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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
引用本文:谢叶彩,刘春莲,商建林,周洋. 三水盆地古近纪早期微体生物群及其古环境意义[J]. 中山大学学报(自然科学版), 2008, 47(2): 114-117
作者姓名:谢叶彩  刘春莲  商建林  周洋
作者单位:1. 广东省地质调查院,广东,广州,510080
2. 中山大学地球科学系,广东,广州,510275
3. 广州海洋地质调查局,广东,广州,510275
基金项目:国家自然科学基金 , 广东省自然科学基金
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(89.0~75.5 m):气候较干燥,水体较浅的半咸水环境;阶段B(75.5~53.5 m):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 ~ 21.0 m):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 ~ 5.2 m):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。

关 键 词:介形类  轮藻  古环境  三水盆地  早古近纪
文章编号:0529-6579(2008)02-0114-04
收稿时间:2007-06-26;
修稿时间:2007-06-26

Early Paleogene Microfossils and their Palaeoenvironmental Implications in Sanshui Basin, South China
XIE Ye-cai,LIU Chun-lian,SHANG Jian-lin,ZHOU Yang. Early Paleogene Microfossils and their Palaeoenvironmental Implications in Sanshui Basin, South China[J]. Acta Scientiarum Naturalium Universitatis Sunyatseni, 2008, 47(2): 114-117
Authors:XIE Ye-cai  LIU Chun-lian  SHANG Jian-lin  ZHOU Yang
Affiliation:(1.Guangdong Geological Survey, Guangzhou 510080,China; 2.Deparment of Geosciences, Sun Yat sen University, Guangzhou 510275,China; 3.Guangzhou Marine Geological Survey,Guangzhou 510075,China)
Abstract: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.
Keywords:ostracods  charophytes  paleoenvironment  Sanshui Basin  Early Paleogene
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