SEDIMENTARY ENVIRONMENTAL EVOLUTION OF MUD AREA OFF THE SOUTHERN COAST OF WEIHAI SINCE LATE PLEISTOCENE
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摘要: 对威海南部近岸泥质区WHZK01钻孔(孔深25.1 m)岩心开展粒度分析、AMS14C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。Abstract: Three stages of evolution are recognized since Late Pleistocene based on the data of grain size analysis, AMS14C dating, OSL dating of the shallow drilling hole (WHZK01) 25.1m long 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.
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Key words:
- grain size /
- high resolution /
- sedimentary environment /
- muddy area /
- southern coast of Weihai
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