福建老鹰山矿区石墨矿床特征及成因

Geological characteristics and genesis of graphite deposit in Laoyingshan Mine in Fujian

福建老鹰山矿区石墨矿主要赋存于二叠系童子岩组一段(P1t1)地层中,属隐晶质石墨矿,其产状总体呈层状、似层状及透镜状分布。一层稳定可采,局部二层至三层可采,石墨矿固定碳含量较高,达到工业品位以上,矿石质量相对较好。区内花岗斑岩较发育,为煤层变质成为石墨矿提供了热液来源。经过分析认为,矿层为煤层受热液变质作用形成,其成因类型为接触变质型,应属于后期热液接触变质层控矿床。

The graphite deposit in Laoyingshan Mine was mainly occurred in the first part of Tongziyan Formation of Permian System （P1t1）. Its occurrence was of generally stratified, stratoid and lenticular distribution. And the first layer was stable and can be mined, and some of the second and third layers were can be mined too .The content of the fixed carbon in graphite mine was high above the industrial level, and the quality was relatively good. Granite-porphyry was developed in the area; it provided the hydrothermal source for the coal seam for turning into graphite mine. It was concluded that the seam was formed by hydrothermal metamorphism, and the genetic type should be the contact metamorphic type, belonged to a late contact metamorphic strata bound hydrothermal deposit.