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Geological And Geochemical Characteristics And Genesis Of The Zhibo Iron Deposit In Xinjiang Province

Posted on:2015-07-22Degree:MasterType:Thesis
Country:ChinaCandidate:F B MaFull Text:PDF
GTID:2180330467477264Subject:Mineral prospecting and exploration
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As an important part of the West Tianshan metallogenic belt, Awulale metallogetic sub-belt consists of many medium and large ore deposits. Zhibo iron deposit, which is one of the typical deposits in the metallogetic belt, is hosted in the volcanic rocks of the Carboniferous Dahalajunshan Formation. A detailed study has been carried out on the ore deposit geology, mineralogy and geochemistry of the Zhibo iron deposit on the basis of collectting previous data and field investigation. Some achievements have been obtained in this thesis.The mineralization process of the Zhibo iron deposit can be divided into magmatic and hydrothermal metallogenic periods. The hydrothermal metallogenic period includes three metallogenic stages:silicate-oxide, sulfide and quartz-carbonate stages. Electron microprobe analyses show that amphibole mostly belongs to actinolite of calcium amphibole and is rich in Mg and Si and poor in Ti and Al. Epidote is characterized by enrichment of Al and Ca and pooring of Fe and Mg. Magnetite formed in the hydrothermal has higher contents of Mg, Mn and Na and lower contents of Ti and Al.Most of volcanic rocks in this region belong to calc-alkaline and high-K calc-alkaline volcanic rock association, with lithology of trachyte andesite, basaltic andesite and basaltic trachyte andesite. The volcanic rocks were formed in the tectonic environment of continent marginal arc, and assimilate-contamination and fractional crystallizationof the magma responsible for the formation of the volcanic rocks occurred in its upwelling process. The analyses of major, trace and rare earth elements for the vocanic rocks, altered rocks and iron ores show that volcanic rocks and magnetite have the same material source. The altered rocks were formed in the process of metasomatic alteration of volcanic rocks by postvolcanic hydrothermal fluids. During this period, iron was extracted from the volcanic rocks and enriched gradually in the hydrothermal fluids for the formation of the deposit.The analyses of O isotopes for magnetite, S isotopes for pyrite, and Pb isotopes for magnetite of the Zhibo iron deposit show derivation of metallogenic material from magma, and iron partially from volcanic rocks. Formed nearby volcanic vent, the Zhibo iron deposit belongs to a volcanic magma-hydrothermal deposit associated with volcanic-subvolcanic hydrothermal activeities.
Keywords/Search Tags:Ore deposit geology, mineralogy and geochemistry, genesis ofdeposit, Zhibo iron deposit, Xinjiang
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