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三水盆地古近纪早期微体生物群及其古环境意义 被引量:6

Early Paleogene Microfossils and their Palaeoenvironmental Implications in Sanshui Basin,South China
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摘要 对三水盆地SB-01钻孔下古近系地层进行了微体化石分析,共发现介形类7属10种,分布于5个层位;轮藻化石9属15种,见于3个层位。根据介形类和轮藻化石的分布、丰度和分异度变化,讨论了三水盆地古近纪早期的古环境变化。分析结果表明,三水盆地古近纪早期可划分为4个环境演化阶段。阶段A(89.0—75.5m):气候较干燥,水体较浅的半咸水环境;阶段B(75.5—53.5m):气候温暖潮湿为主,湖平面上升,水体盐度仍较高;阶段c(53.5—21.0m):温湿-干旱气候条件交替出现,湖平面和水体盐度波动频繁;阶段D(21.0—5.2m):气候温暖湿润为主,水体较深,湖水逐渐淡化,相应于湖盆发育盛期。 Early Paleogene microfossils of core SB-01 in the Sanshui Basin are analyzed in this paper. Ten ostracod species referred to 7 genera and 15 charophyte species referred to 9 genera are identified. Ostracods mainly occur in 5 core intervals and charophytes are only observed in 3 core intervals. Ostracod and charophyte records allow to recognize 4 environmental stages in the Sanshui Basin during the early Paleogene: Stage A (89. 0 - 75.5 m) - dryer climate and shallow brackish waters; Stage B (75.5 - 53.5 m) -warm and humid climate, increased water level and higher salinity; Stage C (53.5 -21.0 m) alternative of humid and arid climate conditions, rapid fluctuations in water depth and salinity and Stage D (21.0 -5.2 m) -prevailing warm and humid climate, lake waters with reduced salinity.
出处 《中山大学学报(自然科学版)》 CAS CSCD 北大核心 2008年第2期114-117,共4页 Acta Scientiarum Naturalium Universitatis Sunyatseni
基金 国家自然科学基金资助项目(40272011) 广东省自然科学基金资助项目(04009757)
关键词 介形类 轮藻 古环境 三水盆地 早古近纪 ostracods charophytes paleoenvironment Sanshui Basin Early Paleogene
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