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新疆西准噶尔铁厂沟镇南中泥盆统库鲁木迪组形成时代的重新厘定及其地质意义

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白建科, 陈隽璐, 唐卓, 张越. 新疆西准噶尔铁厂沟镇南中泥盆统库鲁木迪组形成时代的重新厘定及其地质意义[J]. 西北地质, 2015, 48(3): 72-80.
引用本文: 白建科, 陈隽璐, 唐卓, 张越. 新疆西准噶尔铁厂沟镇南中泥盆统库鲁木迪组形成时代的重新厘定及其地质意义[J]. 西北地质, 2015, 48(3): 72-80.
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BAI Jianke, CHEN Junlu, TANG Zhuo, ZHANG Yue. Redefinition of the Middle Devonian Kulumudi Formation in the South of Tiechanggou Town, West Junggar, Xinjiang and Its Geological Implications[J]. Northwestern Geology, 2015, 48(3): 72-80.
Citation: BAI Jianke, CHEN Junlu, TANG Zhuo, ZHANG Yue. Redefinition of the Middle Devonian Kulumudi Formation in the South of Tiechanggou Town, West Junggar, Xinjiang and Its Geological Implications[J]. Northwestern Geology, 2015, 48(3): 72-80.
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新疆西准噶尔铁厂沟镇南中泥盆统库鲁木迪组形成时代的重新厘定及其地质意义

  • 中国地质调查局西安地质调查中心, 陕西 西安 710054

  • 基金项目: 国家自然科学青年基金项目(41202077)和中国地质调查局项目(12120113041000, 1212011220649)联合资助成果

Redefinition of the Middle Devonian Kulumudi Formation in the South of Tiechanggou Town, West Junggar, Xinjiang and Its Geological Implications

  • Xi'an Center of China Geological Survey, Xi'an 710054, Shaanxi, China

    摘要
  • 新疆西准噶尔铁厂沟镇南部广泛出露泥盆纪陆源碎屑岩沉积地层, 对其时代归属缺乏可靠的古生物化石依据, 并一直颇有争议。前人根据岩石地层对比将其归为中泥盆统库鲁木迪组。在充分分析前人研究成果的基础上, 对该套泥盆纪地层中的岩屑凝灰岩开展LA-ICP-MS锆石U-Pb测年, 获得加权平均年龄为(379.3±5.0)Ma(MSWD=0.45), 表明新疆西准噶尔铁厂沟镇南出露的泥盆系时代跨度较大, 其中存在晚泥盆世早期沉积, 而不是前人所笼统认为的中泥盆世。因此, 将这套前人所划分的中泥盆世库鲁木迪组地层沉积时代重新厘定为中泥盆世—晚泥盆世早期更为合理。在详细测制地层剖面的基础上, 进一步分析了该套泥盆系地层的岩石组合及沉积相, 结果显示该套泥盆纪陆源碎屑岩夹少量火山碎屑岩主体形成于浅海环境。
    The Devonian terrigenous clastic rocks are widespread in the south of Tiechanggou Town, West Junggar, Xinjiang. However, due to insufficient reliable fossil evidence, the age of sedimentary strata formation is controversial. According to rock stratigraphic correlation, predecessors considered it as the Middle Devonian Kulumudi Formation. Based on the analysis of the previous research results, the debris tuff horizons were sampled from this Devonian stratum and dated using LA-ICP-MS method. The analysis shows that the zircons are typical magmatic origin with oscillatory zoning; the weighted mean 206Pb/238U age of 379.3±5.0 Ma(MSWD=0.45) shows that the Devonian stratum in the south of Tiechanggou Town have a big time span, among which there are also the early late Devonian sedimentary stratum, rather than the middle Devonian previously considered in generalities. Therefore, it is more reasonable to define the formation age of Kulumudi formation in this area between the middle Devonian and the early late Devonian. On the basis of measuring stratigraphic section in detail, this paper further analyzed their rock assemblages and sedimentary facies. The result shows that the middle-late Devonian stratum characterized by terrigenous clastic rocks intercalated with a few pyroclastic rocks formed in shallow sea environment.
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收稿日期:  2015-01-10
修回日期:  2015-04-26
刊出日期:  2015-09-15

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