무극금은광상의 열수계 진화

DC Field Value Language
dc.contributor.author 박상준 -
dc.contributor.author 최선규 -
dc.date.accessioned 2020-07-16T23:31:21Z -
dc.date.available 2020-07-16T23:31:21Z -
dc.date.created 2020-02-11 -
dc.date.issued 2009-04-01 -
dc.identifier.uri https://sciwatch.kiost.ac.kr/handle/2020.kiost/29587 -
dc.description.abstract The gold-silver deposit around the Eumseong pull-apart basin in the Precambrian Gyeonggi massif, Korea shows a genetic relationship between two left-lateral sinistral strike-slip fault systems. The wing cracks on a tensile domain in the jog structure are formed by the movement of NNE-trending major faults, suggesting that fault margins are favorable environments for the formation of veins. The Au-Ag-Sb veins in the Mugeug area are the results of multistage mineralization showing well-developed structures such as crustiforms, drusy cavities, combs, breccias, feathery lattice and cockades, consistent with textures commonly found in shallow-level environments. The veins show spatially variable envelopes of sericitic, argillic, propylitic and silicic alteration. Alteration patterns of veins are characterized by a wide, proximal, sericite-dominated phyllic zone, and a distal chlorite or/and epidote-dominant propylitic zone. Vertical variation of the alteration zone in the northern vein system is from a wide phyllic zone at depth, to a subphyllic zone at relatively shallow levels. Our results show that ore-forming fluids (δ18OH2O; -1.2 ~ 3.8 ‰) in the northern area evolved by dilution and cooling from less-evolved meteoric water at high temperature and salinity (≈ 300℃, 1~9 eq. wt. % NaCl). In contrast, vertical alteration patterns in the southern area change from a narrow subphyllic/propylitic zone at depth to a propylitic/argillic zone at relatively shallow levels. Compared to the northern area, this finding suggests that the circulating ore-forming fluids (δ18OH2O; -5.5 ~ 4.0 ‰) at low temperature and salinity (< 230 ℃, < 3 eq. wt. % NaCl) evolved by compositional variation of meteoric fluids. These changes in alteration assemblages and mineralization between the northern and southern area can be accounted for by the variation of current systems in a paleogeothermal field. -
dc.description.uri 1 -
dc.language English -
dc.publisher Geofluid VI -
dc.relation.isPartOf Journal of geochemical exploration -
dc.title 무극금은광상의 열수계 진화 -
dc.title.alternative Evolution of the Mugeug gold-silver vein system in Korea -
dc.type Conference -
dc.citation.conferencePlace US -
dc.citation.endPage 78 -
dc.citation.startPage 78 -
dc.citation.title Journal of geochemical exploration -
dc.contributor.alternativeName 박상준 -
dc.identifier.bibliographicCitation Journal of geochemical exploration, pp.78 -
dc.description.journalClass 1 -
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Marine Resources Research Division > Global Ocean Research Center > 2. Conference Papers
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