Study On The Geological Characteristics And Ore Genesis Of Pb Deposit In Zaida Area Of Morocco

In morocco,the moulouya basin is the main output of lead zinc mine which havebeen identified three kinds of mineralization types (A.Layered ore bodies occur inclay, marl and dolomite layer of Jurassic; B.vein orebody Hosted in metamorphicshale and granite;C.Layered ore bodies occurred in the Permian-Triassic sandstone).The ZAIDA deposit,belongs to the third genetic types, mainly occurred in redgritstone of the Triassic, the overburden strataison it is red siltstone andmudstone.The mainly minerals are galena and cerusite. From the occurrence ofdeposits and sedimentary features,combined with the internal relationship of rockmass, according to the classification of mineral deposit research results of domesticnew inference: belong to stratabound endogenous type deposit.In this paper are summed up, on the basis of the results of the predecessors, themineral geological survey, comprehensive analysis and comparison, the metallogenicmodel of this deposit of the comb, it is pointed out that similar deposits in this areaand the prospecting direction.Hercynian, Intermountain rift formationing, the basin began to deposit, formed byfluvial dominated by lacustrine sediments, the ore bearing hydrothermal fluids riseingalong the basement fault, undering strong hydrodynamic conditions, with the coarseclastic of basin edge to center of basin migration, accumulation rapidly. After furtherdevelopment of basin, sedimentary mode into the coastal facies, so that thehydrodynamic conditions weakened, the formation of the deposited layer with siltmud, the coarse clastic sediments of early formed isolation cover. the ore bearinghydrothermal growth in fissure of basement coarse rising and diffusing to clastic porediffusion which in the early, contributed to the early sedimentary layer liquid forfurther enrichment of middlings. Undering compaction huge, the ore fluid iscondensed and terrigenous clastic together diagenesis and mineralization.Later,hydrothermal of fissure in basement continue to infiltrate to consolidation or semiconsolidated clastic rocks, the formation of fine vein or banded ore body.In thelong-term erosion environment, cause the orebody directly exposed or in the nearsurface, undering strongly oxidation leaching effect, the formation of a large numberof secondary mineral--cerussite.Comprehensive analysis of metallogenic model of the deposit can be divided intofour stages: first, rapid deposition period; two, enrichment of ore-forming elements;three, diagenesis and mineralization stage; four, oxidation leaching stage.