Hemin Koyi
Uppsala University, Department of Earth Sciences, Faculty Member
- • Professor in Tectonics and Geodynamics • Director of The Hans Ramberg Tectonic Laboratory, Uppsala University (200... more• Professor in Tectonics and Geodynamics
• Director of The Hans Ramberg Tectonic Laboratory, Uppsala University (2007-present). In a recent assessment (KoF 2011) by an international panel, the tectonic lab was rated as one of the world leading labs. The panel stated; ‘They are amongst the world leaders in laboratory-based structural geology.’
• Member of an International Panel for evaluation of Turku University, Finland (2015).
• Chairman of the Evaluation Panel (Geoscienes), at the Portuguese Research Council (Fundação para a Ciência e a Tecnologia, I.P. (FCT)). (2015-)
• Member of the Habilitation (Docent) Committee of the Faculty of Science and Technology, Uppsala University. (2012 - present).
• Guest Professor at the Petroleum University in Beijing, China (2010-present).
• Chairman of the Evaluation Committee (Geology and Geophysics), at the Swedish Research Council (2010-present). This committee comprises Swedish and international experts within the fields of geology and geophysics. The committee assesses the scientific content of all applications which are annually sent to the Swedish Research Council and makes the final decision on financial support of the most successful applications.
• Member of The Danish Council for Independent Research | Natural Science (2011-2014). Rules for Independent Research | Natural Sciences, § 2 states “The Council consists of 15 members who are renowned researchers and appointed by the Minister for Research, Innovation and Higher Education in their personal capacity.”
• Head of the Solid-Earth Geology-responsible for the administrative, financial and research activities, (2006-July 2012).
• Member of the Steering Committee of the Department of Earth Sciences (2006 – July 2012).
• Chairman of the International Geosciences Peer Review Panel of the Danish Council for Independent Research | Natural Sciences. (2010).
Research Interest - Deformational Geology (Structural geology and Tectonics);
* Modelling of rock-deforming processes in the crust and mantle lithosphere.
* Hydrocarbon-related and exploration structural geology.
* Structural control on groundwater accumulation and aquifer deformation.
* Rock deformation.edit
This contribution reviews our current understanding of the tectonic development of the Amerasia Basin and presents new analogue modelling results relating to its formation. The Amerasia Basin is se ...
Research Interests:
Research Interests:
Research Interests:
Research Interests:
Research Interests:
The tectonic development of the Amerasia Basin and its sub‐domains (the Canada Basin, the Makarov‐Povodnikov basins, the Alpha‐Mendeleev Ridges, and the Chukchi Plateau) has long been debated. Rec ...
Research Interests:
The Hormuz- and the Namakdan salt diapirs extrude as parabolic profiles in the last 10 4 years. Velocity profiles of salts extruding through these diapirs are derived assuming Newtonian viscous flow of salts. Viscosity of salt in these... more
The Hormuz- and the Namakdan salt diapirs extrude as parabolic profiles in the last 10 4 years. Velocity profiles of salts extruding through these diapirs are derived assuming Newtonian viscous flow of salts. Viscosity of salt in these diapirs are calculated to be 10 18-10 21 Pa s and10 17-10 21 Pa s, respectively.
Research Interests:
Research Interests:
Research Interests:
Research Interests:
Research Interests:
Research Interests: Earth Sciences, Geology, Sedimentology, Structural Geology, Deformation and strain, and 11 moreAnalogue Modeling, Zagros, Fold Style in Zagros Fold and Thrust Belt, Sandbox Analogue Modeling, tectonic evolution of Zagros Orogenic Belt, Basement Topography, Cover Thickness Variation, Thrust, Convergent Settings, Basement, and Fold and thrust belt
DOI = 10.3126/hjs.v5i7.1286 Himalayan Journal of Sciences Vol.5(7) (Special Issue) 2008 p.92
Research Interests:
When numerical and analogue models are used to investigate the evolution of deformation processes in crust and lithosphere, they face specific challenges related to, among others, large contrasts in material properties, the heterogeneous... more
When numerical and analogue models are used to investigate the evolution of deformation processes in crust and lithosphere, they face specific challenges related to, among others, large contrasts in material properties, the heterogeneous character of continental lithosphere, the presence of a free surface, the occurrence of large deformations including viscous flow and offset on shear zones, and the observation that
Research Interests: Geology, Structural Geology, Benchmarking, Laboratory experiment, Large Deformation Mechanics, and 15 moreFirst-Order Logic, Continental Tectonics, Shear Zone, Free Surface, Cross Section, First Order Logic, Numerical Model, Boundary Condition, Viscous Flow, Model Building, Material Properties, Deformation Mechanism, Model verification, Root mean square, and Root mean square error
