河南桐柏地区石墨矿地质特征与找矿方向

Geological Characteristics and Prospecting Direction of Graphite Deposits in Tongbai Area,Henan Province

研究区具有较好的石墨矿找矿前景,已圈定出大型石墨矿床1处,中型2处,小型1处。石墨矿体主要产出于古元古界秦岭岩群雁岭沟岩组中石英片岩(或片麻岩型)与大理岩接触部位,成因类型为区域沉积变质型,矿石类型以石英片岩型(或片麻岩型)为主,大理岩型为辅。石墨矿体厚度变化稳定,走向与区域主构造线走向一致,呈带状展布。综合研究表明,石墨矿体与赋矿地层受后期构造挤压作用呈复背斜特征产出,雁岭沟岩组分布区是今后重要找矿方向。采用合适的物探方法,有助于快速锁定找矿靶区。矿产勘查中,应根据石墨矿体所处背向斜褶皱形态,选择较为有利褶皱构造位置布设钻孔,可以起到事半功倍的找矿效果。

The research area has good prospects for graphite ore exploration,with 1 large graphite deposit,2 medium-sized deposits,and 1 small deposit delineated.The graphite ore body mainly occurs in the contact area between quartz schist(or gneiss type)and marble in the Yanlinggou formation of the Paleoproterozoic Qinling rock group.The genetic type is regional sedimentary metamorphic type,and the ore type is mainly quartz schist(or gneiss type),supplemented by marble type.The thickness of the graphite ore body varies steadily,and its strike is consistent with the main structural line of the region,with a banded distribution.Comprehensive research shows that the graphite ore body and the host strata are produced in a complex anticline pattern under the later tectonic compression,and the distribution area of the Yanlinggou formation is an important direction for future exploration.Adopting appropriate geophysical methods can help to quickly locate the prospecting target area.In mineral exploration,boreholes should be arranged at favorable fold structures based on the anticlinal fold morphology of the graphite ore body,which can achieve twice the result with half the effort.