| The west part of Henan Province, is an important part of molybdenum ore belt in East Qinling Mountains. Nannihu molybdenum polymetallic ore field is located in Lengshui town, which is in the south of Luanchuan county, Luoyang city. Speaking of metallogenic belt, the ore field located in small Q inling Mountains and west henan metallogenic belt, which is in the southern margin of the North China block. This mine field is rich in Mo,W,Pb,Zn resources, which has great prospecting potential. There are three huge porphyry and skarn type molybdenum deposits in the mine field, whose names are Nannihu,Sandaozhuang and Shangfanggou. Trough study the research area, the geological and geochemical exploration model of Nannihu molybdenum mine field can be established, the metallogenic regularity of ore prospecting marks of porphyry and skarn type molybdenum deposit in this area can also be summed up, which are useful to guide the new ore body, expand the size of deposits, and even play an important guiding role to the work and actical layout of ore exploration evaluation prospecting strategy.This paper has collected geological data and data of regional rocks, altered rocks and ores, regional stream sediment geochemical data, large scale sediment geochemical data of Nannihu molybdenum mine field. Through study the geological and geochemical anomaly of the three huge ore deposits, this article has established geological and geochemical exploration model.Following understandings can be achieved :1、The ore bodies of the three huge porphyry and skarn type molybdenum deposits in Nannihu molybdenum polymetallic ore field are all at exposed state. Ore formation is composed with skarn and hornstone of Luanchuan group. Mineralization of this field has close relationship with Nannihu rock and Shangfanggou rock, which formed in Yanshan period. The structures whose directions are at north west and north east, controlled the intrusion of rocks which formd in Yanshan period and the distribution of ore deposits. The main ore types are skarn, porphyry, hornfels, skarn alteration, potassium, silicon are the main mode of wall-rock alteration.2、Compared with the average content of Chinese granite, Nannihu molybdenum mine field significantly enriched in C u,Zn,Nb,Ta,Th,U,Rb,Cr,Ga,Ge, etc, and their enrichment factors are all greater than 1.2;Rare earth elements relatively depleted. Compared with the content of Regional rock,The deposit primary halo significantly enriched in Sr,V,Cr,Co,N i,Zn,Ga,Ba,Pb,Sc, etc, and their enrichment factors are all greater than 1.19. The indicator elements of medium and large scale geochemical exploration are Mo, W, Pb, Zn, Au, Ag, Cu,As. and the enrichment factors of Pb,Mo,Ag,W,Zn are all greater than 5.0. compared with the average stream sediment, the indicator elements of regional geochemical exploration are Mo, W, Bi, C u, Pb, Zn, Cd, Au, Ag, F, Mn, P, V, As, Sb, Sn. and the enrichment factors of Pb, Cd, W, Ag, Bi, Zn, Mo are all greater than 2.5, compared with the average stream sediment. |
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