Stable isotope, Fluid Inclusion and Mineralogical Studies of the Samkwang Gold-Silver Deposits, Republic of Korea
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(3) . . . . Stable isotope, Fluid Inclusion and Mineralogical Studies of the Samkwang Gold-Silver Deposits, Republic of Korea Bong Chul Yoo1*, Hyun Koo Lee1 and Seon Gyu Choi2 1. Department of geology, Chungnam National University Department of earth and environmental sciences, Korea University. 2. The Samkwang gold-silver deposits consist of gold-silver-bearing hydrothermal massive quartz veins which filled the fractures along fault shear (NE, NW) zones within Precambrian banded or granitic gneiss of Gyeonggi massif. Ore mineralization of this deposits occurred within a single stage of quartz vein which was formed by multiple episodes of fracturing and healing. Based on vein mineralogy and paragenesis, massive quartz veins are divided into two main paragenetic stages which are separated by a major faulting event. Main ore mineralization occurred at stage I. Wall-rock alteration from this deposits occur as mainly sericitization, chloritization, silicification and minor amounts of pyritization, carbonitization, propylitization and argillitization. Ore minerals are composed mainly of arsenopyrite (29.21~32.24 As atomic %), pyrite, sphalerite (6.45~13.82 FeS mole %), chalcopyrite, galena with minor amounts of pyrrhotite, marcasite, electrum (39.98~66.82 Au atomic %) and argentite. Systematic studies of fluid inclusions in early quartz veins and microcracks indicate two contrasting physical-chemical conditions : 1). temperature (215~345oC) and pressure (1296~2022 bar) event with H2O-CO2-CH4-NaCl fluids (0.8~6.3 wt. %) related to the early sulfide deposition, 2). temperature (203~441oC) and pressure (320 bar) event with H2O-NaCl CO2 fluids CO2 fluids represent fluids evolved (5.7 8.8 wt. %) related to the late sulfide and electrum assemblage. The H2O-NaCl through fluid unmixing of an H2O-CO2-CH4-NaCl fluids due to decreases in fluid pressure and influenced of deepcirculated meteoric waters possibly related to uplift and unloading of the mineralizing suites. Calculated sulfur isotope compositions (δ34Sfluid) of hydrothermal fluids (1.8 4.9 ) indicate that ore sulfur was derived from an igneous source. Measured and calculated oxygen and hydrogen isotope compositions (δ18OH2O, δD) of ore fluids (-5.9~ 10.9 , -102 -87 ) indicate that mesothermal auriferous fluids at Samkwang gold-silver deposits were likely mixtures of H2O-rich, isotopically less evolved meteoric water and magmatic fluids.. . . . . . . Samkwang gold-silver deposits, Ore mineralization, Fluid inclusion, Stable isotope..
