scholarly journals Hydrogeochemical Characteristics and Formation of Low-Temperature Geothermal Waters in Mangbang-Longling Area of Western Yunnan, China

2021 ◽  
Vol 2021 ◽  
pp. 1-13
Author(s):  
Xing-Wang Chang ◽  
Mo Xu ◽  
Liang-Wen Jiang ◽  
Xiao Li ◽  
Yun-Hui Zhang
Keyword(s):  
Low Temperature ◽  
Hot Spring ◽  
Thermal Waters ◽  
Geological Condition ◽  
Geothermal Waters ◽  
Fracture Intersection ◽  
Western Yunnan ◽  
Data Points ◽  
Cold Spring ◽  
Silica Geothermometry

Numerous low-temperature geothermal waters are distributed extensively in Mangbang-Longling of western Yunnan in China, whose formation mechanism has not been completely investigated yet. This study focused on the hydrogeochemical evolution, reservoir temperature, and recharge origin of geothermal waters using hydrogeochemical and deuterium-oxygen (D-O) isotopic studies. The low-temperature geothermal waters were characterized by HCO3-Na type, while shallow cold spring was of the hydrochemical type of HCO3-Ca. The hydrogeochemical characteristics of low-temperature geothermal waters were mainly determined by the dissolution of silicate minerals based on the geological condition and correlations of major and minor ions. The reservoir temperatures of low-temperature geothermal waters ranged from 111°C to 126°C estimated by silica geothermometry and the silicon-enthalpy graphic method. Low-temperature geothermal waters circulated at the largest depth of 1794–2077 m where deep high-temperature geothermal waters were involved. The data points of δD and δ18O of the hot spring water samples in the study area show a linear right-up trend, indicating the δ18O reaction between the water and rock and a possible mixture of magmatic water from below. The low-temperature thermal waters were recharged by meteoric water at the elevation of 2362–3653 m calculated by δD values. Upwelling by heating energy, low-temperature geothermal waters were exposed as geothermal springs in the fault and fracture intersection and mixed by up to 72% shallow cold waters at surface. Based on acquired data, a conceptual model of the low-temperature geothermal waters in the Mangbang-Longling area was proposed for future exploitation.

scholarly journals Origin of the low-medium temperature hot springs around Nanjing, China

2021 ◽  
Vol 13 (1) ◽  
pp. 820-834
Author(s):  
Jun Ma ◽  
Zhifang Zhou
Keyword(s):  
Hot Springs ◽  
Hot Spring ◽  
Hot Water ◽  
Geothermal Water ◽  
Geological Condition ◽  
Medium Temperature ◽  
Rock Interaction ◽  
Karst Landform ◽  
Karst Landforms ◽  
Development And Management

Abstract The exploration of the origin of hot spring is the basis of its development and utilization. There are many low-medium temperature hot springs in Nanjing and its surrounding karst landform areas, such as the Tangshan, Tangquan, Lunshan, and Xiangquan hot springs. This article discusses the origin characters of the Lunshan hot spring with geological condition analysis, hydrogeochemical data, and isotope data. The results show that the hot water is SO4–Ca type in Lunshan area, and the cation content of SO4 is high, which are related to the deep hydrogeological conditions of the circulation in the limestone. Carbonate and anhydrite dissolutions occur in the groundwater circulation process, and they also dominate the water–rock interaction processes in the geothermal reservoir of Lunshan. The hot water rising channels are deeply affected by the NW and SN faults. Schematic diagrams of the conceptual model of the geothermal water circulation in Lunshan are plotted. The origin of Tangshan, Tangquan, and Xiangquan hot springs are similar to the Lunshan hot spring. In general, the geothermal water in karst landforms around Nanjing mainly runs through the carbonate rock area and is exposed near the core of the anticlinal structure of karst strata, forming SO4–Ca/SO4–Ca–Mg type hot spring with the water temperature less than 60°C. The characters of the hot springs around Nanjing are similar, which are helpful for the further research, development, and management of the geothermal water resources in this region.

scholarly journals Study on the Geological Condition Analysis and Grade Division of High Altitude and Cold Stope Slope

