本文關(guān)鍵詞： 長(zhǎng)江三角洲北翼 古河間臺(tái)地 全新世 淺海相 粉(細(xì))砂灘　出處：《海洋湖沼通報(bào)》2016年05期 　論文類型：期刊論文

【摘要】：本研究獲取了位于長(zhǎng)江三角洲北翼呂四外古殘留臺(tái)地之上的SR11孔,通過對(duì)該孔上部22.2m地層粒度、磁化率、有孔蟲屬種和14 C年代的研究,重建了該河間臺(tái)地全新世海岸環(huán)境變遷歷史。結(jié)合輻射沙洲核部其他鉆孔資料,本研究認(rèn)為:末次盛冰期北坎和三余之間古長(zhǎng)江支谷與干流河谷之間存在殘留的谷間臺(tái)地,向東向南延伸至呂四外的潮灘及近濱地帶。9—5cal ka BP期間,呂四外的殘留河間臺(tái)地主要處于淺海環(huán)境,但部分時(shí)段頻繁受到風(fēng)暴活動(dòng)影響。該階段后期,海平面上升速率減緩,臺(tái)地演化至潮下帶下部環(huán)境。5cal ka BP以后,海平面上升到-3m以上,臺(tái)地逐漸演化到潮間帶下部-潮下帶上部的粉(細(xì))砂灘環(huán)境。呂四外殘留臺(tái)地之上的全新統(tǒng)地層中未發(fā)現(xiàn)潮流沙脊相沉積。
[Abstract]:In this study, the SR11 hole located on the Lusiwai paleoresidual platform in the northern wing of the Yangtze River Delta was obtained. The granularity, magnetic susceptibility, foraminifera species and 14C age of the upper part of the hole were studied. The history of the Holocene coastal environmental change of the Hejian platform was reconstructed, and other borehole data of the radiative sandbar core were combined. In this study, it is concluded that there are residual intervalley platforms between the paleo-Yangtze River branch valley and the main stream valley between the last glacial peak period and the northern ridge and more than three years. During the period of eastward and southward extension to the tidal flat outside Lusi and near the littoral zone .9-5cal ka BP, the residual interriver platform of Lusiwai is mainly located in the shallow sea environment. However, in some periods, it is frequently affected by storm activity. In the latter stage, the rising rate of sea level slows down, and the sea level rises above -3m after the platform evolves to the environment of .5cal ka BP in the lower part of the subtidal zone. The platform gradually evolves to the silt (fine) sand beach environment in the lower part of the intertidal zone and the subtidal zone.
【作者單位】： 廣東財(cái)經(jīng)大學(xué)地理與旅游學(xué)院;中國(guó)科學(xué)院南海海洋研究所中國(guó)科學(xué)院邊緣海重點(diǎn)實(shí)驗(yàn)室;
【基金】：教育部人文社會(huì)科學(xué)研究青年基金項(xiàng)目(14YJCZH145) 國(guó)家自然科學(xué)基金青年基金項(xiàng)目(41306047)資助
【分類號(hào)】：P736.22
【正文快照】： 引言自20世紀(jì)70年代大范圍地質(zhì)調(diào)查的開始,長(zhǎng)江三角洲第四紀(jì)沉積環(huán)境演化一直是我國(guó)地學(xué)研究的熱點(diǎn)問題之一。以李從先為代表的眾多學(xué)者對(duì)長(zhǎng)江三角洲晚第四紀(jì)層序地層的研究首先識(shí)別出了全新世長(zhǎng)江三角洲演化的一個(gè)重要模式——河口沙壩-汊道體系[1-2]。另外一方面的進(jìn)展主要

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