33 2 2014 6 GLOBAL GEOLOGY Vol. 33 No. 2 Jun. 2014 1004 5589 2014 02 0426 07 : 1 2 2 2 2 2 3 3 4 5 1. 100083 2. 010020 3. 461000 4. 010020 5. 115 137400 曹四夭钼矿床位于华北地台北缘内蒙古台隆凉城断隆东部钼矿体主要赋存于曹四夭花岗斑岩 外接触带的集宁群黄土窑组浅粒岩 变粒岩中, 燕山期中酸性岩浆侵入活动与成矿关系密切初步估 算钼金属量为 176 万 t 笔者在分析曹四夭钼矿成矿地质背景 矿体地质特征 物化探异常特征等基 础上, 提出了该矿床成因为具 二元结构 的斑岩型钼矿床, 并进一步总结了找矿标志 : 曹四夭 ; 钼矿床 ; 地质特征 ; 找矿标志 ; 内蒙古 : P618. 65 : A doi: 10. 3969 /j. issn. 1004-5589. 2014. 02. 019 Geological characteristics and prospecting indicator of Caosiyao Mo deposit Inner Mongolia LIU Yong-hui 1 2 MA Run 2 CHEN Zhi-yong 2 GAN Yun-yan 2 HE Fei 2 LI Xiang-zi 3 QUAN Zhi-xin 3 ZHAO Qing-xu 4 A Mu-gu-leng 5 1. School of Earth Sciences and Resources China University of Geosciences Beijing 100083 China 2. Geological Exploration Fund Management Center of Inner Mongolia Autonomous Region Hohhot 010020 China 3. No. 2 Geological Exploration Institute of Henan Bureau of Geology and Mineral Resources Xuchang 461000 Henan China 4. Mining Rights Trading Center of Inner Mongolia Autonomous Region Hohhot 010020 China 5. No. 115 Geology and Mineral Exploration and Development Institute of Inner Mongolia Autonomous Region Ulanhot 137400 Inner Mongolia China Abstract Caosiyao Mo deposit was located in eastern Liangcheng fault uplift of Inner Mongolia platform uplift belonging to the northern margin of North China platform. The molybdenum ore bodies mainly occurred in leucoleptite and granulite of Huangtuyao Formation in Jining Group contacting the Caosiyao granite porphyry. The acidic magma intrusive activity in Yanshan period had close relationship with mineralization and the preliminary estimate of molybdenum metal amount was 1760 000 t. Based on the analysis of ore-forming geological background geological characteristics of ore body and the geophysical and geochemical anomalies of the Caosiyao Mo deposit the authors consider that the deposit had dual structure in type and further summarized the prospecting indicators. Key words Caosiyao molybdenum deposit geological characteristics prospecting indicator Inner Mongolia 2013-12-24 2014-04-03 09-1 -KC45.
2 427 0 1 50 000 2-1 176 t 0. 101% 2 2. 1 1 Ar 2 h 1 1 Fig. 1 1 Geological sketch map of Caosiyao Mo deposit
