| 我国咸化湖泊沉积中钙质超微化石特征及其地质意义 |
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| 引用本文： | 孙镇城,杨革联,乔子真,杨藩,李东明,景民昌.我国咸化湖泊沉积中钙质超微化石特征及其地质意义[J].古地理学报,2002,4(2):56-63. |
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| 作者姓名： | 孙镇城 杨革联 乔子真 杨藩 李东明 景民昌 |
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| 作者单位： | 1.石油大学（北京）资源与信息学院 北京 100220;2.青海油田勘探开发研究院 敦煌 |
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| 基金项目： | 中国石油天然气总公司“九五”攻关项目 (95 0 2 0 8)资助 |
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| 摘 要： | 对我国西北和东北（内蒙古东部）36个地点的新生代-现代陆相咸化湖泊沉积中的433块标本进行了采样分析，在其中15个地点38块标本中发现钙质超微化石10个属：Coccolithus, Reticulofenestra, Cyclicargolithus,Quadrum, Discoaster, Gephyrocapsa, Calcidiscus, Umbilicasphaera,Cotonocyclus, Watznaueria等，多数为原地沉积，也有一部分属于再沉积来源。由此可见，不能笼统地把所有钙质超微化石的发现都当作海相或海侵的证据。陆相咸化湖泊沉积中钙质超微化石的特点是：丰度低，数量稀少；属种分异度低；常与陆相喜盐水生生物共生。第四系和现代陆相咸化湖泊沉积中发现的钙质超微化石属种往往是海相第四系或现代海洋中常见类型。在青海柴达木盆地七个泉构造七心1井中-上始新统下干柴沟组上段岩心中，发现Reticulofenestra bisecta。这是海相中始新世-渐新世沉积中标志化石。看来，利用钙质超微化石进行海、陆相地层对比探索已取得一定进展，但离“统”一级的地层对比还有很大距离。
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| 关 键 词： | 新生代 钙质超微生物 陆相咸化湖泊 海侵 中国 湖泊沉积 钙质超微化石 |
| 文章编号： | 1671-1505(2002)02-0056-08 |
| 修稿时间： | 2001年11月21 |
CHARACTERISTICS AND GEOLOGIC SIGNIFICANCE OF CALCAREOUS NANOFOSSILS IN SEDIMENTS OF TERRESTRIAL SALINIZED LAKES |
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| Sun Zhencheng Yang Gelian Qiao Zizhen Yang Fan Li Dongming Jing Minchang College of Resources and Information,University of Petroleum,Beijing Research Institute of Petroleum Exploration and D.CHARACTERISTICS AND GEOLOGIC SIGNIFICANCE OF CALCAREOUS NANOFOSSILS IN SEDIMENTS OF TERRESTRIAL SALINIZED LAKES[J].Journal of Palaeogeography,2002,4(2):56-63. |
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| Authors: | Sun Zhencheng Yang Gelian Qiao Zizhen Yang Fan Li Dongming Jing Minchang College of Resources and Information University of Petroleum Beijing Research Institute of Petroleum Exploration and D |
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| Institution: | 1.College of Resources and Information, University of Petroleum,Beijing 100220;2.Research Institute of Petroleum Exploration and Development of Qinghai Petroleum Corporation, Duihuang |
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| Abstract: | Ten genera of calcareous nanofossils (Coccolithus,Reticulofenestra, Cyclicargolithus, Quadrum,Discoaster,Gephyrocapsa,Calcidiscus, Umbilicasphaera, Cotonocyclus, Watznaueria) have been found in 38 samples collected from 15 locations in Cenozoic Recent sediments of terrestrial salinized lakes in the northwest and northeast China by analysing 433 samples from 36 places. It was found that most of them were sedimentary deposits and a few of them resedimentary ones. Hence, it is not correct to regard all the appearance of the calcareous nanofossils as the evidence of marine facies or transgression. More evidences are needed. Characteristics of the calcareous nanofossils in the sediments of the salinized lakes are as follows: low abundance and less smalquantity, low species and generic diversity, coexistence with terrestrial saline hydrobioses. The calcareous nanofossils found in Quaternary and present terrestrial salinized lakes are generally the same kinds in modern oceans. Reticulofenestra bisecta , which is an index fossil of marine facies in the Middle Eocene Oligocene, was found in core of Well Qixin 1 in upper part of Lower Ganchaigou Formation (Middle Upper Eocene) in Qigequan structure in Qaidam Basin. Some progresses have been achieved in correlation between marine and terrestrial strata, but it is far from correlation among Series. |
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| Keywords: | Cenozoic calcareous nanofossils terrestrial salinized lakes transgression |
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