辽东湾晚第四纪层序地层

陈晓辉; 孟祥君; 李日辉

doi:10.16562/j.cnki.0256-1492.2019042301

辽东湾晚第四纪层序地层

陈晓辉^1,2,,
孟祥君^1,2, ,,
李日辉^1,2

1.
青岛海洋地质研究所，青岛 266071
2.
青岛海洋科学与技术国家实验室，海洋矿产资源评价与探测技术功能实验室，青岛 266071

基金项目: 中国地质调查局地质调查项目“1：25万锦西、营口幅海洋区域地质调查项目”（GZH201400205），“1：25万锦西、日照和霞浦县等图幅海洋区域地质调查项目”（DD20160139），“中国东部海区区域地质志”（DD20190377）

详细信息

作者简介:
陈晓辉（1981-），男，博士，高级工程师，主要从事陆架地层层序与环境地质研究，E-mail:hongzi1982@163.com

通讯作者:
孟祥君（1975—），男，教授级高工，主要从事海洋地球物理调查与研究工作，E-mail: sdqdmxj@126.com

中图分类号: P736.21
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出版历程
- 收稿日期: 2019-04-22
- 修回日期: 2019-07-05
- 网络出版日期: 2020-04-14
- 刊出日期: 2020-03-31

Sequence stratigraphy of the Late Quaternary in Liaodong Bay

CHEN Xiaohui^1,2,,
MENG Xiangjun^1,2, ,,
LI Rihui^1,2

1.
Qingdao Institute of Marine Geology, Qingdao 266071, China
2.
Laboratory for Marine Mineral Resources, National Laboratory for Marine Science and Technology, Qingdao 266071, China

摘要

摘要: 通过对辽东湾高分辨率浅地层剖面声学地层与典型钻孔沉积地层的对比分析，揭示了研究区晚第四纪MIS5以来的地层层序。辽东湾高分辨率浅地层剖面自下而上划定的6个声学地层单元（SU₅、SU₄、SU₃、SU₂、SU₁²、SU₁¹）与钻孔岩芯划分的6个沉积地层单元（DU₅、DU₄、DU₃、DU₂、DU₁²、DU₁¹）具有良好的对应关系。分别与MIS4期、MIS2期低海面时期的沉积间断密切相关的两个层序界面R5、R3，将辽东湾识别出的地层单元自下而上划分为3个层序（SQ3、SQ2、SQ1）。其中SQ3仅识别出上部的海侵体系域与高水位体系域，对应MIS5期海平面相对较高时期的滨浅海相沉积（DU₅）；SQ2自下而上由低水位体系域（MIS4期的河流相与河道充填相沉积（DU₄））与海侵体系域（MIS3期早中期滨海相沉积（DU₃））组成；SQ1自下而上包括低水位体系域（MIS2期的河流相与河道充填相沉积（DU₂））、海侵体系域（全新世早中期滨海相沉积（DU₁²））高水位体系域（全新世高海面以来的浅海相沉积（DU₁¹））。研究区的海侵体系域厚度较薄且变化较小，分布广泛，而低水位体系域厚度与横向分布均变化较大。
- 声学地层 /
- 地层层序 /
- 晚第四纪 /
- 辽东湾
Abstract: High-resolution seismic reflection data are studied in details together with core data in order to determine the stratigraphic sequence of Liaodong Bay since the MIS5 of Late Quaternary. The high-resolution seismic profiles selected from the study area may be subdivided into six seismic units, i.e. SU₅, SU₄, SU₃, SU₂, SU₁², SU₁¹ in descending order, which could be clearly correlated with the six depositional units, DU₅, DU₄, DU₃, DU₂, DU₁², DU₁¹ respectively based on lithology, microfossil assemblages and geochronology of the cores. These units may be grouped into three distinctive sequences, SQ3, SQ2, SQ1 in descending order by two sequence boundaries of R5 and R3 with obvious hiatus, which correspond to the low sea-levels of MIS4 and MIS2, respectively. The SQ3 is the remained upper part of transgressive systems tract (TST) and highstand systems tract (HST), corresponding to DU₅, the littoral and neritic facies of MIS5. SQ2 is composed of lowstand systems tract (LST), fluvial deposits and incised-channel filling facies (DU₄₎ formed in MIS4 plus the TST littoral facies (DU ₃) deposited during Early-Middle MIS3. And the SQ1 is comprised of the LST, DU₂ fluvial deposits to incised-channel filling facies formed in MIS2, TST, DU₁² deposits of littoral facies formed during Early-Middle Holocene, and the HST, DU₁¹ deposits of neritic facies since the highstand sea-level of Holocene. The TSTs is relatively continuous and widely distributed, while LSTs vary considerably in thickness and lateral distribution since MIS5 in Liaodong Bay.
- seismic stratigraphy /
- stratigraphic sequence /
- Late Quaternary /
- Liaodong Bay

