광포만 집수유역내에 분포하는 점토광물의 성인에 관한 연구

박맹언 부산수산대학 해양과학연구소 1988 연구논문집-부산수산대학교 해양과학공동연구소 Vol.20 No.-

계명산층내 알칼리 화강암 기원의 Nb-Y 광화작용에 수반되는 퍼구소나이트의 지구화학 및 산출특성 연구

박맹언,김근수,최인식,Park, Maeng-Eon,Kim, Gun-Soo,Choi, In-Sik 대한자원환경지질학회 1997 자원환경지질 Vol.30 No.5

Some RE (Zr, Nb, REE) ore deposits are located in the middle part of the Korean peninsula. Geotectonically, the RE ore deposits situated on the Kyemyeongsan Formation of northern margin of the Okcheon geosynclinal belt and in the transitional zone between Kyeonggi massif and Okcheon belt. The rare metal deposits distributed in Kyemyeongsan Formation which consists of schist and alkaline granite. The alkali granite has suffered extensive post-magmatic metasomatism and hydrothermal processes. The ore contains mainly Ce-La, Ta-Nb, Y, Y-Nb, Ti-Nb-(U), Nd-Th group minerals. Fergusonite, one of Nb-Y rich REE minerals belonging to the A-B oxides, is most common mineral in the rare metal deposits. The fergusonite bearing rocks may be devided into four types by occurrence features and mineral association, that is, zircon type, allanite vein, feldspar type, and fluorite type. Fergusonites show wide variations in optical properties, due to part of differences in their chemical composition (depending on the types), but also the degree of crystalinity of the individual specimens. Fergusonite metamicts enclosed in biotite are generally surrounded by well developed pleochroic haloes. Usually, fergusonite is accompanied with zircon and other REE-bearing minerals. Petrographical and chemical data are presented for fergusonites which collected different types. $Nb_2O_3$ and $Y_2O_3$ contents range from 48.51 to 53.01 wt.% and 29.18 to 42.02 wt.% respectively. Also, $ThO_2$, (1.83~6.93), $UO_2$, (0.17~2.84), ${\sum}RE_2O_3$ (except to Y) (1.11~8.73), and $TiO_2$, (0.19~1.19 wt.%) contents show variational compositions according to fergusonite types. The ${\sum}RE_2O_3$ of fergusonites are positive relation with $Y_2O_3$ and negative relaton with $ThO_2$ and $({\sum}{RE_2O_3}-{Y_2O_3})$. The $Nb_2O_3$ is sightly negative relation with $Ta_2O_3$. Back-scattered electron microscope images (BEI) of fergusonite show the mineral composition and textural feature is very complicated. The variation of Nb, Th and REE content of fergusonite and the modes of occurrence of mineral, suggests that REE may have been mobilized during the circulation of hydrothermal fluids related to contact metamorphism (metasomatism). The chemical variation of the fergusonites with occurrences and mineral association can be related to metasomatism of alkaline fluid was probably the dominant ore-forming process in Chungju district.

경상분지 남부지역의 지열 부존 잠재력 평가를 위한 퍼지기반 자료통합의 적용성 연구

박맹언,백승균,성규열,Park, Maeng-Eon,Baek, Seung-Gyun,Sung, Kyu-Youl 대한자원환경지질학회 2007 자원환경지질 Vol.40 No.3

The occurrence of geothermal water has high correlates highly with fossil geothermal system. A fuzzy logic based data integration is applied for geothermal potential mapping in the Southern Gyeongsang Basin which is distributed in the regional fossil geothermal system. Several data sets are related with the origin and distribution of fossil geothermal system, such as the geological map, the density of lineaments, the aerial survey map of magnetic intensity, the map of hydrothermal alteration, the distribution density of hydrothermal mines, which were collected as thematic maps for the integration. Fuzzy membership functions for all thematic maps were compared to the locations of the spa hot springs, which were used as ground-truth control points. After integrating all thematic maps, the results of gamma operator (${\gamma}=0.1$) was showed the highest success rate, and new geothermal potential zone is prospected in some area.

광화유체의 비등과 희석에 의한 통영 천열수계 Au-Ag-Te 광화작용에 대한 반응경로 모델링

박맹언,성규열,Laurence P. James 대한자원환경지질학회 2001 자원환경지질 Vol.34 No.6

At the Tongyeong mine, quartz, ihodochrosite (kutnahorite), muscoyite, illite, pyrite, galena, chalcopyrite, sphalerite, acanthite, and hessite are the principal vein minerals. They were deposited under epithermal conditions in two stages. Ore mineral assemblages and associated gangue phases in stage can be clearly diyided into two general associations: an early cycle (band) that appeared with inooduction of most of the sulfides and electrum, and a later cycle in which base metaland carbonate-bearing assemblages (mostly rhodochrosite) became dominant. Tellurides and some electrum occur assmall rounded grains within subhedral-to euhedral pyrite or anhedral galena in stagell. Sulfide mineralization is zonedfrom pyrite to galena and sphalerite. W3 have used computer modeling to simulate formation of four stages of vein gen-esis. The reaction of a single fluid with andesite host rock at 280℃, isobaric cooling of a single fluid from 260℃ to 120℃, and boiling and mixing of a fluid with both decreasing pressure and temperature were studied using the CHILLER program. Calculations show that the precipitation of alteration minerals is due to fluid-andesite interaction as temperature drops. Speciation calculations confirm that the hydrothermal fluids with moderately high salinities and pH 5.7 (acid), werecapable of transporting significant quantities of base metals. The abundance of gold in fluid depends critically on the ratioof total base metals and iron to sulfide in the aqueous phase because gold is Oansported as an Au(HS)₂- complex, which is sensitive to sulfide activity. Modeling results for Tongyeong mineralization show soong influence of shallow hydro-genic processes such as boiling and fluid mixing. The Yariable banding in stagell mineralization is best explained by mul-tible boilings of hydrothermal fluid followed by lateral mixing of the fluid with overlying diluted, steam-heated ground water. The degree of similarity of calculated mineral assemblages and observed electrum composition and field relationships shows the utility of the numerical simulation method in identifying chemical processes that accompany boiling and mixing in Te-bearing Au-Ag system. This has been applied in models to narrow the search area for epithermal ores,.

