ALBERT

All Library Books, journals and Electronic Records Telegrafenberg

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
Filter
Collection
Keywords
Publisher
Language
Years
  • 1
    Electronic Resource
    Electronic Resource
    Palaeoclimate and structure: the most important factors controlling subsurface temperatures in crystalline rocks. A case history from Outokumpu, eastern Finland (1996)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical journal international 126 (1996), S. 0 
    Details
    ISSN: 1365-246X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: The present work contributes to the study of heat-transfer mechanisms in crystalline bedrock. We present evidence from a thoroughly investigated case history in Outokumpu, eastern Finland, in the Fennoscandian (or Baltic) Shield, which shows that the subsurface temperature field is controlled by the thermal conductivity structure and downward diffusion of palaeoclimatic ground-temperature variations. The subsurface temperature profiles from three continuously cored boreholes (790–1100m deep) were used for a detailed 2-D modelling of structural, hydrogeological and palaeoclimatic effects on the subsurface temperature field. The boreholes are situated in a subdued topography and they intersect Early Precambrian folded lithologies, such as mica gneisses, black schists, skarn rocks, quartzites and serpentinite-talc rocks. Finite-difference techniques were used in the numerical solution of the heat- and mass-transport equations. The 2-D models of thermal conductivity and hydraulic permeability that were compiled were based on an extensive set of data relating to geological structure, in situ hydraulic permeability, groundwater composition and thermal conductivity of drill-core samples down to about 1 km depth. It was found that the thermal effect of topographically driven groundwater convection is very small, with Peclet numbers typically of the order of 10−4−10−5. The effect of anisotropy of thermal conductivity was found to be one order of magnitude smaller than the effects of heat-flow refraction in the inclined rock layers which produce horizontal components of heat-flow density ranging from -15 to 5 mW m−2 (basal heat flow 35 mW m−2). Since the advective heat transfer could be neglected, we tried to find a palaeoclimatic ground-temperature history that would explain the measured data. First, an inversion algorithm based on heat conduction in laterally homogeneous media was used for the reconstruction of palaeoclimatic ground-temperature history, but it yielded spurious results because of the strong 2-D conductivity effects. The only means to reconstruct the past ground-temperature changes was forward modelling using a conductive transient 2-D model with time-dependent surface-temperature variations. The surface temperatures at different times (between 100 000 yr BP and the present) and the basal heat-flow density were varied in order to reach a reasonable fit between the modelled and measured borehole temperatures. To reach this goal, the ground-temperature history must include the main climatic events during the last 100 000 yr, such as the last glacial epoch and the Little Ice Age (from about 1300 AD to 1700 AD), followed by warmer temperatures in more recent times. Our results suggests that subsurface temperatures in conditions similar to those of the Outokumpu case can yield a wealth of palaeoclimatic information when an appropriate approach for modelling heat transfer in the bedrock is chosen.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-246X.1996.tb05270.x
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Palaeogeothermics in the Czechoslovak part of the Upper Silesian Basin (1991)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical journal international 104 (1991), S. 0 
    Details
    ISSN: 1365-246X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: The coalification data (vitrinite reflectance, percentage Rm) from 49 boreholes located in the Czechoslovak part of the Upper Silesian Basin were processed and the palaeotemperature gradient which prevailed during the Namurian and the Early Westphalian was estimated. Very high gradients (mean: 95 Km-1) are calculated at least in the western part of the basin during the Namurian A. At that time, the Ostrava Formation (FM) was deposited with a high subsidence rate. The corresponding heat flow density of 200 mW m-2 may not reflect the characteristic heat flow density of the region, but may represent a subsurface value within the uppermost 2–3 km thick layer, probably sustained by the convective system inside the basin. The gradient during the Namurian B, C and Westphalian A is lower (mean: 77 K km-1 in the Karviná FM). It is suggested that the decrease in the gradient coincides with changes in the basin development. An intra Namurian hiatus occurred at the turn of the Namurian A and B. The lower thermal regime which governed during the sedimentation of the Karviná FM, results also from the Rm data of the Ostrava FM at the southern rim and in the Karviná part of the basin (mean gradient 60–65 K km-1). Due to the relatively small thickness of the Ostrava FM and/or the big thickness of the Karviná FM in these areas, the sediments of the Ostrava FM reached the maximum temperature during the deposition of the Karviná FM. Thus, the Rm data must reflect the lower gradient. By applying palaeogradients estimated in both formations together with present mean thermal conductivities within them, a heat flow density of 115–130 mWm-2 was computed. This value agrees well with the heat flow of 125 mWm-2 estimated for the Westphalian A in the Ruhr Basin by the same method.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-246X.1991.tb05706.x
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Terrestrial heat flow in Cuba
    Amsterdam : Elsevier
    Physics of the Earth and Planetary Interiors 65 (1991), S. 207-209 
    Details
    ISSN: 0031-9201
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Geosciences , Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0031-9201(91)90128-5
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Temperature logs in deep wells—a useful tool for past climatic reconstruction (1993)
    Oxford, UK : Blackwell Publishing Ltd
    Terra nova 5 (1993), S. 0 
    Details
    ISSN: 1365-3121
