GEOLOGICAL CHARACTERISTICS AND RESOURCE POTENTIAL OF GRAPHITE DEPOSITS IN MADAGASCAR
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摘要:
马达加斯加石墨矿产主要产于太古宙-古元古代沉积变质地层中.全岛划分3条石墨成矿带，贯穿马达加斯加南北，矿化带最大规模长达200 km，宽度5000 m.石墨矿体呈层状、似层状、条带状，近南北向展布，产状稳定.矿体规模不等，最大矿体长度6100 m，宽度327 m，深度延伸大于1000 m.固定碳品位2.66%~9.02%.马达加斯加石墨矿分布广泛，石墨矿床规模多为大中型或超大型，品位高，粒度大.石墨几乎全部为大片晶质石墨，资源潜力广阔.晶质石墨资源量大于2×108 t.
Abstract:The graphite minerals of Madagascar are mainly produced in the Archean-Paleoproterozoic sedimentary metamorphic strata. The whole island is divided into 3 graphite metallogenic belts, stretching from north to south, with the largest mineralized zone of 200 km long and 5000 m wide. The graphite orebodies appear in stratified, stratoid and banded shapes, spreading nearly in N-S with stable occurrence. The orebodies vary in size, with a maximum length of 6100 m, width of 327 m, and depth extension more than 1000 m. The grade of fixed carbon is 2.66%-9.02%. The graphite deposits in Madagascar are widely distributed, mostly super-large or medium-large scaled, with high grade and large grain size. Almost all of them are large crystalline graphites, which has vast resource potential. The resource amount of crystalline graphites is more than 200 Mt.
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表 1 Toamasina石山石墨矿钻孔矿层及品位统计表
Table 1. Statistics for ore-bearing bed and grade in boreholes of Toamasina graphite deposit
钻孔
编号终孔
深度/m矿层
编号矿层位置/m 石墨含量/% 碳含量/% 总矿层
厚度/mA1 40.10 1 2~12 2.82~5.45 55.2~78.4 20 2 20~30 3.03~5.35 53.0~90.0 A2 25.10 1 6.7~14 4.24 81.6~86.8 13.3 2 16~22 3.53~6.86 83.8~92.0 A4 32.00 1 0~4.2 2.85~3.46 90.0~91.2 22 2 11.5~29.3 1.81~7.47 71.0~87.0 A5 19.80 1 0~3.6 2.82~4.84 77.8~84.2 12.9 2 3.6~10 1.21~4.54 76.0~85.8 3 12.7~15.6 1.71~2.32 86.2~90.6 A6 26.35 1 0~4.7 8.46~10.50 64.4~64.6 18.65 2 7.2~14.7 7.67~11.81 60.6~71.4 3 18~26.35 2.22~6.06 67.8~77.8 
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