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(1) , 36, 4 , 257-268, 2003 Econ. Environ. Geol., 36(4), 257-268, 2003.   

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(4)    . . . . . Base-metal Mineralization in the Cretaceous Gyeongsang Basin and Its Genetic Implications, Korea: the Haman-Gunbug-Goseong(-Changwon) and the Euiseong Metallogenic Provinces Sang Yeol Lee1, Seon-Gyu Choi1*, Chil-Sup So1, In-Chang Ryu1, Soo-Meen Wee2 and Chul-Ho Heo1 1. Department of Earth and Environment Science, Korea University, Seoul 136-701, Korea Department of Earth and Environment Science, Korea National University Education, Cheangwon 363-791, Korea. 2. The Cretaceous magmatism in the Gyeongsang Basin, Korea, led to the formation of two contrasting metallogenic provinces: the Haman-Gunbug-Goseong(-Changwon) (HGGC) and the Euiseong (EU). The mineralization in the HGGC metallogenic province represents copper, gold and iron of porphyry-related deposits that display close relationships in time and space with subvolcanic granitoids. Much of copper-gold-forming events in this province are consistently constrained to the period between ca. 89 and 81 Ma. The hydrothermal systems of copper-gold vein deposits in the HGGC province are associated with ore-forming fluids of high to intermediate temperature (300~500oC) with high salinity (20~55 equiv. wt.% NaCl). The ore-forming fluids become progressively more diluted by the incorporation of decreased quantities of magmatic water further from the nearby intrusion, suggesting significant input and fluid mixing of a meteoric water component to the magmatic fluids during the late stage of geothermal systems. In contrast, the EU metallogenic province is characterized by polymetallic vein deposits that are consistently constrained to a period of 78~60 Ma. The geothermal systems of polymetallic vein deposits in the EU province are derived from a narrow range of intermediate temperature (200~400oC) with relatively low salinity (1~7 equiv. wt.% NaCl). It may represent a mixed fluid of magmatic and meteoric waters. The base-metal mineralization in the Gyeongsang Basin shows a close spatial and temporal distinction between the proximal environment derived from shallow-level granitoids in the southwestern HGGC province and the distal condition derived from volcanic environments in the northwestern EU province..   metallogenic province, Haman-Gunbug-Goseong(-Changwon), Euiseong, proximal type, transitional type, distal type.  

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(68). 0. 0(.   Cu-Au-Ag ternary diagrams showing regional variations of metallic ratio between the Euiseong, Changwon, HamanGunbug and Goseong metallogenic provinces..

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(86) >w3 *+ 'B  h`¯U + ¯ t % =°¯tk l;-X +m nJo. £Ë0 ~ .%%.  .  . .   Rose diagrams of vein lineaments in the Euiseong, Haman-Gunbug, Goseong and Changwon metallogenic provinces. Note the major lineament of the Haman-Gunbuk, Goseong and Changwon metallogenic provinces represent N-S direction, whereas the Euiseong metallogenic province show N40W direction..

(87)

(88) . Characteristics of gangue minerals from the representative base-metal deposits in the Euiseong, Changwon, Haman-Gunbug and Goseong metallogenic provinces. Mine. scp. Euiseong. Changwon. Haman-Gunbug. Goseong.   .   . .   . . tur. ank.         .   . . qtz.                           . amy. chl. ep. . . .  .                    .   . . ser.       . kln. rds. . sd. . .  .    .   . .  .    .   .   . cal.               . fl. .    .   .   .       .  *Frequency of occurrence (abundance); Abbreviations; act=actinolite, amy=amethyst, ank=ankerite, cal=calcite, chl=chlorite, ep=epidote, fl=fluorite, kln=kaolinite, qtz=qurtz, rds=rhodochrosite, sd=siderite, ser=sericite, scp=scapolite, tur=tourmaline. ..

(89)  Oxygen and hydrogen isotope composition of quartz and inclusion fluids from. Metallogenic provinces Northwestern Euiseong. Average S.D.*. the Haman-Gunbug-Goseong-Changwon and the Euiseong metallogenic provinces in southern Korea.. δDH2O(‰) in fluid inclusion. Range. N*. Average S.D.*. Range. N*. Calculated δ18OH2O(‰) ** Average S.D.*. Th(oC). Range. N*. Range. References. 6.1. 1.3. 4.4~7.9. 13. -75. 10.1. -9.7~-62. 9. -1.3. 1.9. -4.5~1.1. 13. 247~380. Lee and Kim, 1997; Lee et al., 1998. 11.8 6.9 5.6. 1.9 1.9 2.6. 9.3~15.9 2.5~10.9 -0.3~8.9. 18 16 12. -78 -76 -76. 6.0 8.2 6.9. -88~-68 -91~-59 -83~-62. 18 16 12. 5.5 0.1 -2.1. 3.1 2.7 3.6. 0.0~11.1 -5.9~5.0 -9.9~2.7. 18 16 12. 190~480 235~370 230~370. Choi, 1998; Heo et al., 2003 Choi et al., 1993 So et al., 1995; Choi et al., 1998. *S.D.=standard deviation; N=number of analyses. **δ18OH2O calculated from homogenization temperature of fluid inclusion data. . Southwestern Haman-Gunbug Goseong Changwon. δ O(‰) in vein quartz 18.      !"# $ %

(90) & ''. Dongil-Dongcheogogsan Gamgye Daeseong-Donghwa Donghwa Hwanghagsan Otto/Tohyeon Cheongsong Hwanghak Geumhak Guryong,Cheongryong, Daewon Woongnam, Majin Geoje Jeil GB main vein Jeil GB west vein Ogok Gilgok Daedong Manse Dundeok Namgok-Bukgok Taehwa Daejang(North) Daejang(South) Namseon Sambong, Seongji Samsan, Jinheung, Daedun Samjeon, Jeil. act.

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