关键词: 铅锌矿 地质特征 成因机制

Abstract: Nanchang Leadzinc Deposit is located in northern section of Mesozoic SimaoLanping depression,which has complicated tectonic framework and superior metallogenic condition.Based on the field geological survey of Nanchang leadzinc Mine and the analysis of its metallogenic geological background,geological characteristics,metallogenic mechanism and ore genesis,it is found that the orebodies are mainly occurred as lenticular in Yunlong Formation of Tertiary (Eyb) and Jingxing Formation of Lower Cretaceous (K1j1),and the Lower Yunlong Formation (Eya) is an efficient shielding layer in deposit.Besides that,the faint fadealteration occur at contact position between strata and surrounding rock.The Nanchang leadzinc deposit developed sandstonetype ore,limestonetype ore and oxidized ore,which has obvious sedimentary structure,and the ore has hydrothermal and metamorphic alteration characteristics in some areas.The strata and tectonic in mining area are proved to be the main factors in the formation of the deposit.The orebearing structure and oretransmitting structure are faults.The high salinity hotbrine has enriched in favorable stratigraphic horizon and tectonic,which migrated along the oretransmitting structure.The results show that Nanchang deposit is a multiple genesisstrata bound type leadzinc deposit which is related to hot brine.

Key words: Leadzinc deposit,Geological characteristics,Genetic mechanism