On the geothermal regime of the foreland of the Eastern Carpathians bend

Demetrescu, Camil; Wilhelm, H.; Ene, M.; Andreescu, M.; Polonic, Gabriela; Baumann, Christoph; Dobrică, Venera; Şerban, Delia Zemira

doi:10.1016/j.jog.2004.08.003

Cited by 8 publications

(8 citation statements)

References 37 publications

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Section: Resultsmentioning

confidence: 99%

“…It has been shown by Demetrescu et al (2005) that palaeoclimate changes of the surface temperatures are likely to produce significant effects on subsurface temperatures down to ∼2500 m in the study area and consequently on the surface heat flux inferred from measured data.…”

Section: Palaeoclimate Correctionmentioning

confidence: 98%

“…The former is discussed in the next subsection. The latter has been accepted by Demetrescu et al (2005) in the absence of thermal and/or independent evidence to play no significant role in this respect. As regards the mantle heat flux, the best fit has been obtained in case of a uniform value of 28 mW m −2 along the profile.…”

Section: The Mantle Heat Fluxmentioning

confidence: 99%

“… Borehole location in the study area. Tectonics after Dumitrescu & Săndulescu (1970).Triangles—HRT measurements (Demetrescu et al 2005); crosses—temperature measurements with discrete logging (Ene et al 1989–1990); thick line—study profile; labelled isolines—isobaths in meters at the base of Neogene–Quaternary formations; 1–41 identification numbers (Table 1). TF—Trotus fault; PCF —Peceneaga–Camena fault; COF—Capidava‐Ovidiu fault; IMF—Intra‐Moesian fault.…”

Section: Introductionmentioning

confidence: 99%

“…1). The investigated depth range of measurements was significantly larger than previously available, namely eight boreholes were investigated to maximum depths of 700–1000 m, 11 boreholes to 1000–1500 m, and five boreholes to 1900–2400 m. This data set was analysed in a previous study (Demetrescu et al 2005), which concluded that thermal conduction is the primary mechanism of heat transfer in the foreland of the Eastern Carpathian bend. The occurrence of basin‐scale fluid flow is not supported by thermal and/or independent evidence.…”

Section: Introductionmentioning

confidence: 99%

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Time-dependent thermal state of the lithosphere in the foreland of the Eastern Carpathians bend. Insights from new geothermal measurements and modelling results

Demetrescu¹,

Wilhelm²,

Tumanian³

et al. 2007

Geophysical Journal International

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S U M M A R YThe time-dependent heat budget, thermal evolution and rheology of the lithosphere in the last 13Myr, along a 120 km long profile in the foreland of the Eastern Carpathians bend is presented. The study area, a complex tectonic environment in the vicinity of the wellknown intermediate-depth seismogenic Vrancea zone, includes the deepest sedimentary basin in Romania (∼18 km), with a recent rapid evolution in the last 13Myr (8 km of sediments). Detailed high-resolution temperature logs in the depth ranges from 0-700 m to 0-2400 m in eight thermally stabilized boreholes, together with logging and geological information on structure, lithology and time evolution of the sedimentary pile have been used to model the thermal evolution by means of a 2-D finite element model which includes sedimentation history, sediment compaction, lateral and vertical variation of thermal properties of sediments and consolidated crust. Modelling results have been compared to measured temperatures, corrected for palaeoclimate effects, in a trial and error iterative approach.Sedimentation, palaeoclimate, undercompaction and heat refraction effects on one hand, and the heat generated in the upper crust, on the other, combine to explain the observed subsurface temperature field and in particular the pronounced curvature of the vertical temperature profiles.The Neogene-Quaternary sedimentation resulted in a rather uniform deficit of the surface heat flux of about 12 mW m −2 in the study area, in spite of the marked lateral variation of the sedimentary pile thickness. The palaeoclimate effect is responsible for a surface heat flux depression of 7-8 mW m −2 , uniform along the study profile. Unlike older sedimentary basins, in the study area transient sedimentation thermal effects add to palaeoclimate effects in establishing the temperature field in the depth range of geothermal measurements. The lateral variation of the palaeoclimatically corrected surface heat flux from the centre of the Focsani Depression (40 mW m −2 ) to its margin and the foreland platform (70 mW m −2 ) is mainly the result of the lateral variation of the heat produced in the upper crust where thickness varies from 7 to 21 km, respectively. A heat production of 2.3 µW m −3 for the southeastern end of the profile and of 2.15 µW m −3 for the rest of it has been modelled.As a result of the sedimentation process, temperature variations as large as 70-100 • C occurred in the pre-Neogene sediments and the crystalline crust immediately under the sedimentary pile, with consequences on the metamorphic state and rheological behaviour of the foreland

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Section: Resultsmentioning

confidence: 99%

Section: Palaeoclimate Correctionmentioning

confidence: 98%

Section: The Mantle Heat Fluxmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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