MIS3中期以来北黄海中部陆架古环境演化

发布时间：2018-05-01 19:06

本文选题：MIS中期 + 北黄海　；参考：《沉积学报》2016年01期

【摘要】：通过对北黄海中部陆架DLC70-2孔的岩性、粒度、微体古生物以及AMS14C年代学的分析,探讨了研究区MIS3中期以来的古环境演化。研究表明,北黄海中部陆架MIS3中期以来的沉积环境演化与海平面变化存在良好的对应关系,具有明显的阶段性特征:岩芯22.89~18.50 m段(43 639~42 558 cal yr B.P.)对应MIS3中期海平面上升过程中形成的河口湾相,与上覆地层之间存在明显的沉积间断;随着海平面的逐渐上升,海水自14 602 cal yr B.P.开始侵入研究区,形成了18.50 m以上的沉积地层,自下而上可划分为末次冰盛期以来海平面上升过程中的河口充填相(18.50~10.02 m,14 602~12 602 cal yr B.P.)—新仙女木事件中晚期海平面停滞期间的河流泛滥平原相(10.02~5.10 m,12 602~10 357 cal yr B.P.)—全新世早中期海平面上升过程中的滨海、浅海相(5.10~0 m,10 357~4 913 cal yr B.P.)。岩芯10.02~5.10 m段(12 602~10 357 cal yr B.P.)记录的源自河流泛滥平原沉积的硬质黏土层与新仙女木事件的全球效应密切相关,可作为新仙女木事件在北黄海陆架响应的一个重要证据。
[Abstract]:Based on the analysis of lithology, granularity, micropaleontology and AMS14C chronology of the DLC70-2 pore in the central shelf of northern Huang Hai, the paleoenvironmental evolution since the middle period of MIS3 in the study area is discussed. The results show that there is a good correspondence between the evolution of sedimentary environment and sea level change since the middle of MIS3 in the central continental shelf of North Huang Hai, with obvious stage characteristics: core 22.89 ~ 18.50 m member 43 639 ~ 42 558 cal YR B.P.) Corresponding to the estuarine facies formed during the middle MIS3 sea level rise process, there are obvious sedimentary discontinuities between the estuarine facies and the overlying strata, and with the rising of sea level, the sea water rises from 14 602 cal yr B.P. Began to intrude into the study area, forming sedimentary strata over 18.50 m, The bottom-up can be divided into estuarine filling facies in the process of sea level rise since the last ice peak, 18.50 ~ 10.02 m ~ (1) ~ (14) 602 ~ (2) ~ (12) 602 cal YR B.P.-River flood plain facies during the middle and late stage sea level stagnation of the Xinxianmu event (10.02 ~ (5.10) m ~ (10) ~ (10 357) cal YR B.P. The coastal area in the process of sea-level rise in the early and mid-Pleistocene. The shallow sea facies are 5.10 ~ 0 m ~ (10 ~ 3 57) ~ 4 913 cal YR B.P. Core 10.02 ~ 5.10 m member 12 602 10 357 cal yr B.P. The hard clay layer recorded from the fluvial flood plain is closely related to the global effect of the Neo-Andromeda event and can be used as an important evidence of the response of the Neo-Andromeda event in the northern Huang Hai shelf.
【作者单位】：国土资源部海洋油气资源与环境地质重点实验室;青岛海洋地质研究所;
【基金】：国家自然科学基金项目(41406077) 国土资源大调查项目(1212011220113;GZH201500203;GZH201400205)~~
【分类号】：P736.22

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