| 渤海湾西南部平原DC01孔晚更新世以来的地质环境变化 |
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| 引用本文： | 李建芬,王福,陈永胜,方晶,商志文,田立柱,施佩歆,姜兴钰,王宏.渤海湾西南部平原DC01孔晚更新世以来的地质环境变化[J].地质通报,2016,35(10):1590-1599. |
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| 作者姓名： | 李建芬 王福 陈永胜 方晶 商志文 田立柱 施佩歆 姜兴钰 王宏 |
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| 作者单位： | 1. 中国地质调查局天津地质调查中心, 天津 300170;2. 中国地质调查局泥质海岸带地质环境重点实验室, 天津 300170;3. 天津师范大学城市与环境科学学院, 天津 300387 |
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| 基金项目： | 国家自然科学基金项目（批准号:41372173、41476074）和中国地质调查局项目（编号:1212011120169、12120113005800） |
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| 摘 要： | 通过对渤海湾西南部平原DC01孔的岩石地层学、生物地层学及年代地层学和地球化学研究,重建了该地区自晚更新世以来的地质环境演化过程。全新世之前,研究区经历了由河流-盐沼-潮间带上部/低盐沼-河口湾-泻湖-淡化泻湖的环境转化过程;进入全新世之后,该区经历了由湖沼到河流的环境转化过程。埋深22.4~12.7m发育近10m厚的弱海相沉积,AMS~(14)C年龄表明,该层沉积形成时间早于4.35ka cal BP,可能属于MIS 3早期(6.0~5.5ka cal BP)或更早的MIS 5期(12~8ka cal BP)。恢复了该时期的相对古海面,最高可达-13.31m。DC01孔缺失MIS 4~2或MIS 2时期的沉积。
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| 关 键 词： | 渤海湾西南部 晚更新世 有孔虫 AMS 14C年龄 沉积环境 |
| 收稿时间： | 2016/5/19 0:00:00 |
| 修稿时间： | 2016/9/5 0:00:00 |
Geo-environmental changes since the Late Pleistocene recorded by Borehole DC01, the southwest plain of Bohai Bay |
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| LI Jianfen,WANG Fu,CHEN Yongsheng,FANG Jing,SHANG Zhiwen,TIAN Lizhu,SHI Peixin,JIANG Xingyu and WANG Hong.Geo-environmental changes since the Late Pleistocene recorded by Borehole DC01, the southwest plain of Bohai Bay[J].Geologcal Bulletin OF China,2016,35(10):1590-1599. |
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| Authors: | LI Jianfen WANG Fu CHEN Yongsheng FANG Jing SHANG Zhiwen TIAN Lizhu SHI Peixin JIANG Xingyu and WANG Hong |
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| Institution: | 1. Tianjin Center, China Geological Survey, Tianjin 300170, China;2. Key Laboratory of Muddy Coast Geo-environment, China Geological Survey, Tianjin 300170, China;3. College of Urban and Environmental Sciences, Tianjin Normal University, Tianjin 300387, China |
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| Abstract: | Geo-environmental history since the Late Pleistocene was reconstructed by the study of litho-, bio- and chronostratigraphy and geochemistry of Borehole DC01 drilled in the southwest plain of Bohai Bay. Before the Holocene, the study area had experienced environmental transformation of river- salt marsh- upper intertidal/lower salt marsh-estuary-lagoon-desalinated lagoon environments. During the Holocene, the area changed from lacustrine to fluvial environment. The less marine- influenced sediments, nearly 10m thick, were found at the depth of 22.4~12.7m. AMS 14C ages show that such sediments were formed earlier than 4.35ka cal BP, thus probably during the earlier stage of MIS 3 (6.0~5.5ka cal BP) or even MIS 5 (12~8ka cal BP). Relative sea level for this period was also reconstructed with a highest elevation at -13.31m. Borehole DC01 lacks the sediments deposited in the period of MIS 4~2 or MIS 2. |
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| Keywords: | southwest Bohai Bay Late Pleistocene foraminifera AMS 14C age sedimentary environment |
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