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정기영(Gi Young Jeong),김혜빈(Hye Bin Kim) 한국광물학회 2002 광물과 암석 (J.Miner.Soc.Korea) Vol.15 No.3
Biotite and its weathering products in the weathering profile of Andong granite were examined using X-ray diffraction, chemical analysis, and electron microscopy, Major weathering product of biotite was oxidized biotite, which is decomposed into kaolinite in the upper part. Discrete vermiculite or hydrobiotite was not detected although minor vermiculite (5%) was randomly interstratified with oxidized biotite. Excess positive charge induced by iron oxidation was balanced by release of Fe (16%) and Mg (12%) from octahedral site and K (13%) from interlayer site. After slight chemical and structural modification induced by iron oxidation, oxidized biotite persists through the weathering profiles with partial decomposition in the upper part of the profile. Formation environments and dissolution experiments of oxidized biotite highly resistant to weathering are required to understand the elemental behavior in the surface environments on the biotite-bearing bedrocks.
남극 사우스셰틀란드 해양퇴적물내 스멕타이트의 광물학적 특성과 기원
정기영(Gi Young Jeong),윤호일(Ho Il Yoon) 한국광물학회 2002 광물과 암석 (J.Miner.Soc.Korea) Vol.15 No.1
Mineral composition and chemistry of the clay minerals in the three cores from the continental shelves of South Shetland Islands. (NCS09) and Anberse Island (GC98-2), and from the fjord of King George Island(A10-01) were determined by X-ray diffraction and electron microprobe analysis in search of the distributions and origin of the clay minerals in the Antarctic marine sediments. Smectite content is relatively high in NCS09 regardless of core depths (av. 8.3%), but low in GC98-2(1.1%). In A10-01, smectite content is higher in the upper section than in the lower section. Kaolinite was not detected from all the cores in this study. Yellow to yellowish green clay granules were commonly scattered in the sediments of NCS09 cores. The clays contain 16.97% Fe_2O_3 and 2.53% K_2O. Average structural formula of the clay indicates ferrian beidellite. The (Fe, K)-rich smectite of NCS09 must have been derived from relatively young basaltic volcanics altered by reaction with seawater near South Shetland Islands by glacial erosion or eolian process related to volcanic eruption. GC98-2 nearer to Antarctic continent is very low in smectite content. In A10-01, the lower diamicton was deposited from the glacial erosion of smectite-free ancient volcanics in the interior of King George Island, while the upper section was derived from the smectite-bearing terrestrial debris and eolian materials after retreat of glaciers in Marian Cove and ice cover in Barton Peninsula. The high K contents of smectites suggest the interstratification of illite and smectite layers, which might be observed by future TEM lattice fringe imaging.