The variation of heat generation, density and seismic velocity with rock type in the continental lithosphere

Rybach, Ladislaus; Buntebarth, Günter

doi:10.1016/0040-1951(84)90095-7

Cited by 160 publications

(32 citation statements)

References 10 publications

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“…The existence of low-velocity layers in the crust has been reported by several authors, e.g., Rybach et al (1977) in the Alps. However, the mechanical application of the Rybach and Buntebarth (1984) formulae in the lower-velocity zones beneath the Atlas system may give an abnormally high crustal heat production and an unrealistic mantle heat flow less than 15 mWm -2 for a region inheriting a Mesozoic rifting effect and a Neogene basaltic volcanism (Middle Atlas). It is noteworthy that deep geomagnetic soundings show a decrease of the electrical resistivity at these lowvelocity levels (Schwarz et al 1992).…”

Section: Mantle Heat Flowmentioning

confidence: 98%

“…The experimental relation between P-wave velocity (V P ) and radiogenic heat production (A), proposed by Rybach and Buntebarth (1984), allows for the conversion of a seismic velocity profile into a heat production profile. The nature of this empirical relationship, between seismic velocity (being the physical parameter) and heat production (being the chemical parameter) is still a matter of discussion.…”

Section: Mantle Heat Flowmentioning

confidence: 99%

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Mantle heat flow and geotherms for the main geologic domains in Morocco

Rimi¹

1999

International Journal of Earth Sciences

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Thermal and deep seismic soundings data are used to study the dependence between the compressional P n velocity and the surface heat flow or the temperature at the Moho discontinuity in Morocco. This correlation indicates a significant decrease in P n velocity where high heat flow and Moho temperature are observed. This result is consistent with respect to other regions of the world. Crustal heat generation models and geotherms are constructed for the major Moroccan geological domains extending from the Precambrian units in the south to the Alpine units in the north. The crustal contribution in surface heat flow is on average 35 mWm -2 , with high values of 41-42 mWm -2 in the western and eastern Meseta where Hercynian granite intrusions could enrich the crust in radioactive heat sources. High mantle heat flow values are obtained beneath the Alboran neogene basin (62 mWm -2 ), the Rif (47 mWm -2 ), the Middle Atlas (41 mWm -2 ), and the south Atlantic margin (40 mWm -2 ) where the crust is thinned by an extensional tectonic regime. Despite their similar formation context, the intra-continental belts of the Middle and the High Atlas show different geothermal field components. A lithospheric heating process in the Middle Atlas could be the result of a Plio-Quaternary basaltic volcanism. Finally, the Precambrian basement of the Anti-Atlas like all the West African shield is a stable domain showing the lowest subsurface temperatures.

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Section: Mantle Heat Flowmentioning

confidence: 98%

Section: Mantle Heat Flowmentioning

confidence: 99%

Mantle heat flow and geotherms for the main geologic domains in Morocco

Rimi¹

1999

International Journal of Earth Sciences

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“…With the precise knowledge of P -wave velocity distribution available from the DSS studies the distribution of heat generation A, in the middle and lower crustal layer is estimated from P -wave velocity value by using the following empirical relationship between P -wave seismic velocity (V p ) and radiogenic heat generation (A) for Precambrian rocks (Rybach and Buntebarth 1984;Cermak 1989):…”

Section: Mathematical Modelingmentioning

confidence: 99%

2-D Crustal thermal structure along Thuadara-Sindad DSS profile across Narmada-Son lineament, central India

Thiagarajan

2007

J Earth Syst Sci

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Central India is traversed by a WSW-ENE trending Narmada-Son lineament (NSL) which is characterized by the presence of numerous hot springs, feeder dykes for Deccan Traps and seismicity all along its length. It is divided in two parts by the Barwani-Sukta Fault (BSF). To the west of this fault a graben exists, whereas to the east the basement is uplifted between Narmada North Fault (NNF) and Narmada South Fault (NSF). The present work deals with the 2-D thermal modeling to delineate the crustal thermal structure of the western part of NSL region along the Thuadara-Sindad Deep Seismic Sounding (DSS) profile which runs almost in the N-S direction across the NSL. Numerical results of the model reveal that the conductive surface heat flow value in the region under consideration varies between 45 and 47 mW/m 2 . Out of which 23 mW/m 2 is the contribution from the mantle heat flow and the remaining from within the crust. The Curie depth is found to vary between 46 and 47 km and is in close agreement with the earlier reported Curie depth estimated from the analysis of MAGSAT data. The Moho temperature varies between 470 and 500 • C. This study suggests that this western part of central Indian region is characterized by low mantle heat flow which in turn makes the lower crust brittle and amenable to the occurrence of deep focused earthquakes such as Satpura (1938) earthquake.

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“…Exponential model [40] (z 0 -thickness of upper, A l -heat generation rate of middle crust) Middle A=constant lnA = 12.6 − 2.17vp vp-P wave velocity [41] Lower A=constant of the basin. The calculations (Fig.…”

Section: Thermal Structure Of Lithospherementioning

confidence: 99%

Characteristics of Heat Flow and Lithospheric Thermal Structure in the Junggar Basin, Northwestern China

Rao

Zhu

et al. 2013

Chinese J of Geophysics

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Characteristics of present-day heat flow and thermal structure of lithosphere in basins are essential constraints to reveal the tectonic-thermal evolution process and to reconstruct thermal history of the basins, which are of great significance for research of basin dynamics and evaluation of petroleum resources. This work is based on 11 newly measured high-quality heat flow values from well-log temperature data in 102 boreholes, oil-test temperature data in over 400 new boreholes, and thermal conductivity data of 187 samples from 15 wells measured by optical scanning in the Junggar basin. Our purpose is to analyze features of heat flow and reveal thermal structure of lithosphere in this basin. The results show current geotemperature gradients between 11.6∼27.6 • C/km, 21.3±3.7• C/km on average; and surface heat flow between 23.4∼56.1 mW/m 2 ; 42.5±7.41 mW/m 2 on average; which imply a cold basin with low geotemperature gradients and low heat flow. These values in the Junggar basin are distributed in largely consistent patterns, primarily controlled by the structural shape of the basement. They are the highest at the uplift in the east, next at the Luliang uplift, relatively low in the Wulungu depression, central depression, and the uplift in the west, and lowest in the range-front depression of the North TianShan. Beneath the Junggar basin, the crustal heat flow is 18.8∼26.0 mW/m 2 , mantle heat flow 16.5∼23.7 mW/m 2 , the ratio of the former to the latter is 0.79∼1.58, indicative of a thermal structure of cold crust and cold mantle. The distribution of mantle heat flow values accords with topography of the Moho interface, which are high below uplifts and low beneath depressions in the basin.

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The variation of heat generation, density and seismic velocity with rock type in the continental lithosphere

Cited by 160 publications

References 10 publications

Mantle heat flow and geotherms for the main geologic domains in Morocco

Mantle heat flow and geotherms for the main geologic domains in Morocco

2-D Crustal thermal structure along Thuadara-Sindad DSS profile across Narmada-Son lineament, central India

Characteristics of Heat Flow and Lithospheric Thermal Structure in the Junggar Basin, Northwestern China

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