涌潮沉积揭示长江河口湾全新世最高海面

刘雨佳; 韩志勇; 李徐生; 泮燕红; 杨倩倩; 周玉文

doi:10.16562/j.cnki.0256-1492.2022030601

涌潮沉积揭示长江河口湾全新世最高海面

1.
南京大学地理与海洋科学学院，南京 210023

2.
南京大学地球科学与工程学院，南京 210023

基金项目: 国家重点研发计划项目“过去气候变化定量重建方法和我国区域气候重建”（2016YFA0600500）

详细信息

作者简介: 刘雨佳（1997—），女，硕士研究生，主要从事地貌与古气候研究，E-mail：975914232@qq.com

通讯作者: 韩志勇（1968—），男，副教授，主要从事地貌与古气候研究，E-mail：zyhan@nju.edu.cn

中图分类号: P736.2

收稿日期: 2022-03-06

修回日期: 2022-04-18

录用日期: 2022-04-18

刊出日期: 2022-06-28

The sea-level highstand of the Changjiang River estuary in the Holocene revealed from tidal bore deposits

1.
School of Geography and Ocean Science, Nanjing University, Nanjing 210023, China

2.
School of Earth Sciences and Engineering, Nanjing University, Nanjing 210023, China

More Information

Corresponding author: HAN Zhiyong, zyhan@nju.edu.cn

Received Date: 06 March 2022

Revised Date: 18 April 2022

Accepted Date: 18 April 2022

Publish Date: 28 June 2022

摘要

摘要:
海面变化对沿海地区的自然环境和社会经济有着重要影响，了解过去海面变化规律可以为预测未来海面上升情景提供参考依据。以长江古河口湾湾顶附近的扬州市昌建广场建筑工地所揭示的自然沉积剖面（CJGC剖面）为研究对象，通过详细调研，在剖面下部发现了保存有海相贝壳的涌潮沉积，为研究全新世最高海面和最大海侵提供了绝佳的地质材料。通过系统的沉积相与光释光（OSL）年代学研究，重建了古河口湾中全新世以来沉积环境的变化过程。结果表明，该地点中全新世以来经历了从陆相→潮滩→河口沙坝→河漫滩的沉积环境变迁，清晰显示了由海侵到海退的变化过程。OSL测年数据表明长江河口全新世最高海面和河口湾湾顶最大海侵出现的年代约为5.6 ka，当时对应的海面高度不低于海拔1.3 m，这一时期的高海面在世界多地均有记录。
- 河口湾 /
- 海面变化 /
- OSL /
- 涌潮沉积 /
- 长江三角洲
Abstract:
Sea level changes have an important impact on the natural environment and community economy of coastal areas. Understanding the evolution of sea level in the past could help predict the future sea level rising. In this study, a natural Holocene soil outcrop (CJGC profile) was scrutinized. The profile was located in a construction site of Changjian Square in Yangzhou City, east Jiangsu Province in ancient estuary of the Yangtze River. The tidal bore deposits contain euryhaline mollusc shells in the lower part of the profile, which provides excellent geological materials for studying the sea-level highstand and the maximum transgression in the Holocene. In addition, we studied the sedimentary facies and conducted optically stimulated luminescence (OSL) dating, from which the evolution of sedimentary environment in the study area since the middle Holocene was reconstructed. Results show that this site has undergone sedimentary environmental changes of land →tidal beach→river mouth bar→floodplain, which clearly shows a change from transgression to regression. The OSL ages show that the sea-level highstand and the maximum transgression of ancient Changjiang River estuary in the Holocene appeared at ~5.6 ka in elevation no less than 1.3 m above sea level, which is consistent with the sea-level highstand of the same period found elsewhere in many places of the world.
- estuary /
- sea level change /
- OSL /
- tidal bore deposit /
- Yangtze River Delta

HTML全文

图 1 CJGC剖面和贝壳沙堤的位置以及推测的古河口湾岸线

Figure 1.

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图 2 CJGC剖面及其沉积单元划分

Figure 2.

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图 3 CJGC剖面的OSL年龄、沉积相以及解译的沉积环境

Figure 3.

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图 4 CJGC剖面各沉积单元的沉积特征

Figure 4.

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图 5 CJGC剖面中的贝壳

Figure 5.

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表 1 CJGC剖面光释光样品测年结果

Table 1. OSL dating results of the samples from CJGC profile

样品号	埋深/cm	U/10^-6	Th/10^-6	K/%	总剂量/Gy	剂量率/(Gy/ka)	年龄/ka
CJGC-0.3m	30	2.56	15.28	1.90	1.19 ± 0.39	3.69 ± 0.11	0.32 ± 0.11
CJGC-0.9m	90	2.17	13.21	1.83	0.69 ± 0.33	3.49 ± 0.09	0.20 ± 0.10
CJGC-1.4m	140	2.30	13.29	1.86	7.97 ± 0.50	3.26 ± 0.12	2.45 ± 0.18
CJGC-2.0m	200	2.13	11.53	1.60	13.18 ± 1.11	2.95 ± 0.09	4.47 ± 0.40
CJGC-3.0m	300	1.81	11.04	1.66	12.48 ± 2.50	2.95 ± 0.08	4.23 ± 0.85
CJGC-3.4m	340	1.73	9.29	1.62	12.11 ± 2.00	2.72 ± 0.08	4.45 ± 0.74
CJGC-4.3m	430	1.80	10.89	1.61	12.31 ± 0.98	2.85 ± 0.08	4.32 ± 0.36
CJGC-5.3m	530	2.15	12.23	1.60	13.47 ± 1.93	2.84 ± 0.10	4.74 ± 0.70
CJGC-5.7m	570	2.21	13.18	1.61	16.53 ± 4.39	2.94 ± 0.10	5.63 ± 1.51
CJGC-6.1m	610	2.61	14.83	1.53	17.26 ± 1.69	3.08 ± 0.10	5.60 ± 0.58
CJGC-6.5m	650	1.84	12.50	1.10	＞191.94	2.34 ± 0.08	＞82

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