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: According to the theory of heat conduction in a semi-infinite body, temperature changes at the surface propagate into the subsurface with the amplitude attenuation and time delay that increase with depth. Temperature changes on the earth's surface, reflecting the past climatic history, can thus be evaluated by analysing the curvature they have caused in the present temperature-depth distribution. As a rule, temperature profiles to depths of 200–300 m record surface temperature trends accurately over the last two centuries or so; deeper holes may reveal climate history farther back but with decreasing resolution.We present several synthetic temperature-depth profiles to demonstrate the expected signature of past surface temperature changes in the subsurface, the analysis of which may help better identify the climate of the past. Examples of extracted climate recollections from holes in North America and Europe are discussed. While inconspicuous underground records may correspond to the postglacial warming 8–11 kyr ago, reasonably well-documented borehole logging data have confirmed climate excursions in the past millenium, namely the Little Climate Optimum and the Little Ice Age. Traces of recent warming are generally common in many temperature records, evidencing the temperature rise by 1–2 K over the past 100 years.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-3121.1993.tb00238.x
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    The thermal field of the lithosphere in the region of mid-ocean ridges modelled on the basis of known surface temperature and heat flows (1984)
    Springer
    Studia geophysica et geodaetica 28 (1984), S. 407-417 
    Details
    ISSN: 1573-1626
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying , Geosciences , Physics
    Description / Table of Contents: Summary The possibility of solving the stationary heat equation with the convective term is demonstrated in the case that the velocity field of the continuum, and the temperature and heat flow on the Earth's surface are known, and that an assumption is made about the magnitude of heat flows on another part of the boundary of the two-dimensional region being investigated, whereas no boundary condition is imposed on the remainder of the region's boundary. The problem has been solved numerically for a kinematic model of the lithosphere in the region of mid-ocean ridges, based on the assumption of a broad deflected convective flow moving at a distance of more than about 150 km from the ridge modelled as a plate.
    Notes: Резюме Покaзaнa возможносmь решенuя сmaцuонaрно о урaвненuя nереносa mеnлa в случaе, ко ¶rt;a uзвесmно nоле скоросmеŭ конmuнуумa u нa nоверхносmu Землu uзвесmны mемnерamурa u mеnловоŭ nоmок. Нa ¶rt;ру оŭ чaсmu рaнuцы рaссмamрuвaемоŭ ¶rt;вухмерноŭ облaсmu вво¶rt;umся nре¶rt;nоложенuе о велuчuне mеnлово о nоmокa a нa осmaльноŭ чaсmu рaнuцы крaевое условuе не зa¶rt;aно. Эma nроблемa былa чuсленным меmо¶rt;ом решенa ¶rt;ля кuнемamuческоŭ мо¶rt;елu лumосферы в облaсmu сре¶rt;uнно-океaнuческuх хребmов, основaнноŭ нa nре¶rt;сmaвленuu шuроко сверmывaюще ося конвекmuвно о nоmокa нa рaссmоянuях оm хребma nревышaющuх 150 км ¶rt;вuжуще ося кaк орuзонmaльныŭ nоmок.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01642993
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    Temperature modelling along the Taratashskiy profile crossing the ural mountains (1992)
    Springer
    Studia geophysica et geodaetica 36 (1992), S. 349-357 
    Details
    ISSN: 1573-1626
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying , Geosciences , Physics
    Notes: Summary The temperature-depth distribution was calculated to a depth of 70 km along the 520 km long Taratashskiy refraction profile crossing the Ural Mts., approximately along latitude 56°N. The steady-state model was solved numerically using the finite-difference method, the vertical distribution of heat production was derived from the observed seismic velocities. It was shown that at the Moho boundary, the mantle heat flow varied between 10 and 25 mWm−2, and the Moho temperature amounted to 300–550°C for the two versions studied.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01625488
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 7
    Electronic Resource
    Electronic Resource
    Subsurface temperature measurements and terrestrial heat flow estimates in the Aswan region, Egypt (1995)
    Springer
    Studia geophysica et geodaetica 39 (1995), S. 162-176 
    Details
    ISSN: 1573-1626
    Keywords: borehole temperatures ; terrestrial heat flow
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying , Geosciences , Physics
    Notes: Summary The results of temperature measurements in six boreholes, drilled near the west shores of the Lake Nasser in the Aswan region in the Nubian Desert, are reported. Temperature-depth profiles, complemented by thermal conductivity determinations of surface rock samples, were used to calculate the existing range of heat flow density in the region as 40 ÷ 60 mWm−2, which is consistent with the values from the adjacent areas, reported in the literature. The extrapolated mean annual ground surface temperatures amount, on the average, to 30°C, which is 3 K higher than the mean annual air temperature in the region.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02296073
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 8
    Electronic Resource
    Electronic Resource
    The optimal shape design method applied to modelling thermal thinning of the oceanic lithosphere near hot spots (1986)
    Springer
    Studia geophysica et geodaetica 30 (1986), S. 356-375 
    Details
    ISSN: 1573-1626
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying , Geosciences , Physics
    Description / Table of Contents: Summary Using the optimal shape design method, which is generally described, and von Herzen's et al. measurements of the heat flow, the shape of the lithosphere and its thermal field is computed in the vertical plane parallel to the hot spot source versus the plate velocity at a distance of about 250 km from the axis of the Hawaiian Island chain. The results are compared with the computations based on Crough's idea of thermal rejuvenation of the oceanic lithosphere above a hot spot source. If we assume that the lateral cross-section of the lithospheric bottom is described by the Gaussian curve Δh=Δh0 exp (−y2/2σ2), we obtain Δh0≦35 km and σ≧130 km, where Δh is the value of lithospheric thinning and y the lateral coordinate. We thus obtain the lower limit of the lateral dimension of the Hawaiian anomaly.
