Genetic environment of the Yuryang Te-bearing Au deposit: Batholith-type orogenic Au mineralization in Korea

Pak, Sang Joon; Choi, Sung‐Gil; Oh, Chang Whan; Kim, Sung Won; Soo-Meen, Wee

doi:10.1007/3-540-27946-6_263

Cited by 2 publications

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“…However, research on goldsilver mineralization in the area has been limited mostly to studies of a few individual ore deposits (Heo et al, 2001;Pak et al, 2005;Shelton et al, 1988). In the present study, petzite has been recognized from the Yuryang gold deposit for the first time in Korea.…”

Section: Introductionmentioning

confidence: 52%

“…The deposits in the Cheonan area, including the Yuryang deposit, show common features, such as massive vein morphology, low Ag/Au ratios, simple mineralogy, weak alteration, an association with pegmatite dikes and Jurassic emplacement ages. However, research on goldsilver mineralization in the area has been limited mostly to studies of a few individual ore deposits (Heo et al, 2001;Pak et al, 2005;Shelton et al, 1988). In the present study, petzite has been recognized from the Yuryang gold deposit for the first time in Korea.…”

Section: Introductionmentioning

confidence: 52%

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Genetic Environment of the Intrusion‐related Yuryang Au‐Te Deposit in the Cheonan Metallogenic Province, Korea

Pak

Choi

et al. 2006

Resource Geology

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Abstract:The Yuryang gold deposit, comprising a Te-bearing Au-Ag vein mineralization, is located in the Cheonan area of the Republic of Korea. The deposit is hosted in Precambrian gneiss and closely related to pegmatite. The mineralized veins display massive quartz textures, with weak alteration adjacent to the veins. The ore mineralization is simple, with a low Ag/Au ratio of 1.5:1, due to the paucity of Ag-phases. Ore mineralization took place in two different mineral assemblages with paragenetic time; early Fe-sulfide mineralization and late Fe-sulfide and Au-Te mineralization. The early Fe-sulfide mineralization (pyrite + sphalerite) occurred typically along the vein margins, and the subsequent Au-Te mineralization is characterized by fracture fillings of galena, sphalerite, pyrrhotite, Te-bearing minerals (petzite, altaite, hessite and Bi-Te mineral) and electrum.Fluid inclusions characteristically contain CO 2 and can be classified into four types (Ia, Ib, IIa and IIb) according to the phase behavior. The pressure corrected temperatures (≥500°C) indicate that the deposit was formed at a distinctively high temperature from fluids with moderate to low salinity (<12 wt% equiv. NaCl) and CH 4 (1 ~ 22 mole %). The sphalerite geobarometry yield an estimated pressure about 3.5 ~ 2.1 kbar. The dominant ore-deposition mechanisms were CO 2 effervescence and concomitant H 2 S volatilization, which triggered sulfidation and gold mineralization. The measured and calculated isotopic compositions of fluids (δ 18 O H 2 O = 10.3 to 12.4 ‰; δD H 2 O = -52 to -77 ‰) may indicate that the gold deposition originated from S-type magmatic waters.The physicochemical conditions observed in the Yuryang gold deposit indicate that the Jurassic gold deposits in the Cheonan area, including the Yuryang gold deposit are compatible with deposition of the intrusion-related Au-Te veins from deeply sourced fluids generated by the late Jurassic Daebo magmatism.

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Section: Introductionmentioning

confidence: 52%

Section: Introductionmentioning

confidence: 52%