Hydrogeochemistry and Precursory Anomalies in Thermal Springs of Fujian (Southeastern China) Associated with Earthquakes in the Taiwan Strait

Analyzing the hydrochemical composition in thermal springs is an advantageous method for studying the coupling mechanism of the deep and shallow fluids in active fault zones. Here we conducted sampling in 30 thermal springs near fault zones in Fujian Province, and the major elements, trace elements, silica, stable isotopes (δD and δ18O) and strontium isotopes were tested in the laboratory. The results show that (1) the thermal springs in the study area can be divided into six types according to the content of the major elements: HCO3-Na, HCO3·SO4-Na, Cl·HCO3-Na, Cl-Na, Cl-Na·Ca and HCO3·SO4-Ca; (2) hydrogen and oxygen isotopes indicate that precipitation is the main source of recharge for thermal springs in the study area, and the recharge height is between 258 m and 1859 m; (3) the content of SiO2 in the thermal spring varies from 18.1 mg/L to 59.3 mg/L. The geothermal reservoir temperature calculated is 90~226 °C, and the circulation depth is 2.9~5.4 km, except for the W10 thermal spring, whose circulation depth is 8.4 km; and (4) the 87Sr/86Sr of the thermal springs in southwestern Fujian and eastern Fujian has obviously different characteristics, indicating the influence of different rock formations on the groundwater cycle process. Additionally, a continuous measurement of the main anions and cations was performed in five thermal springs every three days since January 2020. There were obvious abnormal changes in the hydrochemical compositions, chlorine in four of the five springs, sodium at three springs, and four ions at one spring, which all showed abnormal high-value changes by 15% to 80%, and which occurred 85~168 days prior to the M6.1 earthquake in Hualien, Taiwan. An inspiration could be provided for obtaining effective earthquake precursor anomalies by monitoring the change in ion concentration in thermal springs.

Draft Genome Sequence of Schnuerera sp. Strain xch1, Isolated from the Tibetan Plateau

In this study, we report the draft genome sequence of Schnuerera sp. strain xch1, which was isolated from a high-altitude thermal spring on the Tibetan Plateau. The enzymes and metabolic pathways of the strain may have further applications in biomass technology.

Bacterial Diversity and CAZyme Potential Revealed in Pandanus Rich Thermal Spring Cluster of India: A Non-cultivable 16S rRNA Sequencing Approach

In the present study, we explored four different geothermal spots of the Deulajhari spring cluster at a proximity of 10–20 meters with temperatures of 43 to 65°C to unravel their genesis, bacterial diversity and CAZyme potential. However, minor variations in physicochemical properties; TOC, sodium, chloride, zinc and nitrate were observed, including the pH of the spring openings. Illumina based amplicon sequencing revealed Firmicutes, Proteobacteria and Chloroflexi as the major bacterial phylum with higher abundance in the DJ04 sample. The alpha diversity of all the springs was almost same, whereas beta diversity revealed variations in the degree of uniqueness of OTUs at different temperatures. Statistical analysis established a positive correlation between sulfur content with Heliobacterium, Thermodesulfovibrio, Thermodesulfobacterium and Herpetosipho as well as TOC and HCO3 with Thermoanaerobacter, Desulfovibrio, Candidatus solibacter and Dehalogenimona. The major hydrocarbon family genes and Carbohydrate Active Enzyme pathways were predicted to be highest in DJ04 with elevated concentrations of HCO3 and TOC. Higher homogeneity in geo-physicochemical and microbial features direct the possibility of the common origin of these springs through plumbing systems. However, the minor variations in diversity and functionality were due to variations in temperature in spring openings through the mixing of subsurface water contaminated with carbohydrates from leaf biomass litter. Functional characterization of the thermophilic bacteria of this spring provides essential scope for further industrial applications. The biogeochemical reasons hypothesized for the genesis of unique multiple openings in the cluster are also of interest to conservation scientists for taking measures toward necessary laws and regulations to protect and preserve these springs.

The Cult of Sulis-Minerva at Bath: The Religious Ritual of the Patron Goddess at Bath

