Enrichment Characteristics Of Paragenitic And Associated Elements And Their Prospecting Signiifcance For Molybdenum Polymetallic Deposits In Luanchuan Ore Concentrated District

Luanchuan ore concentrated district is situated in the joint of North China Plate andYangtze Plate, which is an important part of East Qinling molybdenum metallogenicbelt. There are three super large molybdenum polymetallic deposits and a largemolybdenum deposit, which all fall into porphyry-skarn deposit. Meanwhile thisdistrict is one of the most important molybdenum occurring areas in China，so studyof the district is of great scientific value and economic significance.Luanchuan ore concentrated district is on a high study level in basic geology andgeology of deposit. Many experts and scholars establish united tectonic andstratigraphic frameworks by applying various geological theories and methods, whichprovides a reliable theoretical basis for gaining a correct view of metallogenicgeological condition. They also summarize the geological features of typical deposits,analyze space-time unity of mineralization and establish ore-hunting indicators,expound metallogenic mechanisms and summarize metallogenic regularities.Under the industrious study on geological information, this paper takesporphyry-skarn molybdenum polymetallic deposits in Nannihu orefield as keyresearch subject, summarizes enrichment characteristics of paragenitic and associatedelements in them by fields investigation and indoor observation. Firstly, throughcomparisons of tectonic setting, mineralization epoch, rock mass features, mineralizedfeatures, country rock condition, alteration zoning, the author summarized ore-bearingdifferences and major ore-controlling factors of typical porphyry-skarn deposit in thisdistrict, found country rock could make differences on deposit-type, associations ofmetallogenetic elements and mineralization intensity under the similar conditions oftectonic setting and parent rock. Secondly, through trace elementary analysis of rockand ore samples collected from typical deposits, the author found enrichmentcharacteristics of In-Sn-TFe₂O₃could be taken as ore guide of prospecting skarn andskarn-type oerbody. Meanwhile the author analyzed the relation of paragenitic andassociated elements enrichment and rock mass, different ore and country rock,identified the relation between paragenitic and associated elements enrichment andmajor metallogenetic element （Mo） and got indicator elements （Re, Mo） to set indexof geochemical exploration, which would be of great help in the future oreprospecting.