杨雅军, 杨晓平, 江斌, 张渝金, 刘桂香, 谭红艳, 汪岩, 付俊彧, 邵军. 大兴安岭地区Nestoria动物群分布、时限及晚中生代火山-沉积地层的厘定[J]. 地质通报, 2020, 39(6): 827-838.
    引用本文: 杨雅军, 杨晓平, 江斌, 张渝金, 刘桂香, 谭红艳, 汪岩, 付俊彧, 邵军. 大兴安岭地区Nestoria动物群分布、时限及晚中生代火山-沉积地层的厘定[J]. 地质通报, 2020, 39(6): 827-838.
    YANG Yajun, YANG Xiaoping, JIANG Bin, ZHANG Yujin, LIU Guixiang, TAN Hongyan, WANG Yan, FU Junyu, SHAO Jun. Distribution and time frame of Nestoria fauna and determination of Late Mesozoic volcanic-sedimentary strata in the Da Hinggan Mountains[J]. Geological Bulletin of China, 2020, 39(6): 827-838.
    Citation: YANG Yajun, YANG Xiaoping, JIANG Bin, ZHANG Yujin, LIU Guixiang, TAN Hongyan, WANG Yan, FU Junyu, SHAO Jun. Distribution and time frame of Nestoria fauna and determination of Late Mesozoic volcanic-sedimentary strata in the Da Hinggan Mountains[J]. Geological Bulletin of China, 2020, 39(6): 827-838.

    大兴安岭地区Nestoria动物群分布、时限及晚中生代火山-沉积地层的厘定

    Distribution and time frame of Nestoria fauna and determination of Late Mesozoic volcanic-sedimentary strata in the Da Hinggan Mountains

    • 摘要: 为了提高大兴安岭地区晚中生代火山-沉积地层的区域对比性,通过大兴安岭地区1:100万地质编图工作,对大兴安岭地区晚中生代火山-沉积地层进行了重新厘定划分。依据岩石组合、地层关系、古生物化石组合,结合同位素测年数据,将大兴安岭地区晚中生代含Nestoria动物群的火山-沉积地层分别归属为白音高老组和梅勒图组,确认大兴安岭地区Nestoria动物群主要演化时代在127.6~141 Ma之间,与冀北大北沟组时代(137~133 Ma)相当,进一步细化了白音高老组(133~142 Ma)和梅勒图组(131~138 Ma)的形成时代。根据Nestoria动物群赋存层位和同位素测年数据,将原满克头鄂博组、木瑞组、上库力组、光华组中含Nestoria动物群的酸性火山-沉积地层厘定为白音高老组,原玛尼吐组含Nestoria动物群的中基酸性火山-沉积地层厘定为梅勒图组,依据地层上下关系对原填图单位进行了重新厘定,为进一步研究大兴安岭地区晚中生代火山活动提供了重要的证据。

       

      Abstract: In order to improve the regional correlation of the Late Mesozoic volcanic-sedimentary strata in the Da Hinggan Mountains, the authors made reclassification of the strata by using geological mapping at the 1:1 million scale.On the basis of rock associations, stratigraphic relations, and paleontological fossil assemblages combined with the isotopic dating data, the Late Mesozoic volcanic-sedimentary strata containing Nestoria fauna in the Da Hinggan Mountains should respectively belong to the Baiyin'gaolao Formation and Meiletu Formation, thus confirming that the time of Nestoria fauna in the Da Hinggan Mountains region should be from 127.6 Ma to 141 Ma, which is equivalent to the age of Dabeigou Formation(137~133 Ma)in Jibei. Additionally, the Baiyin'gaolao Formation and Meiletu Formation were reclassified, and the ages should be 133~142 Ma and 131~138 Ma respectively.According to the horizon of Nestoria fauna and the isotope dating data, the original acidic volcanic rock strata containing Nestoria fauna of the Manketou'ebo Formation, Murui Formation, Shangkuli Formation and Guanghua Formation were reclassified as the Baiyin'gaolao Formation, meanwhile the original intermediate-acid volcanic rocks containing Nestoria fauna of Ma'nitu Formation were reclassified as the Meiletu Formation.On the basis of stratigraphic relations, the original mapping units were reclassified, which provides important evidence for further study of the volcanic activity in the Da Hinggan Mountains during the Late Mesozoic.

       

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