渤海海峡BHS01孔沉积物磁性地层学研究

doi:10.19657/j.geoscience.1000-8527.2019.02.07

现代地质 ›› 2019, Vol. 33 ›› Issue (02): 315-324.DOI: 10.19657/j.geoscience.1000-8527.2019.02.07

渤海海峡BHS01孔沉积物磁性地层学研究

孙军¹^,²^,³(), 杨慧良¹^,², 何磊¹^,², 褚宏宪¹^,²(), 路月¹^,²^,³, 李攀峰¹^,², 刘长春¹^,², 祁江豪¹^,², 强小科⁴

1.中国地质调查局青岛海洋地质研究所,山东青岛 266071
2.海洋矿产资源评价与探测技术功能实验室青岛海洋科学与技术试点国家实验室,山东青岛 266071
3.中国地质大学(北京) 海洋学院,北京 100083
4.中国科学院地球环境研究所黄土与第四纪地质国家重点实验室,陕西西安 710075

收稿日期:2018-12-08 修回日期:2019-03-08 出版日期:2019-05-08 发布日期:2019-05-08
通讯作者: 褚宏宪
作者简介:褚宏宪,男,教授级高级工程师,1973年出生,海洋地球物理专业,从事海洋地球物理调查与研究。Email: chx-8@163.com。
孙军,男,研究实习员,1989年出生,海洋地质专业,从事海洋地质、磁性地层学、旋回地层学研究。Email: sunjun607@126.com。
基金资助:
中国地质调查局项目(DD20191003);中国地质调查局项目(DD20189643);中国地质调查局项目(DD20160147);中国地质调查局项目(DD20190365);国家自然科学基金项目(41330964);国家自然科学基金项目(41606083)

Quaternary Magnetostratigraphy Record in Sediments from Borehole BHS01 in the Bohai Strait

SUN Jun¹^,²^,³(), YANG Huiliang¹^,², HE Lei¹^,², CHU Hongxian¹^,²(), LU Yue¹^,²^,³, LI Panfeng¹^,², LIU Changchun¹^,², QI Jianghao¹^,², QIANG Xiaoke⁴

1. Qingdao Institute of Marine Geology, China Geological Survey, Qingdao, Shandong 266071, China
2. Laboratory for Marine Mineral Resources, Qingdao National Laboratory for Marine Science and Technology, Qingdao, Shandong 266071, China
3. School of Ocean Sciences, China University of Geosciences, Beijing 100083, China
4. State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi’an,Shaanxi 710075, China

Received:2018-12-08 Revised:2019-03-08 Online:2019-05-08 Published:2019-05-08
Contact: CHU Hongxian

摘要/Abstract

摘要：

磁性地层学研究是建立渤海地区第四纪沉积序列地层年代框架的主要技术手段之一。通过对渤海海峡地区BHS01孔(孔深121.3 m)进行详细的磁性地层学研究,结果表明: BHS01孔岩心记录了布容(Brunhes)正极性时至松山(Matuyama)负极性时底部,包括贾拉米洛(Jaramillo)和奥尔都维(Olduvai)正极性亚时。早、中更新世界线即布容(Brunhes)正极性时/松山(Matuyama)负极性时界限(B/M)深度位于该钻孔的46.4 m处。根据沉积速率,推测钻孔底部121.3 m处的年龄约2.25 Ma。综合沉积物的岩性、磁性及沉积速率变化特征,将BHS01孔沉积物记录的区域沉积过程自下而上划分为3个阶段:阶段Ⅰ(2.25~1.46 Ma)以河流相沉积为主;阶段Ⅱ(1.46~0.78 Ma)为稳定的湖泊相沉积;阶段Ⅲ(0.78~0 Ma)发育海陆交互相沉积。这一研究为该钻孔提供了可靠的年代标尺,为渤海海峡及邻区第四纪地层的划分对比和沉积演化过程提供了新的依据。

关键词: 渤海海峡, BHS01孔, 磁性地层学, 第四纪

Abstract:

Magenetostratigraphy is an effective method to establish reliable geochronological framework, which is critical for reconstructing long-term history of climatic and environmental changes in the past. A detailed palaeomagenetism study on sediments from borehole BHS01 (121.3 m) which is located in the Bohai Strait has been carried out. The results show that the core from the borehole consists of three normal magnetozones which can be correlated to Brunhes, Jaramillo, Olduvai. The basal age of the core is estimated at about 2.25 Ma by the extrapolation of the sedimentation rate in the Matuyama Chron. The Brunhes/Matuyama boundary was found at the core depth of 46.4 m. Thus, through the comprehensive analysis of lithologic, magnetic and sedimentary rate characteristics, we divide the evolutional process of BHS01 into three sedimentary phases: phaseⅠ(2.25 to 1.46 Ma) mainly develops in a fluvial sedimentation; phaseⅡ(1.46 to 0.78 Ma) is accompanied with a stable lacustrine sedimentation; and phaseⅢ(0.78 to 0 Ma) develops in a marine and terrestrial sedimentation. Our results provide a reliable chronological framework for the borehole, facilitating the stratigraphic division and evolutional process of the Quaternary in the Bohai Strait and its neighboring regions.

Key words: Bohai Strait, borehole BHS01, magenetostratigraphy, Quaternary

中图分类号:

孙军, 杨慧良, 何磊, 褚宏宪, 路月, 李攀峰, 刘长春, 祁江豪, 强小科. 渤海海峡BHS01孔沉积物磁性地层学研究[J]. 现代地质, 2019, 33(02): 315-324.

SUN Jun, YANG Huiliang, HE Lei, CHU Hongxian, LU Yue, LI Panfeng, LIU Changchun, QI Jianghao, QIANG Xiaoke. Quaternary Magnetostratigraphy Record in Sediments from Borehole BHS01 in the Bohai Strait[J]. Geoscience, 2019, 33(02): 315-324.

图/表 4

图1 渤海地区构造简图及钻孔位置图(据文献[57]修改)

Fig.1 Schematic map of geotectonic units of the study area and the location of borehole BHS01(modified after reference[57])

图2 BHS01孔代表性样品退磁正交矢量投影图(实心圆和空心圆分别代表水平投影和垂直投影)

Fig.2 Orthogonal vector plots of representative samples from borehole BHS01 (solid and open circles denoting horizontal and vertical components respectively)

图3 BHS01孔岩石地层和磁性地层分析结果

Fig.3 Lithology and magneto-stratigraphy of borehole BHS01

图4 BHS01孔与渤海及周边地区钻孔古地磁极性柱对比(①据文献[28],②据文献[1],③据文献[35],④据文献[36],⑤据文献[32],⑥据文献[24],⑦据文献[23],⑧据文献[55,56,57])

Fig.4 Comparison of the magneto-stratigraphy of borehole BHS01 with other boreholes from the Bohai Sea and adjacent areas

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渤海海峡BHS01孔沉积物磁性地层学研究

Quaternary Magnetostratigraphy Record in Sediments from Borehole BHS01 in the Bohai Strait

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