Angelo Minissale

Institute of Geosciences and Earth Resources

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Orlando Vaselli

University of Florence

Franco Tassi

University of Florence

Vittorio Duchi

University of Florence

Giordano Montegrossi

Institute of Geosciences and Earth Resources

G. Magro

Institute of Geosciences and Earth Resources

D. Chandrasekharam

Izmir Institute of Technology

C. Verrucchi

University of Florence

Mohamed A. Mattash

University of Aden

Antonella Buccianti

University of Florence

Dario Tedesco

University of Campania "Luigi Vanvitelli"

Cooperative Institutions

University of Florence

National Research Council

Institute of Geosciences and Earth Resources

Istituto Nazionale di Geofisica e Vulcanologia

National Academies of Sciences, Engineering, and Medicine

Instituto de Gastroenterologia de Goiânia

United States Geological Survey

Mineral Resources

Istituto Nazionale di Fisica Nucleare, Sezione di Firenze

University of Bari Aldo Moro

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Karst springs as “natural” pluviometers: Constraints on the isotopic composition of rainfall in the Apennines of central Italy

Applied Geochemistry (2011)

Angelo Minissale Orlando Vaselli

δ18O

Isotopic signature

10.1016/j.apgeochem.2011.02.005

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Citations (48)

Natural fluctuation of sulfur species (SO2, H2S and ) in volcanic fumaroles

Geochimica et Cosmochimica Acta (2006)

Angelo Minissale Giordano Montegrossi Franco Tassi Orlando Vaselli Antonella Buccianti

Fumarole

Volcanic Gases

10.1016/j.gca.2006.06.847

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Citations (0)

Isotopic and chemical assessment of geothermal potential of the Colli Albani area, Latium region, Italy

Applied Geochemistry (1988)

Werner F. Giggenbach Angelo Minissale G. Scandiffio

10.1016/0883-2927(88)90020-0

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Citations (71)

Fluid geochemistry versus tectonic setting: the case study of Morocco

Geological Society London Special Publications (2006)

Franco Tassi Orlando Vaselli Giovanna Moratti Luigi Piccardi Angelo Minissale

Abstract This paper presents the results of an extensive chemical and isotopic investigation on natural thermal and cold fluids (spring waters and associated gases) discharging throughout the main geological domains of Morocco. The chemical features of the thermal springs are mainly dependent on rock dissolution involving Triassic evaporite formations, producing either Na-Cl or Ca-SO 4 composition, although mixing with shallower connate high-saline waters in Neogene post-orogenic sedimentary layers cannot be ruled out. Only in the Moroccan Meseta and Anti-Atlas domains have spring discharges probably undergone equilibration as a result of water-rock interaction in granites. Of the chemical and isotopic features of the gas seeps, 3 He/ 4 He ratios and δ 13 C-CO 2 values indicate the occurrence of a significant contribution of mantle-derived gas, especially at Oulmès (Moroccan Meseta) and Tinejdad-Erfoud (Anti-Atlas), where associated waters are found to equilibrate at relatively high temperatures ( c. 130 °C). These areas are also characterized by the presence of Pliocene to Quaternary basaltic volcanic rocks. Thermal discharges located along the Rif front and related to the NE-SW-oriented main strike-slip faults are associated with a CH 4 - and/or N 2 -rich gas phase, derived respectively from a crustal or an atmospheric source. Some of them have significant contents of 3 He that could indicate the rising of mantle fluids. Such a striking isotopic signature, which is not related to any recent volcanism visible at surface, is likely to be associated with cooling magma at depth related to transpressive fault systems. Similarly, in the northeastern area, the small, although significant, enrichment of 3 He in the gas discharges seeping out along the Nekor seismic active fault and related to Pliocene-Quaternary basalts also suggests a deep-seated (magmatic) contribution. The distribution of thermal discharges is strongly related to the main active tectonic structures of Morocco. Moreover, this study indicates the presence of deep active tectonic structures in areas until now considered as stable. In particular, the NE-SW-trending Nekor fault may be part of a major system that extends to the Moroccan Meseta and into the Smaala-Oulmès fault system, thus emerging as a deep structure with crustal significance.

10.1144/gsl.sp.2006.262.01.08

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Citations (20)

Understanding the evolution of thermal fluids along the western continental margin of India using geochemical and boron isotope signatures

Geothermics (2018)

Trupti Chandrasekhar Angelo Minissale Orlando Vaselli D. Chandrasekharam Hemant Kumar Singh

Isotopes of boron

Trace element

Radiogenic nuclide

10.1016/j.geothermics.2018.03.007

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Citations (29)

Geothermal prospecting by geochemical methods on natural gas and water discharges in the vulsini mts volcanic district (central Italy)

Geothermics (1987)

Vittorio Duchi Angelo Minissale S. Ortino Luca Romani

Prospecting

10.1016/0375-6505(87)90062-9

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Citations (23)

Geothermal prospecting by geochemical methods in the Quaternary volcanic province of Dhamar (central Yemen)

AGU Fall Meeting Abstracts (2010)

Angelo Minissale Orlando Vaselli Mohamed A. Mattash Giordano Montegrossi Franco Tassi

