CARBON-NITROGEN RECORD IN SEDIMENTS OF CORE PD IN THE PEARL RIVER DELTA AND THE ENVIRONMENTAL SIGNIFICANCE
-
摘要: 对位于广州番禺东涌镇PD孔的三角洲沉积物进行了有机碳、陆源有机碳和碳氮比值分析,结合微体古生物和14C年代资料,将岩心划分为4个阶段:阶段Ⅰ(23.88~21.71 kaBP)有机碳、陆源有机碳含量递增,存在大量有孔虫和介形虫,反映海侵作用逐渐减弱;阶段Ⅱ(21.71~3.79 kaBP)是一层花斑黏土,有机质含量极低,指示风化作用强烈;阶段Ⅲ(3.79~2.88 kaBP)碳氮比值、陆源和内源有机碳比值的变化在平衡状态波动,指示海平面上升的海陆过渡环境;阶段Ⅳ(2.88 kaBP以来)陆源有机碳比重和碳氮比值较高,主要为受河流作用控制的陆相沉积,气候温暖湿润,陆源碎屑丰富。Abstract: Organic carbon, allochthonous organic carbon and C/N ratio, together with microfaunal and radio carbon dating results of the delta sediments in core PD in the Pearl River delta area are investigated to determine environmental changes. Four stages can be recognized since late Pleistocene. The first stage(about 23.88~21.71 kaBP) is characterized by gradually increasing organic carbon and allochthonous organic carbon, with plenty of foraminifers and ostracods, which indicates the weakening of sea-level rising. The second stage(about 21.71~3.79 kaBP) is represented by a layer of multi-color clay with extraordinary low organic matter, which implies strong weathering. In the third stage(about 3.79~2.88 kaBP), C/N ratio, allochthonous and autochthonous organic carbon ratio fluctuate according to the balance state, which means a marine-terrestrial transitional environment. In the fourth stage(about 2.88 kaBP-present), higher allochthonous organic carbon proportion and C/N ratio reflect terrigenous facies mainly controlled by fluvial effect,and the warm and humid climate brings rich allochthonous clastic matter.
-
Keywords:
- organic carbon /
- allochthonous organic carbon /
- sea-level /
- late Pleistocene /
- Pearl River delta
-
-
[1] Krishnaumurhy R V, Bhallacharya S K, Kusumgar S. Palaeoclimatic changes deduced from 13C/12C and C/N ratios of Karewa Lake sediments, India[J]. Nature, 1986, 323(11):150-152.
[2] Siliman James E, Meyers Philip A, Bourbonniere Richard A. Record of postglacial organic matter delivery and burial in sediments of Lake Ontario[J]. Org.Geochem.,1996,24(4):463-472.
[3] Schubert Carsten J, Ferdelman Timothy G, Strotmann Bettina. Organic matter composition and sulfate reduction rates in sediments off Chile[J]. Organic Geochemistry, 2000, 31:351-361.
[4] Muller A, Ulrike M. The palaeoenvironments of coastal lagoons in the southern Baltic sea:The application of sedimentary C/N ratios as source indications of organic matter[J]. Palaeogeography, Palaeoclimatology, Palaeoecology, 1999, 145(1-3):1-16.
[5] 李学刚,宋金明.海洋沉积物中碳的来源、迁移和转化[J].海洋科学集刊,2004,46:106-117.[LI Xue-gang, SONG Jin-ming. Sources, removal and transformation of carbon in marine sediments[J]. Studia Marina Sinica, 2004 , 46:106-117.]
[6] Sampei Y, Matsumoto E. C/N ratios in a sediment core from Nakaumi Lagoon, southwest Japan-usefulness as an organic source indicator[J]. Geochemical Journal, 2001, 35(3):189-205.
[7] SHEN Ji, Ryo Matsumoto, Wang S M. A 3600 years paleoclimatic change inferred from δ13C and TOC/TN of the Gucheng Lake sediments, Southeast China[J]. Chin.J.Oceanol.Limnol.,1997, 15(3):279-284.
