| 郭立君,胡海博,王林海,李明辰,刘欢,李美玲.北大港湿地晚更新世晚期以来微体古生物组合特征和沉积环境演化[J].矿产勘查,2025,16(3):464-471 |
| 北大港湿地晚更新世晚期以来微体古生物组合特征和沉积环境演化 |
| Characteristics of microbial paleontological assemblages and sedimentary environment evolution in Beidagang wetland since the Late Pleistocene |
| 投稿时间：2024-06-12 |
| DOI：10.20008/j.kckc.202503003 |
| 中文关键词: 晚更新世 微体古生物 沉积环境 渤海湾西岸 北大港湿地 |
| 英文关键词: Late Pleistocene foraminifera and ostracod sedimentary environment west coast of Bohai Bay Beidagang Wetland |
| 基金项目:本文受天津市国土资源和房屋管理局项目“滨海新区地下水及地质环境调查评价”(国土房任〔2015〕1号)和天津市地质矿产勘查开发局项目“天津市湿地生态产品价值实现路径研究”(津地矿科任〔2023〕2号)联合资助。 |
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| 中文摘要: |
| 本文对渤海湾西岸北大港湿地南沈清庄 SDZ06钻孔取微体古生物样品 21个，通过分析鉴定和地层对比，重建了北大港湿地晚更新世晚期以来的沉积环境演化过程，并对微体古生物化石进行种属和丰度变化分析，共划分出 5个化石组合层。Ⅰ:0.9～2.4 m，有孔虫化石以广温广盐种毕克卷转虫变种居多，介形类以潮上带典型中华美花介多见，该层段的沉积环境为滨海低平原，屡受风暴潮海浪影响；Ⅱ:3.5～10.4 m，见较多的瓷质壳有孔虫与比重较大的螺旋同现卷转虫共生，介形类较上个层段略多，以滨海相双壳类居多，加之岩心为块状浅灰色黏土质层，判断为潟湖沉积；Ⅲ:12.8～18.2 m，见较多广温广盐毕克卷转虫变种和瓷质壳湿地种阿卡尼圆形五玦虫有孔虫组合，为泥质带，介形类以滨海相丰满陈氏介居多，沉积环境为滨海湿地；Ⅳ:19.3～27.1 m，见广温广盐毕克卷转虫变种绝对优势的有孔虫组合，系陆相河流边滩沉积环境；Ⅴ:28.4～29.6 m，见典型中华美花介为优势种的介形类化石组合，与广温广盐毕克卷转虫变种共生，综合判断沉积环境为高潮坪潟湖湿地。 |
| 英文摘要: |
| coast of the Beidagang Wetland of the west cast of Bohai Bay. Based on the stratigraphic correlation and analysisand identification of the genera, rebuilt the sedimentary environment evolution process of the Beidagang Wetlandsince the late Late-Pleistocene. Abundances and diversities of microfossils, five fossil assemblage zones are distin-guished.Ⅰ: 0.9-2.4 m, fossils of foraminifera are mostly variants of the wide-temperate and wide-salt Ammoniabeccarii vars. Sinocytheridea impressa are more common in the ostracoda on the tidal zone. From the analysis of thecombined environment of foraminifera and ostracoda and the number of their dominant genera and species, the sedi-mentary environment of this interval is the coastal low plain, repeatedly affected by storm surges and waves. Ⅱ: 3.5-10.4 m, it can be seen that more porcelain shell foraminifera symbiosis with spiral Ammonia annectens, slightlymore ostracods than the previous layer, mainly coastal bivalves. In addition, the core is a massive light gray clayylayer, which is judged to be a lagoon sedimentary environment. Ⅲ: 12.8-18.2 m, there are many wide-temperateand wide-salt Ammonia beccarii vars. and the porcelain-shell wetland species Qingueloculina akneriana rotunda, itis mud zone. Tanella opima is mostly in the ostracod, the sedimentary environment is coastal wetland. Ⅳ: 19.3-27.1m, Ammonia beccarii vars. are absolutely dominant foraminifera combination, the sedimentary environment is terres-trial river beach. Ⅴ: 28.4-29.6 m, Sinocytheridea impressa is the dominant species in ostracod, symbiosis with Am-monia beccarii vars. Comprehensively judge that the sedimentary environment is high tide flat lagoon wetland. |
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