29 3 2010 9 GLOBAL GEOLOGY Vol. 29 No. 3 Sept. 2010 1004-5589 2010 03-0392 - 08 1 2 1 1. 130026 2. 116021 P618 P618. 51 A doi 10. 3969 /j. issn. 1004-5589. 2010. 03. 005 Geological characteristics and genesis of Huanggoushan and Banmiaozi gold deposits in Laoling metallogenic belt of southern Jilin LI Bao-yi 1 YANG Zhen-yu 2 WANG Yu-fen 3 1. College of Earth Sciences Jilin University Changchun 130026 China 2. Dalian Corporation No. 8 of Engineering Bureau of China Construction Dalian 116021 Liaoning China Abstract Through the comparison of geological characteristics of Huanggoushan and Banmiaozi gold deposits in Laoling metallogenic belt of southeastern Jilin the authors considered that Archen supracrustal rock and the Late Proterozoic Laoling Group are main source beds and the northeastern deep fault belt is the main ore-controlling structure while the distributions of gold orebody do not closely related to the magmatic rock in spatial. The gold deposit was formed in low-medium temperature hydrothermal environment combining with the analysis of geological conditions and material sources of mineralization. Deep fluid magmatic hydrothermal and meteoric water all joined in the mineralization dominated by meteoric water and formed the circulation mineralization system of meteoric water and deep hydrothermal. Laoling gold and polymetallic metallogenic belt has great metallogenic potential and favorable prospecting potential. The distributions of gold deposit were related to the unconformity on upper marble of Zhenzhumen Formation which related with large fault zones. Key words Laoling metallogenic belt geological characteristics gold deposit sourthern Jilin 1-7 2009-06-02 2010-05-12
3 393 1 1 8 TTG 1 S Fig. 1 1 3 Geological sketch map of southeastern Baishan in Jilin
394 29 2 0. 001 ~ 0. 005 mm 2. 1 S 1 41 911. 1 9-11 2 800 ~ 850 11 57 ~ 82 3 10 > 0. 11 mm < 0. 01 mm 0. 1 ~ 0. 3 mm 9 S 10 12 13 6 7 2 Fig. 2 Geological sketch map of Huanggoushan gold deposit 2. 2 1 3 F102 10 ~ 20 m SE 60 ~ 70
3 395 3 Fig. 3 Geological sketch map of Banmiaozi gold deposit 3 F100 14 0. 005 ~ 0. 001 mm > 800 15 3 3. 1 3 Au 0. 03 10-6 ~ 0. 3 10-6 10 ~ 100 4 Au 8 9 Au Au 5. 9 10-6 ~ 41. 6 10-6 41. 6 10-9 K = 23. 1 Au 2. 5 10-9 K = 1. 4 9
396 29 10-3 ~ + 8. 34 10-3 δd - δ 18 O 4 SiO 2-65% ~ 74% Na 2 O > 3. 2% 4% ± K 2 O /Na 2 O < 1 Al 2 O 3 / CaO + Na 2 O + K 2 O 0. 85 ~ 1. 1 10 δeu > 0. 7 Rb /S r 0. 15 ~ 0. 6 δ 18 O 8. 71 8. 739 87 Sr / 86 Sr 0. 706 18 δ O 9. 00 87 Sr / 86 Sr 0. 706 22 δ 18 O 9. 3 87 Sr / 86 Sr 0. 705 67 E Rb -Sr 215 10 6 a Rb -Sr 197 10 6 a 4 Fig. 4 H -O isotopic composition of Huanggoushan gold 4 deposit fluid Au 90 % 22 3. 2 δ 34 S 2. 05 10-3 ~ 31. 4 10-3 108 4 2 11. 6 10-3 3. 6 10-3 1. 12 10-3 4. 2 10-3 23 0. 28 10-2 ~ 4. 2 10-2 NaCl 1. 5 10-2 NaCl ph 5. 7 ~ 6. 2 δd - 76 10-3 ~ - 100 10-3 - 90 10-3 δd - 40 10-3 ~ - 80 10-3 - 20 10-3 ~ - 40 10-3 δ 18 O - 0. 28 22 23 23 -
3 397 F102 5 Au Au ph Au HS - Fig. 5 5 - Model graph of circulation mineralization by meteoric water and deep hydrothermal in Laoling metallogenic belt
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