[8] 王苏民,冯敏.内蒙古岱海湖泊环境变化与东南季风强弱的关系[J].中国科学B辑,1991(7):759-768.[WANG Su-min, FENG Min. Relation between southeast season intensity and lacustrine environmental changes in Daihai Lake, Inner Mongolia[J]. Science in China (Series B),1991 (7):759-768.]
[9] 张恩楼,沈吉,夏威岚,等.青海湖沉积物有机碳及其同位素的气候环境信息[J].海洋地质与第四纪地质,2002,22(2):105-108. [ZHANG En-lou, SHEN Ji, XIA Wei-lan, et al. Environmental records from organic carbon and its isotope of Qinghai Lake sediment[J]. Marine Geology and Quaternary Geology, 2002, 22(2):105-108.]
[10] 张振克,吴瑞金,沈吉,等.近2000年来云南洱海沉积记录的气候变化[J].海洋地质与第四纪地质,2001,21(2):31-35. [ZHANG Zhen-ke, WU Rui-jin, SHEN Ji, et al. Lacustrine records showing climatic changes in Erhai Lake, Yunnan Province since the past 2000 years[J]. Marine Geology and Quaternary Geology, 2001, 21(2):31-35.]
[11] 吴敬禄,Andreas Luecke,李世杰,等.兴措湖沉积物有机碳及其同位素记录揭示的近代气候与环境[J].海洋地质与第四纪地质,2000,20(4):37-42. [WU Jing-lu, Andreas Luecke, LI Shi-jie, et al. Modern climatic signals from records of contents of TOC and δ13C in the Xingcuo Lake sediments in eastern Tibetan Plateau, China[J]. Marine Geology and Quaternary Geology, 2000, 20(4):37-42.]
[12] 刘文臣,王荣,李超伦.东海颗粒有机物中的碳氮比[J].海洋与湖沼,1998,29(5):467-470. [LIU Wen-chen,WANG Rong, LI Chao-lun. C/N ratios of particulate organic matter in the East China Sea[J]. Oceanologia et Limnologia Sinica,1998, 29(5):467-470.]
[13] SONG Jin-ming, MA Hong-bo, LÜ Xiao-xia. Nitrogen forms and decomposition of organic carbon in the southern Bohai Sea core sediments[J]. Acta Oceanologica Sinica, 2002, 21:130-131.
[14] 黄镇国,李平日,张仲英,等.珠江三角洲的形成发育演变[M].广州:科学普及出版社,1982.[HUANG Zhen-guo, LI Ping-ri, ZHANG Zhong-ying, et al. Formation, development and evolvement of the Zhujiang River Delta[M]. Guangzhou:Science Popularization Press, 1982.] [15] 曾昭璇,黄少敏.珠江三角洲历史地貌研究[M].北京:高等教育出版社,1987:75-150.[ZENG Zhao-xuan, HUANG Shao-min. Research on physiognomy of Zhujinag River Delta[M]. Beijing:Higher Education Press, 1987:75 -150.]
[16] 李平日,乔彭年,郑洪汉,等.珠江三角洲一万年来的环境演变[M].北京:海洋出版社,1991.[LI Ping-ri, QIAO Peng-nian, ZHENG Hong-han, et al. Environmental changes of the Pearl River Delta during 10000 yrs[M]. Beijing:China Ocean Press, 1991.] [17] 蓝先洪.珠江三角洲晚第四纪以来的古地理研究[J].矿物岩石地球化学通报,1995(2):109-111.[LAN Xian-hong. Paleogeography of the Pearl River Delta since Late Quaternary[J]. Bulletin of Mineralogy, Petrology and Geochemistry, 1995 (2):109-111.]
[18] 徐明广,马道修,周青伟,等.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,1986,6(3):93-102. [XU Ming-guang, MA Dao-xiu, ZHOU Qing-wei, et al. Quaternary sea-level fluctuation in Zhujiang River Delta area[J]. Marine Geology and Quaternary Geology, 1986, 6(3):93-102.]
