The Influence of Basement on Surface Heat Flow in the Cooper Basin

Beardsmore, Graeme

doi:10.1071/eg04223

Cited by 32 publications

(23 citation statements)

References 9 publications

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“…Two most noticeable examples to this are the low heat flow in the central part of Tangerang High and an exceptionally high heat flow in the southern part of the Rengasdengklok High (between Ciputat and Pasirputih Sub-basins). This demonstrates that the effect of heat refraction (Beardsmore 2004;Thakur et al 2012;Rawling et al 2013; "General description of heat flow density distribution" section), i.e., where heat flows more preferably along thermally conductive zones rather than it does along insulating ones, prevails on these regions. This explains why the computed HFD in the southern Rengasdengklok High is .…”

Section: Discussionmentioning

confidence: 87%

“…Other authors (e.g., Beardsmore 2004;Stuwe 2007) prefer a different type of proportionality to use as the denominator in Eq. 1a, as that adopted in this study:…”

Section: Numerical Modeling Of Subsurface Temperature Distributionmentioning

confidence: 99%

“…7), thereby reducing the chance of triggering significant and deeply circulating groundwater flow within the basin. In this case, the numerical modeling of temperature distribution may be carried out conveniently by considering only conductive heat transfer (e.g., Beardsmore 2004;Mottaghy et al 2011).…”

Section: Numerical Modeling Of Subsurface Temperature Distributionmentioning

confidence: 99%

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Thermal modeling and heat flow density interpretation of the onshore Northwest Java Basin, Indonesia

2016

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Section: Discussionmentioning

confidence: 87%

“…Other authors (e.g., Beardsmore 2004;Stuwe 2007) prefer a different type of proportionality to use as the denominator in Eq. 1a, as that adopted in this study:…”

Section: Numerical Modeling Of Subsurface Temperature Distributionmentioning

confidence: 99%

Section: Numerical Modeling Of Subsurface Temperature Distributionmentioning

confidence: 99%

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Thermal modeling and heat flow density interpretation of the onshore Northwest Java Basin, Indonesia

2016

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“…The BLS intrusion has been variably described as granitic (Big Lake 1 and Moomba 1; Gatehouse, 1986, McLaren andDunlap, 2006) and granodioritic (Gatehouse, 1986;Beardsmore, 2004); images BLS granites plot as an S-type (Boucher, 2003); however, according to Wyborn (1994) the granites are in fact 'a rare I-type', with a their low P 2 O 5 content indicating a felsic source parentage.…”

Section: Big Lake Suitementioning

confidence: 99%

“…Development of the BLS EGS ( Fig. 1.2) began in 2002 and has been cited as the most prospective HDR resource worldwide (Swenson et al, 2000;Beardsmore, 2004;Wyborn, 2008).…”

Section: Experimental Rationale and Objectivesmentioning

confidence: 99%

Petrological, geochemical and geochronological characterisation of heat-producing granites

Marshall¹

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Granitic magma generation has the ability to strongly differentiate the continental crust and concentrate elements such as the heat-producing elements (HPE) uranium (U), thorium (Th) and potassium (K). These elements can be enriched above average upper continental crustal values, and these granites are referred to as moderately (4-8 µW/m 3 ) or high (>8 µW/m 3 ) heat-producing granites (HHPGs); when overlain by insulating sedimentary cover these may be considered a target for enhanced geothermal systems (EGS).The composition of the source, and differentiation during magma ascent and emplacement, can influence the magmatic elemental budget, as can the accessory mineral assemblage, tectonic setting and history of regional magmatism. It is of importance to investigate whether there is a combination of these factors that promotes HPE enrichment and, if so, can these factors be used to provide a criteria for HHPGs prospective for future EGS development?To address the relative influence of factors on the ability to affect elemental enrichments three HHPG examples with an established history in EGS development studies were selected: the Big Lake Suite (BLS), South Australia; Cornwall, UK; and Soultz-sous-Forêts (Soultz), France. These sites represent the three most common granite types: A-, S-and I-type, respectively. Comparing their mineralogy, major and trace element abundances, and zircon geochemistry and associated U/Pb ages will inform the timing and controls on enrichment at each location. iii an enriched source. The emplacement ages for BLS samples range from 325 ± 2 Ma to 312 ± 2 Ma; this spread in ages implies continual granite emplacement over ~13 Myr. Some zircons dating to the time of emplacement record extreme U (>5000 ppm) and Th (4000 ppm) enrichments.Inherited zircon populations were also dated in European analogues: 363 ± 9 Ma, 408 ± 9 Ma and 420 ± 6 Ma (Cornwall) and 426 ± 14 Ma ages (Soultz) are associated with granite emplacement in a syn-collisional environment during closure of the Rheic Ocean. Although some inherited grains inCornwall record high Th contents (~800 ppm), extreme enrichments (>6000 ppm U) are analysed in some emplacement-aged grains. Th enrichment (~1600 ppm) is observed in emplacement-aged zircons in Soultz.Zircon locations in thin section were studied to address where these extreme enrichments could have developed. Zircons bordering mineral boundaries or adjacent to phenocrysts likely crystallised in differentiated chemical boundary layers, and elemental abundances in these regions would have been different to those of the pluton as a whole. Localised enrichment could explain the extreme enrichments present in some emplacement-aged zircons; the extreme levels of differentiation required to attain these enrichments -up to 99% -are not plausible on a pluton scale. Zircons armoured within earlier crystallising mafic silicates (e.g., biotite) would not have been exposed to these extreme enrichments, and this could account for the range of elemental abundances recorded in empl...

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Crustal Structure and Geothermal Mechanism of the Gonghe-Guide Basin Based on EIGEN-6C4 Satellite Gravity and Aeromagnetic Data

Zhou

Zhang

et al. 2023

Pure Appl. Geophys.

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Gonghe-Guide Basin is situated in the northeastern edge of the Tibetan Plateau. one of China's main targets for geothermal research and exploitation. It is also a crucial region for studying the Tibetan Plateau's uplift mechanisms. Therefore, the elaborate crustal structure of the entire basin is essential for recognizing the geothermal mechanisms, geothermal source targets and even the uplift mechanisms of the Tibetan Plateau. However, these issues remain enigmatic, partly because it is di cult to depict the crustal structure of entire base by using the pro le results of magnetotelluric and seismic data. To overcome the limitations of pro le results, we present a new crustal structure of the entire Gonghe-Guide Basin by using EIGEN-6C4 satellite gravity and aeromagnetic data. The gravity and magnetic data were processed using the wavelet multi-scale decomposition method and the iterative compact depth from extreme points imaging method. Satisfactory residual anomalies and inversion results were obtained.The gravity inversion results reveal pronounced low-density regions at the depths of 15-35 km in the middle-upper crustal, most likely caused by partial melting from heating the overlying hot dry rocks. The results correspond well with the magnetotelluric and seismic results and are an effective supplement. The magnetic inversion results show negative or no magnetism within a similar depth range. But at shallow depths of the same horizontal positions, there is high positive magnetism, which can be interpreted as granite. To con rm and validate this conclusion, a 2D geologic model of a pro le from a typical area is created to show the detailed tectonic. Based on the new crustal structure results, the suggested geothermal target is the low/negative density corresponding to low/negative magnetism located at deep depths and high/ positive magnetism located at shallow depths. These density and magnetism anomalies are primarily located near the town of Guide, Gonghe, Xinjie, Chaka, Wayuxiangka, Tanggemu, Xinhai, which can be considered geothermal source targets. The geothermal source is thought to be due to mantle material upwelling or faults activity causing partial melting in the crust, and heat ows from deep to shallow along the faults in the region. Then we established a geological conceptual model to illustrate this process. This indicates that tectonic movement is taking place in the deep part of the earth in Gonghe-Guide Basin. The research on the geological structure and geothermal heat source mechanism in the Gonghe-Guide Basin can provide a primary reference for research on geothermal resources in other areas with similar geological structures.

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The Influence of Basement on Surface Heat Flow in the Cooper Basin

Cited by 32 publications

References 9 publications

Thermal modeling and heat flow density interpretation of the onshore Northwest Java Basin, Indonesia

Thermal modeling and heat flow density interpretation of the onshore Northwest Java Basin, Indonesia

Petrological, geochemical and geochronological characterisation of heat-producing granites

Crustal Structure and Geothermal Mechanism of the Gonghe-Guide Basin Based on EIGEN-6C4 Satellite Gravity and Aeromagnetic Data

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