华南海岸沙丘岩形成与全新世环境变化的关系  

Relationship between Development of Coastal Dune Rock and Holocene Environmental Changes in South China

作　　者：王为[1] 吴正[1] 

机构地区：[1]华南师范大学地貌与第四纪环境研究所,广州510631

出　　处：《地理学报》2009年第9期1126-1133,共8页Acta Geographica Sinica

基　　金：广东省自然科学基金(7005836);国家自然科学基金(40871020)资助项目~~

摘　　要：海岸沙丘岩是热带亚热带地区由碳酸盐胶结的海岸风成堆积,其成岩过程的各个阶段需要特定的水热和地貌条件。对华南海岸沙丘岩的形成年代、堆积高度、出露地点进行统计分析,将其特征与全新世环境变化事件作对比,结果显示华南沿海沙丘岩的形成过程与全新世气候变化及海平面变化等事件有很好的对应关系,能很好地解释我国沙丘岩研究中一些尚未解决的问题:华南沿海缺少5000aBP以前沙丘岩是因为当时的沙丘岩形成于低海面,后来因海面上升而被淹没;3000aBP前后海岸风沙大规模堆积是大暖期结束后气温下降的结果;华南沿海沙丘岩的胶结主要发生在中世纪暖期;华南沿海缺少年代小于1000aBP沙丘岩是因为近千年来气候条件下,不适合沙丘岩的胶结。A correspondence was found between Holocene environmental changes and coastal dune rock development by comparing the features of the sea-level and climate changes in Holocene period with the ages,scales,and cemented styles of the dune rocks on South China coasts. The finding can well explain some unresolved problems in the previous researches on the coastal dune rocks in South China：（1） There was no dune rock that formed before 5000 aBP in South China because the dune rocks that formed before 5000 aBP were covered by the sea water rise in the late periods; （2） The dune rocks with ages of around 3000 aBP were widely seen in South China today because the coastal dunes were cumulated on a large scale at that time as a result of temperature fall since the end of Megathermal; （3） Medieval Warm Period was the main period for the aeolian dunes to be cemented into the coastal dune rocks in South China; （4） Lack of dune rock of less than 1000 a BP was due to the fact that the climate conditions in recent 1000 years were not suitable for the cementation.

关 键 词：华南 海岸 沙丘岩 气候变化 海平面 全新世 

分 类 号：P737.1[天文地球—海洋地质]