Deep electrical conductivity of East Siberia and the Far East of Russia

Moroz, Yu. F.; Pospeev, A.V.

doi:10.1016/0040-1951(94)00143-w

Cited by 5 publications

(2 citation statements)

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“…Correlation between surface heat flow and depth to the high-conductive layer in the mantle (electric asthenosphere). Depth to HCL is based on interpretations of Adam (1976), Adam and Wesztergom (2001), Bahr (1985), Berdichevsky et al (1980), ERCEUGT-Group (1992), Jones et al (2003), Korja (1993), Kurtz et al (1993), Mareschal et al (1995), Moroz and Pospeev (1985), Safonov et al (1976), Schultz et al (1993), Simpson (2002), Singh et al (1995), Vanyan and Cox (1983), Zhdanov et al (1986). The curve can be used as a proxy to the depth of the HCL for regions with a known heat flow.…”

Section: Constraints On Continental Geotherms From Electrical Conductmentioning

confidence: 99%

Global 1°×1° thermal model TC1 for the continental lithosphere: Implications for lithosphere secular evolution

2006

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This paper reports a new 1°× 1°global thermal model for the continental lithosphere (TC1). Geotherms for continental terranes of different ages (N 3.6 Ga to present) constrained by reliable data on borehole heat flow measurements (Artemieva, I.M., Mooney, W.D. 2001. Thermal structure and evolution of Precambrian lithosphere: a global study. J. Geophys. Res 106, 16387-16414.), are statistically analyzed as a function of age and are used to estimate lithospheric temperatures in continental regions with no or lowquality heat flow data (ca. 60% of the continents). These data are supplemented by cratonic geotherms based on electromagnetic and xenolith data; the latter indicate the existence of Archean cratons with two characteristic thicknesses, ca. 200 and N 250 km. A map of tectono-thermal ages of lithospheric terranes complied for the continents on a 1°× 1°grid and combined with the statistical age relationship of continental geotherms (z = 0.04 ⁎ t + 93.6, where z is lithospheric thermal thickness in km and t is age in Ma) formed the basis for a new global thermal model of the continental lithosphere (TC1). The TC1 model is presented by a set of maps, which show significant thermal heterogeneity within continental upper mantle, with the strongest lateral temperature variations (as large as 800°C) in the shallow mantle. A map of the depth to a 550°C isotherm (Curie isotherm for magnetite) in continental upper mantle is presented as a proxy to the thickness of the magnetic crust; the same map provides a rough estimate of elastic thickness of old (N 200 Ma) continental lithosphere, in which flexural rigidity is dominated by olivine rheology of the mantle. Statistical analysis of continental geotherms reveals that thick (N 250 km) lithosphere is restricted solely to young Archean terranes (3.0-2.6 Ga), while in old Archean cratons (3.6-3.0 Ga) lithospheric roots do not extend deeper than 200-220 km. It is proposed that the former were formed by tectonic stacking and underplating during paleocollision of continental nuclei; it is likely that such exceptionally thick lithospheric roots have a limited lateral extent and are restricted to paleoterrane boundaries. This conclusion is supported by an analysis of the growth rate of the lithosphere since the Archean, which does not reveal a peak in lithospheric volume at 2.7-2.6 Ga as expected from growth curves for juvenile crust. A pronounced peak in the rate of lithospheric growth (10-18 km 3 /year) at 2.1-1.7 Ga (as compared to 5-8 km 3 /year in the Archean) well correlates with a peak in the growth of juvenile crust and with a consequent global extraction of massif-type anorthosites. It is proposed that large-scale variations in lithospheric thickness at cratonic margins and at paleoterrane boundaries controlled anorogenic magmatism. In particular, mid-Proterozoic anorogenic magmatism at the cratonic margins was caused by edge-driven convection triggered by a fast growth of the lithospheric mantle at 2.1-1.7 Ga. Belts of anorogenic magmatism within cratonic interiors can ...

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Section: Constraints On Continental Geotherms From Electrical Conductmentioning

confidence: 99%

Global 1°×1° thermal model TC1 for the continental lithosphere: Implications for lithosphere secular evolution

2006

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“…Возможно, именно здесь происходит изменение 1 -faults mapped on the surface; 2 -main tectonic structures: АЮА -Ayan-Yuryakh anticlinorium, ИДС -Inyali-Debinsky synclinorium, БП -Balygychan uplift, СС -Sugoi synclinorium. The geological features of the classes are given in Table 1 реологических свойств геологической среды и земная кора делится на верхнюю хрупкую зону и подстилающую ее нижнюю, насыщенную флюидами, пластичную зону [Pospeev, 1987[Pospeev, , 2004Shilovsky, 1994;Marquis, Hyndman, 1992;Moroz, Pospeev, 1995]. Выявленные высокоомные аномалии чередуются с зонами электропроводности, содержащими примесные ионные и электронные проводники [Pospeev, 2004], которые отображают ряд разломов верхнекорового и глубинного (сквозькорового) заложения.…”

Section: обсуждение результатовunclassified

Structural Features of the Deep Structure of the Southeastern Yana-Kolyma Fold System From Complex Geophysical Data

Gaidai¹,

Горячев

Khasanov

et al. 2020

Geodin. tektonofiz.

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Ore deposits of the Magadan region are now in the focus of comprehensive studies as information on their deep structure is needed for both subsoil prospecting and regional development planning. This article presents the research results for the southeastern flank of the Yana-Kolyma orogenic belt. This area located at the junction with the Okhotsk-Koryak orogenic belt was investigated using the northeastern segment of the regional geophysical profile 3-DV. We analyzed the frequency-energy sections of the crust along the profile, 3D crustal density model of the entire study area, and magnetic, geoelectric and gravimagnetic characteristics of the crust. Complex data interpretation allowed tracing the crustal fault zones, areas wherein the crust material was strongly reworked, and zones of quasi-horizontal stratification. Considering the revealed features of the physical parameters of the crust material, we conclude that the currently accepted boundaries of individual tectonic blocks in the study area need to be adjusted. The northern boundary of the Balygychan uplift should be mapped along the Pautov fault. The Srednekansky branch of the Inyali-Debinsky synclinorium should be considered a transitional block that belongs to the Sugoi synclinorium, and its name should be changed to the Orotukan block.

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The Lithosphere

Artemieva

2011

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Presenting a coherent synthesis of lithosphere studies, this book covers a range of geophysical methods (seismic reflection, refraction, and receiver function methods; elastic and anelastic seismic tomography; electromagnetic and magnetotelluric methods; thermal, gravity and rheological models), complemented by petrologic and laboratory data on rock properties. It also provides a critical discussion of the uncertainties, assumptions, and resolution issues that are inherent in the different methods and models of the lithosphere. Multidisciplinary in scope, global in geographical extent, and covering a wide variety of tectonics settings across 3.5 billion years of Earth history, this book presents a comprehensive overview of lithospheric structure and evolution. It is a core reference for researchers and advanced students in geophysics, geodynamics, tectonics, petrology, and geochemistry, and for petroleum and mining industry professionals.

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Deep electrical conductivity of East Siberia and the Far East of Russia

Cited by 5 publications

References 1 publication

Global 1°×1° thermal model TC1 for the continental lithosphere: Implications for lithosphere secular evolution

Global 1°×1° thermal model TC1 for the continental lithosphere: Implications for lithosphere secular evolution

Structural Features of the Deep Structure of the Southeastern Yana-Kolyma Fold System From Complex Geophysical Data

The Lithosphere

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