[1]黄 屏,张 珂,余章馨,等.晚更新世以来珠江三角洲地层层序再分析及新构造运动新认识[J].华南地震,2021,41(04):10-20.[doi:10.13512/j.hndz.2021.04.02]
 HUANG Ping,ZHANG Ke,YU Zhangxin,et al.Reanalysis of the Stratigraphic Sequence and New Understanding of Neotectonic Movement of the Pearl River Delta Since the Late Pleistocene[J].,2021,41(04):10-20.[doi:10.13512/j.hndz.2021.04.02]
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晚更新世以来珠江三角洲地层层序再分析及新构造运动新认识()
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华南地震[ISSN:1006-6977/CN:61-1281/TN]

卷:
41
期数:
2021年04期
页码:
10-20
栏目:
地震科学研究
出版日期:
2021-12-15

文章信息/Info

Title:
Reanalysis of the Stratigraphic Sequence and New Understanding of Neotectonic Movement of the Pearl River Delta Since the Late Pleistocene
文章编号:
1001-8662(2021)04-0010-11
作者:
黄 屏1张 珂1余章馨2梁 浩1李忠云1陈 震1汤永杰1曾 强3
1.中山大学地球科学与工程学院/广东省地球动力作用与地质灾害重点实验室,广东 珠海 519082;2.华南师范大学地理科学学院,广州 510631;3.广东中大深地科学研究院,广州 510275
Author(s):
HUANG Ping1ZHANG Ke1YU Zhangxin2LIANG Hao1LI Zhongyun1CHEN Zhen1TANG Yongjie1ZENG Qiang3
1.Guangdong Provincial Key Lab of Geodynamics and Geohazards , School of Earth Sciences and Engineering , Sun Yat-Sen University , Zhuhai 519082, China;2.School of Geography , South China Normal University , Guangzhou 510631, China;3.GDZD Institute on Deep-Earth Sciences , Guangzhou 510275, China
关键词:
珠江三角洲层序地层学新构造海面变化深海氧同位素阶段
Keywords:
Pearl River DeltaSequence stratigraphyNotectonicsSea level changesMarine isotope stage
分类号:
P511.2
DOI:
10.13512/j.hndz.2021.04.02
文献标志码:
A
摘要:
普遍认为珠江三角洲存在上、下两个海侵—海退旋回,对下旋回有30~50ka(MIS3)和约120ka(MIS5)之争。通过近1万个钻孔资料,提取了20余个典型钻孔岩心数据,运用生物地层学、年代地层学和层序地层学等方法,重新划分了层序及沉积相,并与深海氧同位素阶段进行对比,识别出SB3(基岩深度风化壳)、SB2(花斑黏土层2)和SB1(花斑黏土层1)等层序边界,分别对应于MIS6,4(或4~2),2等3次低海面期,并将三角洲沉积分出下、中、上3层。认为250ka以来珠江三角洲最大平均下沉速率约为0.34mm/a。下沉前,为星罗棋布的低矮山地+宽阔台地+“过路河”的亚热带准平原地貌景观,掀斜下沉后,被厚度不等的晚更新世以来松散沉积层覆盖。
Abstract:
Previous works suggested that the Pearl River Delta(PRD)only archived the last two transgression sequences in several tens of the Pleistocene eustatic fluctuations. The wide disparity on the time and sea level of MIS3(30-50 ka)and MIS5(120 ka)results in very different interpretations on coastal migration. To address this issue,the paper examined more than 10 000 borehole information(from urban geological survey,published data and the typical borehole logging), established the borehole dataset and applied biostratigraphy, sequence stratigraphy and isotope chronostratigraphy to reconstruct a new late Quaternary stratigraphic framework. On the basis of the borehole analyses, three remarkable sequence boundaries are recognized that represent lowstands in MIS2,MIS4(or MIS4-2)and MIS6,denoted SB1(mottled clay 1),SB2(mottled clay 2)and SB3(vermicular red earth, laterite, deep-weathering pre-Cenozoic rocks or regolith soil), respectively. These three sequence boundaries subdivide three marine sequences that corresponding to MIS1, MIS3 and MIS5, rather than two transgression sequences in previous work. It is believed that the maximum average subsidence rate of the Pearl River Delta since 250 ka is about 0.34 mm/a. Before the sinking, it was a subtropical peneplain landscape of scattered low mountains+wide platform+"by-pass river". After tilting and sinking,it was covered by loose.

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备注/Memo

备注/Memo:
收稿日期:2021-05-01
基金项目:国家自然科学基金项目(41572178,41802225);广东省财政厅广东省地质灾害防治专项(2017201);广东省引进人才创新团队(2016ZT06N331)联合资助。
作者简介:黄屏(1995-),女,硕士研究生,主要从事第四纪地质学研究。E-mail:huangp67@mail2.sysu.edu.cn
通信作者:梁浩(1989-),男,博士,主要从事构造地质学研究。E-mail:liangh27@mail2.sysu.edu.cn
更新日期/Last Update: 2021-12-15