2021 ◽  
Vol 13 (22) ◽  
pp. 12464
Author(s):  
Ruichong Zhang ◽  
Shiwei Wu ◽  
Chenyu Xie ◽  
Qingfa Chen
Keyword(s):  
Low Temperature ◽  
High Altitude ◽  
Stable State ◽  
Geological Condition ◽  
Rock Layer ◽  
Eastern Slope ◽  
Geological Conditions ◽  
Grade Ii ◽  
Grade Division ◽  
Grade Iii

Analysis of the geological conditions of high-altitude and low-temperature stope slopes and the study of grade division are the basis for the evaluation of slope stability. Based on the engineering background of the eastern slope of the Preparatory iron mine in Hejing County, Xinjiang, we comprehensively analyse and summarize the factors that affect the geological conditions of high-altitude and cold slopes and finally determine nine geological conditions that affect the index parameters. Based on a back-propagation (BP) neural network algorithm, we establish an applicable network model to analyse the geological conditions of slopes in cold areas. The model is applied to the eastern slope to analyse and classify the geological conditions of the high-altitude and low-temperature slopes. The research results show that the skarn rock layer in the eastern slope is in a stable state and not prone to landslides, and its corresponding geological condition is Grade I; meanwhile, the monzonite porphyry rock layer is in a relatively stable state, with a potential for landslides and a corresponding geological condition Grade II. The marble rock layer is in a generally stable state, there is the possibility of landslide accidents, and the corresponding geological condition level is Grade III. The limestone rock layer is in an unstable state and prone to landslide accidents, it has a corresponding geology condition Grade IV. Therefore, the eastern slope can be divided into different geological condition regions: Zone I, Zone II, Zone III, and Zone IV, and the corresponding geological condition levels for these are Grade I, Grade II, Grade III, and Grade IV. These results may provide a basis for the stability evaluation of high altitudes and cold slopes.

scholarly journals Comparative studies of the deformation techniques for the singular-drift problem in the complex Langevin method

2018 ◽  
Vol 175 ◽  
pp. 07019 ◽  
Author(s):  
Yuta Ito ◽  
Jun Nishimura
Keyword(s):  
Low Temperature ◽  
Dirac Operator ◽  
Matrix Model ◽  
Comparative Studies ◽  
Deformation Parameter ◽  
High Density ◽  
Large N ◽  
Singular Drift ◽  
Different Types ◽  
Data Points

In application of the complex Langevin method to QCD at high density and low temperature, the singular-drift problem occurs due to the appearance of near-zero eigenvalues of the Dirac operator. In order to avoid this problem, we proposed to de-form the Dirac operator in such a way that the near-zero eigenvalues do not appear and to extrapolate the deformation parameter to zero from the available data points. Here we test three different types of deformation in a simple large-N matrix model, which under-goes an SSB due to the phase of the fermion determinant, and compare them to see the consistency with one another.

Geochemical features of the geothermal and mineral waters from Apuseni Mountains, Romania

2020 ◽  
Author(s):  
Alin-Marius Nicula ◽  
Artur Ionescu ◽  
Cristian-Ioan Pop ◽  
Carmen Roba ◽  
Walter D’Alessandro ◽  
...  
Keyword(s):  
Heavy Metal ◽  
Pannonian Basin ◽  
Water Sources ◽  
Mineral Waters ◽  
Thermal Waters ◽  
Geothermal Waters ◽  
Study Region ◽  
Apuseni Mountains ◽  
The North ◽  
North Western