Abstract This paper deals with geothermal prospecting carried out in the Quaternary volcanic field of Dhamar, which is located almost in the centre of the main Oligo-Miocene basaltic trap plateau of Yemen. By applying geochemical and thermometric techniques in domestic wells producing water from the shallow unconfined aquifer in the area, which is prevalently hosted inside the Quaternary volcano-clastic material, a closed thermal anomaly associated with the Quaternary volcanic activity was well delineated. Although the aquifer(s) has a Ca–Na–HCO 3 composition, that is typical of shallow groundwater, there are several chemical anomalies in the hotter central area compared to typical aquifers: i) the p H is lower and, consequently, the calculated partial pressure of CO 2 in solution is higher, ii) the electrical conductivity is higher, iii) the total salinity is higher and iv) the fluoride ion concentration is higher. Such chemical anomalies in the hotter part of the aquifer do not seem to be generated by the rising and/or mixing of deep hydrothermal components rising into the shallow aquifer, but rather produced by enhanced water–rock interaction processes resulting from the higher temperature of the aquifer and its greater acidity. By applying some speculative calculations, based on the likely temperature of rainfall in the area and the depth and temperature of individual wells, the local thermal gradients in the area have been calculated. The thermal gradient varies from less than the average Earth gradient at the periphery of the delimitated thermal anomaly, to more than 250 °C/km, within an extensive area (exceeding 200 km 2 ) where the gradient is greater than 100/120 °C/km.

Prospecting

Source

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Citations (1)

Hydrogeochemistry of the volcanic district in the Tolfa and Sabatini Mountains in central Italy

Journal of Hydrology (1994)

M. Dall’Aglio Vittorio Duchi Angelo Minissale Adolfo Guerrini Marco Tremori

Lithology

Chalcedony

10.1016/0022-1694(94)90217-8

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Citations (22)

Palynological approach in upper Quaternary terrestrial carbonates of central Italy: Anything but a ‘mission impossible’

Sedimentology (2013)

Adèle Bertini Angelo Minissale Marianna Ricci

Abstract A palynological survey has been carried out on two late Quaternary travertine s.l . deposits of central Italy at Serre di Rapolano and Bagnoli (Tuscany region). The principal aim was to improve the understanding of factors that affect the accumulation and preservation of pollen grains in thermal (i.e. travertine) and ambient temperature (i.e. calcareous tufa) terrestrial carbonates. For this purpose, 52 526 pollen grains belonging to 118 pollen taxa from local to extra‐regional sources were analysed in 200 samples from different travertine and calcareous tufa lithofacies. Of these, 97 samples, generally from thermal travertines, were barren in palynomorphs. By contrast, pollen grains in the remaining samples were well‐preserved and did not show differential preservation features. These observations suggest that the p H of the solutions from which travertine or tufa precipitate is not a limiting factor in causing corrosion and/or destruction of pollen grains. Rather, the barrenness recorded in many samples appears to reflect a paucity of pollen rather than post‐depositional destruction. Results suggest that the depositional energy of the environment during the deposition of travertine plays an important role in controlling pollen concentration, as verified in both depressions (lower energy to higher pollen concentration) and slopes (higher energy to lower pollen concentration), respectively. Analysis of pollen data suggests that relatively high depositional temperatures and rates of carbonate deposition are also major limiting factors for efficient accumulation of pollen grains. Results of this study reveal that understanding pollen taphonomy processes in travertine and calcareous tufa is critical to developing accurate palaeoenvironmental and palaeoclimatic reconstructions.

Tufa

Taphonomy

Deposition

10.1111/sed.12079

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Citations (18)

Chemical and isotopic study of thermal springs and gas discharges from Sierra de Chiapas, Mexico

Geofísica Internacional (2005)

A. Nencetti Franco Tassi Orlando Vaselli José Luis Macías G. Magro

La Sierra de Chiapas localizada en el Sureste de México, se caracteriza por la presencia de descargas de gas y agua. La mayoría de los manantiales termales se asocian a rocas volcánicas Terciarias a lo largo de fallas regionales con orientación NOSE. Las descargas termales se dividen en cuatro grupos: i) aguas con composición Na-Cl y Sólidos Disueltos Totales (SDT) >3000 mg/L; ii) aguas con composición Ca- y valores de SDT entre 1400 y 2300 mg/L; iii) aguas con composición Na-Cl, bajos contenidos de SDT (800 2400 mg/L) y un contenido de sulfato alto (hasta 650 mg/L) y iv) aguas con una composición Ca- y salinidad baja (SDT <250mg/L). La mayoría de estas aguas están asociadas con descargas de gas compuestas por (hasta 93 % en vol.), (2.4-31.2 % en vol.) y Ar (hasta 1.25 % en vol.) con origen predominantemente meteórico. aparece únicamente en las muestras de gas colectadas en El Azufre (hasta 1.1 % en vol.). Los valores de Î´13C- comúnmente inferiores a -9.7% (PDB) sugieren un origen parcialmente biogénico del . Los parámetros químicos e isotópicos de los manantiales indican que la circulación de fluidos en la Sierra de Chiapas se regula principalmente por la infiltración de aguas meteóricas en rocas carbonatadas del Cretácico medio-tardío hasta las formaciones evaporíticas del Jurásico tardío-Cretácico temprano. Estas últimas representan la fuente principal de las especies en solución de las aguas. No se encontraron evidencias de la presencia de sistemas con entalpías medias a altas por debajo de la Sierra de Chiapas.

10.22201/igeof.00167169p.2005.44.1.551

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Citations (7)