가상체액성분에 대한 광물약의 반응 모델링 : 위액-주사반응과 수은착물의 농도

박맹언,김선옥 대한지질학회 1998 대한지질학회 학술대회 Vol.1998 No.

충주지역 희유원소광상에서 산출되는 갈렴석의 지구화학적특성

박맹언,김근수,최인식,Park, Maeng-Eon,Kim, Gun-Soo,Choi, In-Sik 대한자원환경지질학회 1996 자원환경지질 Vol.29 No.5

Rare metal (Nb-Zr-REE) ore deposits are located in the Chungju area. Geotectonically, the rare metal ore deposits are situated in the transitional zone between Kyeonggi massif and Okcheon belt. The rare metal deposits are distributed in Kyemyeongsan Formation which consist of schist and alkaline igneous rocks. Alkali granite has suffered extensive post-magmatic metasomatism and hydrothermal processes. The ore contains mainly Ce-La, Ta-Nb, Y, Y-Nd, Nd-Th group minerals. More than 15 RE and REE minerals are found in the ore deposits. Allanite, one of the Ce-La rich REE minerals belonging to the epidote group, is the most common mineral in the studied area. The allanite- bearing rocks may be devided into seven types by features of occurrence and mineral associations; zircon type (ZT), allanite-vein type (AT), feldspar type (KT), fluorite type (FT), quartz-mica type (QT), iron-oxide type (MT), and amphibole type (HT). The allanite veins (AT) and zircon rich rocks (ZT) contain the highest total REE contents. Differences in REE abundance can be interpreted in terms of varying portions of magmatic hydrothermal fluid. Petrographical and chemical data are presented for allanites which were collected from different types. The allanites show wide variations in optical properties, due in part to differences in their chemical composition (depending on the types) and to the degree of crystallinity of the individual specimens. Allanite metamicts in biotite are generally surrounded by well developed pleochroic haloes. Usually, allanite is accompanied by zircon and other REE-bearing minerals. CaO and total REE contents $({\sum}RE_2O_3)$ range from 9.29 to 18.79% and 11.66 to 26.31%, respectively. Also, SiO, (28.87~32.61%), $Al_2O_3$ (8.30~16.88%), and $Fc_2O_3$ (16.74~24.38%) contents show varying contents from type to type. The ${\sum}RE_2O_3$ of allanite has positive relationships with $Fe_2O_3$ and negative relaton with CaO, $SiO_2$, and $Al_2O_3$ Backscattered electron microscope images (BEl) of allanite shows that the its mineral composition and texture is very complex. The allanite-bearing hosts show distinct light REE enrichment with strong negative Eu anomaly except for HI. The HT has an almost flat REE distribution pattern with a small negative Eu anomaly. The chemical variation of the allanites with occurrences and mineral association can be related to condition of temperature and oxidation states in precipitation environment.

비소로 오염된 달천광산 토양의 자연저감 능력에 대한 pH-Eh영향

박맹언,성규열,이민희,이평구,김민철,Park Maeng-Eon,Sung Kyu-Youl,Lee Minhee,Lee Pyeong-Koo,Kim Min-Chul 대한자원환경지질학회 2005 자원환경지질 Vol.38 No.5

울산 달천광산의 지하수 및 토양 중에 함유되어 있는 비소의 오염현황을 파악하고, pH와 산화-환원 전위 값의 변화에 따른 자연저감 능력을 평가하였다. 달천광산 지역 비소 오염의 주 근원광물인 유비철석의 광미 내 함량은 최대 $2\%$이며, 비독사석, 니콜라이트, 램멜스버가이트, 거스도르파이트, 코발트석과 황철석 등의 비소함유광물 역시 비소오염의 근원이 되고 있으며, 비소함량은 광물에 따라 다양한 차이를 보인다 광미장 내 유비철석과 황철석의 표면이 부분적으로 철산화물과 철비산염으로 산화된 것을 관찰할 수 있어, 풍화반응이 상당히 진행되었음을 알 수 있다. 지하수 내 비소의 함량과 pH는 뚜렷한 상관관계를 보이지 않지만, 포화대 및 비포화대의 지하수의 비소 농도는 Eh가 감소함에 따라 농도가 감소하는 정(+)의 상관관계를 보인다. RMB(Red Mud Bauxite)는 비소제거 효율이 우수하여 달천광산 지역의 비소로 오염된 지하수 및 토양을 복원 시 자연저감 촉진제로 이용될 수 있을 것이다.

H/F Variation in Wolframites According to Depth and Temperature of Mineralizatio

박맹언 부경대학교 기초과학연구소 1993 기초과학연구논문집 Vol.4 No.-

가상체액에 대한 광물약의 반응 특성 모델링 ; 위액-주사 반응과 수은착물의 농도

박맹언 부경대학교 기초과학연구소 1999 부경대 기초과학연구논문집 Vol.2 No.-

Textural and Mineralogical Investigations on Deep Sea Manganese Nodules from the

박맹언 부산수산대학 해양과학연구소 1987 연구논문집-부산수산대학교 해양과학공동연구소 Vol.19 No.-