基于珠江三角洲ZK13孔年代和微体古生物重建的晚第四纪环境演化历史  

Late Quaternary evolution history shown by Borehole ZK13 in Pearl River Delta, based on chronology and micropaleontology

作　　者：赵信文[1] 罗传秀[2] 陈双喜[1] 黄长生[1] 曾敏[1] 刘凤梅[1] 陈雯[1] 

机构地区：[1]中国地质调查局武汉地质调查中心,湖北武汉430205 [2]中国科学院南海海洋研究所,广东广州510301

出　　处：《地质通报》2016年第10期1724-1733,共10页Geological Bulletin of China

基　　金：中国地质调查局项目(编号:12120115044501;1212011120174);国家自然科学基金项目(批准号:41306058)

摘　　要：依据珠江三角洲ZK13钻孔沉积物孢粉、微体古生物鉴定及年龄测试结果,将钻孔剖面记录的古环境信息划分为4 个阶段.Ⅰ：91.50±11.00-84.61±5.47ka, 孢粉组合为三缝孢- 栎属- 禾本科- 栲属- 松属- 栗属- 大戟科,反映溫暖湿润气候,未见有孔虫及介形虫化石,沉积环境为陆相;Ⅱ： 84.61±5.47-59.46±3.02ka,孢粉组合为栲属- 三缝孢- 栎属- 禾本科- 栗属- 石竹科- 单缝孢,反映干暖气候,未见有孔虫及介形虫化石,沉积环境为陆相;Ⅲ：59.46±3.02-2ka,孢粉浓度低,以孢子及木本植物花粉为主,进一步划分3 个亚带,总体气候以溫暖潮湿为主,微体古生物含量高,底栖有孔虫丰度远大于介形虫丰度,推测为海陆过渡相沉积环境;Ⅳ：2000-1000a,孢子含量最高,木本、草本植物花粉含量降低,气候较Ⅲ阶段更湿润,微体古生物以介形虫为主,依据化石组合和数量,推测为海陆过渡相沉积环境.Based on the test results of sediment pollen, micropalaeontological identification and age of ZK13 core in the Pearl Riv-er Delta, the authors divided the palaeoenvironmental record information of the drilling section into four stages. I ： 91.50±11.00？ 84.61±5.47ka, the pollen assemblage is composed of trilete spore-Guercus-Poaceae- Castanopsis-_Pinus-Castanea-Euphorbiace- ae, reflecting a warm and humid climate, and there are no fossils of foraminifera and ostracods, indicating a continental sedimentary environment. II ： 84.61±5.47？ 59.46±3.02ka, the pollen assemblage is Ca^tanopsis- trilete spore- Qu^rcu^- Poaceae- Ca^tanea- Caryophyllaceae-monolete spore, reflecting a dry and warm climate, and there are no fossils of foraminifera and ostracods, indicat-ing a continental sedimentary environment. ID ： 59.46±3.02.？ 2ka, the concentration of pollen is low; there are mainly spores and pollen of tree plants. It can be divided into three subzones, the climate is generally war^i and humid. The content of micropalaeon-tology is high, the abundance of benthic foraminifera is much higher than that of ostracods, presumably it is sedimentary environ-ment of transitional facies from sea to land. IV 7： 2000~1000a, spore has the highest content. The percentage of pollen of tree and herbaceous is reduced, the climate is more moist than phase III. The micropalaeontology is mainly ostracods. Based on assemblagesand number of fossils, presumably it is a sedimentary environment of transitional facies from sea to land.

关 键 词：珠江三角洲 年龄 孢粉 微体古生物 

分 类 号：P534.63[天文地球—第四纪地质学]