34 4 2015 12 GLOBAL GEOLOGY Vol. 34 No. 4 Dec. 2015 1004-5589 2015 04-0951 - 10 1 1 2 2 2 2 2 1. 810600 2. 130061 NW 3 Ⅰ. Ⅱ. - Ⅲ. 200 ~ 240 170 ~ 210 130 ~ 160 24. 39 MPa 17. 30 MPa 11. 84 MPa 2. 4 km 1. 7 km 1. 2 km P618. 51 P575. 9 A doi 10. 3969 /j. issn. 1004-5589. 2015. 04. 007 Evolution characteristics of fluid and genesis of Qinglonggou gold deposit in Qinghai WEI Zhan-hao 1 DU Sheng-peng 1 WANG Jian 2 ZHANG Yan-jun 2 ZHANG Yu-ting 2 CHEN Chang-xin 2 BAI Yi-na 2 1. The First Exploration Institute of Geology and Mineral Resources in Qinghai Province Haidong 810600 Qinghai China 2. College of Earth Sciences Jilin University Changchun 130061 China Abstract Qinglonggou gold deposit is located in the northern margin of Qaidam Basin and sourthern Qilian o- rogenic belt. The deposit is controlled by northwest trending layer slip fault of Qinglonggou anticline fold and belongs to altered rock type of ore. According to mineral combination and interspersed relationship the mineralization process could be divided into three stages non-ore quartz veins stage stage Ⅰ quartz - pyrite sulphides stage stage Ⅱ and quartz carbonate stage stageⅢ. Petrographic and microthermometric study of fluid inclusions indicate that the fluid inclusions of different stages in quartz are mainly gas-liquid two-phase inclusions and appear pure liquid in the quartz carbonate stage. The homogenization temperatures are successively concentrated in 200 ~ 240 170 ~ 210 and 130 ~ 160 correspondingly ore-forming pressure are 24. 39 MPa 17. 30 MPa and 11. 84 MPa while ore-forming depth are 2. 4 km 1. 7 km and 1. 2 km during the mineralization stages Ⅰ Ⅱ Ⅲ. On the basis of fluid features and the geological characteristics the Qinglonggou gold deposit is defined as an epizonal orogenic in genetic type. Key words fluid inclusion orogenic gold deposit Qinglonggou Qinghai 2015-05-27 2015-10-30.
952 34 0 200 km 1 1995 1 2 1 1a - - Qh pal - O - St a - a O - St b b Pt 2 w a - Pt 2 w b - 2 - Mb - - γ b 3 - γ - δ b 3 - δ - b 3 - NW -SE Ⅱ - 2 -. - 1 a b 1 Fig. 1 Tectonic sketch of studied area a and geological map of Qinglonggou mine area b NW 2 1b 1 2 II -2 NNW 2 Fig. 2 Structure diagram of II -2 ore body in Qinglonggou gold deposit ES
4 953 3 NE II -1 SE NNW 3 EW NNW NE 60 ~ 79 2 3 II -2 10. 22 g /t Fig. 3 Geological section map of II -2 ore body in Qin- glonggou gold deposit 19 Ⅱ - 3 325 NE 70 m 11 m 6. 6 m 9. 4 g /t II -2 < 1m 1 ~ 4 g /t 7. 5 m 8. 2 g /t II -3 3 SN E 100 ~ 190 m 1. 5 - NW 4a 4b 3 I 4c II 323 I 5 II 4d 4a 4b 4c 4e II II -1 II -2 II -3 4f 323 2009 3 Ⅰ > 1 km
