MODERN SEDIMENTATION RATES IN THE BEIBU GULF
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摘要: 运用210Pb法测定了北部湾16根柱样的现代沉积速率,结果显示北部湾柱样210Pb剖面分布呈现三段式正常型、二段式正常型和倒置型3种类型,主要受沉积物组成、沉积物供应和水动力条件控制。北部湾东侧现代沉积速率相对较高的区域分布在钦州湾附近20 m水深以浅的地区和涠洲岛至海南岛西岸一线外水深20~50 m的内陆架。而在海南岛西岸水下岸坡带、琼州海峡西口附近和北部湾顶东北角这3处强潮区,现代沉积强度可能较弱或无现代细粒沉积。在北部湾中部50 m水深以深,由于物质供应匮乏,现代沉积速率也极低。北部湾东侧存在由环流驱动的沉积物"传送带",自南向北运动,其西边界在琼州海峡一线以南是在50 m等深线附近,以北是在109°E附近,冬季可能略向西拓展。Abstract: Modern sedimentation rates for 16 cores recovered from the Beibu Gulf were measured with the 210Pb method. The results show that there are 3 types of 210Pb vertical distribution patterns, say, normal 3-segment, normal 2-segment and inversion types, depending upon the composition and sediment supply as well as sediment dynamics. In the eastern part of the gulf, relatively high sedimentation rates appeared in the area near the Qinzhou Bay at a water depth less than 20 m and the inner continental shelf south to Weizhou Island, west Hainan Island at a water depth between 20 m and 50 m. The modern sedimentation rates, however, are low on the west subaqueous slop of Hainan Island, the west mouth of Qiongzhou Strait and the northeastern corner of the gulf due to strong tide. The area in a water depth more than 50 m in the central part of the gulf has low modern sedimentation rates due to poor sediment supply. It seems that there is a sediment conveyor belt driven by the anti-clock circumfluence on the east side of Beibu Gulf, which transports fine sediment from south to north. The circumfluence is bordered to the west by the south of Qiongzhou Strait along the 50 m isobaths and to the north by the Qiongzhou Strait near 109°E. The border may move westward a little in winter time.
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Keywords:
- modern sedimentation rate /
- sedimentary environment /
- 210Pb /
- Beibu Gulf
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[1] 夏华永,李树华,侍茂崇.北部湾三维风生流及密度流模拟[J].海洋学报,2001,23(6):11-22. [XIA Huayong,LI Shuhua,SHI Maochong.A 3D numerical simulation of wind-driven currents in the Beibu Gulf[J].Acta Oceanologica Sinica,2001,23(6):11-22.]
[2] 陈俊仁.南海北部内陆架表层沉积物沉积环境的讨论[J].海洋地质与第四纪地质,1983,3(2):27-37. [CHEN Junren. Review on the sedimentary environment of the surface sediments on the inner continental shelf in the northern part of South China Sea[J].Marine Geology and Quaternary Geology,1983,3(2):27-37.]
[3] 陈俊仁,郑祥民.南海北部内陆架沉积物来源及控制因素的研究[J].海洋学报,1985,7(5):579-589. [CHEN Junren,ZHENG Xiangmin.The sources and control factors of sediment on the northern inner continental shelf of South China Sea[J].Acta Oceanologica Sinica,1985,7(5):579-589.]
[4] 马菲,汪亚平,李炎,等.地统计法支持的北部湾东部海域沉积物粒径趋势分析[J].地理学报,2008,63(11):1207-1217. [MA Fei,WANG Yaping,LI Yan,et al.The application of geostatistics to analysis of grain size trend in the eastern Beibu Gulf[J].Acta Geographica Sinica,2008,63(11):1207-1217.]
[5] 徐志伟,汪亚平,李炎,等.多元统计及物源分析支持的北部湾东部海域沉积物输运趋势[J].海洋学报,2010,32(3):67-78. [XU Zhiwei,WANG Yaping,LI Yan,et al.Sediment transport patterns in the eastern Beibu Gulf based on grain-size multivariate statistics and provenance analysis[J].Acta Oceanologica Sinica,2010,32(3):67-78.]
