| 云南景洪上泥盆统南光组沉积环境新议 |
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| 引用本文： | 俞赛赢,冯凡斌,刘桂春,聂小妹,陈光艳,张志斌,冯庆来.云南景洪上泥盆统南光组沉积环境新议[J].地质通报,2013,32(10):1596-1600. |
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| 作者姓名： | 俞赛赢 冯凡斌 刘桂春 聂小妹 陈光艳 张志斌 冯庆来 |
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| 作者单位： | 1. 云南省地质调查院，云南 昆明 650041；
2. 广东省核工业地质局293队，广东 广州 510800；
3. 中国地质大学地质过程与矿产资源国家重点实验室, 湖北 武汉 430074 |
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| 摘 要： | 云南景洪东南地区出露一套泥盆系，前人将其以粗粒碎屑岩为特征的部分命名为怕当组，根据腕足类化石鉴定其地质时代为中泥盆世；以碎屑岩、凝灰岩为特征的部分被命名为南光组，根据植物化石斜方薄皮木（Lepotophloeum rhombicum）划归晚泥盆世。对其沉积环境尚存在陆相和海陆交互相、浅海陆架相、半深海-深海相沉积环境的不同认识。本研究发现，粗粒碎屑岩层序中也发现有晚泥盆世标准植物化石斜方薄皮木（Lepotophloeum rhombicum），并且粗粒碎屑岩层序位于剖面上部，南光组位于剖面下部，说明两者的地质时代均为晚泥盆世。故建议废除怕当组，将两者合并为上泥盆统南光组。南光组具有典型的鲍马序列特征，含有放射虫等海洋环境生物化石，属于深海浊流沉积层序。
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| 关 键 词： | 泥盆系 南光组 深海环境 鲍马序列 云南 |
New opinions on the sedimentary environment of the Upper Devonian Nanguang Formation in Jinghong, southern Yunnan |
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| YU Sai-ying,FENG Fan-bin,LIU Gui-chun,NIE Xiao-mei,CHEN Guang-yan,ZHANG Zhi-bin,FENG Qing-lai.New opinions on the sedimentary environment of the Upper Devonian Nanguang Formation in Jinghong, southern Yunnan[J].Geologcal Bulletin OF China,2013,32(10):1596-1600. |
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| Authors: | YU Sai-ying FENG Fan-bin LIU Gui-chun NIE Xiao-mei CHEN Guang-yan ZHANG Zhi-bin FENG Qing-lai |
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| Institution: | 1. Yunnan Institute of Geological Survey, Kunming 650041, Yunnan, China;
2. No. 293 Geological Party, Guangdong Bureau of Nuclear Industry, Guangzhou 510800, Guangdong, China;
3. State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences,
Wuhan 430074, Hubei, China |
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| Abstract: | The Devonian strata distributed in southeastern Jinghong of Yunnan were partly named the Padang Formation for the strata composed of coarse clastic rocks, and partly named the Nanguang Formation for the strata characterized by fine clastic rocks and tuff. The Padang Formation was assigned to Middle Devonian according to the brachiopeds fauna whereas the Nanguang Formation to Upper Devonian according to Lepotophloeum rhombicum. Much controversy has existed concerning their sedimentary environments, and the opinions include continental environment, alternating environments between continent and marine, neritic shelf, and subabyss-abyss environments. The authors' investigation indicates that the index fossil of Late Devonian, Lepotophloeum rhombicum, is also discovered from the Padang Formation and that the Padang Formation is younger than the Nanguang Formation on the basis of the sedimentary sequence. Therefore, it is suggested that the name of Padang Formation should be abolished and that the whole sequence should be named the Nanguang Formation belonging to Upper Devonian. The Nanguang Formation is characterized by typical Bouma sequences with fossil radiolarians and represents deep-sea turbidite fan successions. |
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| Keywords: | Devonian Nanguang Formation deep-sea environment Bouma sequence Yunnan |
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