Rock, Ore Microscopy Group Structural Characteristics On The Instructions Of The Origin Of Shuiyindong Gold

The Shuiyindong gold deposit,discovered in recent years,is located in the east of Huijiabao Au,Hg,Tl mineralizeation trend and exhibits comparatively large scale and high grade typical for most Carlin-type gold deposits,in southwestern Guizhou province.The deposit is hosted in the coal measures strata in the upper Permian Longtan Formation and the carbonaceous silicalite above the subjacent limestone of Permian Maokou Formation,which composed of a number of orebody,multiple ledge overlapped vertical space from top to bottom,the orebodies locate the high point of geological structure.The single orebody is stratiform,atoid structure,lentoid, lenticular,existed in strata,its occurrence is consistent with the adjacent rock.Studies the genesis of Shuiyindong gold deposit,which is helpful in the summary mineralization geological condition and the prospecting direction,and provides the basic data to prospecting of the same type gold deposit in the area,which has the vital economic significance and the theory significance.This paper is divided seven chapters,first makes synopsis to the regional geology and the gold deposit geological feature.Next key research the micro fabric of stone and ore,and discuss the forming process of deposit,and built the model of ore-formation of Shuiyindong gold deposit. Finally,making preliminary analysis and discussion to prospecting prospect in the area.The breakthrough point of this paper is the research of the micro fabric of stone and ore.The author has gathered more than 150 samples,these samples picks from ZK810,ZK802⁺¹ borehole, auxiliary research borehole and produces saps.First systematically make the research of the micro fabric of stone and ore.Next auxiliary research the geochemistry characteristic of stone and ore. Simultaneously,the author has gathered the electron probe material researched by predecessor.We discuss the mineralization geological condition of he Shuiyindong gold deposit through above material,having make the following progress.(1) Shuiyindong gold deposit is composed of a number of orebody.The single orebody is stratiform,atoid structure,lentoid,lenticular,existed in strata.The thickness of single orebody is 0.47～2.50m,variation factor of thickness is 47～118%,grade of orebody is 4.55～13.5×10^-6, variation factor of grade is 51.45～64%.(2) The carbonaceous silicalite which controlledⅠ^# orebody is sedimentary rock,and the impure carbonatite which controlledⅡ^#,Ⅲ^# and other orebody is sedimentary rock.The silicalite with the gold mineralization related is colloid SiO₂—aging—chalcedony—self-engendered quartz.Which shows the genesis of sediment—diagenesis.(3) The host stone of Shuiyindong gold deposit is the impure carbonatite,which contains richly biodetritus and basalt debris.The host stone is intricate carbonatite band of ingredient in Longtan Formation.(4) The silicalite which exists above the subjacent limestone of Permian Maokou Formation is the genesis of cascade sediment.(5) The gold ores have reborn margin fabric,intragranular porosity fabric,mould porosity fabric, emborder biological mineralization fabric,mouldic biological mineralization fabric,which reflects the fabric of sediment—diagenesis.(6) Depositional environment of Longtan Formation is frequent alternant lagoon—tide flat—carbonate platform,the conclusion is reflected through sulfur isotopic,petrochemistry constituent, trace element assemble,eigen element(Sc,TiO₂),pair of element ratio(Sr/Ba,Th/U),rare earth element.The gold ore matter come from strata.(7) The Shuiyindong gold deposit produces in the carbonaceous silicalite strata and Longtan Formation.The depositional environment of Longtan Formation is lagoon—tide flat—carbonate platform.Emei mountains basalt ejected continually in the west of the deposit,which forms the gold high background value strata.(8) Mineralization liquor contained richly gold which come from diagenesis of sedimentary rock is abundant.(9) Gold in the sedimentary rock located the place of the fossil groundwater evacuation.(10) The Suiyindong gold deposit have enough mineralization material,enough energy,excretion condition,localized mineralization space,because of the innate condition,the deposit can become to superhuge deposit.(11) Built preliminarily the model of ore-formation of Shuiyindong gold deposit.(12) Have put forward the gold concentrated the high point of geological structure, synsedimentary fault,orogenic geothermal belt and ancient burial hill.So we should research palaeohydrogeology unit,and supply-runoff-region of outflow of the single palaeohydrogeology unit,multipurpose use geology-geophysical prospecting-remote sensing to discover another Shuiyindong gold deposit.