威海南部近岸泥质区晚更新世以来的沉积环境演化  

SEDIMENTARY ENVIRONMENTAL EVOLUTION OF MUD AREA OFF THE SOUTHERN COAST OF WEIHAI SINCE LATE PLEISTOCENE

作　　者：刘金庆[1,2] 印萍[1,2] 陈小英[1,2] 曹志敏[2,3] 王松涛 吴振 宋委 

机构地区：[1]国土资源部油气资源和环境地质重点实验室,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 [3]中国海洋大学海洋地球科学学院,青岛266100 [4]山东省第四地质矿产勘查院,潍坊261021

出　　处：《海洋地质与第四纪地质》2016年第6期199-209,共11页Marine Geology & Quaternary Geology

基　　金：国家自然科学青年基金项目(41406081,41506107);山东地勘专项(201323);科技部基础性专项(2013FY112200);中国-东盟海洋地学研究与减灾防灾倡议

摘　　要：对威海南部近岸泥质区WHZK01钻孔(孔深25.1m)岩心开展粒度分析、AMS14 C和光释光(OSL)年代学测试,结合地震地层特征以及周边钻孔对比,建立了晚更新世晚期以来的地层框架,揭示出该地区主要经历了3个阶段的演化过程:(1)氧同位素3期晚期(MIS3a)的河流沉积,水动力环境动荡;(2)氧同位素1期(MIS1)早期河漫滩与河口湾沉积,动力环境总体较弱;(3)全新世滨海—浅海沉积,沉积环境弱而稳定。海平面变化是影响研究区晚更新世以来的沉积演化的主要因素,尤其全新世高海平面以来,随着黄海暖流的形成和黄海环流格局的建立,大量黄河物质在山东半岛沿岸流作用下输运到研究区,使得威海近岸泥质区得以快速发育。Three stages of evolution are recognized since Late Pleistocene based on the data of grain size analysis,AMS14 C dating,OSL dating of the shallow drilling hole（WHZK01）25.1mlong from the muddy area in the southern Weihai coast,in combination with the seismic stratigraphy and other drilling cores nearby.1）The fluvial facies（late MIS3）formed in a turbulent and unstable strong dynamic environment;2）The flood plain and estuarine facies（early MIS1）formed in a weak dynamic environment;3）The nearshore and shallow marine facies formed in a weak and stable environment.The sea level change since Late Pleistocene is the major factor controlling the sedimentary evolution of the study area.When the sea level rose to the highest level in the Middle Holocene,the modern Yellow Sea circulation patterns began to establish with the formation of the Yellow Sea warm current.Under the control of the Yellow Sea coast flow,the sediments were transported to the study area from Huanghe River bypassing through the Chenshan Head and thus the mud area was formed quickly off the southern coast of Weihai.

关 键 词：粒度 高分辨率 沉积环境 泥质区 威海南部近岸 

分 类 号：P731.2[天文地球—海洋科学]