https://repository.kopri.re.kr/handle/201206/5488 2026-04-23T10:37:16Z 2026-04-23T10:37:16Z J. Plane C.F. Boutron P. Cescon C. Barbante P. Gabrielli J.R. Petit P.J. Crutzen C.F. Ferrari G. Cozzi Hong, Sung-Min https://repository.kopri.re.kr/handle/201206/6254 2022-03-24T07:11:45Z 2006-01-01T00:00:00Z

Title: A climatic control on the accretion of meteoric and super-chondritic iridium-platinum to the Antarctic ice cap Authors: J. Plane; C.F. Boutron; P. Cescon; C. Barbante; P. Gabrielli; J.R. Petit; P.J. Crutzen; C.F. Ferrari; G. Cozzi; Hong, Sung-Min Abstract: Meteoric smoke particles (MSPs) form through the vaporization of meteoroids and the subsequent re-condensation of metallic species in the mesosphere. Recently, iridium and platinum enrichments have been identified in Greenland ice layers and attributed to the fallout of MSPs supplying polar latitudes with cosmic matter during the Holocene. However, the MSP fallout to Antarctica during the Earth's climatic history remains essentially unknown. We have determined iridium and platinum in deep Antarctic ice from Dome C and Vostok dated back to 240 kyrs BP. We find high super-chondritic fluxes during warm periods and low meteoric accretion during glacial times, a pattern that is opposite to any known climatic variation in dust fallout to polar regions. The proposed explanation of this accretion regime is a weaker polar vortex during warm periods, allowing peripheral air masses enriched in volcanic iridium and platinum to penetrate inland to Antarctica. The MSP signal emerges only during cold phases and is four times lower than in the Greenland ice cap where more snow accumulates. This suggests that wet deposition is an important route of cosmic material to the Earth's surface.

2006-01-01T00:00:00Z C. Turetta V. Gaspari C. Ferrari F. Planchon G. Cozzi C. Boutron C. Barbante P. Cescon Hong, Sung-Min P. Gabrielli https://repository.kopri.re.kr/handle/201206/6214 2022-03-24T07:11:21Z 2005-01-01T00:00:00Z

Title: Variations in atmospheric trace elements in Dome C (East Antarctica) ice over the last two climatic cycles Authors: C. Turetta; V. Gaspari; C. Ferrari; F. Planchon; G. Cozzi; C. Boutron; C. Barbante; P. Cescon; Hong, Sung-Min; P. Gabrielli Abstract: Concentrations of Li, Mg, Cr, Mn, Co, Cu, As, Rb, Cd, Ba and Bi have been determined by inductively coupled plasma sector field mass spectrometry (ICP-SFMS) in various sections of the new Dome C EPICA Antarctic ice core, down to the depth of 2193 m, covering a time period of two climatic cycles. The time resolution of these records is at least twice as good as previously published ultra trace elements profiles obtained from the Vostok ice core. During the similar to 217kyr period spanned by this record, a high variability in concentrations is observed for most elements, with low values during warm periods and high values during cold periods. The highest concentrations are recorded at the times of the last two glacial maxima (similar to 20 and similar to 140 kyr BP). The timing and the amplitude of the main concentration peaks match remarkably well the insoluble dust concentration profile. It confirms that dust was the main carrier of atmospheric trace elements to East Antarctica during the cold periods. For Ba, Co, Cu and Rb the crustal contribution was also dominant during warm periods. For other elements the situation is more complex during interglacial periods, when other sources such as volcanic quiescent emissions, became possibly significant for several trace elements such as Cd and Bi. Peculiarly high concentration values are observed for Cd and Bi for a short depth interval dated at similar to 18 kyr BP. It is the same depth interval in which elevated F- values were previously observed. These very high concentrations are attributed to fallout from major local volcanic emissions at that time. (c) 2005 Elsevier Ltd. All rights reserved.

2005-01-01T00:00:00Z Jin, Young Keun Chung, Kyung Ho Lee, Ju-Han Kim, Yeadong https://repository.kopri.re.kr/handle/201206/5947 2022-03-24T07:12:13Z 2005-01-01T00:00:00Z

Title: Side-scan sonar survey in the Pechora Sea, Russian Arctic Authors: Jin, Young Keun; Chung, Kyung Ho; Lee, Ju-Han; Kim, Yeadong Abstract: As a study of Arctic marine survey project, Side-scan sonar survey was carried out in the Pechora Seabelonging to the southeaster part of Barents Sea. The study area is a shalow sea 11 m-16 m deep with recent sediments of rich organic carbon. Side-scan sonar profiles show large-scale marine plant communities 2-3 m wide covering the southeastern area. A lot of lineaments are traced on the seafloorWNW-ESE). This trends is thought to be a main path of icebergs. Pockmarks on the seaflor are localydistributed in the area, which are formed by fluid and/or gas discharge. These would be related with petroleum/gas system wel developed around the study area. Dut to weak appearances and limited dis-tribution of the pockmarks, more detailed studies are necessary to examine their nature and structure.Key words Side-scan sonar, Pechora Sea, Arctic, pockmarks

2005-01-01T00:00:00Z Lee, Mi Jung Jaques Moutte Lee, Jong Ik https://repository.kopri.re.kr/handle/201206/6591 2022-03-24T07:12:26Z 2005-01-01T00:00:00Z

Title: Compositional variation of Fe-Ti oxides from the Sokli complex, northeastern Finland Authors: Lee, Mi Jung; Jaques Moutte; Lee, Jong Ik Abstract: The phoscorite-carbonatite complex at Sokli, northeastern Finland, is composed of five stages of intrusions of phoscorites and carbonatites (P1-C1, P2-C2, P3-C3 phoscorites and calcite carbonatites, D4 and D5 dolomite carbonatites) which are cut by numerous lamprophyric dikes. Magnetite is ubiquitous in all constituent rock units of the complex and frequently associates with ilmenite. Most ilmenite intergrowths from the Sokli phoscorite-carbonatite complex occur as internal and/or external granules (composite type exsolutions) or sandwich type exsolution lamellae in the host magnetites. Discrete ilmenite crystals are found only in P3 and C3. Whereas, in the ultramafic lamprophyres ilmenites occur as discrete crystals as well as trellis and sandwich type exsolution lamellae or composite type exsolutions in magnetite. Electron microprobe analyses reveal that magnetite of the Sokli complex belongs essentially to the magnetite-ulv？;spinel solid solution series with a small proportion of magnesioferrite. The compositions of magnetite from the Sokli phoscorite-carbonatite complex vary systematically from stage to stage with increasing Fe2+/(Fe2++Mg) ratio, and decreasing Al, Mn and Ti contents. Magnetite from the ultramafic lamprophyres is characterized by large compositional ranges due to the large amount of mantle-derived xenocrysts. Some grains are particularly high in Cr (up to 21.0 wt.% Cr2O3). Ti-, Mg- and Al-rich aluminous magnesian titanomagnetites are also found, however, most magnetites in the ultramafic lamprophyres are pure magnetite. The compositional variation of ilmenite from the Sokli complex is mainly caused by the substitution of Fe2+ into Mg and Mn, and partly Ti into Nb. Mg- and Mn-rich ilmenites in the early stage P1-C1 rocks evolve towards pure FeTiO3 composition in the latest D5 dolomite carbonatite. Ilmenites from the ultramafic lamprophyres are relatively poor in Mn compared to those from the phoscorite-carbonatite complex. In the coexisting m

2005-01-01T00:00:00Z