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Mineralogical Characteristics of Exsolved Spinel in the Panzhihua V-Ti Magnetite Deposit, Sichuan: Implications for the Mineralization Process
ZHANG Zhibin;  HUANG Fei;  XING Miaomiao;  WAN Quan;  GAO Wenyuan;  GAO Shang;  CHEN Zhenyu;  CAI Jianhui
2018
发表期刊ACTA GEOLOGICA SINICA (English Edition)
卷号92期号:5页码:1784-1797
摘要

Spinel exsolution is widespread in titanomagnetite from the Fe‐Ti oxide gabbro of the Panzhihua intrusion, Emeishan Large Igneous Province, SW China. However, little research has been conducted into the implications of patterns in the mineralogical characteristics of the spinel for spatial variation in the controls on the exsolution mechanism and, hence, the formation process of the ore deposit. This study selected the Lanjiahuoshan Ore Block in the Panzhihua V‐Ti magnetite deposit to explore this issue, systematically studying exsolution textures in the titanomagnetite through petrographic observation and the integrated use of in‐situ microanalysis. The results show that the exsolved spinel gradually becomes finer‐grained and less abundant from the center to edge and the bottom to top of the ore bodies. Compositionally, there is an inverse correlation between the size of exsolved spinel grains and their Mg# value. In addition, there is compositional zonation in the spinel interiors, with a gradual increase in the Mg content and decrease in Fe content from the core to the rim. The analysis suggests that fractional crystallization of ferrotitanium magma with a high oxygen fugacity in a shallow magma chamber caused compositional differences in the primary magnetite solid solution in different parts of the Panzhihua intrusion. Additionally, the thermal evolution of the magnetite solid solution differed in different parts of orebody, bringing about variations in spinel development. Together, these effects resulted in spatial variation in the abundance, grain size, and morphology of spinel in different parts of the orebody and intrusion that follows an identifiable distribution law. Furthermore, the compositional zonation of exsolved spinels reflects the rapid growth of exsolution features in a high‐temperature environment. Thus, the size, morphology, abundance, and composition of spinel exsolution features in titanomagnetite provide a valuable petrogenetic tool for estimating the maturity and formational environment of the deposit.

关键词Spinel Exsolution Mineralogical Characteristics Compositional Zonation Mineralization Process Panzhihua Sichuan
收录类别CSCD
语种英语
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文献类型期刊论文
条目标识符http://ir.gyig.ac.cn/handle/42920512-1/8911
专题矿床地球化学国家重点实验室
作者单位1.College of Resources and Civil Engineering, Northeastern University, Shenyang 110819, China
2.State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China
3.School of Civil Engineering, Shijiazhuang Tiedao University, Shijiazhuang 050043, China
4.Key Laboratory of Metallogeny and Mineral Resource Assesment, Ministry of Land and Resources, Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China
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ZHANG Zhibin;HUANG Fei;XING Miaomiao;WAN Quan;GAO Wenyuan;GAO Shang;CHEN Zhenyu;CAI Jianhui. Mineralogical Characteristics of Exsolved Spinel in the Panzhihua V-Ti Magnetite Deposit, Sichuan: Implications for the Mineralization Process[J]. ACTA GEOLOGICA SINICA (English Edition),2018,92(5):1784-1797.
APA ZHANG Zhibin;HUANG Fei;XING Miaomiao;WAN Quan;GAO Wenyuan;GAO Shang;CHEN Zhenyu;CAI Jianhui.(2018).Mineralogical Characteristics of Exsolved Spinel in the Panzhihua V-Ti Magnetite Deposit, Sichuan: Implications for the Mineralization Process.ACTA GEOLOGICA SINICA (English Edition),92(5),1784-1797.
MLA ZHANG Zhibin;HUANG Fei;XING Miaomiao;WAN Quan;GAO Wenyuan;GAO Shang;CHEN Zhenyu;CAI Jianhui."Mineralogical Characteristics of Exsolved Spinel in the Panzhihua V-Ti Magnetite Deposit, Sichuan: Implications for the Mineralization Process".ACTA GEOLOGICA SINICA (English Edition) 92.5(2018):1784-1797.
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