Lateral heterogeneity and vertical stratification of cratonic lithospheric keels: a case study of the Siberian craton

Irina Artemieva, Yulia Cherepanova, Matija Herceg, Hans Thybo

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Abstract

We present geophysical models for the lithospheric mantle of the Siberian craton, with focus on its structure
and thermo-compositional heterogeneity as constrained by various geophysical data. The latter include thermal
structure of the lithosphere based on surface heat flow data and supported by regional xenolith P-T arrays,
lithosphere density heterogeneity as constrained by free-board and satellite gravity data, and the non-thermal
part of upper mantle seismic velocity heterogeneity based on joint analysis of thermal and seismic tomography data.
Density structure of the cratonic lithosphere constrained independently by free-board and satellite gravity
shows significant lateral variations, that are well correlated with crustal structure, surface tectonics, and regional
xenolith data. Proterozoic sutures and intracratonic basins are manifested by an increase in mantle density as compared
to light and strongly depleted lithospheric mantle of the Archean nuclei, particularly below the Anabar shield.
Since we cannot identify the depth distribution of density anomalies, we complement the approach by seismic
data. An analysis of temperature-corrected seismic velocity structure indicates strong vertical and lateral
heterogeneity of the cratonic lithospheric mantle, with a pronounced stratification in many Precambrian terranes.
We discuss lateral and vertical heterogeneity of the cratonic lithosphere discussed in connection to regional
tectono-thermal evolution.
Original languageEnglish
JournalGeophysical Research Abstracts
Volume16
Pages (from-to)1
ISSN1607-7962
Publication statusPublished - 2014
Externally publishedYes
EventEuropean Geosciences Union General Assembly 2014 - Vienna, Austria
Duration: 27 Apr 20142 May 2014

Conference

ConferenceEuropean Geosciences Union General Assembly 2014
Country/TerritoryAustria
CityVienna
Period27/04/201402/05/2014

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