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| 2. |
- Parasnis, Dattatray
(författare)
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Mining geophysics
- 1973. - 2 rev.
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Bok (övrigt vetenskapligt/konstnärligt)
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| 3. |
- Parasnis, Dattatray S.
(författare)
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Effect of a uniform overburden on the passage of a thermal wave and the temperatures in the undelying rock
- 1976
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Ingår i: Geophysical Journal International. - 0956-540X .- 1365-246X. ; 46:1, s. 189-192
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Tidskriftsartikel (refereegranskat)abstract
- The system is a uniform overburden of thickness h, thermal The system considered k1, and diffusivity α1 overlying a semi‐infinite substratum (conductivity K2, diffusivity α2). It is shown that if the temperature of the surface varies with time t as T0 sin ωt, the temperatures v1, v2 in the overburden and the substratum respectively are given by: (Formula Presented.) The apparently simple boundary value problem has thus a surprisingly involved solution. The solution is of considerable importance in shallow geothermal measurements in, for example, moraine‐covered areas such as the Swedish Precambrian or in areas of uniform in situ weathering.
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| 4. |
- Parasnis, Dattatray
(författare)
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Temperature phenomena and heat flow estimates in two precambrian ore-bearing areas in north Sweden
- 1975
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Ingår i: Geophysical Journal International. - 0956-540X .- 1365-246X. ; 43:2, s. 531-554
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Tidskriftsartikel (refereegranskat)abstract
- Temperature measurements in 17 drillholes reaching vertical depths between 365 and 780 m below ground surface in the Skellefte area (lat. 65° 52deg;N, long. 20° 20° E Gr) and Aitik area (lat. 67° 5deg;N, long. 21° E Gr) in the Swedish precambrian are reported. The absolute accuracy of the measurements was about 0.03°C and the relative one about 0.005°C. A large number of thermal diffusivity measurements were made on rock samples from the two areas in order to estimate the correction to the observed steady geothermal gradients due to climatic amelioration at the end of the Pleistocene. The corrected gradients are between 0.01266°C m-1 and 0.01485°C m-1 (Skellefte) and between 0.01684°C m-1 and 0.02268°C m-1 (Aitik). The diffusivity measurements were supplemented by thermal conductivity determinations on 265 drillcore samples from the different rock formations in the holes.The undisturbed heat flow in the Skellefte area is found to be 48.7 mW m-2 and that in the Aitik area to be 49.8 mW m-2. Distortion of the heat flow due to a sulphide ore in the Skellefte area is demonstrated. The heat flow through the Långsele ore in this area is of the order of 70 mW m-2.
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