Abnormal heat flow and the trough’s nature in the Northern Svalbard plate

Хуторской, М. Д.; Leonov, Yu. G.; Ermakov, A. N.; Akhmedzyanov, V. R.

doi:10.1134/s1028334x09010073

Cited by 25 publications

(9 citation statements)

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“…The heatflow rate in the region is considerably larger than what is commonly found in northern Europe (Khutorskoi et al 2009;Slagstad et al 2009). Cenozoic crustal uplift (Vå gnes & Amundsen 1993), and more recently 80 mW/m 2 is reported as a steady borehole heat-flow rate in the Sysselmannbreen area ( Fig.…”

mentioning

confidence: 81%

The first magnetotelluric image of the lithospheric-scale geological architecture in central Svalbard, Arctic Norway

et al. 2015

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mentioning

confidence: 81%

The first magnetotelluric image of the lithospheric-scale geological architecture in central Svalbard, Arctic Norway

et al. 2015

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“…MT results local to the largest population centre Longyearbyen identified a conductivity structure which is suggested as favourable for geothermal heat storage with a zone of high conductivity in the mid-crust 'sealed' by overlying and surrounding resistive bodies . Elevated heat flow rates ranging from 80 to 130 mW m −2 have been reported for the area (Vagnes and Amundsen 1993;Khutorskoi et al 2009;Slagstad et al 2009;Pascal et al 2011) due to local deep faulting, and a thinned (~ 100 km) lithosphere (Bergh and Grogan 2003) combined with the local conductivity structure makes further evaluation of the areas geothermal resource potential warranted. Further a near-surface resistive layer extending to a depth of ~ 120 m represents the permafrost zone of primarily unconsolidated gravels ; however, there is significant heterogeneity in the thickness of the permafrost layer with a max depth of ~ 250 m and a general thinning westward (towards the coast).…”

Section: Svalbard Archipelago Norwaymentioning

confidence: 99%

On the Use of Electromagnetics for Earth Imaging of the Polar Regions

Hill

2019

Surv Geophys

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The polar regions are host to fundamental unresolved challenges in Earth studies. The nature of these regions necessitates the use of geophysics to address these issues, with electromagnetic and, in particular, magnetotelluric studies finding favour and being applied over a number of different scales. The unique geography and climatic conditions of the polar regions means collecting magnetotelluric data at high latitudes, which presents challenges not typically encountered and may result in significant measurement errors. (1) The very high contact resistance between electrodes and the surficial snow and ice cover (commonly MΩ) can interfere with the electric field measurement. This is overcome by using custom-designed amplifiers placed at the active electrodes to buffer their high impedance contacts.(2) The proximity to the geomagnetic poles requires verification of the fundamental assumption in magnetotellurics that the magnetic source field is a vertically propagating, horizontally polarised plane wave. Behaviour of the polar electro-jet must be assessed to identify increased activity (high energy periods) that create strong current systems and may generate non-planar contributions. (3) The generation of 'blizstatic', localised random electric fields caused by the spin drift of moving charged snow and ice particles that produce significant noise in the electric fields during periods of strong winds. At wind speeds above ~ 10 m s −1 , the effect of the distortion created by the moving snow is broad-band. Station occupation times need to be of sufficient length to ensure data are collected when wind speed is low. (4) Working on glaciated terrain introduces additional safety challenges, e.g., weather, crevasse hazards, etc. Inclusion of a mountaineer in the team, both during the site location planning and onsite operations, allows these hazards to be properly managed. Examples spanning studies covering development and application of novel electromagnetic approaches for the polar regions as well as results from studies addressing a variety of differing geologic questions are presented. Electromagnetic studies focusing on near-surface hydrologic systems, glacial and ice sheet dynamics, as well as large-scale volcanic and tectonic problems are discussed providing an overview of the use of electromagnetic methods to investigate fundamental questions in solid earth studies that have both been completed and are currently ongoing in polar regions.

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“…По данным геолого-геофизических исследований в 25-м рейсе НИС "Академик Николай Страхов" (сентябрь 2007 г. ), для трога Орла характерны сложные топография и строение акустического фундамента, а кроме того, аномально высокие значения плотности донного теплового потока (далее ТП), что в совокупности указывает на неотектонические процессы в данном районе [1,7]. Результаты геотермических работ 27-го рейса НИС "Академик Николай Страхов" (сентябрь 2010 г.)…”

Section: морская геологияunclassified

“…Для района I, очевидно, в сентябре, во время геотермических измерений в придонном горизонте еще наблюдалось окончание "холодного" периода, которое над континентальным склоном регистрировалось станцией М4 в конце июня. Благодаря достаточно длительному относительно холодному, термически стабильному периоду, пришедшему на смену длительному относительно теплому в результате резкого похолодания, в осадках успело сформироваться квазилинейное распределение температур, ошибочно принятое исследователями за термическое распределение под воздействием эндогенного ТП [7].…”

Section: результаты моделированияunclassified

Influence of temperature variability in the near-bottom layer on the results of geothermal measurements in the Kvitøya trough (Barents sea)

2019

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According to a study of the water column thermal variability in the Kvitøya trough (the northern part of the Barents Sea) substantial water temperature fluctuations in the near-bottom layer were found, both the seasonal and interannual, which affect the distribution of temperature in the upper layer of bottom sediments, and therefore the results of geothermal measurements. The contribution of temperature fluctuations on the water-sediments boundary to the values of the conductive heat flow measured during 25th cruise of the RV “Akademik Nikolaj Strakhov” was calculated. Endogenous heat flow was determined.

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Abnormal heat flow and the trough’s nature in the Northern Svalbard plate

Cited by 25 publications

References 1 publication

The first magnetotelluric image of the lithospheric-scale geological architecture in central Svalbard, Arctic Norway

The first magnetotelluric image of the lithospheric-scale geological architecture in central Svalbard, Arctic Norway

On the Use of Electromagnetics for Earth Imaging of the Polar Regions

Influence of temperature variability in the near-bottom layer on the results of geothermal measurements in the Kvitøya trough (Barents sea)

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