
广东黄圃镇海蚀遗址的形成年代及古地理环境
The age and geographical environment of ancient marine eroded landform at Huangpuzhen,Guangdong
广东中山市黄圃镇海蚀遗址是广东沿海至今为止所发现最大规模的海蚀遗址之一,古海蚀地貌延伸范围超过200米,海蚀洞、海蚀崖、海蚀平台等海蚀地貌仍保持得较为完好。根据地形特征、地层(钻孔)资料、海侵范围、史料记载进行综合确定了古海蚀遗址的形成年代和古地理环境。古海蚀崖所在的尖峰山由白垩系陆相红色碎屑岩系构成。黄圃附近地区在晚更新世末期第一次海侵前已经是一隆起地块,在晚更新世和全新世两次海侵时都处在较高的位置,出露的白垩系地层(尖峰山)为蚀余的低矮山地。这些残余山地在全新世海侵大部分时段内为珠江口古海湾中的岛屿,黄圃镇作为大陆岸线的时间很短,海蚀地形主要形成于晚全新世前海侵时(距今约6100~1600年)的岛屿时期。
The ancient marine eroded landform located at Huangpuzhen town extends more than 200m along the eastern foot of Jianfengshan,a small relic mountain in Zhujiang river delta plain,with well formed marine notches,cliffs and platforms.It is one of the largest ancient marine eroded landforms in Guangdong.However,there is not any marine biological deposits remained in the cliffs or notches for radiocarbon dating to find out the age of the landform.The features of the marine eroded landform,stratum date and 14C dating from boreholes in the nearby areas,changes of transgression boundaries in Zhujiang estuary during the Holocene era and recording of historical documents have to be used together to identify ancient geographical environment of Huangpuzhen and the time when the landform was formed.The result of this study shows that the area of Huangpuzhen had been a projecting block of red Cretaceous conglomerate by the time of the first transgression which happened in the later Pleistocene.Jianfengshan,the relic mountain of the block,was therefore located as an island in the ancient Zhujing estuarine bay in the most of time of Holocene transgression.When the transgression ended,the shoreline of Zhujiang delta moved out seaward,and the bay was gradually filled into a deltaic plain and the low hill became a relic mountain on the plain.The period for the marine eroded landform at Huangpuzhen to be formed was 6100-1600 aBP,when the low hill was as an island in the Holocene transgression.
海蚀遗址 / 岛屿 / 全新世海侵 / 黄圃镇 {{custom_keyword}} /
ancient marine eroded landform / island / Holocene transgression / Huangpuzhen town {{custom_keyword}} /
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广东省自然科学基金项目(031529)
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