Junghyun Park 해외연사 초청세미나(2024.07.26)
1. 제목: Advances in Seismoacoustic Science and Technology Based on the Long-Term Network Operations 2. 연사: Junghyun Park 3. 소속: Southern Methodist University 4. 일시: 2024-07-26 (금) 오전 11:00 5. 장소: 자연과학대학 25-1동 406호 6. 문의: 25-1동 504호 지구물리연구실 (tel. 02-885-6130)
The flotation of magmatic sulfides transfers Cu-Au from magmas to seafloor massive sulfide deposits
Copper and gold-rich seafloor massive sulfide deposits formed in intra-oceanic subduction settings are typically associated with hydrated and oxidized magmas, but processes leading to their formation remain controversial. Whilst S-undersaturated differentiation is acknowledged as the process enriching these metals in magmas, it remains unclear whether copper and gold partitioned into sulfides or aqueous fluids. Here […]
Role of chalcophile element fertility in the formation of the eastern Tethyan post-collisional porphyry Cu deposits
Post-collisional porphyry Cu deposits are genetically related to the magmas generated by partial melting of sulfide-bearing lithosphere fertilized by subduction components. The ore-forming magmas are suggested to be enriched in chalcophile elements compared to the barren magmas. However, the chalcophile element contents in the post-collisional magmas and its role in controlling the porphyry ore formation […]
Melt-Rock Reaction in the Lower Oceanic Crust and the Influence on the Evolution of Mid-Ocean Ridge Basalts at the Central Indian Ridge (7°50′–8°30′S)
Various crustal processes shape both the lower oceanic crust and mid-ocean ridge basalts (MORBs). To better understand how these crustal processes influence MORB compositions, we conducted comprehensive petrographic and geochemical investigations on gabbroic rocks and erupted lavas dredged from a segment of the Central Indian Ridge (CIR) spanning from 7°50′S to 8°30′S. The petrographic and […]
Mascarene basin asthenosphere reservoir source and composition revealed by Central Indian Ridge basalt geochemistry
Along the Central Indian Ridge (CIR), the geochemical and isotopic signature of mid-ocean ridge basalts (MORB) from three segments between 8° and 12°S show a FOZO-like enrichment with elevated 3He/4He (R/RA) (> 10 RA), suggesting small-scale upwelling with a deep primordial mantle component. Based on complementary major and trace elements analysis as well as Sr, Nd […]
Deformation microstructures of fault rocks from the northern Yangsan Fault, SE Korea: implications for coseismic and aseismic behavior
The Yangsan Fault, a long-lived intracontinental fault in SE Korea, exhibits various slip behaviors, including coseismic slip and aseismic creep. However, there is insufficient knowledge of deformation microstructures to reveal the deformation mechanisms operating within the fault. In this study, we present an analysis of the mechanical behaviors displayed by the Byeokgye section of the […]
Deformation microstructures and seismic anisotropy of Yeoncheon amphibolites in the Imjingang Belt, South Korea
The Imjingang Belt preserved the deformation and metamorphism of rocks related to the Permo-Triassic continental collision between the North and South China Cratons. To understand the microstructural evolution of amphibolites, microstructures of hornblendes in Yeoncheon amphibolites and psammitic schists were analyzed using electron back-scattered diffraction mapping and transmission electron microscopy. Two different types of lattice […]
Deformation microstructures of blueschists in Alpine Corsica, France, and implications for seismic anisotropy and the low-velocity layer in subducting oceanic crust
Understanding the deformation microstructures and seismic properties of blueschists is important for interpreting the seismic anisotropy at the top of subducting oceanic crust. The deformation microstructures and seismic properties of epidote blueschist, epidote-lawsonite blueschist, and lawsonite blueschist from Alpine Corsica, France, were studied using electron backscatter diffraction mapping and transmission electron microscopy. The crystal-preferred orientations […]
Microstructural and microchemical analysis of zircon in a syenite lithic fragment from Ulleung Island volcano, South Korea
Background The intricate textural patterns commonly observed in metamorphosed and recrystallized zircon (ZrSiO4) underscore the crucial necessity of understanding the underlying mechanisms governing their formation to ensure accurate interpretation of the chemical and isotope data they contain. This study employed a combination of microanalytical techniques, including electron backscattered diffraction (EBSD) analysis, electron microprobe (EMP) mapping, […]
Machine Augmented Knowledge Discovery for Geosciences
1. 제목: Machine Augmented Knowledge Discovery for Geosciences 2. 연사: Eun-Jung Holden 3. 소속: The University of Melbourne 4. 일시: 2024-07-30 (화) 오전 11:00 5. 장소: 자연과학대학 25-1동 406호 6. 문의: 25-1동 301호 해양암석지구화학연구실 (tel. 02-880-8125)
