内蒙古东升庙多金属硫铁矿床深部断层泥XRD分析及其意义

XRD study on deep-seated fault gouge in Dongsheng-miao polymetallic pyrite deposit,Inner Mongolia

采用X射线衍射技术测试分析了东升庙多金属硫铁矿矿床深部断裂中的粉末状断层泥,物相检索结果表明断层泥中含有来源于矿体中的黄铁矿、闪锌矿、磁黄铁矿、黄铅钒、铜盐、黄砷硫银矿等金属矿物,石英、方解石、石膏、白云石以及金云母等矿物的出现反映了矿床的围岩性质。断层泥中矿物晶体的XRD衍射峰的分布特征能够反映出矿物的结晶程度,其与深部断层的活动相互对应,断层活动剧烈导致了断层泥中矿物结晶程度较高,反之亦然。此外,通过谢乐公式,选取谱图中较强峰的半宽高(β)和半衍射角(θ)估算了断层泥中矿物微粒晶体的平均大小,结果显示断层泥中多数矿物晶体粒径都分布在纳米级范围的,结合地气理论的原理,认为这些矿物微粒可以被地球内部上升气流携带至地表,能为矿床的研究以及找矿提供相应的依据。

Using the X‐ray diffraction to analyse the fault gouge from the fault in deep of DongSheng‐miao polymetallic pyrite deposit .The phase results show that the pyrite ,sphalerite ,pyrrhotite ,kusuite , nantokite and some xanthoconite are contained in fault gouge .Then minerals such as quartz ,calcite ,gypsum , dolomite and phlogopite reflect some properties of the surrounding rock .In addition ,the distribution of XRD diffraction peak from mineral crystals can indicate the mineral crystallization degree ,which corresponding with the activities of deep‐seated faults .A fierce activity in fault would lead to a higher degree of mineral crystallization ,and vice versa .Furthermore ,according to the Scherrer＆#39;s formula ,we estimated the average size of mineral particles each sample by selecting the FWHM （β） and the diffraction angle （θ） in strong peaks .The results show that the size distribution of most mineral crystals in fault gouge is nanoscale . Combining with the geogas theories ,thought that such nano‐sized mineral particles can be carried to the surface by the ascending gas flow from interior of the earth .Moreover ,it can provide some basis for study of deposit and prospecting .