[6] 陈丽蓉,张秀荣.北部湾沉积物中矿物组合及其分布特征[J].海洋学报,1986,8(3):340-346. [CHEN Lirong,ZHANG Xiurong.The mineral assemblages and distribution characters of sediment in the Beibu Gulf[J].Acta Oceanologica Sinica,1986,8(3):340-346.]
[7] 李凤业,高抒,贾建军,等.黄、渤海泥质沉积区现代沉积速率[J].海洋与湖沼,2002,33(4):364-369. [LI Fengye,GAO Shu,JIA Jianjun,et al.Contemporary deposition rates of fine-grained sediment in the Bohai and Yellow Seas[J].Oceanologia et Limnologia Sinica,2002,33(4):364-369.]
[8] 王福,王宏,李建芬,等.渤海地区210Pb、137Cs同位素测年的研究现状[J].地质评论,2006,52(2):244-250. [WANG Fu,WANG Hong,LI Jianfen,et al.Current study of 210Pb and 137Cs geochronology in the circum-Bohai Sea region[J].Geological Review,2006,52(2):244-250.]
[9] 段凌云,王张华,李茂田,等.长江口沉积物210Pb分布及沉积环境解释[J].沉积学报,2005,23(3):514-520. [DUAN Lingyun,WANG Zhanghua,LI Maotian,et al.210Pb distribution of the Changjiang estuarine sediment and the implications to sedimentary environment[J].Acta Sedimentologica Sinica,2005,23(3):514-520.]
[10] 张志忠,李双林,董岩翔,等.浙江近岸海域沉积物沉积速率及地球化学[J].海洋地质与第四纪地质,2005,25(3):15-23. [ZHANG Zhizhong,LI Shuanglin,DONG Yanxiang,et al.Deposition rate and geochemical characters of sediments in Zhejiang offshore[J].Marine Geology and Quaternary Geology,2005,25(3):15-23.]
[11] 刘升发,石学法,刘焱光,等.东海内陆架泥质区沉积速率[J].海洋地质与第四纪地质,2009,29(6):1-7. [LIU Shengfa,SHI Xuefa,LIU Yanguang et al.Sedimentation rate of mud area in the East China Sea inner continental shelf[J].Marine Geology and Quaternary Geology,2009,29(6):1-7.]
[12] 陈耀泰,罗章仁.珠江口现代沉积速率及其反映的沉积特征[J].热带海洋,1991,10(2):57-64. [CHEN Yaotai,LUO Zhangren.Modern sedimentary velocity and their reflected sedimentary characteristics in the Pearl River mouth[J].Tropic Oceanology,1991,10(2):57-64.]
[13] 林瑞芬,闵育顺,卫克勤,等.珠江口沉积柱状样210Pb法年龄测定结果及其环境地球化学意义[J].地球化学,1998,27(5):401-410. [LIN Ruifen,MIN Yushun,WEI Keqin,et al.210Pb-dating of sediment cores from the Pearl River mouth and its environmental geochemistry implication[J].Geochimica,1998,27(5):401-410.]
[14] 张祖麟,陈宗团,徐立,等.珠江口外伶仃洋的现代沉积速率及重金属污染[J].海洋通报,1998,17(3):53-57. [ZHANG Zulin,CHEN Zongtuan,XU Li,ea al.Modern sedimentary rate and heavy metal pollution in the Pearl River estuary[J].Marine Science Bulletin,1998,17(3):53-57.]
[15] 刘志勇,潘少明,程功弼,等.珠江口沉积物210Pb分布特征及环境意义[J].沉积学报,2010,28(1):166-175. [LIU Zhiyong,PAN Shaoming,CHENG Gongbi,et al.210Pb characteristic in the sediment cores from the Pearl River mouth and its environment implication[J].Acta Sedimentologica Sinica,2010,28(1):166-175.]
[16] 全亚荣,梁致荣,刘彝筠,等.海口、新海湾210Pb法沉积速率的测定[J].中山大学学报:自然科学版,1995,34(1):90-95. [QUAN Yarong,LIANG Zhirong,LIU Yijun,et al.The determination of depositional rate on the Haikou and Xinhai Bays by 210Pb method[J].Acta Scientlarum Naturalium Universitatis Sunyatseni,1995,34(1):90-95.]
