34 1 2015 3 GLOBAL GEOLOGY Vol. 34 No. 1 Mar. 2015 1004 5589 2015 01 0120 07 1 1 1 2 1. 066001 2. 130061 - - Kolaka - - - P618. 63 A doi 10. 3969 /j. issn. 1004-5589. 2015. 01. 014 Geological characteristics and genesis of gravel lateritic nickel deposit in Sulawesi Indonesia CHENG Li-qun 1 LIU Jian-bo 1 REN Xue-yi 1 WU Guo-xue 2 1. Qinhuangdao Mineral Resource and Hydrogeology Brigade Hebei Geological Prospecting Bureau Qinhuangdao 066001 Hebei China 2. College of Earth Sciences Jilin University Changchun 130061 China Abstract Laterite nickel ore is produced by basic and ultrabasic rocks after weathering-leaching-deposition and enrichment in tropical and subtropical areas with high temperatures and rainy weather throughout the year. Basic and ultrabasic rocks are considered to be mineraliing mother rocks for rocks of this type. Therefore looking for basic and ultrabasic rocks is the primary task to explore for laterite nickel ore in the past time. A new type of laterite nickel ore was discovered recently in Kolaka County of Sulawesi province Indonesia. The ore-forming mother rocks are not basic or ultrabasic rocks but a set of conglomerates consisting of dominated ultrabasic gravel. Gravel lateritic nickel deposit was named to distinguish from traditional laterite nickel ore resulted from basic and ultrabasic rocks after weathering and leaching. The structure of the deposit can be divided in descending order into humus layer laterite layer strongly weathered conglomerate layer semi-weathered conglomerates and conglomerates. The nickel ore body is mainly distributed in the semi-weathered conglomerate layer. It is preliminarily considered that the ore deposit was made from conglomerate after weathering-hydrolysis-leaching-sedimentary and enrichment. Key words Gravel lateritic nickel deposit geological characteristics genesis Indonesia 2014-07-07 2015-01-16 1962-. E-mail wuguoxue@ 163. com
1 121 0 1. 6 t 13-30% 70% 1 2 2 65% 3 20 2. 1 Kolaka 600 m 240 m 1 1 - - 30-4 5 6 1970 2% 12 1. 2. 3. 4. 5. 6. 0. 9% ~ 1. 1% 7. 1 Kolaka Fig. 1 Geological map of gravel lateritic nickel deposit 7 in Kolaka Sulawesi 12% 20 80 20 2005 8-10 11
122 34 Kolaka 95% 2. 2 - - 2 Kolaka 2 1 Kolaka 1. 5 m 0. 34% ~ 0. 66% 0. 48% 24. 73% ~ 42. 85% 37. 11% 1 1 Table 1 ω% Chemical analysis of each layer Ni Co TFe MgO SiO 2 CaO 0. 48 0. 07 37. 11 14. 26 15. 20 0. 50 0. 58 0. 08 37. 38 14. 37 15. 27 0. 58 0. 76 0. 07 28. 36 15. 02 24. 20 0. 95 1. 47 0. 03 13. 04 16. 89 41. 56 1. 26 0. 37 0. 03 7. 85 22. 57 43. 07 1. 59 Fig. 2 Zonation of gravel lateritic nickel deposit in 1 ~ 3 m 0. 40% ~ 0. 91% 0. 58% 23. 55% ~ 45. 71% 37. 38% 2 0. 5 ~
1 123 2. 4 Kolaka 141 0. 50 Ni Fe MgO SiO 2 CaO Co ~ 3 m 0. 50% ~ 1. 26% R 3 0. 76% 10. 23% ~ 39. 03% 4 28. 36% > 0. 70% Ni Fe Co SiO 2 CaO Ni SiO 2 2. 0% Ni 2. 0% CaO 1. 5% Ni 1. 5% MgO 1. 03% ~ 2. 12% 1. 52% Ni Ni 9. 37% ~ 36. 85% 17. 18% MgO 0. 50 ~ 7 m 3 5 ~ 20 cm 1 30 cm 95% Fe Co Ni 2. 3 3 R Fig. 3 R cluster analysis of gravel lateritic nickel deposit 3 12 3. 1 1 ω% 1 5 6
124 34 Fig. 4 4 Relation schema of chemical component and Ni in Gravel lateritic nickel deposit 5 6 Fig. 5 Conglomerate consist of dominated ultramafic gravel Fig. 6 Compound conglomerate of unformed nickel deposit 2 13 Kolaka 4 25 ~ 27 > 2 000 mm 13 3
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