[19] 朱广伟,陈英旭.沉积物中有机质的环境行为研究进展[J].湖泊科学,2001,13(3):272-279. [ZHU Guang-wei, CHEN Ying-xu. A review of geochemical behaviors and environmental effects of organic matter in sediments[J]. Journal of Lake Sciences, 2001, 13(3):272-279.]
[20] QIAN Jun-long, WANG Su-min, XUE Bin, et al. A method of quantitatively calculating amount of allochthonous organic carbon in lake sediments[J].Chinese Science Bulletin, 1997, 42(21):1821-1823.
[21] 董艺辛.珠江三角洲晚第四纪微体动物群生态特征及其环境意义[D].2005.[DONG Yi-xin. Late Quaternary microfaunal Paleoecology and the environmental implications in the Pearl River Delta[D]. 2005.] [22] 陈国能,张珂,贺细坤.珠江三角洲晚更新世以来的沉积古地理[J].第四纪研究,1994,14(1):67-74. [CHEN Guo-neng, ZHANG Ke,HE Xi-kun. Paleo-geographic evolution of the Pearl River Delta since the Late Pleistocene[J]. Quaternary Sciences, 1994, 14(1):67-74.]
[23] 周厚云,郭国章,余素华.从SX97孔矿物特征看气候环境变化的河流响应[J].矿物学报,2000,20(3):257-263. [ZHOU Hou-yun, GUO Guo-zhang,YU Su-hua, et al. River response to climatic and environmental changes as viewed from mineral characteristics of core SX97[J]. Acta Mineralogica Sinica, 2000, 20(3):257-263.]
[24] 威尔逊R C L.层序地层学概述[J].地层学杂志,1994,18(1):78-80. [Wilson R C L.Sequence Stratigraphy Introduction[J]. J.Stratigr.,1994, 18(1):78-80.]
[25] 林瑞芬,卫克勤,程致远,等.新疆玛纳斯湖沉积柱样的古气候古环境研究[J].地球化学,1996,25(1):63-72. [LIN Rui-fen,WEI Ke-qin, Gasse F, et al. A palaeoclimatic study on lacustrine cores from Manas Lake, Xinjiang, western China[J]. Geochinmica, 1996, 25(1):63-72.]
[26] 黄镇国,张伟强,陈特固.香港地区晚第四纪环境的几个问题[J].热带地理,1997,17(2):157-163. [HUANG Zhen-guo, ZHANG Wei-qiang,CHEN Te-gu. On the Late Quaternary environment in Hong Kong area[J]. Tropical Geography, 1997, 17(2):157-163.]
[27] 温孝胜,赵焕庭,张乔民,等.伶仃洋钻孔岩心的沉积特征及环境演化[J].海洋学报,1997,19(2):121-128. [WEN Xiao-sheng,ZHAO Huan-ting,ZHANG Qiao-min,et al.Sediment characteristic and environmental changes of the core in Lingding Sea[J]. Acta Oceanologica Sinica, 1997, 19(2):121-128.]
[28] 王开发,蒋辉,张玉兰,等.南海及沿岸地区第四纪孢粉藻类与环境[M].上海:同济大学出版社,1990:32-43.[WANG Kai-fa, JIANG Hui, ZHANG Yu-lan, et al. Analysis of Quaternary sporopollen algae and environment in the South China Sea and the coastal area[M]. Shanghai:Tongji University Press, 1990:32 -43.]
[29] 黄镇国,张伟强,蔡福祥,等.华南末次冰期盛期最低海平面问题[J].地理学报,1995,50(5):385-393. [HUANG Zhen-guo, ZHANG Wei-qiang, CAI Fu-xiang,et al. On the lowest sea level during the culmination of the Latest Glacial Period in South China[J]. Acta Geographica Sinica, 1995, 50(5):385-393.]
计量
- 文章访问数: 1420
- HTML全文浏览量: 129
- PDF下载量: 10
下载:
