湘潭石潭海泡石粘土矿床特征及找矿方向

赋存于茅口组下部含泥质灰岩段的矿体呈似层状、透镜状，长3500－5600m，平均厚4.39-5.15m，矿石品位一般8%-20%，最高可达65％。矿石有原岩型和粘土型两类，粘土型矿石一般呈灰－深灰色，干燥后呈灰白色，硬度1－2，比重1.6-2.3t/m^3，粘性强，可塑性好，透水性强。主要矿物成分有海泡石、石英、方解石、滑石、蒙脱石、伊利石和氟磷石等,矿石富Si、Mg、贫K、Na,CaO、Al2O3含量偏高。早二叠世江南古陆两侧局限（浅）海或海湾环境有利于海泡石沉积。在永顺－石门、安化－浏阳、怀化－浏阳成矿带，具有良好的找矿前景，估计海泡石资源量在3000万吨以上。

CHARACTERISTICS OF SEPIOLITE CLAY DEPOSIT AT SHITANXIANGTAN AND ITS PROSPECTING DIRECTION

The deposit occurs in limestone sectionwhich contains peliticsat the lower part of Maokou Formation, with the deposit layer-shaped, lentiform, 3,500m to 5,600m long, average 4.39 to 5.15m thick, ore grade 8% to 20% Dingenerally, the highest 65%. There are two types, including protolish and clay. Clay ores generally assume gray to deep gray, and gray-white after dried, rigidity 1 to 2, specific gravity 1.6 to 2.3 t/m3, strong viscosity, fine plasticity, strong permeability. Sepiolite, quarz, calcite, talc, smectite, illite, fluor-apatite etc. are the main minerals with low K, Na and high Si, Mg, CaO, Al2O3. Two sides of ancient terra localized in shallow sea or bay favored deposit of sepilote. Metallogenic strip of Yongshun-Shimen, Anhua-Liuyang, Huaihua-Liuyang bears good prospecting foreground, estimated resource of sepiolite exceeds 30 million tons.