Crystallization of Hydrous Ti-Rich Basaltic Magma and Its Implication for the Origin of Fe-Ti Oxide in Layered Intrusions of the Emeishan Large Igneous Province  

作　　者：Junlong Yang Chao Wang Zhenmin Jin 

机构地区：[1]State Key Laboratory of Geological Processes and Mineral Resources,School of Earth Sciences,China University of Geosciences,Wuhan 430074,China

出　　处：《Journal of Earth Science》2022年第2期507-512,共6页地球科学学刊（英文版）

基　　金：supported by funds from the National Key Research and Development Program of China (No.2016YFC0600204);the National Natural Science Foundation of China (Nos.41530211 and41872061);the National Key Basic Research Program of China (No.2015CB856101);the MOST Special Fund from the State Key Laboratory of GPMR (No.MSFGPMR02-2)

摘　　要：A series of crystallization experiments have been carried out by using natural Emeishan Ti-rich hydrous basalts as starting materials at a pressure of 0.5 GPa and temperatures of 800-1000℃to constrain the origin of Fe-Ti-V oxide ore deposits.Our experimental results demonstrate that the sandwich-and trellis-type ilmenite lamellae in titanomagnetite of layered intrusions can be formed by the reaction of earlier crystallized ilmenite and the evolved parental magma.During evolution of parental basaltic magma,the Fe-Ti oxide should be composed of titanomagnetite+ilmenite in the earlier stage,but changed to titanomagnetite+titanomagnetite-ilmenite intergrowth±ilmenite at the later stage.Accordingly,the Panzhihua Fe-Ti oxide ores,which are mainly composed of titanomagnetite,should be formed earlier than the adjacent gabbro,in which titanomagnetite-ilmenite intergrowth is the major form of the Fe-Ti oxide.

关 键 词：high pressure and high temperature experiment CRYSTALLIZATION Fe-Ti oxide layered intrusion high-Ti basalt petrology 

分 类 号：P612[天文地球—矿床学]