Journal ArticleDOI
Multi-stage fluid circulation in a hydraulic fracture breccia of the Larderello geothermal field (Italy)
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In this article, a 20-cm-thick hydraulic fracture breccia unit at a depth of 1090 m below ground level (bgl) has been studied in the Larderello geothermal field.About:
This article is published in Journal of Volcanology and Geothermal Research.The article was published on 1999-06-01. It has received 32 citations till now. The article focuses on the topics: Fluid inclusions & Anhydrite.read more
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Journal ArticleDOI
Epidote in Geothermal Systems
TL;DR: In the early 20th century, it was readily recognized as a common rock-forming mineral of metamorphic and hydrothermal processes as discussed by the authors, and its distribution is widespread in the Earth's crust, including metamorphics of pumpellyite-prehnite, greenschist, epidote-amphibolite, and blueschist facies.
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Enhanced CO2-mineral sequestration by cyclic hydraulic fracturing and Si-rich fluid infiltration into serpentinites at Malentrata (Tuscany, Italy)
TL;DR: The Magnesite deposits of Malentrata (Tuscany, Italy) were derived from serpentinite silicification-carbonation of the Ligurian ophiolite, and represent a natural analogue of in situ CO 2 mineral sequestration as mentioned in this paper.
Journal ArticleDOI
Heat flow, deep temperatures and extensional structures in the Larderello Geothermal Field (Italy): constraints on geothermal fluid flow
TL;DR: The Larderello geothermal field is located in the inner Northern Apennines (southern Tuscany), an area which has been affected by extensional tectonics since the Early-Middle Miocene as mentioned in this paper.
Journal ArticleDOI
Zebra dolomitization as a result of focused fluid flow in the Rocky Mountains Fold and Thrust Belt, Canada
Veerle Vandeginste,Rudy Swennen,Sarah A. Gleeson,Rob M. Ellam,Kirk G. Osadetz,François Roure +5 more
TL;DR: In this article, a diagenetic cyclicity was found in the zebra dolomites of the Middle Cambrian Cathedral and Eldon Formations of the Main Ranges of the Canadian Rocky Mountains Fold and Thrust Belt.
Journal ArticleDOI
Helium isotopes in paleofluids and present‐day fluids of the Larderello geothermal field: Constraints on the heat source
Abstract: [1] The He isotope composition of paleofluids entrapped in fluid inclusions of hydrothermal minerals is compared with the present-day fluid composition of the Larderello geothermal field. Almost constant values of (3He/4He)m/(3He/4He)air (=R/Ra) over time indicate that no important changes have occurred in the deep source of gases, at least during the last 3.8 million years. On a regional scale, a correlation has been found between the R/Ra spatial distribution, heat flow, and Bouguer gravity anomaly. High values of R/Ra and heat flow, and low Bouguer anomaly values indicate that the Larderello field is an area of preferential escape for mantle-derived fluids. A positive correlation has also been found between the R/Ra spatial distribution and a major seismic reflector named the “K horizon.” A deep magma source, refilled by periodic gas input from the mantle, is the most likely source of 3He-enriched fluids and the anomalously high heat flow. The nearly constant value of R/Ra clearly indicates that input of fresh mantle material has occurred up to recent times. Clear evidence of mixing between mantle and crustal fluids indicates that the high R/Ra is the lower limit of the actual mantle value, which is suggested to be similar to the subcontinental European mantle. The decrease of R/Ra over time in the peripheral part of the Larderello field indicates that important changes in the feeding fracture system and/or cooling rate have occurred in these areas.
References
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MonographDOI
Systematics of fluid inclusions in diagenetic minerals
TL;DR: The use of fluid inclusions as a means of understanding the physical and chemical history of fluids in sedimentary basins, but it also has revealed important limitations which have required that a new approach must be employed to effectively use fluid-inclusions.
Journal ArticleDOI
Mechanics of Hydraulic Fracturing
M. King Hubbert,David G. Willis +1 more
TL;DR: A theoretical examination of the fracturing of rocks by means of pressure applied in boreholes leads to the conclusion that, regardless of whether the fracturing fluid is of the penetrating or non-penetrating type, the fractures produced should be approximately perpendicular to the axis of least stress as mentioned in this paper.
Mechanics of hydraulic fracturing
M.K. Hubbert,D.G. Willis +1 more
TL;DR: In this article, a theoretical analysis of the fracturing of rocks by means of pressure applied in boreholes leads to the conclusion that, regardless of whether the fracturing fluid is of the penetrating or non-penetrating type, the fractures produced should be approx. perpendicular to the axis of least stress.
Journal ArticleDOI
Cation Site occupancy in chlorites and illites as a function of temperature
TL;DR: The relationship between the composition and the crystallization temperature of chlorites and illites has been investigated in different geothermal fields and in particular the Los Azufres system in Mexico, considered to be a natural analogue to experimental laboratories.
Journal ArticleDOI
Determination of the homogenization temperatures and densities of supercritical fluids in the system NaClKClCaCl2H2O using synthetic fluid inclusions
Yi-Gang Zhang,John D. Frantz +1 more
TL;DR: In this paper, the homogenization temperatures of the synthetic fluid inclusions were analyzed by micro-thermometry, and the results of these experiments compare favorably to previously published ones; however, they do not consider solutes containing more than one solute.