    Notes: Резюме Прuменяя меmо¶rt; оnmuмaльного nоuскa облaсmu, коmорыŭ в общuх черmaх оnuсывaеmся, u ¶rt;aнные о mеnловом nоmоке, вычuсленa формa лumосферы u ее mеnловое nоле в верmuкaльноŭ nлоскосmu, naрaллельноŭ скоросmu лumосферы оmносumельно uсmочнuкaгорячеŭ mочкu u у¶rt;aленноŭ nрuблuзumельно 250 км оm лuнuuгaвaŭского aрхunелaгa. Резульmamы срaвнены с вычuсленuямu, основaннымu нa u¶rt;еu Крaфa (Crough), кaсaющuмuся mеnлового уmоненuя океaнuческоŭ лumосферы нa¶rt; uсmочнuкомгорячеŭ mочкu. Еслu nре¶rt;nоложumь, чmо лamерaльное nоnеречное сеченuе лumосферuческого ¶rt;нa оnuсывaеmся крuвоŭ Гaуссa Δh=Δh0 exp (−y2/2σ2), mо nолучumся Δh0 ≦35 кмuσ ≧130 км,г¶rt;е Δh—лumосферuческое уmоненuе u у—лamерaльнaя коор¶rt;uнama. Сле¶rt;овamельно, σ=130 км являеmся нuжным nре¶rt;елом лamерaльного рaзмерaгaвaŭскоŭ aномaлuu.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01646380
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 9
    Electronic Resource
    Electronic Resource
    Regularization of downward heat flow continuation (1987)
    Springer
    Studia geophysica et geodaetica 31 (1987), S. 359-368 
    Details
    ISSN: 1573-1626
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying , Geosciences , Physics
    Description / Table of Contents: Summary Some regularization approaches to downward heat flow continuation from the Earth's surface to the depth of interest are presented, provided the heat transfer is described by the homogeneous steady-state equation. The Fourier transform of horizontal coordinates is used and the relation between the regularization of the heat flow spectrum and the regularization of the heat flow in the spatial domain are discussed. The utilization of an a priori information about the subsurface heat flow is mentioned.
    Notes: Резюме Пре¶rt;ложены некоmорые реzулярuзaцuонные nо¶rt;хо¶rt;ы к nро¶rt;олженuю внuз nоверхносmноzо mеnловоzо nоmокa в nре¶rt;nоложенuu, чmо nеренос mеnлa оnuсывaеmся о¶rt;норо¶rt;ным сmaцuонaрным урaвненuем (урaвненuем Лanлaсa). Исnользовaно nреобрaзовaнuе Фурье zорuзонmaльных коор¶rt;uнam u рaссмоmренa связь меж¶rt;у реzулярuзaцuеŭ mеnловоzо nоmокa u рерулярuзaцuеŭ еzо сnекmрa. Уnомянуma возможносmь nрuмененuя aнnрuорноŭ оценкu nо¶rt;nоверхносmноzо mеnловоzо nоmокa.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01882607
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 10
    Electronic Resource
    Electronic Resource
    Temperature paleogradient estimations in the central Bohemian basin (1990)
    Springer
    Studia geophysica et geodaetica 34 (1990), S. 208-219 
    Details
    ISSN: 1573-1626
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying , Geosciences , Physics
    Notes: Summary The coalification data of 12 boreholes in the Central Bohemian Basin are used to evaluate the paleotemperature gradients for the Upper Carboniferous period of the basin's development. Two versions of the burial history considered are supposed to yield an upper and a lower estimate. According to the more probable “lower” version, the average values of the paleogradient suggest an increasing tendency from west to east in the interval of 45–53K/km. The current geothermal gradients vary in the range of 28–35K/km. By combining the present thermal conductivity and the paleogradients, we have tried to estimate the Upper Carboniferous heat flow. Its values range from 96mW/m 2 to 117mW/m 2 . The results obtained can be compared with the paleogradient estimates in the Saar-Nahe Basin (F. R. of Germany). This region, which is similar with respect to the time of origin and tectonic pattern to the Central Bohemian Basin, displays on the average a slightly higher Permo-Carboniferous geothermal gradient of 60K/km.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02295927
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...