Hematite (Fe2O3) and ilmenite (FeTiO3) belong to the trigonal system, and can form a complete solid solution series at high temperature (above 650°C), and immiscible separation of the solid solution occurs during the cooling process, and thus in the ilmenite A micron-nanometer hematite platelet was formed. Theoretically, the magnetite + rutile combination should be more stable than the ilmenite + hematite combination and more likely to exist. However, in the related petrological experiments and field observations, it is difficult to find a phenomenon in which the transition from ilmenite-hematite solid solution (Ilm-Hemss) to magnetite+rutile mineral combination occurs.
Dr. Wei Tan, PhD student of the Key Laboratory of Mineralogy and Metallogeny, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, under the guidance of researcher He Hongping and Wang Yan, a new street magnesite-ultramafic layered rock mass in Panxi, China A rare magnetite + rutile segregation was found in ilmenite. It is considered that the relatively rich titanium Ilm-Hemss oxidize under the solid-phase conditions, making the solid solution gradually deplete of titanium, so that firstly rutile is precipitated and the main crystal interface of rutile is formed, and then the Fe3+ interface in the solid solution segregates, and thus It is beneficial to the formation of magnetite and the further cyclic growth of rutile-magnetite mixed crystals.
The results of this study provide new clues and ideas for the different types of solid phase transformation mechanisms of ilmenite-hematite solid solutions under sub-solid conditions and the inversion of physico-chemical conditions during the evolution of layered rock masses. Relevant results have been published in the American Mineralogist (2015, 100:2348–2351), a major journal of international mineralogy.
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