An out-of-sequence thrust (OOST) has been established inside the Higher Himalaya by previous workers more frequently from Nepal- and Bhutan Himalaya. The OOST lies between the South Tibetan Detachment System-Upper (STDSU) and the South... more
An out-of-sequence thrust (OOST) has been established inside the Higher Himalaya by previous workers more frequently from Nepal- and Bhutan Himalaya. The OOST lies between the South Tibetan Detachment System-Upper (STDSU) and the South Tibetan Detachment System-Lower (STDSL). The thrust has been recognized as the Kakhtang Thrust in Bhutan (Grujic et al., 2002 and references therein); Khumbu Thrust (Searle, 1999), Modi Khola Shear Zone (Hodges et al., 1996), Kalopani Shear Zone (Vannay and Hodges, 1999), Toijem Shear Zone in Nepal (Carosi et al., 2007), Chaura Thrust (Jain et al., 2000)- also designated as the Sarahan Thrust (Chambers et al., 2008) in the western Indian Himalaya in Sutlej section, Zimithang Thrust in the eastern Indian Himalaya (Yin et al., 2006), as `physiographic transition' in Marsyandi valley, Nepal (Burbank et al., 2003). We note that considering the upper strand of the Main Central Thrust (the MCTU) as the lower boundary of the Higher Himalaya, the physiog...
Research Interests:
Research Interests:
Two‐dimensional thermal‐mechanical models of thick‐skinned, salt‐based fold and thrust belts, such as the Zagros, SW Iran, are used to address: (1) the degree of deformation and decoupling between cover and basement rocks due to the... more
Two‐dimensional thermal‐mechanical models of thick‐skinned, salt‐based fold and thrust belts, such as the Zagros, SW Iran, are used to address: (1) the degree of deformation and decoupling between cover and basement rocks due to the presence of a weak salt detachment, (2) the reactivation potential of pre‐existing basement normal faults due to brittle or ductile behavior of the lower crust (as related to cold or hot geothermal gradients), and (3) variations in deformation style and strain distribution. The geometry and kinematics of the orogenic wedge and the activity of pre‐existing basement faults are strongly influenced by the geothermal gradient (defined by the Moho temperature, MT) and basement rheology. We infer that the MT plays a major role in how the lower and upper crust transfer deformation toward the foreland. In relatively hot geotherm models (MT = 600°C at 36 km depth), the lowermost basement deforms in a ductile fashion while the uppermost basement underlying the sedi...
Research Interests: Geology, Geophysics, Structural Geology, Numerical Modeling, Deformation and strain, and 15 moreSalt Tectonics, Finite Elements, Plate Tectonics, Active Tectonics, Earthquakes, Brittle Rheology, Basement Faulting, Compressional Systems, Rock Rheology and Microstructures In the Deformed and Undeformed Rocks In the Deformational Regimes of Ductile, Salt Decollement, Gravity Gliding, Salt Detachment, Deformation Decoupling, Compressional Tectonics, and Fold and thrust belt
Research Interests:
Research Interests:
Detailed geological mapping, dating, and gravimetric and seismic data are used to interpret the Lansarine–Baouala salt structure (North Tunisia) as a salt canopy emplaced during the Cretaceous Period. The extensional tectonic regime... more
Detailed geological mapping, dating, and gravimetric and seismic data are used to interpret the Lansarine–Baouala salt structure (North Tunisia) as a salt canopy emplaced during the Cretaceous Period. The extensional tectonic regime related to the Cretaceous continental margin offered at least two factors that encouraged buried Triassic salt to extrude onto the sea floor and flow downslope: (i) extension induced normal faults that provided routes to the surface, and led to the formation of sub-marine slopes along which salt could flow; (ii) this structural setting led to differential sedimentation and consequently differential loading as a mechanism for salt movement. The present 40-km-long Lansarine–Baouala salt structure with its unique mass of allochthonous Triassic salt at surface was fed from at least four stems. The salt structure is recognized as one of the few examples worldwide of a subaerial salt canopy due to the coalescence of submarine sheets of Triassic salt extruded i...
Research Interests:
Research Interests:
... of Earth Sciences, Villav. 16, 752 36 Uppsala, Sweden. Hemin. Koyi@ geo. uu. ... Winter Meeting, Uppsala, Sweden. Merchant, E.(1945), Mechanics of the Metal Cutting process. II. Plasticity conditions in orthogonal Cutting, J. Appl.... more
... of Earth Sciences, Villav. 16, 752 36 Uppsala, Sweden. Hemin. Koyi@ geo. uu. ... Winter Meeting, Uppsala, Sweden. Merchant, E.(1945), Mechanics of the Metal Cutting process. II. Plasticity conditions in orthogonal Cutting, J. Appl. Phys., 16, 318-324. ...
