松辽盆地海侵事件——松科1井钙质超微化石新证据
Seawater incursion event in Songliao Basin: New evidence from calcareous nannofossils of SK-1
查看参考文献35篇
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文摘
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松辽盆地作为中国最大的陆相含油气盆地,是否发生过海水侵入一直存在争议,化石能为该科学问题提供直接解释。在松科1井嫩江组一、二段发现了少量的钙质超微化石,初步鉴定出Calculites obscurus,Calculites ovalis,Quadrum sp.,Micula sp.等属种。上述钙质超微化石广泛分布于晚白垩世海相地层中,通过与国际标准海相化石的对比,将嫩江组一段中、下部的时代限定为Turonian 晚期—Maastrichtian 期。松辽盆地嫩江组一、二段下部的钙质超微化石保存总体一般,有一定的多样性,具有海相钙质超微化石的特征。松科1井钙质超微化石的分布、古生态及其与有孔虫化石的对应关系表明,松辽盆地嫩江组一段中-下部、二段下部沉积期湖泊水域广阔,全球海平面较高,间歇性的海水侵入事件导致西北太平洋中的钙质超微浮游生物和有孔虫等海洋生物被带入松辽盆地。 |
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其他语种文摘
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The Songliao Basin is the largest non-marine oil-bearing basin in China. Due to the absence of sufficient evidence, the hypothesis of seawater incursion(s) into the Songliao Basin remains controversial. Marine fossil materials can provide direct explanations. More recently, a few calcareous nannofossils were discovered from units 1 and 2 of the Nenjiang Formation in drill hole SK-1. In these fossils, some taxa have been positively identified, namely Calculites obscurus, Calculites ovalis, Quadrum sp., and Micula sp. They were distributed in marine environment of the Cretaceous. Based on comparisons of the calcareous nannofossil assemblages from global records, the age of units 1 of the Nenjiang Formation seems to have spanned from the latest Turonian to Maastrichtian. The nannofossils from the Songliao Basin have the marine origin, characterized by common diversity and abundance. The distribution and paleoecology of the calcareous nannofossils as well as the co-existing foraminifera in the SK-1 provide further evidence for seawater incursion events in the Songliao Basin. The authors hold that periodical seawater incursion(s) brought calcareous nannofossils and foraminifera into the Songliao Basin during sedimentation of units 1 and 2 of the Nenjiang Formation, when both lake and sea were at high level. |
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来源
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地质通报
,2016,35(6):866-871 【核心库】
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关键词
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钙质超微化石
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海水侵入
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松辽盆地
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松科1井
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嫩江组
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白垩纪
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地址
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中国地质大学(北京), 生物地质与环境地质国家重点实验室;;现代古生物学与地层学国家重点实验室, 北京, 100083
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大庆油田勘探开发研究院, 黑龙江, 大庆, 163712
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中国地质大学(北京), 生物地质与环境地质国家重点实验室, 北京, 100083
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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1671-2552 |
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学科
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地质学;古生物学 |
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基金
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中国科学院南京地质古生物研究所现代古生物学和地层学国家重点实验室基金
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国土资源部中国地质调查局项目
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国家973计划
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国家自然科学基金项目
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文献收藏号
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CSCD:5738360
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