HTML全文

图 1 辽东湾浅地层剖面测线与钻孔位置图

Figure 1. Locations of shallow seismic profiles and cores in the Liaodong Bay

下载: 全尺寸图片幻灯片

图 2 辽东湾NW-SE向典型浅地层剖面（Z17线，剖面位置见图1）

Figure 2. NW-SE seismic profile of Line Z17 in Liaodong Bay （see Fig. 1 for location）

下载: 全尺寸图片幻灯片

图 3 辽东湾NW-SE向典型浅地层剖面（Z25线，剖面位置见图1）

Figure 3. SE-NW seismic profile of Line Z25 in Liaodong Bay （see Fig. 1 for location）

下载: 全尺寸图片幻灯片

图 4 辽东湾NW-SE向过LD01孔^[14]典型浅地层剖面（L8线，剖面位置见图1）

Figure 4. NE-SW seismic profile of Line L8 through core LD01 in Liaodong Bay （see location in Fig. 1）

下载: 全尺寸图片幻灯片

图 5 辽东湾SU₄单元厚度（A）与SU₅单元顶界面埋深（B）图

Figure 5. Thickness of unit SU₄（A）and depth of unit SU₅ top boundary（B）in Liaodong Bay

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图 6 辽东湾SU₂（A）与SU₃（B）单元厚度图

Figure 6. Isopach maps of units SU₂（A）and SU₃（B）in Liaodong Bay

下载: 全尺寸图片幻灯片

图 7 辽东湾SU₁¹（A）与SU₁²（B）单元厚度图

Figure 7. Isopach maps of units SU₁¹（A）and SU₁²（B）in Liaodong Bay

下载: 全尺寸图片幻灯片

图 8 辽东湾YKC-2孔沉积地层与过孔浅地层剖面对比（剖面位置见图1）

Figure 8. Correlation between the depositional units of the core YKC-2 and the seismic units from the profile through the core in Liaodong Bay （see Fig. 1 for location）

下载: 全尺寸图片幻灯片

图 9 辽东湾晚第四纪层序地层与海平面变化（Chappell et al^[21]，Lea et al^[22]）的对比

Figure 9. Sequence stratigraphy in Liaodong Bay and its correlation with sea-level fluctuation （Chappell et al^[21],Lea et al^[22]） during Late Quaternary

下载: 全尺寸图片幻灯片

图 10 辽东湾YKC-2孔与周边Bc-1孔^[1]、LDD7孔^[10]地层对比（钻孔位置见图1）

Figure 10. Stratigraphic correlation of core YKC-2 with cores Bc-1^[1] and LDD7^[10] （see Fig. 1 for location）

下载: 全尺寸图片幻灯片

表 1 YKC-2孔光释光年龄

Table 1 OSL ages of borehole YKC-2

样品深度/m	OSL年龄/kaBP
1.96	4.5±0.5*
2.90	14.1±1.4
4.01	15.3±1.5
5.27	12.7±1.3*
5.86	13.4±1.3*
7.00	30.3±3.0
18.47	59.4±5.9
37.15	54.4±5.4*
40.66	76.8±7.7
40.87	70.2±7.0*
44.70	70.6±7.1*
45.30	69.5±7.0*
49.89	＞93.9*
55.27	93.7±9.4*
60.37	91.2±9.1*
61.21	94.4±9.4*
68.05	85.4±8.5*
69.20	＞98.6*
注：*年龄为本文采用年龄。

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