摘要
运用MALVERN公司2000型粒度仪对珠江三角洲地区的江村ZK2钻孔作粒度分析,江村钻孔按粒度的偏态值可划分为两个河相与海相或湖泊沼泽相的沉积交替过程,同时与粒度参数、年代数据以及前人所做的孢粉等证据相结合,大致看出研究区气候变化的4个千年尺度的气候波动:第一阶段为较长时间的冷干期,该段时间约为20—10.7kaB.P.;第二阶段为回暖期,时间大致在10.7—7.5kaB.P.,总体比较湿润;第三阶段为升温期,该时期约在7.5—5kaB.P.之间,在此期间各有一次干湿交替;第四阶段为降温期,时间大约出现在5kaB.P.至今,这是一个波动性较大的时期,也各有一次干湿交替。
The 2000-Type particle-size analyser was used to make the grading analysis of the granularity of the sediments from the Jiangcun ZK2 cole in the Pearl River Delta. We marked off that two river sediment appearances exchanged with two sea or lake sediment appearances in Jiangcun＇s cole from the deflection value . And we combined the granularity＇s parameter with chronology data and other researcher＇s pollen data to get the result. There were 4 climate fluctuations from the 20 thousand years in the study area： The first was a long cold dry period. It lasted from 20 000 aB. P. to 10 700aB. P. The second was warmer period, the time was 10 700-7 500a B. P.. It was wet. The third was a calefactive period,the time was 7 500-5 000a B. P.. There were a dry time exchanging with a wet time. The fourth was a temperature dropping period. It was from 5 000aB. P. to now and it was a more fluctuate time . There were also a dry time exchanging with a wet time in the fourth period.
出处
《地层学杂志》
CSCD
北大核心
2005年第B11期631-634,共4页
Journal of Stratigraphy
基金
广东省自然科学基金资助项目(批准号:[2000]24号000301)。
关键词
粒度分析
粒度参数
沉积相
古环境
古气候
第四纪
珠江三角洲
广东
grading analysis, parameter of grain-size, sedimentary facies, paleo environment, paleoclimate, Pearl River Delta, Guangdong
