A heat generation model for continental crust based on deep drilling in the Baltic Shield

Kremenetsky, A. A.; Milanovsky, S. Yu.; Ovchinnikov, L. N.

doi:10.1016/0040-1951(89)90130-3

Cited by 41 publications

(14 citation statements)

References 10 publications

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“…Similar to investigations in other metamorphic regions [e.g., Kremenetsky et al, 1989: Ashwal et al, 1987, the heat production profile to 9.1 km depth at KTB vitiates any hope finding simple, general and systematic models for the vertical distribution of A(z) in the upper crystalline continental crust. Less is known about the middle and lower crust except the fact that, in general, A(z) has to decrease with depth.…”

Section: Discussionsupporting

confidence: 78%

Radiogenic heat production in the upper third of continental crust from KTB

Pribnow

Winter²

1997

Geophysical Research Letters

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The heat production rate of continental crystalline rocks was determined from cores and drill cuttings recovered from depths up to 9.1 km in boreholes drilled by the Continental Deep Drilling Program of Germany (KTB). The drilled rocks are mainly gneisses and metabasites. Based on a large amount of data, the comparison of laboratory and in situ determinations by logging shows good agreement. The loss of radioactive elements in drill cutting samples at the shaker tables was minimized by using a broad range of available fragment sizes. The data reveal a clear lithological dependence of the heat production rate of the metamorphic rocks at KTB. The lithologically caused variations of the heat production rate have a wavelength in the order of the drilled depth and therefore, they cover up any decreasing trend if there is one. Below 6 km, tectonic elements such as fault zones play also an important role in the observed vertical distribution. Despite the availability of data for the upper third of the crust, models to predict temperatures for greater depths still contain uncertainties.

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Section: Discussionsupporting

confidence: 78%

Radiogenic heat production in the upper third of continental crust from KTB

Pribnow

Winter²

1997

Geophysical Research Letters

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“…Xenoliths lead to a global average heat production of 0.28 mW m À3 (Rudnick and Fountain, 1995), while exposed rocks from lower crustal levels yield 0.4-0.5 mW m À3 (Figure 14). At Kola, Baltic Shield, Russia, the Proterozoic supracrustal rocks (above 4 km) have much lower heat production (0.4 mW m À3 ) than the Archean basement (1.47 mW m À3 ) (Kremenentsky et al, 1989). Studies of exposed crustal sections suggest a general trend of decreasing heat production with depth, but this trend is not a monotonic function (Ashwal et al, 1987;Fountain et al, 1987;Ketcham, 1996).…”

Section: Crustal Heat Productionmentioning

confidence: 97%

Heat Flow and Thermal Structure of the Lithosphere

Jaupart

Mareschal²

2015

Treatise on Geophysics

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“…Other models use an empirical correlation between seismic velocity and radiogenic heat production (Rybach and Buntebarth 1982). Direct measurements on exposed cross sections (Ashwal et al Fountain et al 1987) and in deep boreholes (Kremenetsky et al 1989) indicate the primary role of lithology and do not favour one of the aforementioned models. We have used a variation of the exponential model, where heat generation decreases exponentially in the upper -10 km of the crust and has relatively uniform values in the lower crust and upper mantle.…”

Section: Lmentioning

confidence: 98%

Density, temperature, and rheological models for the southeastern Canadian Cordillera: implications for its geodynamic evolution

Lowe¹,

Ranalli²

1993

Can. J. Earth Sci.

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Two-dimensional density, temperature, and rheological models are constructed for a 350 km northeast-trending transect of the southeastern Canadian Cordillera. All models highlight several major physical differences between foreland and hinterland lithosphere. Significant features of the density model are the presence of an anomalously low-density (3.10 x lo3 kg . m-3) layer, with a maximum thickness of 12 km, beneath the Moho in the hinterland; the similar densities of the Monashee Terrane and the cratonic crust of the foreland; and an increase in crustal thickness beneath the Southern Rocky Mountain Trench. The temperature model shows steeper gradients and higher Moho temperatures beneath the hinterland than beneath the foreland. In the rheological model the hinterland is characterized by a thin, brittle, upper crust beneath which the entire lithosphere is hot, weak, and ductile. In contrast, the foreland is composed of a thick, brittle, upper crust, with an additional brittle zone in the upper mantle. The Moho is a large strength discontinuity beneath the foreland, and the total lithospheric strength there is an order of magnitude larger than in the hinterland. The models are constrained and supported by geological mapping and a number of independent geophysical data sets. Palinspastic cross sections, together with paleotemperature and paleopressure information, are used to generate a time series of one-dimensional paleorheological profiles at a number of times during deformation. This sequence of profiles indicates that the foreland and hinterland have been rheologically distinct since pre-Late Cretaceous times. The profiles are used to clarify the geodynamic evolution of the area and to explain why deformation remained thin skinned in the foreland whereas in the hinterland the entire lithosphere was deformed.Des modbles bidimensionnels de densitk, des temptratures et de comportement rhCologique sont tlaborts pour un transect de 350 km, orient6 nord-est, dans le sud-est de la Cordillbre du Canada. Tous les modkles font ressortir plusieurs diffkrences physiques majeures entre la lithosphkre de l'avant-pays et de l'arrikre-pays. Les principales caractkristiques du modkle de densitk sont la presence d'une couche de densite anormalement faible (3,10 X lo3 kg . m-3), avec une Cpaisseur maximale de 12 krn, sous le Moho dans l'arrikre-pays; les densites analogues pour le terrane de Monashee et la crodte cratonique de l'avant-pays; et l'accroissement de l'epaisseur crustale sous le sillon mtridional des Rocheuses. Le modkle des temptratures montre des gradients plus abrupts et des temptratures plus tlevees pour le Moho sous l'arrikre-pays que sous l'avant-pays. Dans le modkle rhtologique, l'arribre-pays est caracterist par une croQte suptrieure mince et cassante, sous laquelle la lithosphkre entikre est chaude, faible et ductile. L'avant-pays est, au contraire, form6 d'une crodte suptrieure Bpaisse, cassante, avec une zone supplementaire cassante dans le manteau suptrieur. Le Moho reprCsente une grande discontinuit6 d...

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A heat generation model for continental crust based on deep drilling in the Baltic Shield

Cited by 41 publications

References 10 publications

Radiogenic heat production in the upper third of continental crust from KTB

Radiogenic heat production in the upper third of continental crust from KTB

Heat Flow and Thermal Structure of the Lithosphere

Density, temperature, and rheological models for the southeastern Canadian Cordillera: implications for its geodynamic evolution

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