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Helium ( 3 He/ 4 He), argon ( 40 Ar/ 36 Ar) and oxygen ( 18 O/ 16 O) isotopic ratios in fluid inclusions trapped in quartz and pyrite from the Sunshin epithermal gold-silver ore deposits in South Korea were analyzed to investigate the magmatic contribution to ore forming fluids. Mantle helium with high 3 He/ 4 He ratios (up to 3 ...
We report analyses of noble gases and Nd–Sr isotopes in mineral separates and whole rocks of late Pleistocene (<0.2 Ma) monzonites from Ulleungdo, South Korea, a volcanic island within the back arc basin of the Japan island arc. A Rb–Sr mineral isochron age for the monzonites is 0.12±0.01 Ma. K–Ar biotite ages from the same samples gave relatively concordant ages of 0.19±0.01and 0.22±0.01 Ma. ...
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