| 陈亮，谢叶彩，王正庆，马闯.三水盆地SB-01孔微体古生物群的组合特征及古新统—始新统界线探讨[J].南华大学学报(自然科学版),2011,25(3):13~19.[CHEN Liang1,2,XIE Ye-cai3,WANG Zheng-qing2,MA Chuang4.Characteristics of Microfossils Assemblages of Core SB-01 fromSanshui Basin and Discussion of Paleocene-eocene Boundary[J].Journal of University of South China(Science and Technology),2011,25(3):13~19.] |
| 三水盆地SB-01孔微体古生物群的组合特征及古新统—始新统界线探讨 |
| Characteristics of Microfossils Assemblages of Core SB-01 fromSanshui Basin and Discussion of Paleocene-eocene Boundary |
| 投稿时间：2011-05-10 |
| DOI： |
| 中文关键词: 微体古生物群 组合特征 古新统—始新统界线 古新世—始新世最热事件 三水盆地 |
| 英文关键词:microfossils assemblage characteristics paleocene-eocene boundary paleocene-eocene thermal maximum SanShui Basin |
| 基金项目:国家自然科学基金资助项目（40272011）；国家自然科学重点基金资助项目（40331007） |
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| 中文摘要: |
| 本文分析了三水盆地SB-01孔微体古生物群的组合特征，结合全岩碳酸盐碳、氧同位素数据探讨了古新统—始新统界线在该孔中的具体层位.介形类化石分为两个组合，即Eucypris sanshuiensis组合（89.0-73.38 m）和Sinocypris nitela-Cyprois buxinensis-Limnocythere honggangensis组合（73.38-0 m）.前者属种单调，丰度低，后者前期和中期属种单调，丰度低，而后期属种相对较为丰富，丰度快速上升；轮藻化石也可分为两个组合，即Peckichara subspherica-Rhabdochara jiangduensis组合（89.0-73.38 m）和Gyrogona qianjiangica-Obtusochara brevicylindrica组合（73.38-53.75 m）.前者属种丰富，丰度高，化石个体较大，后者属种单调，丰度很低，化石个体较小.在孔深73.38 m处，微体古生物群发生重大更替，且全岩碳酸盐碳同位素（下降幅度大于3.0 ‰）、氧同位素值均在此处发生突变，这与古新世—始新世最热事件（PETM）时期的地质记录相一致，因而认为三水盆地古新统—始新统界线在孔深73.38 m处. |
| 英文摘要: |
| Characteristics of microfossils assemblages of core SB-01 from Sanshui Basin have been analysised in this paper.Based on micropaleontological study and data from carbon and oxygen isotopes of bulk carbonates,which depth of Paleocene-Eocene boundary from the core was discussed.Ostracode assemblages include the Sinocypris nitela-Cyprois buxinensis-Limnocythere honggangensis assemblage(89.0-73.38 m) with few species and low abundance and the Sinocypris nitela-Cyprois buxinensis-Limnocythere honggangensis assemblage(73.38-0 m) with few species and low abundance during early and middle the core deposition and relatively many species and abundance increasing quickly of the late time of the core deposition;Charophyte assemblages contain the Peckichara subspherica-Rhabdochara jiangduensis assemblage (89.0-73.38 m) with rich species,high abundance and large sizes of fossils and the Gyrogona qianjiangica-Obtusochara brevicylindrica assemblage (73.38-53.75 m) with few species,low abundance and small sizes of fossils.At 73.38 m core depth,the great changes of microfossils assemblages and carbon isotopes values(decrease by more than 3.0 ‰) and oxygen isotopes values of bulk carbonates take place,which consist with the geological records of the Paleocene-Eocene Thermal Maximum (PETM).Hence,Paleocene-Eocene boundary of SanShui Basin should be roughly placed at 73.38 m core depth. |
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