| Last modified 06/2019 |
My research highlights
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THE LITHOSPHERE
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A global 1 deg x 1 deg thermal model for the continental lithosphere TC1 constrained from the statistical
relationships between continental geotherms and tectono-thermal ages.
These two global models for the continental lithosphere have been used to calculate:
Thermal structure of the continental lithosphere – a global study:
Lithosphere formation and basal erosion:
Compositional variations in continental lithosphere constrained by seismic and thermal data:
Gravity constraints on lateral compositional variations in continental lithosphere:
Global trends in crustal structure and evolution
Heat production in granitic rocks and global evolution:
relationships between continental geotherms and tectono-thermal ages.
These two global models for the continental lithosphere have been used to calculate:
- lithospheric volume through time from Archean till present;
- growth and preservation rate for the lithosphere from Archean till present;
- correlation between lithospheric growth rate and growth rate of juvenile crust;
- correlation between lithospheric growth rate and global tectonic events;
- correlation between lithospheric structure and anorogenic magmatism (anorthosites and rapakivi).
Thermal structure of the continental lithosphere – a global study:
- A global, consistent thermal model for stable continental lithosphere calculated from the data on the
surface heat flow (temperature distribution in the lithosphere, lithospheric thickness, mantle heat flow); - A global 1 deg x 1 deg thermal model for the continental lithosphere TC1 constrained from the statistical
relationships between continental geotherms and tectono-thermal ages. - Distinct stages of lithosphere formation have been linked to secular changes in mantle dynamics,
- Correlation of thermal regime of the continental lithosphere with xenolith geotherms, electrical conductivity
of the upper mantle, and elastic thickness.
Lithosphere formation and basal erosion:
- Correlations between cratonic size, plate velocities, ridge push, slab pull and lithospheric thickness,
- The role of mantle processes on lithosphere erosion.
Compositional variations in continental lithosphere constrained by seismic and thermal data:
- A correlational analysis of global maps of the thermal structure of the continental lithosphere with global
elastic and anelastic seismic tomography models as determined from Rayleigh waves for the upper 200 km
of the mantle; - Calculation of seismic elastic and anelastic anomalies that cannot be explained by temperature variations
alone.
Gravity constraints on lateral compositional variations in continental lithosphere:
- Mantle residual gravity anomalies are used to examine the effects of temperature and chemical depletion
on lithospheric density. - Density variations in the cratonic roots caused by non-thermal (compositional) variations.
Global trends in crustal structure and evolution
- A new approach to classify tectonic origin of the crust based on relative thickness of 3 major crustal layers
Heat production in granitic rocks and global evolution:
- New database on heat production in granites allowed to calculate global K-Th-U ratios and recognize a
strong peak in mid-Proterozoic, which may be related to a supecontinent cycle.
Most of these results can be downloaded from the Publications page |
Continental crust: Structure, composition and evolution
- Europe,
- the North Atlantic region,
- Siberia,
- North China Craton,
- Arctic Ocean,
- southern Africa.
- East European craton, rifting-related metasomatism and mechanisms of platform subsidence,
- Siberian craton and restriction of isopycnicity to kimberlite regions,
- cratons of southern Africa, correlations with kimberlites,
- West Siberian basin and mechanisms of basin subsidence;
- North China craton and the extent of cratonic lithosphere destruction;
- North Atlantic region, anomalous mantle temperatures and the Iceland anomaly.
- These models are based on a new thermal isostasy method:
- East European craton,
- Greenland,
- Anatolia
Geophysical synthesis of the upper mantle structure in Europe and lithospheric processes:
- A joint analysis of different geophysical data sets (seismic tomography from surface and body waves, upper mantle reflectivity, gravity and
thermal data) and the role of major tectonic processes in formation of lithospheric structure of Europe: from Proterozoic terrain accretion and
subduction, to Phanerozoic rifting, volcanism, subduction and continent-continent collision; - An integrated model of physical properties of the European subcrustal lithosphere.
Upper mantle rheology and creep in young orogens:
- The relation of rheology to thermal regime of the lithosphere; mantle creep in young orogens of the continents;
- The origin of seismic anisotropy at various depths as related to tectonic stress, geotherms, and rheology, with a focus on young continental
orogens; - The concept of crustal “escape tectonics” as extended to the uppermost mantle: examples for different continental orogens.
Lithosphere thinning during tectonic rejuvenation:
- Thermal thinning of the lithosphere caused by an ascent of anomalous mantle to the base of the lithosphere, partial melting of lithospheric
material, its consecutive replacement by material from the anomalous mantle, lithosphere thinning, and isostatic uplift of lithospheric blocks.
motions.
Evolution of the thermal regime of the lithosphere of regions of Cenozoic tectonism and magmatism:
- Petrologic data on temporal changes of magma composition in intracontinental regions of Cenozoic magmatism is used to quantify lithosphere
thinning in terms of P-T-t characteristics; - Secular variations in mantle heat flow required to produce observed evolution of lithospheric thickness in time;
Thermal constraints on the mechanisms of the Cenozoic uplift of the Tien-Shan:
- Cenozoic tectonic uplift of the Tien Shan interpreted in terms of a non-developed continental rift as supported by geophysical data;
- Data on the uplift history for the past 25 Ma is used to estimate thermal regime of the mantle and to calculate the isostatic response of the
lithosphere to active processes in the mantle.
1. Global studies
2. Regional studies
| Professor Irina M. Artemieva Geology Section, IGN University of Copenhagen Øster Voldgade 10 Copenhagen DK-1350 Denmark Email: iartemieva@gmail.com |