| The last four tree-black copper mine area is located in the Huili of the Kunyang rift valley.Also in the north and south to river fracture,Pudu fracture and east-west Baojiu fracture,Matang fracture in the breaking of Dongchuan graben basin of Dongchuan taphrogenic trough.In metallogenic belt of Dongchuan mine field due to Luoyin iron copper ore concentration area.the last four tree-black copper mine is a copper deposit of containing ledge with Luoxue group dolomite.This article through to the last four tree-black copper mine in the ore-forming geological background,mining area,ore bodies,ore characteristics,formation geochemistry,petrography and so on has carried on the detailed study,and got the following key knowledge and results:1.Identifying the basic geological features of the last four tree-black copper beds:?The hosting ledge are in the section of the falling Luoxue Group the ore rock is dolomite,and the surrounding rock of the ore body is dolomite;?Ore body is mainly a layered,stratified,lenticular output,orebody occurrence are almost consistent with the occurrence of surrounding rock,ore body and wall rock basic clear boundaries;?Metal minerals are mainly pyrite,chalcopyrite,bornite,gangue minerals are mainly dolomite;?Ore texture and structure:the structure is given priority to with irregular fine granular aggregate structure;Followed by half since the form,it form fine crystal structure;Structure is mainly for web vein,spot,spot mixed layer,striate,scattered disseminated,porphyritic times for the fine vein and party;?Copper mineralization and closely related to pyritization,fade alteration.2.According to field observations and petrography,The last four tree-black copper mine area on copper mineralization period can be divided into sedimentary rock-metallogenic period and transformation period,the mineralization period not further divided metallogenic stage.3.To determine the controlling factors of The last four tree-black copper mine area:?The Luoyin sea basin and its As Luoxue in period of carbonate platform in the paleogeographic controlling;?Luoxue group's period of strata controlling;?Copper mineralization nectar sandy dolomite,siliceous dolomite,and argillaceous dolomite and algal dolomite color alteration common control;?Part of the copper mineralization by interlayer fissure,micro deformation zone and wear layer cracks and other secondary tectonic control.4.Puts forward the four tree-black woods copper deposit in the genetic type belongs to the "syngenetic sedimentary-later reconstruction" copper deposits,ore-forming model can be simply described as follows:from the early formation of Fe?Cu element by continual hydrolysis,migration,sedimentation and the pore in the formation of ore solution,with the steady accumulation of sedimentary process,under the effect of gravity,the original attachment in pore water and ore solution by continuous discharge,and upward migration,near the interface of oxidation-reduction(especially the yellow fade with nearby)and advantageous position,enrichment;Later in the regional power and tectonic effect under the action of pressure and heat,the heated ore-bearing hot along the liquid mass along the fault or fracture penetration,cycle,or local rich integration of fellowship with bedded ore vein ore,or local sedimentary rock formed orebody is further enriched.5.The formation of the mineral deposits,the formation of the minerals and the rules of the formation and control of the mineral deposits are summarized.To propose direct and indirect prospecting signs. |
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