A5034510081- Geological and Geochemical Analysis
- High-pressure geophysics and materials
- Cryospheric studies and observations
- Geology and Paleoclimatology Research
- earthquake and tectonic studies
- Polar Research and Ecology
- Landslides and related hazards
- Mineralogy and Gemology Studies
- Winter Sports Injuries and Performance
- Geophysics and Sensor Technology
- Geochemistry and Geologic Mapping
- Seismic Waves and Analysis
- Climate change and permafrost
- Arctic and Antarctic ice dynamics
- Geochemistry and Elemental Analysis
- Rock Mechanics and Modeling
- Geological Studies and Exploration
- Clay minerals and soil interactions
- Metallurgical Processes and Thermodynamics
- Methane Hydrates and Related Phenomena
- Paleontology and Stratigraphy of Fossils
- nanoparticles nucleation surface interactions
Korea Polar Research Institute
2016-2025
Polar Scientific
2019
Korea University
2015-2016
Nagoya University
2015-2016
Hiroshima University
2012-2015
A 58 m long azimuthally oriented ice core has been collected from the floating lateral sinistral shear margin of lower Priestley Glacier, Terra Nova Bay, Antarctica. The crystallographic preferred orientations (CPO) and microstructures are described in order to correlate geometry anisotropy with constrained large-scale kinematics. Cryogenic Electron Backscatter Diffraction analysis shows a very strong fabric ( c -axis primary eigenvalue ∼0.9) -axes aligned horizontally sub-perpendicular...
Stromatoporoid sponges were important reef-builders during the middle Paleozoic, yet their early history and integration into reef ecosystems remain poorly understood. Here, we report Lophiostroma leizunia Jeon sp. nov., oldest known stromatoporoid from upper Tremadocian to lower Floian (~480 My-old) strata of South China. L. formed complex structures, playing crucial roles in framework construction binding other components, including calcimicrobes, lithistid sponges, stalked echinoderms,...
We use high resolution, ground-based observations of ice displacement to investigate deformation across the floating left-lateral shear margin Priestley Glacier, Terra Nova Bay, Antarctica. Bare conditions allow us fix survey marks directly glacier surface. A combination continuous positioning a local reference mark, and repeat network 33 stakes installed 2 km width are used quantify strain rates response tidal forcing over an 18-day period. Along-flow velocity observed at Global Navigation...
Abstract Deformation microstructures for a lawsonite blueschist from the N ew I dria serpentinite body, D iablo R ange, are investigated to clarify rheological behaviors of glaucophane and lawsonite, which main mineral assemblages subducting oceanic crust at relatively cold geotherm. Developments crystal‐preferred orientations ( CPOs ) with small grain size, irregular boundary high aspect ratio indicate deformation mechanism as recovery dynamic recrystallization possibly accommodated by...
Abstract A series of simple‐shear experiments on blueschist was performed at 400–500°C and 1–2.5 GPa to understand the deformation seismically active, subducting oceanic crust. The show that brittle microstructures are mainly found pressures 1–2 GPa, whereas ductile form 2.5 GPa. J ‐indices (a measure fabric intensity) glaucophane crystal preferred orientations change systematically with changing shear strain confining pressure, angle between slip plane direction samples deformed >2 is...
Abstract. Crystallographic preferred orientations (CPOs) are particularly important in controlling the mechanical properties of glacial shear margins. Logistical and safety considerations often make direct sampling margins difficult, geophysical measurements commonly used to constrain CPOs. We present here first comparison seismic ultrasonic data with measured CPOs a polar margin. The CPO from ice samples 58 m deep borehole left lateral margin Priestley Glacier, Antarctica, is dominated by...
Abstract Lacustrine stromatolites serve as important archives for recording environmental changes, and the detailed examination of their microfabrics is essential understanding formative processes changes embedded within them. This study explored application Electron Backscatter Diffraction combined with Energy‐Dispersive X‐ray Spectroscopy to investigate a well‐preserved middle Cretaceous lacustrine stromatolite from south‐eastern Korea, unveiling ultra‐high‐resolution sedimentary that are...
We investigated the microstructures of five ice core samples from Styx Glacier, northern Victoria Land, Antarctica. Evidence dynamic recrystallization was found in all samples: those at 50 m mainly by polygonization, and 170 m, largely grain boundary migration. Crystallographic preferred orientations analyzed (view surface) typically showed a single cluster c-axes normal to surface. A girdle intersecting occurs 140–170 with tight a-axes girdle. interpret change crystallographic (CPOs)...
Abstract Iron‐rich olivine is mechanically weaker than of mantle composition, ca. Fo 90 , and thus more amenable to study under a wide range laboratory conditions. To investigate the effects iron content on deformation‐produced crystallographic preferred orientation (CPO) grain size, we analyzed microstructures samples with compositions 70 50 0 that were deformed in torsion either anhydrous or hydrous conditions at 300 MPa. Electron backscatter diffraction (EBSD) observations reveal...
Abstract. Crystallographic preferred orientations (CPOs) are particularly important in controlling the mechanical properties of glacial shear margins. Logistical and safety considerations often make direct sampling margins difficult geophysical measurements commonly used to constrain CPOs. We present here first comparison seismic ultrasonic data with measured CPOs a polar margin. The CPO from ice samples 58 m deep borehole left lateral margin Priestley Glacier, Antarctica, is dominated by...
Abstract. We investigated the mineral assemblage, and bulk-rock chemistry, zircon U–Pb age of a manganiferous quartzite layer in Lanterman Range, northern Victoria Land, Antarctica. The assemblage consists primarily phengite quartz, along with spessartine-rich garnet, Mn3+ rare earth element–yttrium (REY)-zoned epidote-group minerals, titanohematite. Mineral inclusions such as tephroite, rutile pyrophanite are hosted porphyroblasts latter three minerals suggest prograde blueschist-facies to...
The Terra Nova Intrusive Complex (TNIC) in northern Victoria Land, Antarctica, results from widespread magmatism during the Early Paleozoic Ross Orogeny. According to field relationships, geochemistry, and geochronology data, part of TNIC comprises Browning Unit (BIU), which is associated with an arc crustal melting including migmatization Wilson Metamorphic Complex, later Campbell (CIU), attributed mantle processes. Zircon U-Pb ages suggest Late Neoproterozoic Cambrian protolith...