莱州湾南岸全新世相对海平面变化重建

发布时间：2017-12-28 17:19

本文关键词：莱州湾南岸全新世相对海平面变化重建　出处：《地质通报》2016年10期 　论文类型：期刊论文

更多相关文章： 全新世 海平面 冰融水脉冲 莱州湾

【摘要】：在对莱州湾南岸8个钻孔沉积物沉积结构及有孔虫特征分析基础上,识别相关海面标志层位,辅以加速器质谱AMS14C测年,重建了全新世相对海面变化历史,并讨论了海面变化的沉积响应及控制因素。约9200cal BP以前,海面快速上升,研究区海侵时海面于-21.5m左右;9200~8400cal BP海面上升速率减缓至约2mm/a;8400~8000cal BP海面由-14m快速上升至-5.5m,速率约为33mm/a;8000~7600cal BP,海面持续数百年停滞或微弱下降;7600~7000cal BP海面由-5.5m快速上升至0m以上,速率至少约为13mm/a;7000~6000cal BP海面缓慢上升至+2~+3m位置,速率约为3mm/a;约6000cal BP以后海面缓慢下降至现今水平。约9200cal BP以前、8400~8000cal BP、7600~7000cal BP时期的3次海面快速上升,是MWP-1C融水脉冲、诱发8.2ka冷事件的融水脉冲,以及MWP-2融水脉冲的中纬度地区响应。中全新世全球冰融趋于停滞后,由于研究区沉积盆地沉降速度较慢,在冰川均衡调整效应下,使+2~+3m的相对高海面得以呈现。
[Abstract]:In the analysis of the South Bank of Laizhou Bay, 8 drilling sedimentary structure and foraminiferal characteristics, identification of sea marker horizons, supplemented by accelerator mass spectrometry AMS14C dating, the reconstruction of the Holocene sea-level change history, and discussed the sedimentary response of sea level change and control factors. About 9200cal BP before the sea level rises rapidly, the study area at sea transgression at about -21.5m 9200~8400cal BP; sea level rise rate slowed to about 2mm/a; 8400~8000cal BP -14m by the sea quickly rose to -5.5m, the rate is about 33mm/a; 8000~7600cal BP, the last several hundred years of stagnation or slight decline; 7600~7000cal BP surface by -5.5m quickly rose to 0m above the rate of at least about 13mm/a 7000~6000cal BP; the sea slowly rising to the position of +2~+3m, the rate is about 3mm/a; about 6000cal BP after the sea slow down to the present level. The 3 rapid rise of sea surface in the period before 9200cal BP, 8400~8000cal BP and 7600~7000cal BP is the melting water pulse of MWP-1C meltwater pulse, the 8.2ka cold event and the middle latitude area response of MWP-2 meltwater pulse. After the middle Holocene global ice melting is stagnant, due to the slow subsidence of sedimentary basins in the study area, the relative high sea level of +2~+3m can be presented under the effect of glacier equilibrium adjustment.
【作者单位】：中国地质调查局天津地质调查中心;中国地质调查局泥质海岸带地质环境重点实验室;山东省地质调查院;
【基金】：中国地质调查局项目(编号:1212011220484)
【分类号】：P736.22
【正文快照】： 1.中国地质调查局天津地质调查中心,天津300170;2.中国地质调查局泥质海岸带地质环境重点实验室,天津300170;3.山东省地质调查院,山东济南2500131.Tianjin Center,China Geological Survey,Tianjin 300170,China;2.CGS Key Laboratory of Muddy Coast Geo-environment,Tianjin

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