When we investigated the occurring conditions of the iron-riih deposits in Jining-Erlian area, Nei Mongol, in 1977, many opaque and shiny steel balls about 200μ in diameter have been found in the strong magnetic frac...When we investigated the occurring conditions of the iron-riih deposits in Jining-Erlian area, Nei Mongol, in 1977, many opaque and shiny steel balls about 200μ in diameter have been found in the strong magnetic fraction of both natural and artifact heavy minerals from the Wenduermiao Group and Bainaimao Group. Examinations of different approaches led to the conclusion that they are the cosmic dusts.展开更多
研究区位于内蒙古苏尼特右旗温都尔庙地区(图1),是古生代存在于西伯利亚板块与华北板块之间的古亚洲洋闭合之后形成的索伦山-西拉木伦对接带的重要组成部分(Zhang et al.,2014;潘桂棠等,2016)。本文是在1∶5万区调工作的基础上1,应用洋...研究区位于内蒙古苏尼特右旗温都尔庙地区(图1),是古生代存在于西伯利亚板块与华北板块之间的古亚洲洋闭合之后形成的索伦山-西拉木伦对接带的重要组成部分(Zhang et al.,2014;潘桂棠等,2016)。本文是在1∶5万区调工作的基础上1,应用洋板块地质学(OPG)理论及造山带填图方法.展开更多
文摘When we investigated the occurring conditions of the iron-riih deposits in Jining-Erlian area, Nei Mongol, in 1977, many opaque and shiny steel balls about 200μ in diameter have been found in the strong magnetic fraction of both natural and artifact heavy minerals from the Wenduermiao Group and Bainaimao Group. Examinations of different approaches led to the conclusion that they are the cosmic dusts.