<p>The Roman City of Bath, also known as Aqua Sulis, lies in the modern British county of Somerset in the south-east of England. During the Roman occupation of ancient Britain, Bath became a significant Roman town centred on a large religious complex. As the Roman city lies underneath the modern city Bath, excavation of both the temple complex has been difficult. To add further problems, Bath was only mentioned in one ancient source, Solinus. Consequently, there is a large gap in the knowledge we have about Roman Bath and its patron goddess. As such a large Romano-Celtic temple complex, Sulis’ cult has important contributions to religion in Roman Britain. Subsequently, studying and understanding Sulis’ cult is important to the study of Roman Britain. This thesis discusses features of Sulis’ cult and what this may tell us about the goddess’s attributes as well as how her cult functioned. The large Romano-Celtic temple was functional from c.65 to c.400 CE. However, there is evidence which would suggest that Sulis was worshipped by the ancient Britons before the Romans had a permanent presence in Britain. This thesis will place Roman Bath within the wider context of Romano-British history, outlining how it functioned through architecture and evidence for the temple’s gradual decline. Scholarship has agreed that Sulis is a Celtic deity who was worshipped by the Celts before the Romans arrived in Britain. Through Roman religious sensibilities, Sulis was conflated with the Roman goddess Minerva. Most of the physical remains at Bath are architectural features, votive offerings and altars. Many links have been drawn between Sulis and her thermal spring. For example, Sulis-Minerva has been regarded as an important healing divinity and her temple complex a place people can go for healing. This thesis will discuss Sulis and her connection to the goddess Minerva as well as what the goddess’s relationship was to the Romans and Britons. Attention has been drawn to a large cache of 130 Latin defixiones, or curse tablets, discovered in Sulis’ spring. The curses most commonly beseech Sulis to hunt down a culprit and punish them. The defixiones constitute an important source of evidence regarding to Sulis’ attributes. There has been some debate as to the nature of these curse tablets as there have been suggestions that they read more as ‘prayers for justice’. This thesis will explore the idea that the tablets acted as a medium for a devotee to ask the goddess for retribution against a perceived wrong. A comparison will be drawn between Bath’s curse tablets and other forms of Roman prayers comparing the two. As of now, the defixiones contribute a large portion of evidence towards religious life at Bath. Sulis represents hybridization between two ancient civilizations. On the one hand, Sulis had strong roots to ancient British religion but after Roman occupation her cult became predominantly Roman in form. I will discuss the remaining aspects of Celtic religion at Bath, such as in the Gorgon pediment, and how this was changed under Roman rule.</p>

The Cult of Sulis-Minerva at Bath: The Religious Ritual of the Patron Goddess at Bath

<p>The Roman City of Bath, also known as Aqua Sulis, lies in the modern British county of Somerset in the south-east of England. During the Roman occupation of ancient Britain, Bath became a significant Roman town centred on a large religious complex. As the Roman city lies underneath the modern city Bath, excavation of both the temple complex has been difficult. To add further problems, Bath was only mentioned in one ancient source, Solinus. Consequently, there is a large gap in the knowledge we have about Roman Bath and its patron goddess. As such a large Romano-Celtic temple complex, Sulis’ cult has important contributions to religion in Roman Britain. Subsequently, studying and understanding Sulis’ cult is important to the study of Roman Britain. This thesis discusses features of Sulis’ cult and what this may tell us about the goddess’s attributes as well as how her cult functioned. The large Romano-Celtic temple was functional from c.65 to c.400 CE. However, there is evidence which would suggest that Sulis was worshipped by the ancient Britons before the Romans had a permanent presence in Britain. This thesis will place Roman Bath within the wider context of Romano-British history, outlining how it functioned through architecture and evidence for the temple’s gradual decline. Scholarship has agreed that Sulis is a Celtic deity who was worshipped by the Celts before the Romans arrived in Britain. Through Roman religious sensibilities, Sulis was conflated with the Roman goddess Minerva. Most of the physical remains at Bath are architectural features, votive offerings and altars. Many links have been drawn between Sulis and her thermal spring. For example, Sulis-Minerva has been regarded as an important healing divinity and her temple complex a place people can go for healing. This thesis will discuss Sulis and her connection to the goddess Minerva as well as what the goddess’s relationship was to the Romans and Britons. Attention has been drawn to a large cache of 130 Latin defixiones, or curse tablets, discovered in Sulis’ spring. The curses most commonly beseech Sulis to hunt down a culprit and punish them. The defixiones constitute an important source of evidence regarding to Sulis’ attributes. There has been some debate as to the nature of these curse tablets as there have been suggestions that they read more as ‘prayers for justice’. This thesis will explore the idea that the tablets acted as a medium for a devotee to ask the goddess for retribution against a perceived wrong. A comparison will be drawn between Bath’s curse tablets and other forms of Roman prayers comparing the two. As of now, the defixiones contribute a large portion of evidence towards religious life at Bath. Sulis represents hybridization between two ancient civilizations. On the one hand, Sulis had strong roots to ancient British religion but after Roman occupation her cult became predominantly Roman in form. I will discuss the remaining aspects of Celtic religion at Bath, such as in the Gorgon pediment, and how this was changed under Roman rule.</p>

