The Holocene sporopollen characteristics and their paleoenvironmental significance of Core GZ-2 in Pearl River Delta
Wang Jianhua1, Wang Xiaojing1, Cao Linglong1,2, Zheng Zhuo1, Yang Xiaoqiang1, Yang Jie1,2
1 Department of Earth Sciences, Sun Yat-Sen University, Guangzhou 510275,Guangdong 2 South China Sea Branch, State Oceanic Administration, Guangzhou 510300,Guangdong
摘要 根据珠江三角洲GZ-2孔测年结果、岩相特征和孢粉地层信息推断,该地区全新统约在6.0 ka BP开始沉积, 全新统孢粉组合特征与更新统相比有明显的区别,表明全新世与更新世的气候相比有明显变化。孢粉与沉积信息揭示,全新世本区气候基本以暖湿为主,气候波动不大,在5.0~2.4 ka BP表现最为热湿,在2.4~1.9 ka BP相对偏凉干,随后恢复暖湿。在这些相对较明显的波动中还包含有次一级的微弱波动。除了反映气候变化,孢粉信息也指示了一定的沉积环境变迁以及人类活动信息。该区在中全新世经历了一次明显的海侵过程,进入晚全新世后人类活动对三角洲植被和环境的影响加剧, 期间水深逐渐变浅,沉积环境由河口湾、浅海、滨海潮滩逐渐演变为三角洲平原,区域气候的变化与海平面变化趋势基本一致。
Abstract:Based on the age data, the sediment characteristics and the sporopollen stratigraphic information of the core GZ-2, Pearl River Delta, the Holocene in the region is suggested to begin from 6.0 ka BP. The characteristics of the Holocene sporopollen groups show the obvious difference from those of the Pleistocene, indicating an obvious change of climate. The sporopollen and the sediment information demonstrate that the paleoclimate of the Holocene is basically warm and wet, with a moderate fluctuation. The hottest and wettest period appeared around 5.0-2.4 ka BP, then the climate became relatively cool and arid around 2.4-1.9 ka BP, warm and wet after 1.9 ka BP, with some weaker fluctuations within these relatively long and remarkable variations. In addition to reflecting the climate change, the sporopollen information indicates also certain deposition environmental changes as well as human activity. An obvious transgression process appeared in the Middle Holocene in this region, and the influence of human activity to the botanic and sedimentary environment intensified gradually after the beginning of the Late Holocene. During this period, the water in Pearl River Delta area became shallower gradually, and the sedimentary environment changed from estuary-shallow sea to seashore shoal, finally to delta plain. The climatic variations in the region are essentially consistent with the sea level changes.
Wang Jianhua,Wang Xiaojing,Cao Linglong et al. The Holocene sporopollen characteristics and their paleoenvironmental significance of Core GZ-2 in Pearl River Delta[J]. JOPC, 2009, 11(6): 661-669.
陈木宏, 赵焕庭, 温孝胜,等. 1994. 伶仃洋L2和L16孔第四纪有孔虫群与孢粉化石带特征及其地质意义[J]. 海洋地质与第四纪地质, 14(1):11-21. 方国祥,李平日,黄光庆. 1991.珠江三角洲8000年来海平面变化[J].地理研究,10(4):1-11. 黄镇国,李平日,张仲英,等.1982. 珠江三角洲的形成发育演变[M].广东广州:科学普及出版社广州分社,1-274. 黄镇国,蔡福祥. 2007.珠江口晚第四纪埋藏风化层及其环境意义[J].第四纪研究, 27(5):828-833. 蓝先洪. 1996. 珠江三角洲晚第四纪沉积特征[J].沉积学报,14(2):155-161. 雷作淇,郑卓. 1990. 黄茅海晚第四纪孢粉组合与环境变迁[J].热带海洋, 9(4):24-27. 李平日,郑建生,方国祥. 1989. 广州地区第四纪地质[M].广东广州:华南理工大学出版社,53-81. 李平日,彭乔年,郑洪汉,等. 1991. 珠江三角洲一万年来环境演变[M].北京:海洋出版社,1-23. 李平日,谭惠忠,侯的平. 1997.2000年来华南沿海气候与环境变化[J].第四纪研究,(1):86-94. 沈才明,王开发,陈培虹.1989. 珠江三角洲第四纪晚期孢粉组合[J].热带海洋,8(4):61-69. 孙邵先. 1991. 海桑属花粉在南海晚第四纪地层中的分布及意义[J].热带海洋,10(1):21-25. 徐明广,马道修,周青伟,等. 1986.珠江三角洲地区第四纪海平面变化[J].海洋地质与第四纪地质,6(3):93-102. 杨小强,李华梅,余素华. 2003.从SX97孔分析深圳沿海近3万年来海平面及气候变迁[J].地球化学,32(2):146-154. 张伟强,黄镇国. 2005. 珠江三角洲晚第四纪气候波动的新认识[J].热带地理, 25(4):298-321. 张玉兰.2006.上海东部地区全新世孢粉组合及古植被和古气候[J].古地理学报,8(1):35-41. 张玉兰,余素华. 1999. 深圳地区晚第四纪孢粉组合及古环境演变[J].海洋地质与第四纪地质, 19(2):109-11. 赵淑君,程捷,尹功明,等.2008.北京平原区中更新世以来的孢粉组合及其古气候意义[J].古地理学报,10(6):637-646. 郑卓,周昆叔. 1995. 海桑属花粉在广东沿岸晚更新世地层的发现[J]. 中山大学学报(自然科学版),34(4):88-92. 郑卓.1990.潮汕平原全新世孢粉分析及古环境探讨[J].热带海洋,9(2):31-38. 郑卓.1991.潮汕平原近五万年来的孢粉植物群与古气候[J].微体古生物学报,8(4):461-480. 郑卓,王建华. 1998. 珠江三角洲北部晚第四纪孢粉植物群的古环境意义[J].热带海洋, 17(3):1-9. Faegri K, Iversen J. 1989. Textbook of pollen analysis[M]. New York: JhonWiley and Sons,76-81. Shi Yafeng, Kong Zhaochen, Wang Sumin, et al. 1992. The important climatic fluctuations and events in China during the Holocene Mega thermal[J]. Science in China(Series B), 22(12):1300-1308. Vidal G A. 1988. Palynological preparation methods[J]. Palynology, 12: 215-220. Wang Yongjin,Cheng Hai, R Lawrence Edwards, et al. 2005. The Holocene Asian Monsoon: Links to Solar Changes and North Atlantic Climate[J]. Science, 308(5723):854-857. Zheng Zhuo,Li Qianyu.2000. Vegetation,climate,and sea level in the past 55000 years,Hanjiang Delta,southeastern China[J].Quaternary Research,53:330-340.