Decoupled thermal and mantle helium anomalies: Implications for the transport regime in continental rift zones

Clauser, Christoph; Griesshaber, Erika; Neugebauer, Horst J.

doi:10.1029/2001jb000675

Cited by 41 publications

(48 citation statements)

References 80 publications

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“…The positive correlation between surface heat flow anomalies and mantle‐derived gas anomalies appears to be fairly consistent on a continental scale (Polyak & Tolstikhin, 1985). At regional or local scales, however, the observed anomalies are often decoupled, as a result of the fairly different transport mechanisms of helium and heat (O’Nions & Oxburgh, 1983; Torgersen & Jenkins 1982;Clauser et al. 2002; Castro et al.…”

Section: Discussionmentioning

confidence: 99%

Noble gas and boron isotopic signatures of the Bacon‐Manito geothermal fluid, Philippines

Bayon¹,

See²,

Magro

et al. 2008

Geofluids

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Noble gas isotopic composition and abundances were determined on dry gas sampled in geothermal wells from the Bacon-Manito (BGPF) geothermal field in the Philippines. The most significant findings come from the 3 He ⁄ 4 He ratio; a mantle-He source is evidenced by ratio close to 7 Ra. Peripheral fluid from the west and south of the geothermal system is relatively enriched in 4 He (R ⁄ Ra slightly > 2), most probably sourced from U and Th decay in old igneous or crustal rocks. The two end-members mix, producing the range of R ⁄ Ra ratios observed in the other wells included in this study. Preliminary data on the d 11 B signature of the Bacon Manito fluid separated from vapour range from 7& to 9&. These values suggest that the local magmatic rocks could represent the main boron source, in agreement with the boron isotopic signature of Pacific arc lavas.

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Section: Discussionmentioning

confidence: 99%

Noble gas and boron isotopic signatures of the Bacon‐Manito geothermal fluid, Philippines

Bayon¹,

See²,

Magro

et al. 2008

Geofluids

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“…This is often the case in sedimentary basins (see e.g. Clauser et al (2002) for a literature review). However, fluid driven heat advection can be important also in crystalline rocks and on a crustal scale (e.g.…”

Section: Calculated Heat Capacitymentioning

confidence: 98%

“…This occurs in particular near mid-ocean ridges, where upwelling magma maintains large lateral temperature gradients in the highporosity sediments, but also in volcanic regions and many sedimentary basins on the continents where heat is redistributed by regional or focused groundwater flow (see e.g. Clauser et al (2002) for a literature review). Uyeda (1988) provides an additional appraisal to the data shown in Fig.…”

Section: The Thermal Regime Of the Earth's Crustmentioning

confidence: 99%

Heat Transport Processes in the Earth’s Crust

Clauser

2009

Surv Geophys

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The heat of the Earth derives from internal and external sources. A heat balance shows that most of the heat provided by external sources is re-emitted by long-wavelength heat radiation and that the dominant internal sources are original heat and heat generated by decay of unstable radioactive isotopes. Understanding of the thermal regime of the Earth requires appreciation of properties and mechanisms for heat generation, storage, and transport. Both experimental and indirect methods are available for inferring the corresponding rock properties. Heat conduction is the dominant transport process in the Earth's crust, except for settings where appreciable fluid flow provides a mechanism for heat advection. For most crustal and mantle rocks, heat radiation becomes significant only at temperatures above 1200°C.Keywords Heat transfer Á Thermal structure of the Earth Á Rock properties PrefaceThis article draws extensively on material published in a recent review on geothermal energy (Clauser 2006). Therefore, many of the figures derive from there, and the text provides a synopsis of the corresponding paragraphs. Additionally, an effort was made to keep this text as self-contained but also concise as possible by providing selected references within this text and by referring readers to the aforementioned review (Clauser 2006) for following up the others. This helps to keep the list of literature within the range of the other lectures' and does not imply any claim of original authorship for the facts, data or figures from these references. This article is based on material presented during the short course Process Modeling of Hydrothermal Systems held at RWTH

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“…This area is currently a focus of geothermal energy exploration. The deep origin of this geothermal anomaly is not completely known, however upper crustal fluid flow seems to be crucial (Clauser et al . 2002).…”

Section: Setting and Timo Experimentsmentioning

confidence: 99%

Teleseismic wave front anomalies at a Continental Rift: no mantle anomaly below the central Upper Rhine Graben

Kirschner¹,

Ritter²,

Wawerzinek³

2011

Geophysical Journal International

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S U M M A R YThe deep structure of the Upper Rhine Graben (URG), a continental rift in SW Germany and E France, is still poorly known. This deficit impedes a full understanding of the geodynamic evolution of this prominent rift. We study the lithosphere-asthenosphere structure using teleseismic waveforms obtained from the passive broad-band TIMO project across the central URG. The recovered, crust-corrected traveltime residuals relative to the iasp91 earth model are tiny (mostly less than 0.2-0.3 s). The average measured slowness (<1 s deg -1 ) and backazimuth (<5 • ) deviations are also very small and do not show any systematic wave front anomalies. These observed perturbation values are smaller than expected ones from synthetic 3-D ray tracing modelling with anomalies exceeding 2-3 per cent seismic velocity in the mantle. Thus there is no significant hint for any deep-seated anomaly such as a mantle cushion, etc. This result means that the rifting process did not leave behind a lower lithospheric signature, which could be clearly verified with high-resolution teleseismic experiments. The only significant traveltime perturbation at the central URG is located at its western side in the upper crust around a known geothermal anomaly. The upper crustal seismic anomaly with traveltime delays of 0.2-0.3 s cannot be explained with increased temperature alone. It is possibly related to a zone of highly altered granite. In the west of our network a traveltime anomaly (0.6-0.7 s delay) related with the Eifel plume is confirmed by the TIMO data set.

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Decoupled thermal and mantle helium anomalies: Implications for the transport regime in continental rift zones

Cited by 41 publications

References 80 publications

Noble gas and boron isotopic signatures of the Bacon‐Manito geothermal fluid, Philippines

Noble gas and boron isotopic signatures of the Bacon‐Manito geothermal fluid, Philippines

Heat Transport Processes in the Earth’s Crust

Teleseismic wave front anomalies at a Continental Rift: no mantle anomaly below the central Upper Rhine Graben

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