Geological Geochemical Characteristics And Geneticanalysis Of Laobing Magnetite Deposite, Xinjiang Province

Laobing magnetite ore deposit of Xinjiang province is one of the largest gypsum typemagnet deposit ore so far discovered in southern of Xinjiang, and is potential for prospecting.In this paper adequately collected and summarized on the basis of predecessors academicresearch results,we choose the magnetite ore deposit as the typical ore deposit. Through fieldgeological survey, stable isotope and main elements and trace element chemical analysis etc,this thesis mainly studied the regional tectonic evolution background, geologicalcharacteristics, metallogenic age, rock ore geochemical characteristics and source ofore-forming materials and so on, makes a primary study on the regional metallogenicregularity. The mainly conclusions results gained can be expressed as followings:1、 Laobing magnetite ore deposit located Taaxi-Tatulu ditch tectonic volcanicsedimentary basin, iron-rock seriesbasically zonal distributed along the tan oxidation; Thedeposit produced in different protolith formation,without specific formation.The magnetiteore deposit with Precambrian BIFs type iron ore deposit ArcheocoicAnshan type iron oredeposit, paleoproterozoic Aalizi type iron ore deposit, middle proterozoic Xuannong type ironore deposit and devonian ningxiang type iron deposit has significant differences.2、The main elements of iron ore deposit is mainly composed of T (Fe2O3) and SiO2,SiO2/Al2O3, that is similar to Marine volcanic-sedimentary type iron ore, different fromterrigenous sedimentary type iron ore; Obvious enrichment of Th, U, Hf, P, Gd, Er high fieldstrength elements（HFSE）, obvious loss of large ion lithophile Sr(LILE) and Zr, Ti, Nb, highfield strength elements（HFSE） and BIF iron ore enrichment significantly large ion lithophileelements, which distinguish the Sr/Ba, Ni, Co, Ni/zinc ratio similar to Marine volcanicsedimentary type iron ore; Different types of magnet and single mineral characteristics of rareearth elements(REE), the right light rare earth elements concentration.3、Mineral association of pyrite and anhydrite in δ34S are characterized by enrichmentheavy sulfur, that mainly comes from seawater sulfate reducing sulfur; Magnetite δ18Ocharacteristic is similar to Marine volcanic sedimentary type primary sedimentary magnetite(the eastern in Hebei Province), suggests that magnetite mainly for primary sedimentary formation.4、The deposit features similar to sea bottom jet Sedex type (SMS) and the VMS type ofcomparative study, the ore deposits in the tectonic setting, geological features, wall rockalteration, the prospecting marks, ore-controlling elements and ore rock show specialtransitional characteristics of massive sulfide deposits.5、Volcanic sedimentary basin formation arc basin of trap structure, provides theprecipitation of iron ore favorable sedimentary environment. Small heat convection inducedin back-arc region turbulence environment, ore-forming materials to the basin on the edge ofthe lagoon, tidal flat, high oxygen from the water migration, Eh value increased, make thebasin center of sulphate acid reducing agents the transition to on the edge of the offshoreoxidizing substances; The formation of mineral association reduce the concentration of sulfatein seawater, joining with terrigenous clastic material, The change of PH value, thus led topromote the magnetite deposit.Introducing magnet deposit of the gypsum-iron the type to us, not only deepened the ironore metallogenic theory, and also provides the technical route and direction.for the regionsearch and the exploration of large sedimentary metamorphic type iron ore and island arc beltpolymetallic mineral.