晚更新世以来台湾浅滩西北近岸沉积特征与古环境演化

赵东波; 孙荣涛; 蒋恒毅; 李董

doi:10.16562/j.cnki.0256-1492.2020022801

晚更新世以来台湾浅滩西北近岸沉积特征与古环境演化

1.
福建省海岛与海岸带管理技术研究重点实验室，福建海洋研究所，厦门 361013

2.
山东理工大学资源与环境工程学院，淄博 255000

基金项目: 福建省科技计划项目“台湾浅滩西北部沉积环境研究”（2016R1006-2）；福建省海岛与海岸带管理技术研究重点实验室开放课题“晚更新世以来台湾浅滩古环境演化过程研究”（CIMTS-2016-02）；国家自然科学基金“末次冰期以来西太暖池—主流区系温、盐梯度对全球快速气候变化事件的响应”（41576054）

详细信息

作者简介: 赵东波（1979—），男，硕士，副研究员，主要从事海洋地质、海洋沉积学研究，E-mail：68551924@qq.com

通讯作者: 孙荣涛（1980—），男，博士，副教授，主要从事海洋微体古生物与古环境研究，E-mail：rtsun@sdut.edu.cn

中图分类号: P736.21

收稿日期: 2020-02-28

修回日期: 2020-08-31

刊出日期: 2021-04-28

Sedimentary characteristics and paleoenvironmental evolution of the northwest coast of the Taiwan Shoal since Late Pleistocene

1.
Fujian Provincial Key Laboratory of Coast and Island Management Technology Study, Fujian Province, Fujian Institute of Oceanography, Xiamen 361013, China

2.
School of resources & environment engineering, Shandong University of technology, Zibo 255000, China

More Information

Corresponding author: SUN Rongtao, rtsun@sdut.edu.cn

Received Date: 28 February 2020

Revised Date: 31 August 2020

Publish Date: 28 April 2021

摘要

摘要:
对取自台湾浅滩西北部福建东山岛外的浅钻ZK2孔进行了包括AMS¹⁴C测年、粒度、微体古生物、碎屑矿物和黏土矿物等分析。结果表明该孔地层中存在两个明显的海相层和其间的两个陆相层，顶部的海相层为全新世高海平面以来形成的被现代潮流作用改造的现代沉积和残留沉积混合体；底部陆相层为MIS4期低海平面时期形成的河流沉积；中间的细粒沉积层又可划分为下部形成于MIS3期的以潟湖、潮坪和盐沼交替出现的海相沉积层，以及上部形成于MIS3期末到盛冰期出露水面之前的陆上沟谷充填沉积；台湾海峡南部在MIS3期之后发生了明显的构造沉降过程，但是在末次盛冰期海峡南部仍然出露水面之上形成了沉积间断面。本文研究内容为今后在台湾浅滩西北边缘到福建东南近岸区深入开展沉积学、地层学及古环境演化研究提供了新的参考。
- 沉积特征 /
- 古环境演化 /
- 晚更新世 /
- 台湾浅滩
Abstract:
ZK2, a shallow drilling core taken from the northwest Taiwan Shoal off the coast of the Dongshan Island, Fujian Province, is studied for establishing the stratigraphic sequence and paleoenvironmental evolution of the shoal. According to the data of AMS¹⁴C dating, grain size, micro-paleontology and detrital and clay minerals, two marine strata and two terrestrial strata are recognized. The top marine stratum is a mixture of modern sediments and the late Pleistocene relict deposits formed by tidal current since the Holocene high sea level, and the bottom terrestrial layer is a fluvial deposit formed during the MIS4 when the sea level was low. The fine-grained strata in the middle can be further divided into two layers. The lower layer is formed in MIS3 in a frequently changing environment from lagoon, to tidal flat or salt marsh, while the upper layer is the filling deposits in incised valleys formed during the period from MIS3 to the peak of LGM. The southern Taiwan Strait had experienced obvious tectonic subsidence during MIS3, but emerged above the sea level in LGM and left a hiatus or discontinuity behind. This paper provides some new evidence for further research of sedimentology, stratigraphy and paleoenvironmental evolution of the region from the northwestern margin of the Taiwan Shoal to the southeast coastal area of the Fujian Province.
- sedimentary characteristics /
- paleoenvironmental evolution /
- Late Pleistocene /
- Taiwan Shoal

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图 1 台湾浅滩西北部ZK2孔取样站位

Figure 1.

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图 2 ZK2孔粒度参数变化曲线和AMS¹⁴C年代控制点

Figure 2.

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图 3 ZK2孔各沉积单元代表层位粒度概率累积曲线和频率分布曲线

Figure 3.

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图 4 ZK2孔底栖有孔虫、介形类丰度、分异度变化与海平面变化^[19]的关系

Figure 4.

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图 5 ZK2孔底栖有孔虫、介形类优势种相对含量变化

Figure 5.

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图 6 ZK2孔主要重矿物相对含量变化

Figure 6.

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图 7 ZK2孔主要黏土矿物相对含量及伊利石化学指数和结晶度变化

Figure 7.

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表 1 ZK2孔和邻近TWS1208孔AMS¹⁴C测年数据

Table 1. AMS¹⁴C ages from Core ZK2 and adjacent TWS1208

岩芯	层位/m	测试材料	绝对年龄/aBP	日历年/cal. aBP	来源
ZK2	3.5	底栖有孔虫	3780±30	3410	本文
	7.5	底栖有孔虫	4540±30	4393	本文
	17.5	底栖有孔虫	35790±280	39846	本文
	20.5	底栖有孔虫	35910±280	39938	本文
	36.5	木炭	＞43500	＞43500	本文
TWS1208	7.06	贝壳	3210±30	2871	王利波等^[8]
	9.51	贝壳	5400±40	5649	王利波等^[8]
	26.52	贝壳	＞43500	＞43500	王利波等^[8]

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