| 最优分割法在内蒙古东升庙矿区狼山群地层划分中的应用 |
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| 引用本文： | 彭润民.最优分割法在内蒙古东升庙矿区狼山群地层划分中的应用[J].化工矿产地质,1993(4). |
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| 作者姓名： | 彭润民 |
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| 作者单位： | 化学工业部化学矿产地质研究院 |
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| 摘 要： | 东升庙一带含矿岩系狼山群的地层划分到目前为止已有三种方案,即内蒙冶金一队的“三组九亚组”方案、河北地质学院和内蒙化工地质队的“三组九段”方案以及彭润民的“新三组九段”划分方案。这三种方案都是根据岩性及组合特征从宏观上进行的划分。本文以狼山群连续地层中的60个样品中21种微量元素含量为变量,用最优分割法定量地分段,并与上述三种划分方法对比。分割及对比结果表明,除前两种划分法的三组与二组之间没有出现分割点外,其余各段(组)之间均先后出现了分割点,这表明上述三种划分方案总的说是可行的;第三种划分方案的第二、三两组之间(样品11/12)的分割点最早出现,且此后一直连续稳定存在,这表明第三种划分方案更趋合理。样品11和12间连续稳定的分割面很可能相当于渣尔泰(狼山)群地层中的“低水位剥蚀面”。
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| 关 键 词： | 狼山群 地层划分 最优分割 内蒙古东升庙 |
APPLICATION OF OPTIMUM SEGMENTATION METHOD TO THE STRATIGRAPHIC DIVISION OF THE LANGSHAN GROUP IN THE DONGSHENGMIAO MINING DISTRICT,INNER MONGOLIA |
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| Abstract: | So far,there have been three schemes for stratigraphic division of the ore-bearing sequences of the Langshan group around the Dongshengmiao mining district,Inner Mongolia.Namely,‘three-formation-nine-subformation’division put forwardby the Inner Mongolia No.1 Geological Team of Minitry of Metallurgical Industry,‘three-formation-nine-member’division by Hebei College of Geology and the InnerMongolia Geological Team for Chemical Minerals and renewed‘three-formation-nine-member’division by Peng Runmin.All of these three divisions are based onfeaturing the lithological assemblages of the Langshan group in a more macroscopicway.The present paper deals with rationalities of the three divisions by usingoptimum segmentation method of mathematical geology.Particular practice is,taking amounts of 21 trace elements in the 60 samples continuously collected throughthe Langshan group to be regarded as variables,these samples may be dividedquantitively by means of optimum segmentation,the results compared with the abovethree divisions.The segmentation and comparison reveal that the segmentation pointscan be noticed successively between all the formations(members)except between thethird formations and second formations of the former two divisions.All this meansthe exsiting division schemes are basically reasonable but Peng Runmin's schemeseams more just because the segmentation points between its second and thirdformations emerge not only earliest but also afterward successively.It isnoticeworthy that a continuous and consistent segmentation plane at the interval ofthe samples 11 to 12 is most possibly equivalent to‘low water denudation plane’stretching out within the Chaertai(Langshan)group. |
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