苏北LYK钻孔千年以来的沉积记录及古环境演化

齐晓婕; 黄宝琦; 秦亚超; 刘嘉栋

doi:10.16562/j.cnki.0256-1492.2020091901

苏北LYK钻孔千年以来的沉积记录及古环境演化

1.
北京大学造山带与地壳演化教育部重点实验室，北京 100871

2.
青岛海洋地质研究所，青岛 266071

基金项目: 国家自然科学基金“晚上新世—早更新世西太平洋底栖有孔虫群演变的古海洋学意义及其与深层海水环流变化的关系”（41376043）；中国地质调查局项目“1∶25万日照幅、连云港幅海洋区域地质调查”（GZH201400206、DD20160139、DD20190236，DD2019037）；广东省基础与应用基础研究基金“晚上新世—早更新世亚南极太平洋海区古环流演化”（2019A1515110896）

详细信息

作者简介: 齐晓婕(1996—)，女，硕士研究生，古生物与地层学专业，E-mail：qixiaojie7777@126.com

通讯作者: 黄宝琦(1972—)，女，副教授，硕士生导师，主要从事古海洋学与古气候学研究。E-mail：bqhuang@pku.edu.cn

中图分类号: P736.22

收稿日期: 2020-09-19

修回日期: 2020-12-10

刊出日期: 2021-06-28

Sedimentary records and paleo-environmental evolution of core LYK in northern Jiangsu province for a thousand of year.

1.
Key Laboratory of Orogenic Belts and Crustal Evolution, Ministry of Education, Peking University, Beijing 100871, China

2.
Qingdao Institute of Marine Geology, Qingdao 266071, China

More Information

Corresponding author: HUANG Baoqi, bqhuang@pku.edu.cn

Received Date: 19 September 2020

Revised Date: 10 December 2020

Publish Date: 28 June 2021

摘要

摘要:
对废黄河水下三角洲北翼LYK钻孔微体生物群的分布特征及属种组合进行研究，共鉴定底栖有孔虫50属67种，介形类30属46种，运用Q型聚类分析，将钻孔内底栖有孔虫划分为5个组合，并结合AMS¹⁴C测年结果和沉积物粒度特征，恢复了研究区域千年以来的沉积环境演化：在黄河流入前，研究区发育粒度较细、分选较好的陆架沉积，微体生物群组合接近正常海相；在黄河夺淮入海后，研究区开始接受巨量的粗颗粒沉积物，分选变差，出现了大量近岸半咸水属种的有孔虫和介形虫，沉积环境从典型的浅海向三角洲前缘演变；直到黄河北归后，大量泥沙供给断绝，在波浪和潮流的共同作用下，研究区经历了侵蚀和再沉积过程，沉积物砂泥比升高，微体生物群丰度和分异度急剧下降，广盐类微体生物群增加；随着侵蚀中心逐渐南移，研究区动力条件趋于稳定，前期形成的侵蚀洼地逐渐接受径流和潮流的双向沉积，出现大量浮游有孔虫等异地分子；近年来，伴随波浪和潮汐的改造加工，研究区逐渐形成了趋于平缓的夷平面，由动荡的滨岸逐渐过渡到现今稳定的浅海相沉积环境。
- 废黄河三角洲 /
- 粒度分析 /
- 有孔虫 /
- 介形虫 /
- 古环境
Abstract:
Quantitative study of micropaleontology is carried out for the core LYK drilled at the northern part of the abandoned Yellow River delta. 106 benthic foraminiferal species of 68 genera and 46 ostracod species of 30 genera are discovered. By Q-mode hierarchical cluster analysis, the foraminifera found can be divided into five assemblages. AMS¹⁴C dating and grain size data are adopted to reconstruct the environmental evolution over the past millennia. The results suggest that the study area was dominated by fine-grained and well-sorted shelf sediments and the microbiota assemblage was close to normal marine facies before the Yellow River poured into the sea. The study area started receiving enormous coarse-grained sediments with worse sorting after the Yellow River seized the Huaihe river channel and entered the sea. There appeared a large number of foraminifers and ostracods of nearshore brackish water genus, and the sedimentary environment was changed from a typical shallow sea to a delta-front. Once the Yellow River moved to the north, large sediment supply was cut off. Under the joint action of waves and tidal currents, the study area was suffered from erosion and redeposition, and the sand/mud ratio was thus increased. The abundance and diversity of microbiota declined sharply, while the wide salinity microbiota increased. With the gradual southward movement of the erosional center, the dynamic conditions of the study area became stabilized. The erosional depressions formed in the early stage gradually accepted sediments from both the runoff and tidal current, and a large number of floating foraminifers and off-site molecules appeared. In recent years, along with the reworking of waves and tides, the study area gradually becomes flatter and changes from a turbulent shoreline to a stable shallow sea.
- the abandoned Yellow River delta /
- grain size analysis /
- foraminifera /
- ostracod /
- paleo-environment

HTML全文

图 1 LYK钻孔位置及苏北岸线变迁^[9]

Figure 1.

下载: 全尺寸图片幻灯片

图 2 LYK钻孔粒度参数垂向变化

Figure 2.

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图 3 LYK钻孔聚类结果

Figure 3.

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图 4 LYK孔微体古生物特征及特征属种变化

Figure 4.

下载: 全尺寸图片幻灯片

图 5 废黄河三角洲LYK钻孔综合参数及沉积环境恢复

Figure 5.

下载: 全尺寸图片幻灯片

表 1 LYK站位壳类AMS¹⁴C测年结果

Table 1. AMS¹⁴C dating of core LYK

实验室编号	深度/cm	测年材料	直接测定值	常规年龄/aBP	日历年龄/AD
Beta-493151	1060～1064	贝壳	670±30	1100±30	1219±170
Beta-493152	1206～1210	贝壳	180±30	580±30	1649±158
Beta-493153	1830～1834	贝壳	440±30	800±30	1485±165
Beta-493154	1956～1960	贝壳	890±30	1320±30	1010±195

下载: 导出CSV

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