Magnetite Composition and Its Genetic Significance of the Songhu Iron Deposit in the Western Tianshan,Xinjiang,NW China
Zhu Weina
Wang Yitian
Wang Chunlong
Zhang Bing
Zhang Licheng
Ren Yi
Xiao Yanhong
Yuan Yanchao
Hu Xiangbo
Abstract：The Songhu iron deposit located in the middle Awulale Fe-Cu metallogenic belt of Western Tianshan.The minraliza-tion of Songhu iron deposit included two metallogenic periods which could be further subdivided into six metallogenic stages,i. e.,sulfide-k-feldspar stage,hematite-calcite-chlorite stage,magnetite-chlorite-k-feldspar stage (early stage of magnetite), magnetite-sulfide stage(late stage of magnetite),calcite-chalcopyrite stage and supergene period.In order to analyze the charac-teristics and causes of its components,Electron microprobe analyses show that the magnetites formed in early stage were rich in FeO T and poor in TiO 2 ,Al2 O 3 ,MgO,MnO,which are similar to those of contact-metasomatic deposits.High content of SiO 2 suggests that the formation of early magnetite was associated with acidic magmatic hydrothermal system.Late magnetite stage was the main minralization stage which was widely superimposed on ores formed during the early stage.Magnetites have lower content of FeO T and higher content of TiO 2 ,MnO,V2 O 3 ,MgO,Al2 O 3 .Both ternary plot of TiO 2-Al2 O 3-MgO and Ca+Al+Mn vs.Ti+ V discriminant diagram suggest that late magnetites were the product of hydrothermal mineralization. Considering the geological features of ore deposit,we infer that late magnetites are formed in the late magmatic activity or peri-od of inactivity with the participation of sea water.
Keywords：magnetiteEMPAcompositionSonghu iron depositAwulale metallogenic beltWestern Tianshan
Publication Date：2015-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：18( 1723-1740 )