<p><strong>Geochemical features of the geothermal and mineral waters from Apuseni Mountains, Romania</strong></p><p>Alin-Marius Nicula<sup>1</sup>, Artur Ionescu<sup>1,2</sup>, Cristian-Ioan Pop<sup>1</sup>, Carmen Roba<sup>1</sup>, Walter D’Alessandro<sup>3</sup>, Ferenc Lazar Forray<sup>4</sup>, Iancu Oraseanu<sup>5</sup>, Calin Baciu<sup>1</sup></p><p><sup> </sup></p><p><sup>1</sup>Babes-Bolyai University, Faculty of Environmental Science and Engineering, Str. Fantanele nr. 30, 400294, Cluj-Napoca, Romania ([email protected])</p><p><sup>2</sup>University of Perugia, Department of Physics and Geology, Via A. Pascoli 06123, Perugia, Italy</p><p><sup>3</sup>Istituto Nazionale di Geofisica e Vulcanologia, Sezione di Palermo, Via Ugo la Malfa, 153,</p><p>90146 Palermo, Italy</p><p><sup>4</sup>Department of Geology, Babes-Bolyai University, Kogalniceanu 1, 400084 Cluj-Napoca, Romania</p><p><sup>5</sup>Romanian Association of Hydrogeologists, Bucuresti, Romania</p><p> </p><p>The Apuseni Mountains are located in the western part of Romania and separate the Pannonian Basin from the Transylvanian Basin. These mountains are famous and intensely studied for their important non-ferrous metal resources. Few data were published about the geothermal potential of this area. More works have been dedicated to mineral waters, while the geothermal waters are only briefly described, without sufficient emphasis on them. The current research is focusing on the two categories, cold mineral and geothermal water in the Apuseni Mountains, compared to the surrounding areas, in order to better understand their genesis and the general context of the geothermalism in the study region. A preliminary survey of these waters was done in 2019 taking water and gas samples from 41 sources.</p><p>The pH varies between 6.00 and 9.02 and, the lowest values have been measured in the CO<sub>2</sub>-rich waters of the Southern Apuseni Mountains. Water temperatures vary between 11.1 <sup>â—‹</sup>C and 81 <sup>â—‹</sup>C. In the southern part of the Apuseni Mountains, the geothermal waters are of the calcium bicarbonate type (Ca-HCO<sub>3</sub>), while in the north-western part, the sodium bicarbonate type (Na-HCO<sub>3</sub>) is more common. The water sources from the north-western part are close to the Pannonian Basin and show features comparable to the thermal waters of this basin. Conductivity values show significant variations between 142 and 2040 µS/cm, but regional homogeneities were observed. The highest concentration of bicarbonate was measured in one of the localities of the northern study area (BeiuÅŸ Depression - 3318.4 mg/L). The dissolved heavy metal concentrations (Zn, Pb, Cd, Cr, Ni, Cu, Fe) in the water samples were also measured. For all the investigated waters, the heavy metal content was low. The highest concentrations were recorded for Fe 342.90 µg/L and Zn 86.14 µg/L. The isotopic data (δ<sup>18</sup>O and δ<sup>2</sup>H) demonstrate the meteoric origin of the thermal waters.</p><p>Some springs and wells release free gases. The gas chromatographic analyses show the prevalence of N<sub>2</sub> and CO<sub>2</sub>, with minor amounts of CH<sub>4 </sub>in the water sources close to the Pannonian Basin. The isotope composition of Helium shows values between 0.9 and 2.18 R/Ra indicating a prevailing crustal source with a significant mantle component. In the case of δ<sup>13</sup>C-CO<sub>2</sub> the values range between -12.7 and -6.1 ‰ vs.V-PDB, indicating that the CO<sub>2</sub> originates possibly from a limestone source.</p>

Investigation of Therapeutic Effects of Thermal Waters of Afyonkarahisar Region in Stress-Induced Mice

2020 ◽  
Author(s):  
Bülent Elitok
Keyword(s):  
Hot Spring ◽  
Tap Water ◽  
Day Treatment ◽  
Study Groups ◽  
Spring Water ◽  
Thermal Waters ◽  
Control Group ◽  
Therapeutic Effects ◽  
Glucose Levels ◽  
Blood Biochemical

In this study, 20 Albino mice of the same daily age were used. All the animals were restrained in well-ventilated 50 ml tubes (plus 3 or 4 cm long middle tubes), which were slipped over the tail to restrict movement even more and left undisturbed under an opaque duration of the stress (30 min). After stress procedure was applied in all animals, 20 mice which have same alive weight average and constitute the study material were divided into two groups as control group (CG) (n=10) and study groups (SG) (n=10) for a 21-day treatment period equally and randomly. Normal tap water was added to the CG mice’ drinkers, while the hot spring water that was brought from the source each day as fresh added to SG mice’ drinkers and they were allowed to reach ad libitum. Clinical, hematological and blood biochemical parameters were measures on 1, 7, 14 and 21 days after treatment in all the animals. The results of this study showed that cortisol and glucose levels decreased in stressed mice treated with Süreyya I Hot Spring Water, while ALB, TP, T3 and T4 levels increased and these changes were statistically significant plessthan0.06) when compared to the control group.

