Study of Pyroxene in Junggar Basin Basement Volcanic Rock and Its Indicator to Basin Basement Characteristics
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摘要: 根据钻井和航磁资料, 准噶尔盆地基底可划分为西、北、南三区.3个地区火山岩中辉石的化学成分、种属名称各不相同.辉石化学成分反映出来的寄主岩的碱度、碱度演化趋势以及寄主岩形成的构造环境、构造环境演化史均各有差异, 佐证了准噶尔盆地基底是由哈萨克斯坦板块东南缘、西伯利亚板块西南缘和塔里木板块北缘增生大陆拼合而成.其中西、北两区拼合较早, 早石炭世末的早海西运动时抬升成陆; 南区成陆较晚, 晚石炭世末的晚海西运动使南区与西、北两区联合大陆对接, 形成完整的准噶尔盆地海西褶皱基底.Abstract: Junggar basin basement can be divided into three areas (west, north and south) by data from drilling and aeromagnetism. These areas contain all sorts of chemical components and type names of pyroxene. While these pyroxene chemical components are shown to be quite different by the volcanic rock alkalinity, its evolution trend, formation tectonic environments and its tectonic environment evolution history. This proves that Junggar basin basement is composed of amalgamation of the growing continent of the southeastern margin of the Kazakhstan plate, the southwestern margin of the Siberia plate and the northern margin of the Tarim plate. During the amalgamation, the western and northern parts joined together earlierly, and formed the continent by the uplift in the early Hercynian orogeny in the late Early Carboniferous. While the southern part was relatively late in the continent formation and Late Carboniferous plate movement caused the combination of the southern and the northwestern continents thus forming the complete Junggar basin fold basement.
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Key words:
- volcanic rock /
- clinopyroxene /
- tectonic setting /
- Junggar basin
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图 2 单斜辉石的w (SiO2) -w (Al2O3) 和w (Al2O3) -w (TiO2) 图解[4]
S.拉斑玄武岩系列; A.碱性玄武岩系列; Ⅰ.西区火山岩碱度演化趋势; Ⅱ.北区火山岩碱度演化趋势; Ⅲ.南区火山岩碱度演化趋势
Fig. 2. Correlogram of w (SiO2) -w (Al2O3) and w (Al2O3) -w (TiO2) in clinopyroxene
表 1 单斜辉石电子探针分析结果
Table 1. Electronprobe analyses of clinopyroxene
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