A Preliminary Study on Mid-Holocene Paleoclimate and Paleoenvi-ronment along the Coast of Zhejiang Province

Abstract

Abstract: Paleoclimate and paleoenvironment are discussed on the basis of faunas and¹⁴C dating,δ¹⁸O values, etc. of Mid Holocene beachrocks in Zhejiang province in the paper. Results of the study indicate that Zhejiang province belonged to the tropical zone in Mid-Holocene. This period can be divided into three epochs: (1) before 6040 aBP, (2) 5860-3210 aBP, (3) 2875-2770 aBP. In the second epoch, it was warmmer, especially the period of 5490-4110 aBP with megathermal maximum, the paleotemperature calculated by δ¹⁸O was 5-6℃ higher than that of the present.

Key words: paleoclimate, paleoenvironment, fauna, MidHolocene, Zhejiang Province

摘要： 首次通过对浙江象山爵溪镇下沙、大岙和岱山大长涂岛小沙河3个中全新世海滩岩剖面进行以动物群分析为基础，应用δ¹⁸O和¹⁴C等手段相结合的综合研究，初步分析了浙江沿海中全新世的古气候、古环境。认为海滩岩中热带贝类的出现是中全新世时气候变暖的结果。当时热带向北扩展到了浙江中北部地区，可分为3个暖期：6 040 aBP前、5 860～3 218 aBP和2 875～2 770 aBP,其中5 860～3 210 aBP较暖，它又可分为：5 860～5 490 aBP，5 490～4 110 aBP和3 765～3 210 aBP3个阶段，以5 490～4 110 aBP为最暖期，由δ¹⁸O计算的古气温约比现今当地高5～6℃。还由微量元素等特征推测了当时的古环境。

关键词: 古气候, 古环境, 动物群, 中全新世, 浙江

CLC Number:

Q915.81

JIANG Dayong,YANG Shouren. A Preliminary Study on Mid-Holocene Paleoclimate and Paleoenvi-ronment along the Coast of Zhejiang Province[J]. Acta Scientiarum Naturalium Universitatis Pekinensis.

江大勇, 杨守仁 . 浙江沿海中全新世古气候、古环境初步分析[J]. 北京大学学报（自然科学版）.

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A Preliminary Study on Mid-Holocene Paleoclimate and Paleoenvi-ronment along the Coast of Zhejiang Province

浙江沿海中全新世古气候、古环境初步分析

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