Acid-sulphate hydrothermal alteration of andesitic tuffs and genesis of halloysite and alunite deposits in the Biga Peninsula, Turkey

Clay Minerals ◽  
2008 ◽  
Vol 43 (2) ◽  
pp. 281-315 ◽  
Author(s):  
Ö. I. Ece ◽  
P. A. Schroeder ◽  
M. J. Smilley ◽  
J. M. Wampler
Keyword(s):  
Hydrothermal Alteration ◽  
Volcanic Rocks ◽  
Geothermal Field ◽  
Parent Material ◽  
Thermal Waters ◽  
Geothermal Waters ◽  
Biga Peninsula ◽  
The North ◽  
Clay Deposits ◽  
Nw Turkey

AbstractThe Biga Peninsula of NW Turkey is host to six major halloysite deposits in the Go¨nen, Yenice and Balya districts. Mineralization took place in areas of Permian limestone blocks where the Triassic Karakaya Complex is in contact with early Miocene calc-alkaline volcanic rocks. Hypogene halloysite mineralization was controlled by the intersection of minor faults in the vicinity of clay deposits. During the Pleistocene, activity of the North Anatolian Fault (NAF) brought ascending geothermal solutions through the fault zones to the surface, which led to hydrothermal alteration and halloysite formation. N-MORB normalized element values for each halloysite deposit and the volcanic rocks suggest genetic links. Alunite and halloysite were formed in the Turplu area where upwelling hydrothermal waters contained major H2S and SO2acids. Only halloysite mineralization occurred in outflow areas of the same fossil geothermal field.Pyrite and alunite samples from the Turplu deposits have δ34S values of 0.6–1.8% and 4.8–7.9%, respectively, with values for gypsum of 3.1–3.5%. The δ34S values of pyrite suggest that local meteoric waters had partially mixed with the dominant fluid during the closure stage of fossil hydrothermal activities. The range of δD values of halloysite samples from Turplu is –58.4 to –68.6%. The δ18O values for halloysite are in the range 16.7–18.1%. All halloysite deposits in the study areas are either overlying or adjacent to limestone blocks, and these provide excellent drainage for the discharging geothermal waters. Subsurface drainage systems in the karstic environment and the SO2-bearing thermal waters indicate the importance of acidic waters and the continuous leaching of elements in forming relatively pure hydrated halloysite. A steam-heated dissolution-precipitation model is proposed for the occurrence of all halloysite and alunite deposits. Sulphur gases (H2S-SO2) of hypogene origin rose from deep in the fault zone to the surface where they encountered oxygenated groundwater at the water table. The occurrence of H2SO4in this hydrothermal system enhanced the acidity of geothermal waters provoking advanced argillic alteration. Hypogene alunite deposits also have large P2O5contents, suggesting a parent material with a magmatic origin deeper than the alkaline tuffs. Halloysite is a fast-forming metastable precursor to kaolinite.

scholarly journals Interaction of thermal waters with carbonate and aluminosilicate minerals: a case study of Bang mineral hot spring, Central Vietnam

2019 ◽  
Vol 98 ◽  
pp. 01039
Author(s):  
Dmitry A. Novikov ◽  
Phan Thi Kim Van ◽  
Doan Van Tuyen ◽  
Do Thi Thu ◽  
Fedor F. Dultsev ◽  
...  
Keyword(s):  
Hydrothermal Vents ◽  
Hot Spring ◽  
Isotope Composition ◽  
Water System ◽  
Thermal Waters ◽  
Composition Analysis ◽  
Outlet Temperature ◽  
Central Vietnam ◽  
Group Water ◽  
First Time

