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 Bore-hole ZK13 in Pearl River Delta, based on chronology and micropaleontology
-
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，反映温暖湿润气候，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，总体气候以温暖潮湿为主，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。Abstract: Based on the test results of sediment pollen, micropalaeontological identification and age of ZK13 core in the Pearl River 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-Quercus-Poaceae- Castanopsis-Pinus-Castanea-Euphorbiaceae, 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 Castanopsis- trilete spore- Quercus- Poaceae- Castanea- Caryophyllaceae-monolete spore, reflecting a dry and warm climate, and there are no fossils of foraminifera and ostracods, indicating a continental sedimentary environment. Ⅲ: 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 warm and humid. The content of micropalaeontology is high, the abundance of benthic foraminifera is much higher than that of ostracods, presumably it is sedimentary environment of transitional facies from sea to land. Ⅳ: 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 assemblages and number of fossils, presumably it is a sedimentary environment of transitional facies from sea to land.
-
Key words:
- Pearl River Delta /
- age /
- pollen /
- micropalaeontology
-
-
[1] Ouyang C M. A terrestrial source of ureyite[J]. Am. Mineral., 1984, 69:1180-1183.
[2] 黄蕴慧, 秦淑英, 周秀仲, 等. 华北地台金伯利岩与金刚石-超镁铁岩块中国矿物学岩石学地球化学研究新进展[M]. 兰州:兰州大学出版社, 1994:168-169.
[3] 樊祺诚, 刘若新, 马宝林, 等. 大别山毛屋超高压变质镁铁-超镁铁岩块中国矿物学岩石学地球化学研究新进展[M]. 兰州:兰州大学出版社, 1994:168-169
[4] Deer W A, Howie R A, Zussman J, et al. Rock Forming Minerals (2A)[M]. Langman, London,1978:520-525.
[5] 郭良田, 李运贵. 珠三角地区晚第四纪以来气候变化和海平面升降的耦合效应[J]. 华南地震, 2008, 28(2):53-56.
[6] Southon J, Kashgarian M, Fontugne M, et al. Marine reservoir cor-rection for the Indian Ocean and Southeast Asia[J]. Radiocarbon, 2002, 44:167-180.
[7] 汪品先. 东海底质中的有孔虫和介形虫[M]. 北京:海洋出版社, 1988.
[8] 郑守仪. 东海的胶结和瓷质有孔虫[M]. 北京:科学出版社, 1988.
[9] Grimm E C. CONISS:A Fortran program for stratigraphically con-strained cluster analysis by the method of incremental sum of squares[J]. Computers and Geosciences, 1987, 13:13-35.
[10] 赵信文, 陈双喜, 黄长生, 等. 珠江三角洲陈村钻孔剖面沉积特征及有机碳同位素古环境意义[J]. 地质通报, 2014, 33(10):1635-1641.
[11] 陈双喜, 赵信文, 黄长生, 等. 现代珠江三角洲地区QZK4孔第四纪沉积年代[J]. 地质通报, 2014, 33(10):1629-1634.
[12] 赵信文, 陈双喜, 黄长生, 等. 基于孢粉数据的珠江三角洲QZK6孔全新世气候定量重建[J]. 地质通报, 2014, 33(10):1621-1628.
[13] 李平日, 方国祥, 黄光庆. 珠江三角洲全新世环境演变[J]. 第四纪研究, 1991, 2:130-139.
[14] 李平日, 郑建生, 方国祥. 广州地区第四纪地质[M]. 广州:华南理工大学出版社, 1989:53-81.
[15] 李平日, 彭乔年, 郑洪汉, 等. 珠江三角洲一万年来环境演变[M]. 北京:海洋出版社, 1991:1-23.
[16] 郑卓, 邓韫, 张华, 等. 华南沿海热带-亚热带地区全新世环境变化与人类活动的关系[J]. 第四纪研究, 2004, 24(4):387-393.
-
计量
- 文章访问数: 1003
- PDF下载数: 51
- 施引文献: 0
下载: