The Qianlishan - Qitianling Furong Tin Cassiterite The Causes Of Mineralogy And Fluid Inclusion Study

The paper uses new theories and methods of genetic mineralogy and prospecting mineralogy, and analyses geological background, ore forming conditions, geochemistry of mineral deposits, deposits formation theory and ore forming pattern of Shanmengkou, Goutouling, Maziping and Wuchangping of Furong orefield. With advanced testing techniques and methods, cassiterite in those orefields is researched. Author obtains new genetic mineralogy and prospecting mineralogy typomorphic characteristic and offer important evidence in cassiterite deposits genetic analysis and prospection for the area.Furong cassiterite deposits are mainly endobiose stannary , and exogenic stannary in small. The former include gasification-high temperature hydrothermal deposit and high-middle temperature hydrothermal deposit according to ore forming stage. Stannary of the area contain greisen type, skarn type, alteration rock mass type, structure alteration zone type, quartz vein type, porphyry type and impact type stannary according to ore forming geological environment, mode and alteration type.The paper analyses the cassiterite of Furong orefield in paragenetic association. Author do deep research on stannary forming type with the methods of EMP, XRD, EMS, IR, LRS etc from genetic mineralogy angle. The paper obtain typical typomorphic characteristic of crystal shape, physical properties, chemistry composites and trace elements, unit cell parameters, spectral diagnostics under all kinds of conditions of Furong orefield. Crystal shape observation shows that when temperature reduce, cassiterite grain change from massiveness aggregation type to fine quartz reef type, crystal form of cassiterite conical surface forming change to cylinder forming, ratio of length to width gradually largens. Trice elements characters of cassiterite shows that stannary of Goutouling, Wuchangping and Maziping belong to cassiterite sulfide combination type associable with batholith. Infrared spectrum research indicates that cassiterite infrared spectrum of Shanmenkou ore area at Furong orefield is spectrum of defects, deposit type belong to greisen type. Other ore area belong to distortion spectrum, and Goutouling stannary belongs to skarn type,othors are cassiterite sulphide hydrothermal deposits.Through the test about homogeneity temperature and salinity to inclosure of cassiterite and quartz and the research on oxygen isotope geochemistry character of quartz, we master parameters of temperature, salinity, density, ore-forming pressure ofthese hydrothermal ore-forming solution. At the ore-forming stage in Furong orefield hydrothermal ore-forming solution is mainly magma thermal fluid and ore-forming fluid take place boiling.