| Aersitai magnetite located Nalati suture zone. Mining exposed strata are mainly the Lower Carboniferous Akshak group and the Silurian Bayinbuluke group, both in fault contact. Bayinbuluke group lithology is mainly tuffaceous sandstones, silicified tuffaceous sandstone, limestone, constructed mainly in the northern mining Nalati northern edge, extending along the northern slope of Mount Nalati almost EW.Magmatic rocks in the mining area in the late Permian granitic porphyry, a small rock-like strain output. Metamorphism is mainly mine gas- liquid deterioration is relatively common, the emergence of local and regional contact metamorphism dynamic metamorphism. The host strata are Silurian Bayinbuluke group, ore strata obviously in contact with the top wall rock bottom integration. The main ore is massive, vein-like, disseminated structure, ore minerals are magnetite, hematite, a small amount of pyrite, chalcopyrite; gangue minerals are mainly quartz, calcite.Study phase through rock found in the electron microscope ejection phase of magnetite have broken structure reflects the eruption of the unstable environment,there are very complete Form; plate-like hematite complete and incomplete crystalline polymorph directional needle, banded structure, reflecting the overflow environment;limonite magnetite filled in around with interspersed relationship; displays a characteristic mineralization with multi-stage, multi-stage. He pyrite form a solid solution to the illusion of endless belt located inside magnetite, magnetite and pyrite reflecting each other accountable, and the result is thermal fluid activity disturbance,often with students in marine sediments action stage.By ore geochemical analysis, major elements characteristic of magnetite show,Mn O, Mg O is low, Al2O3 content 0-0.064%, with an average of 0.028% and the content is very low, according to Xu Guofeng, Shao Jie Lian(1979) for magnetite standard type and characteristics of meaningful research, Aersitai is not a typicalmagnetite magnetite classification, the same ore body mined samples cast in FIG whole Lim(1982) on the causes of magnetite the triangle, the discovery data point spread; all the magnetite sample ΣREE(excluding Y) between 158.56 × 10-6 ~ 161.34× 10-6, a mean of 160.34 × 10-6, ΣLREE / ΣHREE at 3.06 ~ 3.12 between mean 3.10,it can be seen ΣLREE compared ΣHREE enrichment and differentiation is more significant, Ce has a strong negative anomaly indicates that the deposit had been present in the seabed of the marine environment; magnetite trace element analysis tests Co / Ni ratio of approximately 0.5, in accordance with YE Qing(1982) study of the characteristics and causes of typomorphic significance of magnetite inferred genesis of the deposit in favor of sedimentary-metamorphic; analysis of ore pyrite electronic probe, pyrite Co content 1.202-1.813%, with an average of 1.505%; Ni content of 0.051-0.191%, with an average of 0.142%, Co / Ni value of 10.59,according to Xu Guofeng(1980), Wang Kuiren(1989) study, which show Reasons close sedimentary and volcanic hydrothermal presumed Al Tolstoy magnetite SEDEX type deposits.Comprehensive features Aersitai magnetite deposits, and the comparative results of a typical jet stream bed sedimentary magnetite iron ore Funchal gauze that Aersitai magnetite deposit genetic type jet sedimentary. |
PDF Full Text Request