428 33 Mo W 2. 2 K 1 C 1 γπ CaO 0. 095% MgO 0. 4% K 2 O K 1 C 2 γπ 5. 8% Na 2 O 0. 52% 1 2 0. 06 km 2 ΣREE 231. 079 10-6 ΣCe /ΣY 12. 95 1 Table 1 Granite porphyry rock chemical composition and related parameters /% SiO 2 TiO 2 Al 2 O 3 Fe 2 O 3 FeO MnO MgO CaO Na 2 O K 2 O P 2 O 5 Vol A /CNK ALK AR DI SI σ 71. 83 0. 33 14. 18 3. 36 0. 12 0. 26 0. 4 0. 095 0. 52 5. 8 0. 074 2. 29 99. 31 1. 94 6. 32 2. 59 86. 2 4. 00 1. 36 76. 35 0. 092 12. 87 1. 68 0. 42 0. 16 0. 2 0. 08 0. 34 5. 44 0. 036 1. 52 99. 19 1. 95 5. 78 2. 61 89. 5 2. 50 1. 00 71. 63 0. 29 14. 00 1. 28 1. 75 0. 06 0. 88 1. 73 3. 62 4. 09 0. 09 0. 58 100 1. 03 7. 71 2. 07 Table 2 2 Content of rare earth elements and related parameters of Caosiyao spotted granite porphyry /ω 10-6 La Ce Pr Nd Sm Eu Gd Tb Dy Ho Er 53. 2 101 11. 2 40. 7 7. 11 1. 31 5. 52 0. 885 4. 32 0. 762 2. 20 Tm Yb Lu REE ΣCe /ΣY δeu La /Yb N Ce /Yb N Sm /Nd La /Sm 0. 337 2. 21 0. 325 231. 079 12. 95 0. 673 14. 293 9. 238 0. 175 7. 482 Herrmann 1971 22. SI 2. 47% 0. 02 km 2 Fe 2 O 3 / Fe 2 O 3 + FeO 0. 80 3 km 1 0. 5 ~ 1 ΣREE mm 122. 388 10-6 250 10-6 ΣCe /ΣY 7. 033 La /Sm 5. 26 SiO 2 76. 35% Sm /Nd 0. 225 ALK δeu 0. 224 5. 78 K 2 O /Na 2 O 16. 00 σ 2 1. 00 DI 89. 52%
2 429 U -Pb 131 ± 7 ρs Ma 2 133. 5 ± 7. 4 Ma 3 3. 1 2. 3 33. 62 ~ 390. 16 m 60. 56 m 1 994 m 2. 22 km 2 2 Mo 1. 13% 0. 107% ZK0800 0. 031% ZK2408 0. 075% 2. 4 3. 2 1 50 000 2-1 W Mo Bi Au Sn As 45 ~ 57 m 30 Sb 66 km 2 ~ 63 m 0. 033% ~ 0. 048% W Mo 80. 00 10-6 25. 20 10-6 Mo Sb -W As -Zn -Pb -Sb -As -Cu -Au W Ar 2 h Mo Mo 2. 5 1 1 1 612 m 912. 22 m 3 4 0. 08% 11 1 1 Fs > 2% 14. 75% Fs
430 33 Fig. 2 2 08 Profile of No. 08 exploration line of Caosiyao Mo deposit Table 3 3 Mineral composition and content of Caosiyao Mo deposit /% /% 0. 1 ~ 0. 2 20 ~ 57 3 ~ 55 5 ~ 50 3 ~ 15 5 ~ 20 8 ~ 23 4 Table 4 Chemical analysis results of ore w B /10-2 W Cu Pb Zn Bi Au /10-6 SiO 2 Al 2 O 3 Na 2 O K 2 O CaO MgO TiO 2 FeO Fe 2 O 3 67. 55 12. 34 2. 07 4. 04 3. 08 3. 90 0. 47 3. 53 4. 71 64. 39 15. 47 2. 54 5. 95 1. 53 1. 78 0. 65 2. 63 4. 29 P 2 O 5 MnO H 2 O Au S Cu Pb Zn Bi 0. 21 0. 10 0. 30 0. 06 0. 27 17. 40 12. 74 60. 15 0. 00 0. 31 0. 07 1. 05 0. 06 0. 97 28. 97 23. 86 35. 63 0. 13 3. 3
2 431 4. 2 4 4. 1 20 ~ 30 m 2 Mo Pb Zn Au Ag 3 F1 F2 F1 F2 4 F1 F2 Mo W Au Mo Sb -W As -Zn -Pb -Sb -As - F1 Cu -Au W Sb As W ZK0823 3 Fig. 3 1 W Mo Au 5 1 2 1. J. 2012 35 1 39-46. 3 LI Xiang-zi BAN Yi-hong QUAN Zhi-xin et al. Discuss on the molybdenum deposit geochemical Metallogenic model of Caosiyao Mo deposit characteristics and metallogenic model in Xinghe County Inner Mongolia J. Geological Survey and Research 2012 35 1 39-46. 2. Re-Os 3-8 J. 2013 59 1 175-181.
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