| 引用本文： |
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黎广钊,梁文,农华琼,刘敬合.北海外沙泻湖全新世硅藻、有孔虫组合与沉积相演化[J].广西科学,1999,6(4):311-316. [点击复制]
- Li Guangzhao,Liang Wen,Nong Huaqiong,Liu Jinghe.Diatom,Foraminifera Assemblages and Evolution of Sedimentary Facies in the Holocene Strata of Waisha Lagoon,Beihai[J].Guangxi Sciences,1999,6(4):311-316. [点击复制]
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| 摘要: |
| 系统分析北海外沙泻湖CK10钻孔岩芯的硅藻、有孔虫、介形虫化石,并进行14C年代测定,探讨硅藻、有孔虫组合特征、沉积相演化和地层年代。该孔全新世地层硅藻化石群自下而上划分为:Ⅰ.波缘曲壳藻(Athnanthes crenulata)-亲缘桥弯藻(Cymbella affinis)-披针桥弯藻(Cym.lanceolata),Ⅱ.亲缘桥弯藻-波缘曲壳藻-卵形菱形藻(Nitzschia cocconeiformis),Ⅲ.亲缘桥弯藻-波缘曲壳藻-史密斯双壁藻(Diploneis smithii),Ⅳ.波缘曲壳藻-亲缘桥弯藻-条纹小环藻(Cyclotella striata),Ⅴ.卵形菱形藻-具槽直链藻(Melosira sulata)-柱状小环藻(Cyc.stytorum),Ⅵ.条纹小环藻-柱状小环藻,Ⅶ.具槽直链藻-条纹小环藻-卵形菱形藻,Ⅷ.柱状小环藻等8个硅藻组合带。有孔虫群自下而上划分为:Ⅰ.毕克卷转虫变种(Ammonia beccarii var.)-瘦瘪雅得虫(Jadammina macrescens),Ⅱ.毕克卷转虫变种-异地希望虫(Elphidium advenum)-球室刺房虫(Schackoinella globosa),Ⅲ.毕克卷转虫变种-卡纳利拟单拦虫(Haplophragmoides canariensis),Ⅳ.毕克卷转虫变种-异地希望虫,Ⅴ.毕克卷转虫变种-褐色砂粟虫(Miliammina fuasca)。北海外沙泻湖自全新世早期以来经历了河漫滩相→河口沼泽相→河漫滩相→河口沼泽相→河口湾相→半封闭泻湖相→河口湾相→半封闭泻湖相的演化过程。北海外沙泻湖全新世地层可划分为早全新世(10000 aB.P.~8000aB.P.),中全新世(8000aB.P.~2500aB.P.),晚全新世(2500aB.P.~现代)。 |
| 关键词: 全新世泻湖 硅藻 有孔虫 沉积相 |
| DOI： |
| 投稿时间：1999-05-19修订日期：1999-08-06 |
| 基金项目:国家自然科学基金(批准号:49766013)资助和广西自然科学基金匹配项目。 |
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| Diatom,Foraminifera Assemblages and Evolution of Sedimentary Facies in the Holocene Strata of Waisha Lagoon,Beihai |
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Li Guangzhao, Liang Wen, Nong Huaqiong, Liu Jinghe
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| (Guangxi Institute of Oceanograph, 92 East Changqinglu, Beihai, Guangxi, 536000, China) |
| Abstract: |
| Diatom, Foraminifera, Ostracoda fossils and its features of assemblages, evolution of sedimentary facies in Waisha Lagoon, Beihai, were analysed systematically. Strata ages had been discussed by 14C dating. Holocene Diatom fossils of the drill hole could be divided from bottom to top:Ⅰ. Athnanthes crenulata-Cymbella affinis-Cym. lanceolata, Ⅱ. Cym. affinis-Ath. crenulata-Nitzschia cocconeiformis, Ⅲ. Cym. affinis-Ath. crenulata-Diploneis smithii, Ⅳ. Ath. crenulata-Cym.affinis-Cyclotella striata,Ⅴ. Nit. cocconeiformis-Melosira sulata-Cyc.stytorum, Ⅵ. Cyc. striata-Cyc.stytorum, Ⅶ. Mel. sulata-Cyc. striata-Nit. cocconeiformis, Ⅷ. Cyc. stytorum. Foraminifera groups from bottom to top:Ⅰ. Ammonia beccarii var.-Jadammina macrescens, Ⅱ. A.beccarii var.-Elphidium advenum-Schackoinella globosa, Ⅲ. A.beccarii var.-Haplophragmoides canariensis, Ⅳ. A.beccarii var.-E.advenum, Ⅴ. A.beccarii var.-Miliammina fuasca. Since early Holocene Waisha Lagoon, Beihai, underwent revotution:riverine flood-plain → river mouth-marsh→ riverine flood-plain → river mouth-marsh→ estuary→ semi-enclosed lagoon → estuary→ semi-enclosed lagoon. Holocence strata could be divided into early-Holocene (1000 aB. P.~8000 aB. P.), middle-Holocence (8000 aB.P.~2500 aB.P.), late-Holocence (2500 aB. P.~present). |
| Key words: Holocene lagoon diatom foraminifera sedimentary facies |