954 34 Au Sb Zn Co Ni Ⅲ 2 Au Cu Zn Co Ni Au Cu Zn Co Ni SPSS 22 Au Co Ni 1 a. b. c.. d. e. f Py. Qtz. Cal. Chl. Ep.. Fig. 4 4 Microphotographs of ore minerals and gangue minerals in Qinglonggou gold deposit Table 1 1 Primary halos correlation analysis results of ore in Qinglonggou gold deposit Au Ag As Sb Hg Cu Pb Zn Bi Co Ni Au 1. 00 Ag 0. 02 1. 00 As 0. 29 0. 02 1. 00 Sb 0. 48 0. 24 0. 57 1. 00 Hg 0. 37 0. 54 0. 42 0. 81 1. 00 Cu 0. 37 0. 00 0. 06-0. 11-0. 12 1. 00 Pb 0. 32 0. 34 0. 18 0. 71 0. 69-0. 03 1. 00 Zn 0. 48 0. 13-0. 10-0. 15-0. 17 0. 79 0. 10 1. 00 Bi 0. 14 0. 31 0. 29 0. 56 0. 45 0. 17 0. 50 0. 07 1. 00 Co 0. 49 0. 25-0. 04-0. 07-0. 07 0. 69 0. 13 0. 95 0. 06 1. 00 Ni 0. 48 0. 22-0. 04-0. 09-0. 10 0. 72 0. 09 0. 96 0. 05 1. 00 1. 00
4 955 Table 2 2 Primary halos factor analysis results of ore in Qinglonggou gold deposit F1 F2 F3 Au 0. 68 0. 22-0. 43 Ag 0. 33 0. 36 0. 73 As 0. 18 0. 53-0. 58 Sb 0. 28 0. 90-0. 20 Hg 0. 26 0. 88 0. 12 Cu 0. 74-0. 36-0. 17 Pb 0. 39 0. 70 0. 21 Zn 0. 88-0. 43 0. 03 Bi 0. 34 0. 58 0. 13 Co 0. 90-0. 35 0. 09 Ni 0. 90-0. 38 0. 07 3 6 3 3. 1 8 ~ 14 μm 20% ~ 50% 11-13. 2 ~ - 5. 6 200. 6 ~ 245. 3 200 ~ 0. 25 mm 240 8. 67 ~ 17. 19 wt% NaCl - - 0. 898 ~ 0. 996 g /cm 3 - Linkam THMS600 4 ~ 12-196 ~ + 600 μm 10% ~ 30% - 120 ~ - 70 ± 0. 2 100 ~ - 8. 3 ~ - 0. 8 165. 3 ~ 500 ± 2 H 2 O 219. 4 170 ~ 210 25% H 2 O -NaCl 1. 39 ~ 12. 07 wt% NaCl 0. 2 ~ 5 min - 1 0. 872 ~ 0. 953 g /cm 3-0. 2 min - 1 Potter 3 S = 0. 00 + 1. 78Ti - 0. 044 2Ti 2 + 0. 000 557Ti 3 Ti - 4 4 ~ 10 μm 10% ~ 20% 3. 2-4. 6 ~ - 0. 8 113. 5 ~ 159. 9 130 ~ 160 5 1. 56 ~ 7. 30 wt% NaCl 0. 948 ~ NaCl -H 2 O 0. 986 g /cm 3
956 34 Table 3 3 Temperature measurement results of fluid inclusions in different ore-forming stages in Qinglonggou gold deposit /μm /% / / /wt% NaCl Ⅰ /g cm - 3 8 ~ 14 20 ~ 50-13. 2 ~ - 5. 6 200. 6 ~ 245. 3 8. 67 ~ 17. 19 0. 898 ~ 0. 996 Ⅱ Ⅲ 4 ~ 12 10 ~ 30-8. 3 ~ - 0. 8 165. 3 ~ 219. 4 1. 39 ~ 12. 7 0. 872 ~ 0. 953 4 ~ 10 10 ~ 20-4. 6 ~ - 0. 8 113. 5 ~ 159. 9 1. 56 ~ 7. 30 0. 948 ~ 0. 986 a b. c d. - e f. -. Fig. 5 5 Microphotographs of various types of fluid inclusions of Jinlonggou gold deposit
4 957 a. b. c. - d. - e. - f. -. Fig. 6 6 Histograms of homogenization temperature and salinities of Qinglonggou gold deposit
958 34 4 5 17. 30 MPa 11. 84 MPa 1. 7 km 1. 2 km 24. 39 MPa - 17. 30 MPa - 11. 84 MPa 6-7 < 40 MPa 6 10 MPa /km 2. 4 km 1. 7 km 1. 2 km 170 ~ 210 130 ~ 160 2 ~ 5 wt% NaCl CO 2 7-9 10 11 600 km 30 km Sm -Nd 780 ± 22M a Rb -Sr 780 ± 22 Ma Sm -Nd 521 ± 14 Ma Rb -Sr 518 ± 11 Ma 12 496. 3 ± 6. 2 Ma 542 ± 13 6 Ma 7 Fig. 7 Fluid pressure distribution in fault zone 13-16 5 17 U - Pb 494. 6 Ma Ar -Ar 466. 7 ± 1. 2 Ma - 50% - 400 Ma 200 ~ 240 11 ~ 13 wt% NaCl 24. 39 MPa 2. 4 km - - NW 10% ± NW
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