Results of the studies of water-rock interactions for the Bang thermal water system (Bang Mineral Hot Spring) in Kuang Binh province, Central Vietnam, are presented for the first time. It was established that the thermal waters (62.1-97.1 °C) with total mineralization of 255-659 mg/dm3 of HCO3-Na composition are supersaturated with respect to carbonate minerals (calcite, magnesite, and dolomite) and saturated with respect to albite, microcline, laumontite, and glaucophane. The waters with the outlet temperature of 24.3-34.5 °C, with mineralization 44-87 mg/dm3 and composition HCO3-Cl-Na-Mg are unsaturated with respect to carbonates and are in the fields of stability of clay minerals: kaolinite, illite, Na-, Ca-, and Mg-montmorillonite. Theseresults are in good agreement with the results of the isotope composition analysis of the hydrothermal vents (δD, δ18O and 3H), according to which the time of water circulation for the first-group is higher than 60 years and may reach more than 1000 years, while for the second-group water it does not exceed 50 years.

scholarly journals Origin and Circulation of Springs in the Nangqen and Qamdo Basins, Southwestern China, Based on Hydrochemistry and Environmental Isotopes

Geofluids ◽  
2022 ◽  
Vol 2022 ◽  
pp. 1-25
Author(s):  
Xiwei Qin ◽  
Haizhou Ma ◽  
Xiying Zhang ◽  
Xiasong Hu ◽  
Guorong Li ◽  
...  
Keyword(s):  
Meteoric Water ◽  
Hot Springs ◽  
Environmental Isotopes ◽  
Hydrothermal Systems ◽  
Geochemical Type ◽  
Spatiotemporal Evolution ◽  
Geothermal Waters ◽  
Saline Springs ◽  
Silica Geothermometry ◽  
Isotope Analyses

The Nangqen and Qamdo (NQ-QD) basins in China have very rich geothermal and brine resources. The origin and spatiotemporal evolutionary processes of its hot and saline springs however remain unclear. Geochemical and isotopic (18O, 2H, 3H) studies have therefore been conducted on the water from the geothermal and saline springs in the NQ-QD Basin. All saline springs in the study area are of the Na-Cl geochemical type while geothermal waters show different geochemical types. The oxygen and hydrogen isotopic compositions of the springs in the NQ-QD Basin are primarily controlled by meteoric water or ice-snow melt water and are influenced by rock-water interactions. It is found that the saline springs in the study area are derived from the dissolution of halite and sulfate that occur in the tertiary Gongjue red bed, while the hot springs in the QD Basin are greatly influenced by the dissolution of carbonatites and sulfates from the Bolila (T3b) and Huakaizuo (J2h) formations. Results from silica geothermometry and a silicon-enthalpy hybrid model indicate that the apparent reservoir temperatures and reservoir temperatures for the hot springs in the QD Basin range from 57–130°C to75–214°C, respectively. Deuterium analysis indicates that most of the hot springs are recently recharged rain water. Furthermore, the saline springs have a weaker groundwater regeneration capacity than the hot springs. Tritium data shows that the ranges of calculated residence times for springs in this study are 25 to 55 years, and that there is a likelihood that hot springs in the QD Basin originated from two different hydrothermal systems. The geochemical characteristics of the NQ-QD springs are similar to those of the Lanping-Simao Basin, indicating similar solute sources. Thus, the use of water isotope analyses coupled with hydrogeochemistry proves to be an effective tool to determine the origin and spatiotemporal evolution of the NQ-QD spring waters.

scholarly journals Assessment of Chaves Low-Temperature CO2-Rich Geothermal System (N-Portugal) Using an Interdisciplinary Geosciences Approach

