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以往在火山岩中曾发现火山(自然)铁球,但对该矿物形成的地质环境及其意义尚存在很多问题未解决,最近在武汉地院邱家骧副教授指教下进行初步综合整理.本文主要应用电子棵针扫描,矿物地质温度计,氧逸度计等测试计算方法详细研究火山(自然)铁球形成的物理化学环境和它的“双层”结构及其特征,与此同时还阐述该球体的分布状况与我省中,新生代火山机体,火山岩相之间的相互关系,从而显示此铁球主要分布于古火山机体的火山通道相或近火山口相周围的碎屑岩及熔岩中,在适当的温度和氧逸度条件下(即T=815-991.C,氧逸度fO_2=10_(-13.7)-10_(-9.2))生成的.对寻找古火山口,划分火山机体类型,岩相以及了解岩石的来源提供一定的信息.
In the past, volcanic rocks were found volcanic (natural) iron ball, but the formation of the mineral geological environment and its significance, there are still many problems remain unsolved, recently under the auspices of the Wuhan Institute Associate Professor Qiu Jiali preliminarily organized. Needle scanning, mineral geology thermometer, oxygen fugacimeter and other test calculation method to study in detail the volcano (natural) the formation of the iron ball of the physical and chemical environment and its “double ” structure and its characteristics, at the same time also elaborated the sphere Distribution and the province, the Cenozoic volcano body, the volcano rock facies, which shows that the iron ball is mainly distributed in the Paleozoic volcano channel phase or near the crater phase of clastic rocks and lavas, in the (T = 815-991.C, oxygen fugacity fO_2 = 10 _ (- 13.7) -10 _ (- 9.2)) .Aiming at finding ancient crater, dividing volcano body type, Rock facies and understanding of the source of rock provide some information.