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(81) . Chemical composition of arsenopyrites from the Samkwang mine.. Vein. Orebody. Sample No.. Weight % Ni Cd. Fe. As. Co. T22(4) T22(2) T22 T22 T22 Tongdong T22(2) T22(3) T3R27(3) T3R27(2) T3R27 T3R27. 35.86 36.27 35.99 36.09 36.13 36.48 36.02 35.82 35.69 35.74 36.10. 43.48 43.15 43.33 42.65 42.34 42.22 43.24 42.69 42.61 42.93 42.29. 0.03 0.01 0.05 0.04 0.04 0.05 0.05 0.04 0.06 0.03 0.04. 0.01 0.02 0.01 0.00 0.00 0.01 0.00 0.00 0.05 0.03 0.00. Bonsahang5(2) Bonsahang5(2) Bonsahang5(2) Bonhang Bonsahang5 Bonsahang5 Bonsahang5. 35.38 35.27 35.69 35.81 35.45 35.94. 43.69 43.61 43.16 42.64 43.01 41.63. 0.04 0.06 0.03 0.05 0.12 0.04. A2E-15(2) A3E125CH41(4) A3E125CH41 Guksabong A3W-19(11) A3W-19 A3W-19(2) A3W-19. 35.12 36.18 35.36 35.69 35.78 35.49 35.95. 44.67 41.57 43.94 42.79 43.07 43.24 42.53. Sangban. A7E25CR(5) A7E25CR(2) A7E80CR(5) A8E10CR(4). 35.07 34.79 34.39 34.72. Gukseong. Gukseong(2) Gukseong(2) Gukseong Gukseong(2). 34.82 35.14 35.81 35.79. Main. Atomic % Fe As. Associated Mineral. S. Total. 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00. 20.81 20.83 20.78 21.33 21.21 21.80 20.97 21.45 21.42 20.88 21.41. 100.19 100.27 100.16 100.11 99.72 100.54 100.28 100.00 99.82 99.61 99.84. 34.30 34.62 34.43 34.35 34.52 34.42 34.36 34.10 34.03 34.31 34.40. 30.99 30.71 30.89 30.26 30.15 29.70 30.75 30.29 30.29 30.72 30.03. Py,Sp Py,Sp Py,Sp Py,Sp Py,Sp Py,Sp Py,Sp Sp,Cp Sp,Cp Sp,Cp Sp,Cp. 0.02 0.01 0.01 0.02 0.15 0.01. 0.01 0.01 0.01 0.00 0.00 0.00. 20.65 99.78 34.03 20.85 99.79 33.86 21.24 100.13 34.02 21.48 100.00 34.08 21.43 100.16 33.73 21.25 98.87 34.55. 31.32 31.21 30.67 30.25 30.51 29.83. Qz,El Qz Qz Qz Qz Qz. 0.42 0.29 0.55 0.29 0.08 0.27 0.20. 0.17 0.11 0.06 0.31 0.38 0.12 0.30. 0.04 0.16 -. 20.62 22.12 20.80 21.40 20.98 21.08 20.75. 33.48 34.10 33.70 33.83 34.12 33.86 34.48. 31.74 29.21 31.22 30.23 30.61 30.75 30.40. Py,Sp,Cp Py,Sp Py,Sp Sp,Cp,El Sp,Cp Sp,Cp Sp,Cp. 44.03 44.65 44.65 43.84. 0.33 0.22 0.28 0.25. 0.16 0.20 0.08 0.22. 0.04 0.23 0.07 -. 20.76 100.39 33.55 20.46 100.55 33.38 20.19 99.66 33.32 21.42 100.45 33.02. 31.40 31.93 32.24 31.08. Sp Sp Sp,Gn Sp. 44.42 42.22 43.98 42.65. 0.13 0.11 0.20. 0.20 0.48 0.33 0.22. 0.01 0.07. 20.59 100.16 33.45 21.35 99.31 33.67 20.44 100.56 34.26 21.03 99.96 34.20. 31.80 30.15 31.37 30.38. Py,Sp,Cp Py,Sp,Cp Sp,Cp Sp,Cp. 101.00 100.31 100.71 100.64 100.29 100.20 99.73. Py; pyrite, Sp; sphalerite, Cp; chalcopyrite, Gn; galena, El; electrum, Qz; quartz. Value in parentheses is the number of analysis.. 69 §j yy. % y ¶ @ ³.!W ¹ER Þº9 9 §j 7Qô¶ ,Ú³ 72³ W ; Z ½ÁE ÙR6 º ? o ¬ ( }</ ¹E% c( ¶ @ ³!W ¹E 7Qô¶ ,Ú³!W ¹ ' ¹j 6i ¶ @ ³ ±6 ¦6 äºt fäºt89 º µ º º Þº @ º § è, R D , ½Á+6 °s$!W Þº ¼ ¬ + - +- . (&. 6. 9 +- + -. 9 + - +- . + -. 9 * + . 3. . "&. . . d ¨R û µº Þº9 5$d ¸ N L û !%& § ¹ER û º º § ¹ER ûw ½Á+6 º c( ¶ @ ³!W µº 6< ¹ ' ¹j ¦% ? o C ! ¹+6 º äºt fäºt @ ºt! W è, R D, :9 º § ¹EB- ³9 ¯¡!W c£9 U: µä § ºt³9 ¯ ! êÀ$r | 9 =ɶ ¹+6 °s$!W µº Þº @ º9 5$d ¸ NL û º § . -. . . . . 3. .