Research Interests: Geology and Dissipation
An out-of-sequence thrust (OOST) has been established inside the Higher Himalaya by previous workers more frequently from Nepal-and Bhutan Himalaya. The OOST lies between the South Tibetan Detachment System-Upper (STDSU) and the South... more
An out-of-sequence thrust (OOST) has been established inside the Higher Himalaya by previous workers more frequently from Nepal-and Bhutan Himalaya. The OOST lies between the South Tibetan Detachment System-Upper (STDSU) and the South Tibetan Detachment System-Lower (STDSL). The thrust has been recognized as the Kakhtang Thrust in Bhutan (Grujic et al., 2002 and references therein); Khumbu Thrust (Searle, 1999), Modi Khola Shear Zone (Hodges et al., 1996), Kalopani Shear Zone (Vannay and Hodges ...
Geodetic measurements, earthquake distributions and analysis of topography imply simultaneous thin-and thick-skinned deformation in the Zagros fold-thrust belt. A series of 2-D thermomechanical numerical experiments with initial... more
Geodetic measurements, earthquake distributions and analysis of topography imply simultaneous thin-and thick-skinned deformation in the Zagros fold-thrust belt. A series of 2-D thermomechanical numerical experiments with initial rectangular configuration of 300km by 30km were run to investigate crustal scale deformation during the development of the Zagros. The shortening experiments evaluate the possible interaction of pre-existing faults in Pre-Cambrian crystalline basement with the sedimentary cover in the presence of a 1-2 ...
Research Interests:
Numerical and analogue modelling techniques are widely used to investigate the evolution of geological structures, but are often applied separately. The comparison of results of both methods may, however, help establish robust features of... more
Numerical and analogue modelling techniques are widely used to investigate the evolution of geological structures, but are often applied separately. The comparison of results of both methods may, however, help establish robust features of tectonic models. We test the similarity of numerical and analogue models by comparing results directly in a qualitative and quantitative manner. We examine a brittle convergent thrust wedge experiment in which layers with alternating frictional properties are shortened. Seven ...
Research Interests:
Research Interests:
Research Interests:
Kinematics of structures and active tectonics of an active orogenic belt, Alborz Mountains, northern Iran: New insights from scaled analogue modeling
Research Interests:
Research Interests:
The switch in direction of convergence between Central Iran and the Eurasian plate isbelieved to have a significant impact on the structural style in the Alborz Mountains, in northof Iran. To under ...
Research Interests:
A series of scaled analogue models are used to study (de)coupling between basement and cover deformation. Rigid basal blocks were rotated about a vertical axis in a ‘bookshelf’ fashion, which caused strike-slip faulting along the blocks... more
A series of scaled analogue models are used to study (de)coupling between basement and cover deformation. Rigid basal blocks were rotated about a vertical axis in a ‘bookshelf’ fashion, which caused strike-slip faulting along the blocks and in the overlying cover units of loose sand. Three different combinations of cover–basement deformations are modelled: (i) cover shortening before basement fault movement; (ii) basement fault movement before cover shortening; and (iii) simultaneous cover shortening with basement fault movement. Results show that the effect of the basement faults depends on the timing of their reactivation. Pre- and syn-orogenic basement fault movements have a significant impact on the structural pattern of the cover units, whereas post-orogenic basement fault movement has less influence on the thickened hinterland of the overlying belt. The interaction of basement faulting and cover shortening results in the formation of rhombic structures. In models with pre- and...
Research Interests:
Research Interests:
uu.se. Publications. ...
Research Interests:
Abstract Salt diapirs can be asymmetric both internally and externally reflecting their evolution history. As such, this asymmetry bear a significant amount of information about the differential loading (±lateral forces) and in turn the... more
Abstract Salt diapirs can be asymmetric both internally and externally reflecting their evolution history. As such, this asymmetry bear a significant amount of information about the differential loading (±lateral forces) and in turn the salt supply that have shaped the diapir. In two dimensions, In this study we compare results of analogue and numerical models of diapirs with two natural salt diapris (Klodawa and Gorleben diapirs) to explain their salt supply and asymmetric evolution. In a NW-SE section, the Gorleben salt diapir possesses ...
Research Interests:
Research Interests:
Research Interests:
Research Interests:
Research Interests:
uu.se. Publications. ...
Research Interests:
uu.se. Publications. ...