The Comparation Research Of Ore Bearing Metamorphic Rock Series And It's Deep Exploration In Meixian Pb-Zn Ore Field,Central Region Of Fujian Province

Meixian Pd-zn Pb-Zn ore field locates in central Fujian continental rift,and the Pb-Zn orebody mainly hosted in middle-late proterozoic Mamianshan group Greenschist facies metamorphic rocks,Controlled by the stratigraphic and lithologic.The Orefield is divided into the east river side(represents of Dingjiashan mining area)and the west river side(represents of Fengyan mining area)by Youxi River.There are many difference between the west side and the east side,such as lithologic,layer division and Orebody Characteristics,that cause many difficulties in ore prospecting and Prediction.In previous work,Based on the analysis and research of Mamianshan metamorphic sequence and geochemical characteristic,we devided and comparison the metamorphic stratigraphic sequence:Meixian ore field late Proterzoic Mamianshan metamorphic rocks ranging from the old stratum Longbeixi group to the new stratum Donglongyan group.Longbeixi group is mainly consists of quartz-mica schist,quartz-feldspar schist,marble,quartzite series rocks,and other"light-colored schist" clip a small amount of thin "greenschist",based on the rock chemistry and REE characteristics,restoring the the original rock of Longxi group:calcium and magnesium,semi clay,pelitic sedimentary metamorphic rocks,as some small-scale basic rock-ultramafic magma intrusion.The Dongyan group only discoved in Dingjiashan mining area in the whole Meixian area,and it is conformable contact to the upper Dongyan group,so we can speculate that the ore-bearing rock series of Dingjiashan mine area is at the bottom of Dongyan group.Dongyan group consists of multiple sets of "light-colored schist"-"greenschist" lithological cycles."Colored schist" mainly mica schist,feldspar epidote quartz schist,marble,albite leptite etc.;"Greenschist" is the major ore-bearing horizons,that refers to the rocks which the main minerals are epidote,diopside,chlorite,actinolite,and other green minerals.According to the rock chemistry and REE characteristics,the original rock of Dongyan group exhibit mud calcareous sedimentary alternately and multiple basic-acidic volcanic intrusive.? Dingjiashan mine area currently expose the second lithologic layer of the group,it is a "Light-Green" metamorphic rocks cycle,and also the bottom of the Dongyan group;? Fengyan mine area currently expose the 4th lithologic layer of the group,including two sets of of "Light-Green" metamorphic rocks cycle,did not find the bottom of the group,but can corresponds to the 6th,5th,4th,3th layer of upper Dongyan group in Fengyan east mining area;?East Fengyan mine area currently expose the 6th lithologic layer of the group,including 3 "Light-Green" metamorphic rocks cycle,did not find the bottom of the group.Therefore,the study suggests that Dingjiashan mining area and Fengyan mining area is not the same metamorphic rocks layer,but its a ore-bearing layer underlying.so,We may find typical Dingjiashan type Pb-Zn deposit in the depth of the Fengyan mining area.