The Polymetallic Metallogenic Series And Exploration Model In The Southeast Of Inner Mongolia

The southeaste of Inner Mongolia is one of important chinese ore-concentration areaof copper polymetallic deposit. In spite of its long research history and a good basefor research, the following main problems still ramain.First of all, the mineralizationprocess of some deposits is complex and the genesis of ore deposits is need to be sure;The second,the deep structure of ore-controlling is not clear;The third，differentMetallogenic Series resource potential is not very clear.With the deeper analysysing of the typical deposits,we Preliminary ascertain that allkinds of deposits are the product of tectonic magma active zone and the results ofcombined effect of basment activation and melting regeneration and Superpositionreconstruction。Different deposit Series is controlled by different tectonic environment,and corresponds with Hercynian-Indochina period mineralization and Yanshanianperiod mineralization，The later mineralization have inheritanced the former，but it ismore Superposition reconstruction it。Regarding Cenozoic magmatic hydrothermalmetallogenic series as the final mineralization in this area, the most metallogenicpotentials.Concrete understanding and the results are as follows:(1) According to the new results of regional geology survey, there is much morePrecambrian base in the area, old basement formation reactivation in themineralization process, provides ore-forming substances, such as the mine ofBairedaba，the Baoyintu formation of lower proterozoic provid some lead source;(2) Two important periods of the paleoasian ocean period and theintracontinentalorogeny period。Late Paleozoic accretion orogeny belt and Yanshanianextensional tectonics-magmatic active beltsare formed;(3) Magmatic rocks spread along the major regional tectonic, and late variscan granitebelt distributes along the both limb of the Huang Gang-WuLanHaoTe anticlinorium，and the diagenetic age of magamatic rocks are gradually younger from north west tosouth east；Yanshanian period is the peak period of magmatic activity in this area, can be divided into early and late yanshanian magmatite;(4) Magmatic hydrothermal mineralization are mainly formed in tectonic-magmaticactive belt of compressive orogenic collision to extensional deformation of transitionperiod,and the linxi molybdenum metallogenic belt and other polymetallicmetallogenic belt are in it，the representative deposit of it is AoLun tinea phophrymolybdenum deposit;(5) With analysissing the typical ore deposits, summarizing the threemetallogenic subseries: the vein hydrothermal copper polymetallic depositmetallogenic subsystem, porphyry, porphyry molybdenum polymetallic metallogenicsubsystem, skarn type iron polymetallic metallogenic subsystem;(6) Isotope geochemistry also suggests that the source of ore-forming material ismultiple sources, such as Baiyinnuoer lead source is mix lead, with high value of Wand the Th/U ratios,it is maybe the results of mixed lead of mantle lead and the earlyPaleozoic, Mesozoic activation migration during the period;(7) Expounds the basal ore-controlling characteristics and metallogenic process is theresult of combined action of basement activation, remelting, regeneration andsuperposed and rebuiltprocess.Such as the Chaobuleng polymetallic deposit，its Cu,Mo, mineral resources is from hypomagma, Pb and Zinc from activating formation.AoLunHua isotope tracer suggests that there may be activation of remelting of thebasement;(8) Summarizes the regional metallogenic regularity, make surethat in the space-timeevolution characteristics of the metallogenic series; Prospecting model is established,highly summarized the regional metallogenic prediction evaluation model in the studyarea, and preliminary evaluation of regional mineral resources potential, and givethree regional prospecting area.The paper summarizes the main stratigraphic unit in the area of this work, tectonicand mineralization related to the distribution features of the magmatic rocks,summarized copper polymetallic deposit in this area, space-time evolutioncharacteristics, and divides the types of the metallogenic subseries; Is a combination of geophysical and geochemical anomaly model in the study area; Regionalprospecting model is established; Established ore-prospecting criteria andore-prospecting direction, and put forward some prospecting area.