Fe-Ti Oxides Geochemistry Characteristics Of Weiya Vanadium-bearing Titanomagnetite Deposit And Xiangshanxi Cu-Ni-Ti-Fe Composite Deposit In Eastern Tianshan,Xiangjiang,China

Titanium iron oxide is one of the most widely distributed of the upper crust,most magnetic minerals belong to the Fe-Ti-O system minerals such as magnetite.They are most sensitive to changes in the chemical and thermal environment,and ilmenite oxides constituting the deposit.Both Weiya Fe-Ti-V deposit and Xiangshanxi Cu-Ni-Fe-Ti-V deposit while the role of mantle-derived magma are belongs to the East Tianshan Mountains magmatic ilmenite oxide deposit.Such deposits are mainly ilmenite oxide magnetite,ilmenite.For magmatic oxide deposits,domestic system for ilmenite oxide mineralogy East Tianshan Mountain area magmatic oxide deposits,geochemistry is relatively weak.For the study,we use the Weiya and Xiangshanxi vanadium-titanium magnetite deposits of ilmenite oxides(magnetite and ilmenite)as the research object.And its mineralogical and geochemical characteristics to the causes of such titanium metallogenic mechanism of iron oxide deposits were discussed.The study is supported by the State Natural Science Foundation Project ’Eastern Xinjiang Permian mantle derived mineralization magmatic deposit composite/transition type research’(No.41372102),the National Basic Research Program of China(973 Program)’Ancient arc basin system metallogenic regularity and large metallogenic prediction’(No.2014CB440803)and the China Geological Survey geological survey project:’Old Mines Typical Metallogenic Regularity Summarize Research’ and’Crisis Mining Exploration Theories,Methods and Technical Summary’(No.12120113086300)project,undertaked by Beijing Institute of Geology for Mineral Resources.Based on the filed investigation and microscope observation,the work focus on geochemistry of Weiya and Xiangshanxi vanadium-titanium magnetite deposits in Xinjiang,including geochemistry of magnetite and mineralogical studies major and trace element geochemistry and well integrated comparative analysis to study the geological characteristics typical deposit,mineralization and ore-forming mechanism.The mainly made the following main results:(1)Exsolution structure of magnetite in Weiya and Xiangshanxi deposits containing vanadium and titanium vanadium titanium magnetite made a systematic study.Among them,the tail and the unique sub deposit of magnetite and ilmenite deposits in Hong Shanxi lamellar composite with students due to sub-spar-rich ilmenite solvus oxidation.Magnetite-ilmenite spar dissolution appearance shows that titanium-rich magnetite-ilmenite ilmenite spar solid solution is much more than the melting temperature of the solid solution depleted in titanium lower.Spar ilmenite under high temperature conditions to sub-solvus oxidized ilmenite ilmenite promote proliferation,resulting in a variety of complex exsolution structures.Occurs at a temperature above the melting off a lot of oxidized ilmenite exsolution conditions where the result is not dissolved and development.Exsolution ilmenite oxides is due to magma during cooling cannot maintain a uniform temperature is low,therefore,lead to high temperature titanium magnetite crystals are dissolved out.(2)Both Weiya and Xiangshanxi vanadium-titanium magnetite deposits,their geochemical nature of its single mineral magnetite ore and mineralized rock is consistent.High TiO2 and FeO,alkali-rich features,and magnetite are both TiO2 content ranging from between molten magma type deposits and magmatic minerals deposit.All of them belong to magmatic magnetite.(3)Both Weiya and Xiangshanxi vanadium-titanium magnetite deposits,their magnetite indicate the source of deep material Co,Ni,Cu content is higher with magma genesis characteristics.Both magnetite Ti,V,Cr content of the three elements were higher,with the general basic-ultrabasic magmatism magnetite formed as magma same shaped magnetite.REE indicate magnetite mine with two maficultramafic rocks are homologous product.(3)In terms of rare earth elements,Both Weiya and Xiangshanxi vanadium-titanium magnetite deposits,their magnetite and their REE patterns of mineralized rock-ultramafic rocks most of the features found in more consistent comparison.Among them,Xiangshanxi magnetite deposit mineralized rock and oreilmenite gabbro have high positive Eu anomalies that including ilmenite with its large number of rock rubble plagioclase crystal related.However,the presence of magnetite negative Eu anomalies that indicating mineralization environment may reduce oxygen fugacity from morning till night.The Weiya magnetite mineralization rock REE deposit larger changes.Both REE patterns are similar are tilted to the right,slightly LREE enrichment and have a positive Eu anomaly.It is indicates that magnetite mineralization rock homologous product differentiation.But disseminated ores and ore magnetite gabbro there negative Eu anomalies may indicate mineralization process,may reduce oxygen fugacity situations or strip and disseminated ores,and disseminated ores containing ore gabbro multiple bending heavy rare earth visible phenomenon may be related to the main magmatic evolution of the late phase of magma intrusion additional relevant.(5)Titanium iron oxide and layered iron magnesia-super femic complex rock body and deposit of the magma oxygen fugacity,have important genetic relationships in the change in the process of crystallization,is the effect of mixed mineralization types of rock mass,the mineralization intensity of one of the important factors.Related to ultrabasic rock-the cause of vanadium titanium magnetite ore deposits mainly divided into two categories,one kind is rich Fe,Ti,la basaltic magma along the trend of Fenner separation crystallization occurs,leads to the formation of a disseminated type lean ore body,another kind is formed from magma liquation of rich ore bodies.Tail and the ore deposit in the titanium magnetite as crystallization differentiation factors,but the fragrance of Xiangshanxi deposit the cause of the titanium magnetite deposit in addition to the crystallization differentiation,the rich titanium magnetite is the most possible mechanism and melt away.