Intrusion-Related Geothermal Systems

Stimac, James A.; Goff, Fraser; Goff, Cathy J.

doi:10.1016/b978-0-12-385938-9.00046-8

Cited by 40 publications

(50 citation statements)

References 10 publications

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“…The relationship between high surface heat flow areas and magma emplacement in the continental crust is well documented in the literature (Allis et al, 1995;Baldi et al, 1994;Cathles, Erendi, & Barrie, 1997;Gianelli, Manzella, & Puxeddu, 1997;Gupta, 1981;Reiter, Chamberlain, & Love, 2010;Stimac, Goff, & Wohletz, 1997). The increase of surface heat flow is particularly elevated when magma emplacement takes place at shallow depth (e.g., Stimac, Goff, & Goff, 2015). To quantify this effect, thermal modelling has been performed by considering both (i) conductive (Allis et al, 1995;Dalrymple et al, 1999;Rikitake, 1995;Stimac et al, 2001) and (ii) convective heat transfer (e.g., Dalrymple et al, 1999;Stimac et al, 2001).…”

Section: Introductionmentioning

confidence: 99%

Regional thermo-rheological field related to granite emplacement in the upper crust: implications for the Larderello area (Tuscany, Italy)

2018

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We modelled thermo-rheological perturbations, related to the emplacement of a magmatic body in the upper crust. This approach was considered relevant for the areas characterized by elevated surface heat flow and chiefly for the geothermal fields. The numerical conductive thermal model applied to the Larderello geothermal area in Tuscany, allowed to constrain size, depth and timing of emplacement of the pluton. We inferred that the emplacement of a magmatic body, at a minimum depth of 3 km, having a horizontal extension of 14 km and a maximum thickness of 8 km, can reasonably reproduce the observed regional surface heat flow anomaly of the Larderello area, when 300 (± 100) kyr are elapsed from the magma emplacement. Even assuming an incremental growth, the first magma injection should not be older than 1 ± 0.3 Ma.Results of the thermal model were used to set up a rheological model and to simulate the drifting of the brittle-ductile transition during the cooling of the pluton. A comparison with the K-horizon profile, a prominent seismic reflector in the Larderello area, was then performed. It was found that the K-horizon approximately corresponds with the pluton roof and with the current location of the brittle-ductile transition.ARTICLE HISTORY

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Section: Introductionmentioning

confidence: 99%

Regional thermo-rheological field related to granite emplacement in the upper crust: implications for the Larderello area (Tuscany, Italy)

2018

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“…In both cases, subsurface fluid-dynamics are strongly influenced by the presence of architectural elements that can store, conduct or entrap fluids such as water, oil and gas (e.g. Schutter, 2003;Stimac et al, 2015). Here we present two models to illustrate possible combinations of architectural elements that favour the formation of petroleum accumulations and geothermal fields in association with volcanism.…”

Section: Implications For Geoenergy Resourcesmentioning

confidence: 99%

“…H2S) if the host rocks, or the original magma was enriched in sulphur (e.g. Iacono-Marziano et al, 2013;Stimac et al, 2015;Robertson et al, 2015;Arnórsson et al, 2015). Magma emplaced in carbonate rocks can release CO2 (e.g.…”

Section: Petroleum Elements Of the Emplacement Stagementioning

confidence: 99%

“…Key elements and processes for geothermal systems are: a source of heat (typically magma or hot igneous rocks), a reservoir body (which can be fractured or porous), water (vapour or liquid), and a permeable network to transfer fluids and heat through the system (e.g. Goff and Janik, 1999;Stimac et al, 2015;Sydnes et al, 2017). Magma emplaced in sedimentary basins can provide these conditions and form hydrothermal systems that are prolific producers for geothermal energy (Jiachao, 2012;Iyer et al, 2013;Procesi et al, 2019).…”

Section: Conceptual Intrusion-related Hydrothermal Systems In Monogenmentioning

confidence: 99%

“…Procesi et al, 2019). These systems are considered the hottest (220 o to 350 o C) and most prolific producers for geothermal energy (Stimac et al, 2015). Basaltic intrusions in sedimentary basins (e.g.…”

Section: Conceptual Intrusion-related Hydrothermal Systems In Monogenmentioning

confidence: 99%

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Stratigraphy of Architectural Elements of a Buried Monogenetic Volcanic System and Implications for Geoenergy Exploration

Bischoff¹,

Nicol²,

Cole³

et al. 2019

Preprint

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Large volumes of magma emplaced and deposited within sedimentary basins can have an impact on their architectural style and geological evolution. Over the last decade, continuous improvement in techniques such as seismic volcano-stratigraphy and 3D seismic visualization of igneous rocks buried in sedimentary basins has helped increase knowledge about these “volcanic basins”. Here, we unravel the complete architecture of the Maahunui Volcanic System (MVS), a middle Miocene monogenetic volcanic field now buried in the offshore Canterbury Basin, South Island of New Zealand. We show the location, geometry, size, and stratigraphic relationships between 25 main intrusive, eruptive, and sedimentary architectural elements in a comprehensive volcano-stratigraphic framework that explains the evolution of the MVS from emplacement to complete burial. The plumbing system of the MVS comprises of seven main architectural elements, including saucer-shaped sills, dikes and sills swarms, minor stocks and laccoliths, and pre-eruptive strata deformed by intrusions. These endogenous elements occur in five distinctive plumbing-types, controlled by the emplacement depth, and by the geometric relationships between the intrusions and the enclosing strata. The exogenous volcanic architecture is defined by a combination of eruptive and associated sedimentary architectural elements, with minor and localized shallow intrusions. Characteristic volcano-types of the MVS are interpreted as the deep-water equivalents of crater and cone-type volcanoes. Crater-type volcanoes have eight main architectural elements (i.e. root zone, lower and upper diatreme, tephra ring, tephra plain, intra-crater cones, overspill wedge and tephra fallow carpet). Cone-type volcanoes have five main architectural elements (i.e. basal cone, central crater, tephra flank, cone apron and tephra fallout carpet). After volcanism has ceased, the process of degradation and burial of the volcanic edifices produces five main sedimentary architectural elements (i.e. inter-cone plains, epiclastic plumes, canyons and gullies, burial domes and seamount-edge fans). Understanding the relationships between these diverse architectural elements allow us to reconstruct the complete architecture of the MVS, and to recognize the main volcano-stratigraphic trends in the study area. The characterisation of architectural elements of the MVS can be applied to explore opportunities to find valuable geoenergy resources such as oil, gas and geothermal energy with buried and active monogenetic volcanic systems.

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The Geology of Hot Springs

Erfurt¹

2021

The Geoheritage of Hot Springs

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Intrusion-Related Geothermal Systems

Cited by 40 publications

References 10 publications

Regional thermo-rheological field related to granite emplacement in the upper crust: implications for the Larderello area (Tuscany, Italy)

Regional thermo-rheological field related to granite emplacement in the upper crust: implications for the Larderello area (Tuscany, Italy)

Stratigraphy of Architectural Elements of a Buried Monogenetic Volcanic System and Implications for Geoenergy Exploration

The Geology of Hot Springs

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