| 滇池湖盆第四系沉积相、古地磁和孢粉的初步研究 |
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| 引用本文： | 罗建宁,肖永林,庄忠海,陈乐尧,苏俊周,邹培馨.滇池湖盆第四系沉积相、古地磁和孢粉的初步研究[J].地球学报,1983,5(2):65-78. |
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| 作者姓名： | 罗建宁 肖永林 庄忠海 陈乐尧 苏俊周 邹培馨 |
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| 作者单位： | 成都地质矿产研究所;成都地质矿产研究所;成都地质矿产研究所;成都地质矿产研究所;成都地质矿产研究所;成都地质矿产研究所 |
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| 摘 要： | 滇池湖盆位于云南省中部,是该省内较大型的山间盆地之一。盆地中沉积了较厚的新生代地层,并有多层褐煤和油气显示。 为解决昆明地区的能源和用水问题,建国以后有许多地质单位和研究者在本区作过大量的地质勘探和研究工作,为进一步研究该盆地提供了丰富的资料。一九七九年以来,笔者在野外工作的基础上,对滇池东北侧施工的Tk-9和Tk-15孔的岩心进行了较系统的沉积相、古地磁和孢粉等工作。本文就已获得的部分资料,提出一些看法。
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THE STUDY ON THE SEDIMENTARY FACIES,PALEOMAGNETISM AND PALYNOLOGY OF QUATERNARY SEDIMENTS IN DIANCHI LAKE BASIN, YUNNAN |
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| LUO Jian-ning,XIAO Yong-lin,ZHUANG Zhong-hai,CHEN Le-yao,SU Jun-zhou and ZOU Pei-xin.THE STUDY ON THE SEDIMENTARY FACIES,PALEOMAGNETISM AND PALYNOLOGY OF QUATERNARY SEDIMENTS IN DIANCHI LAKE BASIN, YUNNAN[J].Acta Geoscientia Sinica,1983,5(2):65-78. |
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| Authors: | LUO Jian-ning XIAO Yong-lin ZHUANG Zhong-hai CHEN Le-yao SU Jun-zhou and ZOU Pei-xin |
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| Institution: | Chengdu Institute of Geology and Mineral Resources, Chinese Academy of Geological Sciences;Chengdu Institute of Geology and Mineral Resources, Chinese Academy of Geological Sciences;Chengdu Institute of Geology and Mineral Resources, Chinese Academy of Geological Sciences;Chengdu Institute of Geology and Mineral Resources, Chinese Academy of Geological Sciences;Chengdu Institute of Geology and Mineral Resources, Chinese Academy of Geological Sciences;Chengdu Institute of Geology and Mineral Resources, Chinese Academy of Geological Sciences |
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| Abstract: | Dianchi Lake Basin is a Cenozoic fault basin controlled by rift systemin S-N direction. The bedrock of the lake basin consists of mainly Palaeozoic strata, on the top of which is usually a layer of lateritic residuum. TheCenozoic sediments are about 500 m thick on average, with a maximum morethan 1000 m. These sediments are predominantly of lacustrine facies, whichare composed mainly of gray, greenish gray mud, silty mud, silt, sand andsandy gravel, intercalated with about 7-20 lignite beds. Abundant nonmarinefossils have been found from these sediments. The Cenozoic strata from theupper lignite downwards were referred to as the Late Tertiary deposits inthe past. A comprehensive study has been on two cores, the core TK-15 and Tk-9in the northeastern side of Dianchi Lake. As a result the following facieshave been recognized in the sediments: shore sandgravel, shore sand, shallow lake siltmud and carbonaceous mud-lignite facies of lake-marsh environments, and sandgravel, sand, siltmud and carbonaceous mud facies of riverand deltaic environments. The paleomagnetic data obtained from the two cores show that theseCenozoic strata have a general positive polarity, corresponding to the BrunhesNormal Epoch. There are also five short reversal events on the positive background, named tentatively as DA, DB, D_1, D_2 and D_3 downwards, correla-table with those of the magnetic stratigraphic sections of Biwa Lake corein Japan and V20-108 in the Pacific Ocean. This suggests that all Cenozoicsediments in the two cores are of Middle-Late Quaternary age. Also the palynology data show Quaternary characteristics. The representative sporopollen components are mainly Quercus,Pinus, Abies and Picea ofwooden plant, and herbs of Gramineae, Persicaria, Compositae, Umbelliferaeand so on. The Quaternary sporo-pollen sequence can be divided into sixstages with different assemblages, which witnessed a periodic variation ofcold and worm climate. The same conclusion was reached by the study onthe surface texture of quartz in the sediments. The quartz sand surface textures in layers containing cold climatic type of pollen assemblage show ice-wornfeatures. |
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