| 云南东部下震旦统地层复议——牛头山区下震旦统层序的确立 |
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| 引用本文： | 刘鸿允,熊家镛,蔡宗柏,董榕生,李建林,戚中林.云南东部下震旦统地层复议——牛头山区下震旦统层序的确立[J].地质科学,1983,0(2):103-115. |
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| 作者姓名： | 刘鸿允 熊家镛 蔡宗柏 董榕生 李建林 戚中林 |
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| 作者单位： | 1. 中国科学院地质研究所;
2. 云南省地质局区域地质调查队;
3. 成都地质学院 |
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| 摘 要： | 云南东部系指东川-昆明-玉溪一线以东(图1)。这一地区的下震旦统,长期以来认为只有澄江组一个地层单位。1960年刘鸿允等1]通过对陆良牛头山区的调查,在南沱组之下建立了牛头山组,其层位认为在澄江组之上或部分与澄江组相当。
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| 关 键 词： | , |
| 收稿时间： | 1982-09-03 |
| 修稿时间： | 1982-09-03; |
REPEATED DISCUSSION ABOUT THE SUCCESSION OF LOWER SINIAN SERIES IN EASTERN YUNNAN——DECIDED ESTABLISHMENT OF STEATIGRAPHICAL SEQUENCE OF THE LOWEE SINIAN SERIES IN NIUTOUSHAN AREA |
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| Liu Hungyun,Xiong Jiayong,Cai Zhongbai,Dong Rongsheng,Li Jianlin,Qi Zhonglin.REPEATED DISCUSSION ABOUT THE SUCCESSION OF LOWER SINIAN SERIES IN EASTERN YUNNAN——DECIDED ESTABLISHMENT OF STEATIGRAPHICAL SEQUENCE OF THE LOWEE SINIAN SERIES IN NIUTOUSHAN AREA[J].Chinese Journal of Geology,1983,0(2):103-115. |
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| Authors: | Liu Hungyun Xiong Jiayong Cai Zhongbai Dong Rongsheng Li Jianlin Qi Zhonglin |
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| Institution: | 1. Institute of Geology, Academia Sinica;
2. Regional of Suruey Team Geology of Yunnan;
3. Chengdu College of Geology |
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| Abstract: | Since the Niutoushan formation proposed in 1960,problem of the Lower Sinianin eastern Yunnan is composed of one unit or of two units——Chengiang formationand Niutoushan formation,was subjected to argument during the last 20 years.Recently,through authors studied once again the stratigraphic succession in that region,some new realizations are furthermore approached.The Lower Sinian rocks developed in eastern Yunnan may be divided into two stratigraphic provices:Eastern marginal region of Kan-dian swell province,composed of Niutoushan formation and Chengjiang formation;and Niutoushan province,composed of Niutoushan formation and Luliang formation.The Niutoushan formation is not only known in Niutoushan mountainous area,but rather extensively existent in eastern marginal region of Kan-dian swell.It is disconformably or unconformably laid under the Nantuo formation,and conformably upon the Chengjiang or Luliang formation.Its stratigraphic position is clearly determined,thus as a lithostratigraphic unit of the Lower Sinian may be decisively established.In Niutoushan area,the large sandstone series conformably underlying the Niutoushan formation and unconformably overlying the Kunyang group,which although is much similar to the Chengjiang formation in lithologieal character but also with certain difference,moreover different views on the stratigraphic position of it are prevalent,so it is else named here the Luliang formation.The authors realize that both Luliang and Chengjiang formations are correspondente in stratigraphic position,similar in rock component and sedimentary environment,alike in folding pattern and have not undergone metamorphism.Luliang formation and Chengjiang formation should be deposits of simultaneous time.The profound unconformity between the Luliang formation and the underlying Kunyang group represents the strong Jinning orogeny,which marks the base of Sinian system.Luliang formation is covered concordantly by the Niutoushan formation,and Niutoushan formation is covered discordantly by the Nantuo formation of Upper Sinian series,so its age should be designated as the beginning of early Sinian.The Chengjiang movement occurred at the end of Early Sinian manifests irregularly in different regions of eastern Yunndn.On the border region of the Xiaojiang fracture and the east of it,it is intensely appeared that the Chengjiang,Luliang or Niutoushan formation are covered unconformably by Nantuo or Doushantuo formation.While the west of Xiaojiang fracture,it appears as disconformity or weak unconformity between the Nantuo formation and Chengjiang or Niutoushan formation. |
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