Geofluids ◽  
2019 ◽  
Vol 2019 ◽  
pp. 1-24 ◽  
Author(s):  
J. M. Marques ◽  
P. M. Carreira ◽  
L. A. Aires-Barros ◽  
F. A. Monteiro Santos ◽  
M. Antunes da Silva ◽  
...  
Keyword(s):  
Low Temperature ◽  
Geophysical Methods ◽  
Interdisciplinary Approach ◽  
Mineral Waters ◽  
Added Value ◽  
Granitic Rocks ◽  
Geothermal System ◽  
Geothermal Waters ◽  
Study Region ◽  
Rock Formations

This paper reviews the results of a multi- and interdisciplinary approach, including geological, geomorphological, tectonic, geochemical, isotopic, and geophysical studies, on the assessment of a Chaves low-temperature (77°C) CO2-rich geothermal system, occurring in the northern part of the Portuguese mainland. This low-temperature geothermal system is ascribed to an important NNE-trending fault, and the geomorphology is dominated by the “Chaves Depression,” a graben whose axis is oriented NNE-SSW. The study region is situated in the tectonic unit of the Middle Galicia/Trás-os-Montes subzone of the Central Iberian Zone of the Hesperic Massif comprising mainly Variscan granites and Paleozoic metasediments. Chaves low-temperature CO2-rich geothermal waters belong to the Na-HCO3-CO2-rich-type waters, with pH≈7. Total dissolved solids range between 1600 and 1850 mg/L. Free CO2 is of about 500 mg/L. The results of SiO2 and K2/Mg geothermometers give estimations of reservoir temperature around 120°C. δ18O and δ2H values of Chaves low-temperature CO2-rich geothermal waters indicate a meteoric origin for these waters. No significant 18O-shift was observed, consistent with the results from the chemical geothermometry. δ13CCO2 values vary between −7.2 and −5.1‰ vs. V-PDB, and CO2/3He ratios range from 1×108 to 1×109, indicating a deep (upper mantle) source for the CO2. 3He/4He ratios are of about 0.9 (R/Ra). The Chaves low-temperature CO2-rich geothermal waters present similar 87Sr/86Sr ratios (between 0.728035 and 0.716713) to those of the plagioclases from granitic rocks (between 0.72087 and 0.71261) suggesting that water mineralization is strongly ascribed to Na-plagioclase hydrolysis. Geophysical methods (e.g., resistivity and AMT soundings) detected conductive zones concentrated in the central part of the Chaves graben as a result of temperature combined with the salinity of the Chaves low-temperature CO2-rich geothermal waters in fractured and permeable rock formations. This paper demonstrates the added value of an integrated and multi- and interdisciplinary approach for a given geothermal site characterization, which could be useful for other case studies linking the assessment of low-temperature CO2-rich geothermal waters and cold CO2-rich mineral waters emerging in a same region.

scholarly journals Low-enthalpy thermal waters within Khoja-Obi-Garm field (Republic of Tajikistan)

2019 ◽  
Vol 98 ◽  
pp. 01011
Author(s):  
Anna Demonova ◽  
Natalia Kharitonova ◽  
Ivan Bragin ◽  
Georgiy Chelnokov ◽  
Vladimir Ivanov
Keyword(s):  
Low Temperature ◽  
Clay Minerals ◽  
Thermal Waters ◽  
Southern Slope ◽  
High Ph ◽  
Subsurface Temperatures

This paper presents data on the composition of the low-enthalpy thermal waters from the unique Khoja-Obi-Garm field located at the central part of the southern slope of the Gissar Range, in the gorge of the Khoja-Obi-Garm River, at an altitude of 1740-1960 meters. In this place, the eponymous SPA-center was built. Groundwaters from springs and boreholes of Khoja-Obi-Garm SPA has temperatures from 57 to 93°C, high pH (up to 8) and low TDS (less than 0.5 g/l). The estimated subsurface temperatures for the same thermal waters vary from 140°C to 156°C and 193-197°C based on the silica and K/Na geothermometer temperatures consequently. These waters belong to Na–SO4–HCO3 type with high content of H2SiO3 (~140 mg/l), F (up to 18 mg/l) and Rn (up to 814 Bq/l). Thermodynamic speciation indicated that these groundwaters are supersaturated with clay minerals and low-temperature zeolites and undersaturated with carbonate and main alumosilicate minerals.

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