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(87) . . Chemical composition of sphalerites from the Samkwang mine. Zn. Fe. Cd. Weight % Mn Cu. T22(4) T22(4) T22(6) Tongdong T22(3) T3R27(2) T3R27(2) T3R27. 59.16 59.95 60.25 59.36 59.14 59.80 58.29. 6.76 6.67 6.59 7.26 4.35 4.09 4.65. 0.47 0.45 0.44 0.46 0.44 0.49 0.49. 0.01 0.00 0.01 0.00 0.00 0.01 0.00. 0.01 0.00 0.01 0.27 2.82 2.49 3.12. 0.00 0.00 0.00 0.00 0.00 0.00 0.00. 32.82 99.22 11.74 0.41 Asp,Py 32.91 99.98 11.47 0.39 Asp,Py 32.85 100.15 11.30 0.38 Asp,Py 32.89 100.25 12.42 0.39 Asp,Py 32.94 99.68 7.55 0.38 Asp,Cp 32.92 99.78 7.10 0.42 Asp,Cp 33.13 99.68 8.10 0.42 Asp,Cp. A2E-15(3) A2E-15(2) A3E125CH41(5) Guksabong A3E125CH41(4) A3W-19(4) A3W-19(4). 56.96 57.22 57.65 57.88 60.76 61.55. 6.47 6.36 6.77 6.90 3.97 3.67. 2.14 2.18 1.55 1.50 1.19 1.19. 0.02 0.01 0.03 0.02 0.01. -. 0.07 0.05 0.04 0.02 0.13. 34.17 33.61 34.10 33.81 34.23 33.79. 99.76 99.44 100.13 100.16 100.19 100.34. 11.51 11.29 11.92 12.08 7.03 6.45. 1.89 1.92 1.36 1.30 1.05 1.04. Asp,Py,Cp Asp,Py,Cp Asp,Py Asp,Py Asp,Cp Asp,Cp. Sangban. A5E210/2(4) A5W125-175(3) A7E25CR(3) A7E25CR(2) A7E80CR(2) A7E80CR(2) A8E10CR(3). 57.92 58.45 59.93 58.62 58.77 55.39 62.19. 6.50 6.99 5.27 6.42 5.75 7.80 4.73. 1.97 2.11 2.16 2.07 2.11 2.66 0.22. 0.05 0.02 0.05 0.08 0.02. -. 0.03 0.06 0.01 0.02 0.08 0.05. 33.32 32.69 32.29 33.04 33.79 34.23 33.52. 99.79 100.32 99.71 100.17 100.58 100.08 100.73. 11.40 12.05 9.15 11.16 10.07 13.82 8.15. 1.72 1.81 1.86 1.79 1.84 2.34 0.19. Py,Cp,Gn Py,Cp,Gn Asp Asp Asp,Gn Asp,Gn Asp. Gukseong. Gukseong(3) Gukseong. 59.42 5.08 60.81 4.29. 1.94 2.10. 0.09 0.04. -. 0.03 -. 32.74 99.30 32.77 100.01. Vein. Orebody. Main. Sample No.. Sn. S. Mole % Associated FeS CdS Mineral. Total. 8.93 1.69 Asp,Py,Cp 7.48 1.82 Asp,Py,Cp. Asp; arsenopyrite, Py; pyrite, Cp; chalcopyrite, Gn; galena. Value in parentheses is the number of analysis.. ¹ER û !%& @ º § ¹ER û w ½Á+6 !%& ? o9 ! º º PA½} ¨ ¹+6 °s$!W µº @ Þº9 5$d ¸ NL û º @ º § ¹ER ûw ½Á+6 !%&9 ?¬2d > $ ) oà l ! $ ?:ºd !oL
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관련 문서
Key words : Jinwon gold-silver deposit, quartz vein, wallrock alteration, mineralogy, geochemistry 진원 금-은 광상은 경상북도 울진군 북면 사계리에 위치한다..
Combined the result of fluid inclusion study with the fineness data (752 to 778) by electron microprobe analysis of placer gold grains, it is assumed that the primary gold deposit as
The results of fluid inclusion data indicate that the ore deposit was formed at a distinctively high temperature from fluids with moderate to low salinity (< 12 wt. The
