| 山东荣成沿岸晚第四纪埋藏冲积扇的沉积特征及意义 |
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| 引用本文： | 陈刚,李萍,李从先.山东荣成沿岸晚第四纪埋藏冲积扇的沉积特征及意义[J].海洋地质与第四纪地质,1994(1). |
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| 作者姓名： | 陈刚 李萍 李从先 |
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| 作者单位： | 同济大学海洋地质系 |
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| 摘 要： | 钻孔资料表明，山东荣成沿海的第四纪地层中，全新世沙坝─泻湖沉积体系之下，大多埋藏着晚第四纪冲积扇，其中的粗粒沉积层常常是很好的含水层。鉴于沉积构造在钻孔中有时显示的并不明显，本文书以岩性及旋回性、粒度、分选、磨园度、矿物组成以及大型相序等方面讨论和识别埋藏冲积扇沉积物。荣成的埋藏冲积扇形成于晚第四纪低海面时期，分布于沿海丘陵坡麓直到滨海地带。目前，冲积扇的中、上部是淡水补给区，其中部或前缘以隔水层和上覆的海水或沙坝─泻湖体系隔开，使冲积扇中的淡水得以保存。充分认识埋藏冲积扇的沉积特征和标志，对于荣成沿海或与其条件类似的其他沿海地带的地下水勘探和开发具有实际意义。
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| 关 键 词： | 山东荣成，晚第四纪，埋藏冲积扇 |
CHAKACTERISTICS AND SIGNIFICANCE OF LATE QUATERNARY BUKIED ALLUVIAL FAN DEPOSITS ALONG THE COASTAL ZONE OF RONGCHENG,SHANDONG PROVINCE |
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| Chen Gang Li Ping Li Congxian.CHAKACTERISTICS AND SIGNIFICANCE OF LATE QUATERNARY BUKIED ALLUVIAL FAN DEPOSITS ALONG THE COASTAL ZONE OF RONGCHENG,SHANDONG PROVINCE[J].Marine Geology & Quaternary Geology,1994(1). |
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| Authors: | Chen Gang Li Ping Li Congxian |
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| Abstract: | ate Quaternary alluvial fan deposits underlie Rongcheng postglacial barrier-lagoonsystems,and their coarse-grained layers are usually good aquifers.In this paper,alluvialfan deposits will be discussed and distinguished based on lithologic characteristics,sed-mentation cycles,granularity sorting,roundness,mineral assemblages and lateral faciesdistributions because sometimes sedimentary structure is not well displayed in cores.Buried alluvial fans were formed during Late Quaternary low-standing of sea laveland distributed from the feet of coastal hills to the nearshore zones.Those buried allu-vial fans were partly inundated by sea water of postglacial transgression,hen evaluatedinto bay or barrier-lagoon systems, At the moment,upper-middle parts of the fans arefreshwater supply areas and the middle-lower parts which underlie sea water or barrier-lagoon deposits ,are protected from intrusion of sea water because they are insulated byclayey sediments.Good understanding of the buried alluvial fan deposits and their vertical sequenceshas practical significance to geological work in Rongcheng coast and also in other coastalzones with the same condition as that in Rongcheng. |
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| Keywords: | Rongcheng Shandong Province Late Quaternary buried alluvial fan |
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