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RISS 인기검색어
- 검색키워드
- 저자 : Pirajno, F. (검색결과 2 건)
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Lee, G.,Koh, S.M.,Pirajno, F. Elsevier 2014 Ore geology reviews Vol.61 No.-
The Haenam volcanic field was formed in the southern part of the Korean peninsula by the climactic igneous activity of the Late Cretaceous. The volcanic field hosts more than nine hydrothermal clay deposits and two epithermal Au-Ag deposits. This study focuses on the relationship between hydrothermal clay alteration and epithermal Au-Ag mineralization based on the geology, alteration mineralogy, geochronology, and mineralization characteristics. These clay and epithermal Au-Ag deposits are interpreted to have formed by the same hydrothermal event which produced two distinct types of mineral systems: 1) Au-dominant epithermal Au-Ag deposit and 2) clay-dominant hydrothermal clay deposit. The two types of mineral systems show a close genetic relationship as suggested by their temporal and spatial relationships. The Seongsan hydrothermal system progressively evolved from a low-intermediate sulfidation epithermal system with Au-Ag mineralization and phyllic alteration to an acid-sulfate high-sulfidation system with Au-Ag mineralization and/or barren advanced argillic/argillic alteration. The Seongsan system evolved during post volcanic hydrothermal activity for at least 10Ma in the Campanian stage of the late Cretaceous. The Seongsan hydrothermal system shows the rare and unique occurrence of superimposed high to low (intermediate) sulfidation episodes, which persisted for about 10Ma.
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Yildirim, N.,Donmez, C.,Kang, J.,Lee, I.,Pirajno, F.,Yildirim, E.,Gunay, K.,Seo, J.H.,Farquhar, J.,Chang, S.W. Elsevier 2016 Ore geology reviews Vol.79 No.-
The Ortaklar VMS deposit is hosted in the Kocali Complex consisting of basalts and deep sea pelagic sediments, which formed by rifting and continental break-up of the southern Neotethyan in Late Triassic. The basalts are of NMORB-type without notable crustal contamination. From the surface to depth, the Ortaklar deposit consists of a gossan zone, a thick massive ore zone and a poorly developed stockwork zone. Primary mineralisation is characterised by distinctive facies including sulphide breccias (proximal), graded beds (distal), stockworks and chimney fragments. Ore mineral abundances decrease in the order of pyrite, magnetite, chalcopyrite, and sphalerite. Two distinct phases of mineralisation, massive magnetite and massive sulphide, are present in the Ortaklar deposit. Textural evidence (e.g., magnetite replacing sulphides) and the spatial relationships with the host rocks indicate that magnetite and sulphide minerals were generated in different stages. The transition from sulphide to magnetite mineralisation is interpreted to relate to variation in H<SUB>2</SUB>S content of ore fluids. The 1st stage massive sulphide ore might have formed by early hydrothermal fluids rich in Fe and H<SUB>2</SUB>S. The 2nd stage massive magnetite might have formed by later neutral hydrothermal fluids rich in Fe but poor in H<SUB>2</SUB>S, replacing the pre-existing sulphide ore. The alteration patterns, mineral paragenesis, lithological features (massive ore-stockwork ore-gossan) of the Ortaklar deposit together with its trace elements, Cu-Pb-Zn-Au-Ag and REE signatures are all consistent with a Cyprus-type VMS system. The δ<SUP>34</SUP>S values in pyrite and chalcopyrite samples range from 2.6 to 5.7%%, indicating that the hydrothermal fluids were associated with sub-seafloor igneous activity, typical of Cyprus-type VMS deposits. However, magnetite formed later than sulphide minerals in the Ortaklar deposit, contrasting with typical Cyprus-type VMS deposits where magnetite generally occurs in lower sections. Consequently, although the Ortaklar deposit generally conforms to Cyprus-type deposits, it is distinguished from them by its late stage and high magnetite concentration. Thus, the Ortaklar deposit is thought to be an exceptional and perhaps unique Cyprus-type VMS deposit.
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