Geological And Geochemical Characteristics And Fluid Inclusion Research Of The Jinshandian Fe Deposit In Southeastern Hubei Province

Jinshandian deposit locate in southeastern Hubei, mainly produced in the contact zone between quartz monzonite and Triassic carbonate rocks. Jinshandian deposit is not only the typical of hydrothermal ore body, but also there are ore bodies with similar ore magma feature, high-grade, with surrounding rock boundaries completely, filled in rock fractures, mainly be controlled by fracture, most structure are banded and massive, and condensate side structure, vesicular structure, flow structure, and wall rock with visible faded edges, suggest that this kind of rich fluid with certain volatile, more sticky. Through the typical section in jinshandian, and study the trace elements, rare earth elements and fluid inclusions of main ore types.Massive ore and dense disseminated ore, with a large difference in the degree of elements. But the high field strength elements as Ta, Th, Nb with stable geochemical characteristics are relatively consistent, show that the original composition are basically the same. Which contents of large ion lithophile elements as Ba, Rb, show significant differences, disseminated ore more obvious metasomatic characteristics. Massive ore showed different characteristics, suggest that there are apparent genetic differences. Massive ore enriched LILE elements as Rb, U, La, Ce, Nd, Sm, loss HFSE as Ba, Ta, Nb, Sr, shows the relatively characteristics to quartz diorite, but quite different compare to the dense disseminated ores. Distribution patterns of rare earth elements of the massive ore show the obvious 8Eu negative anomaly, δCe not obvious negative anomaly, and the dense disseminated ores shows the δEu positive anomaly, δCe negative anomaly, show significantly different rare earth element distribution characteristics. Compared with ore magma type deposit in this area, shows that ore which in Jinshandian with magma characteristics may be magma origin.Jinshandian quartz diorite, massive ore have almost identical characteristics of tetrad effect, hydrothermal stage or earlier stage a lot cream mineral which containing salts added in the ore-forming fluids, led to the high Cl content added in ore-forming fluid, under the action between melt with rich Cl and containing volatile fluid, the rare earth elements bring in and out with the main elements, thus causing the REE tetrad effect features of the quartz diorite and the massive ore.Jinshandian deposit magnetite temperature burst test that from predecessors, showed this kind of ore-forming fluid temperature significantly higher than hydrothermal. The temperature of fluid inclusions results show that there are have the brine system in ore-forming fluids of Jinshandian, which with large differences in the salinity. The addition of high salinity brine system led to ore-forming fluids evolved from melt to the hydrothermal, in this transition phase which form a large number of magnetite that the ore body with the transition feature。Eventually form the hydrothermal fluid, and occurred metasomatism with wall rocks, formed ore body with the metasomatic feature。...