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标题：Composition of ilmenite and provenance of zircon in northern Brazil
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作者：Christian Knudsen ; Tonny B. Thomsen ; Feiko Kalsbeek 等
期刊名称：Geological Survey of Denmark and Greenland Bulletin
印刷版ISSN：1604-8156
出版年度：2015
卷号：33
页码：81-84
语种：English
出版社：De Nationale Geologiske Undersoegelser for Danmark og Groenland
摘要：Te mineral ilmenite (FeTiO3) is an important componentof heavy-mineral placer deposits and constitutes the largestvolume of valuable mineral in such deposits. Te mineralszircon (ZrSiO4) and rutile (TiO2), which occur in lower concentrations than ilmenite in the deposits, have a greater valueper ton – c. 1100 and 900 $/ton respectively – compared toilmenite that ranges from 100 to 200 $/ton depending onits composition. Other minerals such as staurolite, sillimanite, amphibole and garnet are generally also present in placerdeposits, but are of minor or no commercial value and, e.g.amphibole needs to be separated from the valuable heavyminerals which adds to the production cost.