The thermal waters in Sofia City (Bulgaria): importance, condition and problems

Sofia, the capital of Bulgaria, is situated in a region rich in thermal waters, which were a major factor for the establishment and development of the city. The thermal spring in the city center of Sofia has been in use since ancient times. As the city expanded rapidly in the 19th and 20th centuries, it absorbed many other sources of thermal water. In addition, the available volume of usable thermal water increased with the construction of abstraction wells. The prevailing types of thermal waters are sourced from Mesozoic rocks at the base of the Sofia graben. The water temperatures are in the range between 21 °C and 54 °C, and the mineralization is up to approximately 1 g/L total dissolved solids (TDS). There is only one source in deeper rock formations with approximately 4 g/L TDS. The population of the city utilizes the thermal water resources to a various degree, mainly for bottling of natural mineral water. Some sources are used for balneology, sport, recreation and sanitation; however, their potential is not sufficiently utilized. Considering the importance of the thermal water resources for the city and its population, a numerical model was set up to study the impact of subway construction on the thermal spring in the center of Sofia.

Hydrogeochemistry of the Thermal Springs of Pojqpoquella and Phutina, Puno, Peru

This paper deals with the results of a hydrogeochemical study of two thermal springs that originate from in very high altitudes in southwestern Peru with outflow temperatures of maximal 38,4 °C and flow rates of 1.08 - 2.02 l/s. Water samples from the Pojqpoquella and Phutina geothermal wells, were collected during the period between September 2018 and January 2019 in the main area of Puno. Chemical types of the thermal spring are Na+, Ca2+, Cl- and CO 3 2 − in Ayaviri and Putina. According to the Piper and Schoeller diagrams for the Pojqpoquella thermal spring water is classified as Na++ K+ (75 %) and Cl- (60 %) type water while that of the Phutina thermal spring is classified as Na++ K+ (76 %) and Cl- (72 %) type water. The electrical conductivity (EC) values for the Pojqpoquella and Phutina thermal spring waters is 2160 - 3142 μS/cm and 3160 - 3184 μS/cm, respectively, the thermal spring waters have a high electrical conductivity which shows that it has interacted with the host rock for a long time. The reservoir rocks of the Pojqpoquella thermal system consist of a red sandstones and conglomerate rocks while the reservoir rocks of the Phutina thermal system consist of a thick sequence of cretaceous rocks.

Chemical component depositions in the microbial mats and travertine in the Khoito-Gol thermal spring (Eastern Sayan)

The results of studies of the chemical composition of water, travertine, and microbial mats in the Khoito-Gol mineral spring (Eastern Sayan) are presented. It was shown that the formation of mineral deposits, travertine, and microbial mat is connected with the active functioning of microorganisms and geological and geodynamic conditions. It has been revealed that the diversity of cyanobacterial and sulfur microbial mats increases as the distance from the springs of the thermal water grows. Microbial mats are hardened with carbonates being converted into solid travertine crusts that are built upon the top of older structures to form multi-meter domes. The concentration function of the microbial mats and thermal water showed higher coefficients of accumulation of nickel and beryllium.

Draft Genome Sequences of Two Cyanobacteria Leptolyngbya spp. Isolated from Microbial Mats in Miravalles Thermal Spring, Costa Rica

We report the draft genome sequences of Leptolyngbya sp. strain 7M and Leptolyngbya sp. strain 15MV, isolated from Miravalles Thermal Spring, Costa Rica. The thermophilic cyanobacteria exhibit unique diversity features that provide insight into the adaptation and evolution of phototrophic microorganisms in geothermal habitats.

Characterising thermal water circulation in fractured bedrock using a multidisciplinary approach: a case study of St. Gorman’s Well, Ireland

A hydrogeological conceptual model of the source, circulation pathways and temporal variation of a low-enthalpy thermal spring in a fractured limestone setting is derived from a multidisciplinary approach. St. Gorman’s Well is a thermal spring in east-central Ireland with a complex and variable temperature profile (maximum of 21.8 °C). Geophysical data from a three-dimensional(3D)audio-magnetotelluric(AMT) survey are combined with time-lapse hydrogeological data and information from a previously published hydrochemical analysis to investigate the operation of this intriguing hydrothermal system. Hydrochemical analysis and time-lapse measurements suggest that the thermal waters flow within the fractured limestones of the Carboniferous Dublin Basin at all times but display variability in discharge and temperature. The 3D electrical resistivity model of the subsurface revealed two prominent structures: (1) a NW-aligned faulted contact between two limestone lithologies; and (2) a dissolutionally enhanced, N-aligned, fault of probable Cenozoic age. The intersection of these two structures, which has allowed for karstification of the limestone bedrock, has created conduits facilitating the operation of relatively deep hydrothermal circulation (likely estimated depths between 240 and 1,000 m) within the limestone succession of the Dublin Basin. The results of this study support a hypothesis that the maximum temperature and simultaneous increased discharge observed at St. Gorman’s Well each winter is the result of rapid infiltration, heating and recirculation of meteoric waters within a structurally controlled hydrothermal circulation system.