Terrestrial heat flow on Pre-Cambrian shields in the USSR

Lubimova, E. A.; Karus, E. V.; Firsov, F.V; Starikova, G.N; Vlasov, V.K; Lyusova, L.N; Koperbakh, E.B

doi:10.1016/0375-6505(72)90017-x

Cited by 14 publications

(2 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The mantle heat flow levels in the NB are also higher compared to estimates from other granulite provinces of the Canadian shield and Norway region of the Baltic shield [see, Pinet et al , 1991; Smithson and Ramberg , 1979; Mareschal et al , 2000] (Table 7). A comparable high mantle heat flow of 25–31 mW m −2 has however been reported only from the Kola peninsula of the Baltic shield [ Lubimova et al , 1972; Arshavskaya et al , 1972]. …”

Section: Discussionmentioning

confidence: 85%

High mantle heat flow in a Precambrian granulite province: Evidence from southern India

et al. 2003

View full text Add to dashboard Cite

[1] Twelve new heat flow values determined at nine sites and heat production estimated from radioelemental measurements at 330 sites in the southern granulite province (SGP) bring out contrasting crustal and subcrustal thermal characteristics between the SGP and the adjacent Archaean Dharwar greenstone-granite-gneiss province (DP) in south India. A twolayer granulitic crust of Late Archaean charnockites and gneisses characterizes the northern block (NB), north of the Palghat-Cauvery lineament (PCL). The heat production of the upper, 7-10 km thick, metasomatized granulitic layer ranges between 0.2 and 0.75 mW m À3 (mean 0.5 ± 0.3 (SD) mW m À3 ). This layer overlies radioelement-depleted granulites characterized by very low heat production ranging from 0.14 to 0.2 mW m À3 (mean 0.16 ± 0.07(SD) mW m À3). In a large sector of the NB, erosion of the upper metasomatized granulite layer has laid bare the depleted granulitic rocks, which represent one of the lowest heat-producing crustal sections. The mean heat flow in the NB is 36 ± 4 mW m À2 (N = 10). The southern block (SB), south of PCL, in contrast to the NB, comprises complexly interlayered charnockites, gneisses, granites, khondalites, and leptynites, which have variable and much higher levels of heat production ranging between 1.11 and 2.63 mW m À3 . The heat flow in the SB is 47 ± 8 mW m À2 (N = 3). Overall, the range of heat flow values in the SGP is within the range for the DP. Mantle heat flow in the NB, both from the lowest heat-producing sector and other areas, is deduced in the light of heat production and heat flow data, at 23-32 mW m À2 , whose values are distinctly higher than 11-16 mW m À2for the adjacent DP. The higher mantle heat flow in the NB appears to be a consequence of higher heat production in the subjacent mantle.

show abstract

Section: Discussionmentioning

confidence: 85%

High mantle heat flow in a Precambrian granulite province: Evidence from southern India

et al. 2003

View full text Add to dashboard Cite

show abstract

“…Näslund et al, 2005;Rogozhina et al, 2012). For palaeo-ice sheets where geothermal heat flow is relatively (Lubimova et al, 1972;Kukkonen, 1989;Rolandone et al, 2003). The increased sensitivity of the ice sheet to thermal conditions at the ice-bed interface partly explains the resulting unstable dynamics, or ice-stream purges, that have been inferred for these sectors during deglaciation under a rapidly changing climate (e.g.…”

Section: Geothermal Forcingmentioning

confidence: 99%

The configuration, sensitivity and rapid retreat of the Late Weichselian Icelandic ice sheet

Patton

Hubbard

Bradwell

et al. 2017

Earth-Science Reviews

View full text Add to dashboard Cite

The fragmentary glacial-geological record across the Icelandic continental shelf has hampered reconstruction of the volume, extent and chronology of the Late Weichselian ice sheet particularly in key offshore zones. Marine geophysical data collected over the last two decades reveal that the ice sheet likely attained a continental shelf-break position in all sectors during the Last Glacial Maximum, though its precise timing and configuration remains largely unknown. Within this context, we review the available empirical evidence and use a well-constrained three-dimensional thermomechanical model to investigate the drivers of an extensive Late Weichselian Icelandic ice-sheet, its sensitivity to environmental forcing, and phases of deglaciation. Our reconstruction attains the continental shelf break across all sectors with a total ice volume of 5.96×10 5km3 with high precipitation rates being critical to forcing extensive ice sheet flow offshore. Due to its location astride an active mantle plume, a relatively fast and dynamic ice sheet with a low aspect ratio is maintained. Our results reveal that once initial ice-sheet retreat was triggered through climate warming at 21.8 ka BP, marine deglaciation was rapid and accomplished in all sectors within c. 5 ka at a mean rate of 71 Gt of mass loss per year. This rate of ice wastage is comparable to contemporary rates observed for the West Antarctic ice sheet. The ice sheet subsequently stabilised on shallow pinning points across the near shelf for two millennia, but abrupt atmospheric warming during the Bølling Interstadial forced a second, dramatic collapse of the ice sheet onshore with a net wastage of 221 Gt a−1 over 750 years, analogous to contemporary Greenland rates of mass loss. Geothermal conditions impart a significant control on the ice sheet's transient response, particularly during phases of rapid retreat. Insights from this study suggests that large sectors of contemporary ice sheets overlying geothermally active regions, such as Siple Coast, Antarctica, and NE Greenland, have the potential to experience rapid phases of mass loss and deglaciation once initial retreat is initiated

show abstract

Table 7 (igneous - metamorphic rocks)

Čermák¹,

Rybach²

Landolt-Börnstein - Group v Geophysics

View full text Add to dashboard Cite

Terrestrial heat flow on Pre-Cambrian shields in the USSR

Cited by 14 publications

References 5 publications

High mantle heat flow in a Precambrian granulite province: Evidence from southern India

High mantle heat flow in a Precambrian granulite province: Evidence from southern India

The configuration, sensitivity and rapid retreat of the Late Weichselian Icelandic ice sheet

Table 7 (igneous - metamorphic rocks)

Contact Info

Product

Resources

About