth is analyzed, as well as the impact from geological distributions. It has been found that the variation amplitude of the ground temperature varies along the depth direction. However, it is hard to find clear laws of the ground temperature variations from the measured data. Therefore, CFD (Computational Fluid Dynamics) simulation work is conducted to verify some guesses from the monitoring data analysis. It has been found that, except for the pipe bottom, the difference in ground temperature response mainly results from the change in ground thermal properties, not the heat transfer depth position of the buried pipes. This finding is beneficial to understanding the ground temperature variation mechanism in the GSHP system operation.</div></div>","PeriodicalId":55095,"journal":{"name":"Geothermics","volume":"130 ","pages":"Article 103333"},"PeriodicalIF":3.5,"publicationDate":"2025-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143739775","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Identifying aquifer thermal energy storage (ATES) key locations for hospitals in Lower Saxony, Germany","authors":"Maximilian Noethen ,&nbsp;Ruben Stemmle ,&nbsp;Nick Siebert ,&nbsp;Matthias Herrmann ,&nbsp;Kathrin Menberg ,&nbsp;Philipp Blum ,&nbsp;Peter Bayer","doi":"10.1016/j.geothermics.2025.103334","DOIUrl":"10.1016/j.geothermics.2025.103334","url":null,"abstract":"<div><div>In a decade of advancing energy transition, European countries, including Germany, face the challenge of managing seasonal imbalances in heating and cooling demands. Aquifer thermal energy storage (ATES), which uses groundwater as a storage medium in an open-loop geothermal system, offers a promising solution. Infrastructure requiring both heating and cooling, such as universities, data centers, shopping malls, office buildings, and hospitals, are particularly suited for ATES. Especially hospitals have high heating and cooling demands, making them promising candidates. This study evaluates the ATES suitability in the state of Lower Saxony, Germany, where geological conditions in many areas resemble those in the bordering Netherlands, the worldwide leader in the application of ATES. Hence, the study focuses on identifying ATES key locations in Lower Saxony by estimating the cooling capacities of 113 hospitals using visible compression chiller fans. Cooling capacities of up to 5.9 MW are detected, with a mean of 0.9 ± 1.2 MW. The results show that 57 % of the area with shallow porous aquifers in Lower Saxony is well or very well suited for ATES, with 60 hospitals located in these areas. ATES offers payback times of 2–10 years and CO₂ savings of up to 74 % compared to conventional systems, highlighting its economic and environmental advantages. However, no system is currently operating in Lower Saxony and the lack of specific regulation for ATES hinders their development. Establishing supportive and novel policy frameworks could unlock the potential of this sustainable thermal energy storage technology.</div></div>","PeriodicalId":55095,"journal":{"name":"Geothermics","volume":"130 ","pages":"Article 103334"},"PeriodicalIF":3.5,"publicationDate":"2025-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143747700","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Heat flow, lithospheric thermal structure, and its tectonic implication of the Southern North China Basin, East-central China","authors":"Yibo Wang ,&nbsp;Yaqi Wang ,&nbsp;Zhennan Zhong ,&nbsp;Chaoqiang Chen ,&nbsp;Lanyong Guo ,&nbsp;Huihui Zhang ,&nbsp;Lijuan He ,&nbsp;Shengbiao Hu","doi":"10.1016/j.geothermics.2025.103336","DOIUrl":"10.1016/j.geothermics.2025.103336","url":null,"abstract":"<div><div>Heat flow is a fundamental parameter in geothermal research. It not only complements seismic data by providing significant constraints on lithospheric thickness, geophysical properties, and tectonic evolution, but it is also vital for the evaluation and selection of geothermal resource sites. In this study, we conducted systematic measurements of steady-state temperature, thermal conductivity, and heat production from ten boreholes in the Southern North China Basin (SNCB), East-central China. These measurements yielded ten high-quality heat flow values. Combining these new data with previous research, we developed 2D temperature models and calculated lithospheric thickness. Our results reveal that heat flow in the SNCB follows a \"lower in the north, higher in the south\" pattern, with an average geothermal gradient of 25±5 °C/km and an average heat flow value of 57±12 mW/m². The lithospheric thickness varies significantly across the region, being approximately 105 km in the northwestern margin of the basin, increasing to 140–150 km in the eastern Huaibei Uplift, and decreasing to around 83 km in the neighboring Lower Yangtze Craton. This study not only provides geodynamic insights into variations in the thermal state of cratonic regions but also offers critical data to enhance our understanding of lithospheric structure, tectono-thermal evolution, and geothermal resource potential in the SNCB and adjacent areas.</div></div>","PeriodicalId":55095,"journal":{"name":"Geothermics","volume":"130 ","pages":"Article 103336"},"PeriodicalIF":3.5,"publicationDate":"2025-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143739776","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Hydrogeochemical characteristics of geothermal springs along the central section of Altyn Tagh fault: Implications for deep fluid circulation and tectonic activity","authors":"Zhaotong Sun ,&nbsp;Jing Liu-Zeng ,&nbsp;Yanxiu Shao ,&nbsp;Wenxin Wang ,&nbsp;Xiaocheng Zhou ,&nbsp;Maoliang Zhang ,&nbsp;Ying Li ,&nbsp;Longfei Han ,&nbsp;Fengzhen Cui","doi":"10.1016/j.geothermics.2025.103327","DOIUrl":"10.1016/j.geothermics.2025.103327","url":null,"abstract":"<div><div>Geothermal springs associated with fault systems may offer valuable insights into fluid-rock interactions and crustal processes. However, hydrogeochemical data on the Altyn Tagh fault, a major strike-slip fault bounding the northern Tibetan Plateau, are scarce. In this study, the chemical and isotopic compositions of 29 geothermal springs along the central section of Altyn Tagh fault have been analyzed and the results show the following: (1) The springs are primarily meteoric in recharge source, exhibiting Na-SO₄-Cl and Ca-Mg-SO₄-Cl type. Calculated circulation depths ranging from approximately c. 135 m to c. 2790 m, indicating a shallow to intermediate hydrothermal system with limited water-rock interaction. Dissolved inorganic carbon (DIC) derives primarily from deep decarbonation and carbonate dissolution. (2) Specifically, the highest reservoir temperatures, deepest circulation, and greatest deeply sourced CO₂ flux have been found from the Xorkoli to the Wuzunxiaoer section of the fault. Spatial trends reveal increasing reservoir temperatures, circulation depths, and endogenic DIC fractions with increasing distance from the fault, suggesting the influence of distal, deeper geothermal systems on spring geochemistry. (3) Comparative analysis with other strike-slip faults reveals notably shallower circulation depths along the Altyn Tagh fault, attributable to the combined effects of cold crustal thermal regime, seismic cycle, and moderate topographic relief. Locally enhanced circulation depths occur in distinct sedimentary-hydrogeological conditions and extensional step-overs areas. These findings provide new constraints on the relationship between hydrothermal circulation and fault zone processes, with implications for understanding crustal fluid dynamics along major strike-slip faults.</div></div>","PeriodicalId":55095,"journal":{"name":"Geothermics","volume":"130 ","pages":"Article 103327"},"PeriodicalIF":3.5,"publicationDate":"2025-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143725944","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Numerical simulation and thermal control factor analysis of deep high-temperature geothermal energy in the Zhenghe-Dapu fault zone and its adjacent areas, Southeast China","authors":"Weiwei Ma ,&nbsp;Bo Zhang ,&nbsp;Hui Wu ,&nbsp;Chujie Cheng ,&nbsp;Runchao Liu ,&nbsp;Jinjiang Zhang","doi":"10.1016/j.geothermics.2025.103331","DOIUrl":"10.1016/j.geothermics.2025.103331","url":null,"abstract":"<div><div>The coastal area of Southeast China, characterized by high heat flow and extensive magmatic activity, has long been a focus of geothermal research. However, the formation mechanisms and geological controls governing deep high-temperature geothermal resources in this region remain poorly constrained, posing challenges for accurate resource assessment. Here, we built a two-dimensional lithospheric geological model integrating geological, seismic, and magnetotelluric data to quantify key thermal controls. Simulations reveal significant high-temperature anomalies in the Wuyishan and Coastal terranes, with temperatures exceeding 180°C at 5 km depth and surface heat flow surpassing 80 mW/m². These anomalies result from asthenospheric upwelling, facilitated by a thinned lithosphere, which delivers 73–92 mW/m² of mantle-derived heat flow. Additionally, Late Mesozoic-Cenozoic magmatic intrusion elevate shallow crustal temperatures by 31–43 °C, while the Zhenghe-Dapu shear zone with anisotropic high thermal conductivity along mylonitic foliation, acts as a deep heat conduit, forming localized 205 °C anomalies. Overlying low-thermal-conductivity sedimentary cover further insulates the system, sustains elevated temperatures, and modulates surface heat flow variations by ∼30 %. This study provides new constraints on deep high-temperature geothermal formation and offers key indicators for identifying favorable geothermal targets and optimizing resource assessment.</div></div>","PeriodicalId":55095,"journal":{"name":"Geothermics","volume":"130 ","pages":"Article 103331"},"PeriodicalIF":3.5,"publicationDate":"2025-03-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143705855","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}