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남극 킹조지섬 바톤반도의 열수변질작용에 관한 K-Ar 연대와 지구화학
허순도,이종익,황정,최문영,Hur, Soon-Do,Lee, Jong-Ik,Hwang, Jeong,Choe, Moon-Young 한국해양과학기술원 2001 Ocean and Polar Research Vol.23 No.1
K-Ar ages of the altered rocks from the Barton Peninsula are belows; altered tuffaceous andesite from southwestern part is 42 Ma, altered rocks contacted with quartz vein from southern part are 28 and 33 Ma, and advanced argillic altered andesite from northeastern part are 33 and 35 Ma. Those K-Ar ages are 10 My younger than granitic rocks of the Barton Peninsula. Hydothermal alteration of the Barton Peninsula was originated from mixing of magmatic water from parent magma of granitic rocks with meteoric water. The Al content in the hostrock is relatively constant during hydrothermal alteration, on the contrary the Mg content is in proportion to total alkali. The variation of total alkali and Mg contents in hydrothermal alteration indicates that those elements was washed out during hydrothermal alteration. The sequences of hydrothermal alteration of the Barton Peninsula is chloritization of amphiboles, sericitization of feldspars and kaolitization of sericite.
서태평양 캐롤라인군도 웨노섬 알칼리 현무암류의 지구화학 및 K-Ar 연대
이종익,허순도,박병권,한상준,Lee, Jong-Ik,Hur, Soon-Do,Park, Byong-Kwon,Han, Sang-Jun 한국해양과학기술원 2001 Ocean and Polar Research Vol.23 No.1
Geochemical and Sr-Nd isotopic compositions and K-Ar ages are analyzed in volcanic rocks from Weno Island, Caroline Islands. Seven Weno lava samples of alkali basalt and basaltic trachyandesite are aphyric or sparsely phyric comprising olivine, plagioclase, and clinopyroxene phenocrysts. Whole-rock geochemical variation of Weno lavas reflects main fractional crystallization of olivine and Cr-spinel phenocrysts. Newly determined K-Ar ages of Weno lavas range from 6.7 to 11.3 Ma (late Miocene), indicating their formation during primary volcanic stage of Chuuk Islands. Trace element compositions of Weno lavas are very similar to those of typical ocean island basalts (OIBs), suggesting their formation during intra-plate mantle plume activity. The plume composition is isotopically very similar to that of Hawaiian hot spot. However, the age span of Chuuk volcanism is longer than that of the other individual volcanoes in the Pacific.
유비철석을 함유하는 황철석 약광물의 수치 후 비소 제거효과
황 정(Hwang Jeong),허순도(Hur Soon Do) 대한자원환경지질학회 2003 자원환경지질 Vol.36 No.6
황철석은 흔히 유비철석과 밀접히 공생하여 산출되므로 유비철석을 포함하는 황철석을 약광물로 이용할 때에는 비소의 독성에대한 세심한 주의가 필요하다 . 독성을 감소시키기 위해서는 약재를 가열하여 식초에담금질하는 전통적 초쉬법을 적용하여 왔다 . 초쉬법의 과학적 효과를 검토하기 위해 유비철석을 포함하는 황철석 약재를 450 o C, 650 o C 그리고 850 o C 각각의 온도에서 가열하여 식초에 담금질하는 과정을 5 회까지 반복하였다 . 약재 내 유비철석은 450 o C 에서 초쉬법을 5 회 실시하여도 잔존하나 , 650 o C 에서는 초쉬법을 1 회 실시하면 완전히 제거된다 . 450 o C 에서 수치된 약재에서는 비소가 상당량 함유되어 있으나 , 650 o C 와 850 o C 에서 수치된 약재에서는 비소함량이 급격히 감소한다 . 약재 로부터 수용액으로 용출되는 비소 용출량이 가장 적은 수치조건이 가장 효과적인 수치법일 것임을 전제로 비소 용출 실험을 실시하였다 . 수용액내 비소의 용출량은 450 o C 에 서 가장 높고 , 650 o C 와 850 o C 에서는 급격히 감소한다 . 그러나 850 o C 에서 수치된 약재의 비소 용출량도 음용수 수질기준을 초과한다 . 수치온도가 높을수록 유비철석의 제거가 증대 되고 약재 내 비소함량과 비소 용출량이 감소하나 , 수치횟수의 효과는 뚜렷하지 않다 . 수치횟수 보다는 수치온도가 상대적으로 비소제거에중요한 요인이며 , 비소제거를 위해서는 650 o C 이상의 온도에 서 황철석을 수치하는 것이 필요하다 . As pyrite is commonly associated with arsenopyrite, the use of pyrite including arsenopyrite for medicine requires close attention on arsenic toxicity. The toxicity was reduced by traditional processing operations include heating and quenching in vinegar. To verify the scientific effects of this process, pyrite containing many crystals of arsenopyrite was processed at temperatures from 450 o C to 850 o C and through as many as 5 processing cycles. Arsenopyrite completely disappeared when processed only once at 650 o C while it remained even after 5 processing cycles at 450 o C. Arsenic was most abundant in medicinal mineral samples processed at 450 o C and sharply decreased when processed at 650 o C or 850 o C. And arsenic extraction test in water was carried out from the processed pyrite medicine on the assumption that pyrite medicines with the lowest As metal content would be most desirable. Arsenic were most abundant in water extracted from medicinal mineral samples processed at 450 o C and sharply decreased when processed at 650 o C or 850 o C. But the extracted As concentrations in water exceeded drinking water standards even when processed at 850 o C. Increasing temperature promoted elimination of arsenopyrite and reduction of As in medicinal minerals and the extraction solutions. But the effects of processing cycles at the same processing temperature were not clear. Heating temperature is more important than number of processing cycles for the removal of arsenic, and it is necessary to heat pyrite to over 650 o C to remove it.