Newly identified iron oxide-apatite deposit in Carboniferous marine vol-canic rocks in the Beishan area and its implications for regional metalloge-ny:A case study of the Biyushan iron deposit,Inner Mongolia
Newly identified iron oxide-apatite deposit in Carboniferous marine vol-canic rocks in the Beishan area and its implications for regional metalloge-ny:A case study of the Biyushan iron deposit,Inner Mongolia
[Objective]Numerous iron deposits hosted in Carboniferous marine volcanic rocks occurred in the Beis-han Orogenic Belt,Eastern Tianshan.The Biyushan iron deposit,located at the northwestern margin of Inner Mongo-lia,is a typical iron deposit hosted in Carboniferous marine volcanic rocks.[Methods]In this study,we utilized field observation,microscope imaging,and scanning electron microscopy to charaterize the mineral assemblages of iron ores and microtextures of magnetite and apatite,in order to decipher the genesis of iron ores.[Results]Our preliminary work has revealed that iron ores in the Biyushan deposit commonly have a mineral assemblage of magne-tite-apatite,with apatite having abundant monazite inclusions due to the dissolution-reprecipitation processes.In ad-dition,magnetite grains commonly have high Ti contents with ilmenite exsolution.Thus,the mineral assemblage of i-ron ores and mineralogical features of apatite and magnetite are similar to these of typical Kiruna-type deposits.[Conclusion]Based on our preliminary analysis of geological characteristics,we suggest that the Biyushan iron de-posit in Inner Mongolia is likely a Kiruna-type iron deposit hosted in submarine volcanic rocks that has not yet been documented.Therefore,these findings can guide future exploration of iron oxide-apatite deposits in this region.
关键词
基鲁纳型(铁氧化物-磷灰石型)矿床/碧玉山铁矿/磁铁矿/磷灰石/矿床成因
Key words
Kiruna(iron oxide-apatite)deposit/Biyushan iron deposit/magnetite/apatite/ore genesis
维普
万方数据