| 广西江平地区沙坝-泻湖沉积相序与沉积环境演变过程 |
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| 引用本文： | 黎广钊,农华琼,梁文,廖思明,亓发庆.广西江平地区沙坝-泻湖沉积相序与沉积环境演变过程[J].海洋科学进展,1999(2). |
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| 作者姓名： | 黎广钊 农华琼 梁文 廖思明 亓发庆 |
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| 作者单位： | 广西海洋研究所!北海市，５３６０００，广西海洋研究所!北海市，５３６０００，广西海洋研究所!北海市，５３６０００，广西海洋研究所!北海市，５３６０００，国家海洋局第一海洋研究所!青岛，２６６００３ |
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| 基金项目： | 国家自然科学基金!49766013 |
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| 摘 要： | 本文在地貌、第四纪地质野外调查和３３个钻孔资料的基础上，运用粒度、碎屑重矿物、微体古生物和１４Ｃ年代测定等方法探讨江平沿岸沙坝－泻湖体系的沉积相序和沉积环境演变过程。沙坝－泻湖发育在一片起伏不平的基岩侵蚀面上，其沉积相序自下而上为：基岩侵蚀面→河床→、河漫滩相→河口湾、近岸浅海相→滨外沙坝、半封闭泻湖相→风成沙丘、封闭充填泻湖沼泽相。本区的沙坝泻湖属于海退型。作者初步认为本区沙坝可分为新、老２期，老沙坝大约形成于６７００～３６００ａＢ．Ｐ，新沙坝大约形成于２３００～１０００ａＢ．Ｐ。
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| 关 键 词： | 沙坝-泻湖 沉积相序 环境演变 |
Sedimentary Facies Sequences and Evolutionary Process of Sedimentary Environment of the Barrier-lagoons in Jiangping area, Guangxi |
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| Li Guangzhao,Qi Faqing, Nong Huaqiong,Liang Wen, Liao Siming.Sedimentary Facies Sequences and Evolutionary Process of Sedimentary Environment of the Barrier-lagoons in Jiangping area, Guangxi[J].Advances in Marine Science,1999(2). |
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| Authors: | Li Guangzhao Qi Faqing Nong Huaqiong Liang Wen Liao Siming |
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| Institution: | Li Guangzhao1,Qi Faqing2, Nong Huaqiong1,Liang Wen1, Liao Siming1 |
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| Abstract: | On the basis of the landform and the field investigation of the Quaternary geology and thedata of 33 drilling bores, thiss paper discusses sedimentary facies sequences and evolutionaryprocess of sedimentary environment of the barrier-lagoons in Jiangping area, Guangxi, accord-ing to size of grains, heavy minerals, micropaleontologic analyses and 14 C dating. The barrierlagoons develop on the uneven erosional surface of basement rock. From bottom to top, the sedimentary sequences are erosional surface of basement rock river bed,flood land factesestuary,off shore factes offshore bars,Semi-enclosed lagoon facies wind-borne dunes, closed filling lagoon facies. The barrier-lagoons belong to marine regression type. The authors preliminarily consider that these barriers can be divided into two ages: the new age and the old age. Oldbarriers were formed about 6 700~3600 a B. P., and the new barriers were formed about2300~1000 a B. P.. |
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| Keywords: | Barrier-lagoon Sedimentary facies sequences Environmental evolution |
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