摘要
浙江全新世海滩岩，是迄今为止发现的我国全新世海滩岩的分布北界。本文介绍了浙江全新世海滩岩的基本特征，并利用海滩岩形成的特殊气候及地理环境条件，结合￣（１４）Ｃ测年数据，对浙江海滩岩形成时期的气候及浙江全新世海面变化进行了初步探讨。
Up to now,Holocene beachrocks have been found in 6 places along the coast of Zhejiang Province.The discovery of the Holocene beachrocks in Zhejiang Province,movesthe north limit of Holocene beachrock from the Pingtan Island(25.6°N)of FujianProvince to Changtu Island(30.2°N)of Zhejiang Province. In our country,modernbeachrocks were only found in the Hainan Island ,Xisha Islands and Nansha Islands,theareas south of 18.5°N.18.5°N.￣(14)C dating data of beachrock samples show that Zhejianbeachrocks formed in Middle Holocene(Atlantic Period and Subnorth Period),about600O-2400 a B.P.,which can be devided into 5 stages :6000-5900,5600-5400,510O-4300,390O-3700and 320O-2400a B.P.。And through the analysis of climatic and geographic-en-vironmental conditions of beachrock formation,the temperature was 3-5℃ higher during600O-2400 a B.P.when the Zhejiang beachrock formed than it is now. There were,how-ever, 4 obvious cold periods from then on,i.e.590O-5600, 540O-5100,430O-3900 and370O-3200 a,B.P.respectively.The temperature was as high as or a little lower thannow. In addition,there were 3 high sea levels in Holocene in Zhejiang Province. The peaksea levels occurred during 6000,5400 and 2400 a B.P.,and were about 2-2.5m higherthan the present one.
出处
《海洋地质与第四纪地质》
CAS
CSCD
北大核心
1994年第1期35-42,共8页
Marine Geology & Quaternary Geology
关键词
全新世
海滩岩
古地理
Zhejiang Holocene beachrock geographic environment