[17] 潘少明,王雪瑜,John N Smith.海南岛洋浦港现代沉积速率[J].沉积学报,1994,12(2):86-92. [PAN Shaoming,WANG Xueyu,John N Smith.Recent sedimentation rates in Yangpu Harbour on Hainan Island[J].Acta Sedimentologica Sinica,1994,12(2):86-92.]
[18] 潘少明,施晓东,John N Smith.海南岛三亚港现代沉积速率的研究[J].海洋与湖沼,1995,26(2):132-137. [PAN Shaoming,SHI Xiaodong,John N Smith.Determination of recent sedimentation rates in Sanya Harbour, Hainan Island[J].Oceanologia et Limnologia Sinica,1995,26(2):132-137.]
[19] 王颖,朱大奎.海南岛洋浦湾沉积作用研究[J].第四纪研究,1996(2):159-165.[WANG Ying,ZHU Dakui.Sedimentary processes in Yangpu Bay, Hainan Island, China[J].Quaternary Sciences,1996 (2):159-165.]
[20] 许冬,龙江平,钱江初,等.海南岛近海海域7个沉积岩心的现代沉积速率及其分布特征[J].海洋学研究,2008,26(3):9-17. [XU Dong,LONG Jiangping,QIANG Jiangchu,et al.The modern sedimentation rate and the distribution character of 7 cores in Hainan Island offshore[J].Journal of Marine Sciences,2008,26(3):9-17.]
[21] 李凤业.用210Pb法测定南海陆架浅海沉积速率[J].海洋科学,1988(3):64-66.[LI Fengye.Determination of recent sedimentation rates by 210 Pb method in the South China Sea[J].Marine Science,1988(3):64-66.]
[22] van den Bergh G D, Boer W, Schaapveld M A S, et al. Recent sedimentation and sediment accumulation rates of the Ba Lat prodelta(Red River, Vietnam)[J]. Journal of Asian Earth Sciences,2007(29):545-557.
[23] 莫永杰.北部湾北部浅海沉积物的粒度类型[J].热带海洋,1990,9(1):87-93. [MO Yongjie.Grain size types of sediments of the shallow waters in northern Beibu Gulf[J].Tropic Oceanology,1990,9(1):87-93.]
[24] 陈俊仁,冯文科,赵希涛.南海北部-50米古海岸线的初步研究[J].地理学报,1983,38(2):176-187. [CHEN Junren,FENG Wenke,ZHAO Xitao.A preliminary study of the -50m paleocoastline of the northern South China Sea[J].Acta Geographica Sinica,1983,38(2):176-187.]
[25] 刘锡清.中国陆架的残留沉积[J].海洋地质与第四纪地质,1987,7(1):1-14. [LIU Xiqing.Relict sediments in China continental shelf[J].Marine Geology and Quaternary Geology,1987,7(1):1-14.]
[26] 范德江,杨作升,郭志刚.中国陆架210Pb测年应用现状与思考[J].地球科学进展,2000,15(3):297-302. [FAN Dejiang,YANG Zuosheng,GUO Zhigang.Review of 210Pb dating in the continental shelf of China[J].Advance in Earth Sciences,2000,15(3):297-302.]
[27] 高为利,张富元,章伟艳,等.海南岛周边海域表层沉积物粒度分布特征[J].海洋通报,2009,28(2):70-80. [GAO Weili,ZHANG Fuyuan,ZHANG Weiyan,et al.Characteristics of grain size distributions of surface sediments in the Hainan Island offshore area[J].Marine Science Bulletin,2009,28(2):70-80.]
[28] 夏东兴,吴桑云,刘振夏,等.海南东方岸外海底沙波活动性研究[J].黄渤海海洋,2001,19(1):17-24. [XIA Dongxing,WU Sangyun,LIU Zhenxia,et al.Research on the activity of submarine sand waves off Dongfang,Hannan Island[J].Journal of Oceanography of Huanghai & Bohai Seas,2001,19(1):17-24.]
[29] 王文介.中国南海海岸地貌沉积研究[M].广州:广东经济出版社,2007:14.[WANG Wenjie.Study on coastal morphological sedimentation of South China Sea[M].Guangzhou:Guangdong Economy Publishing House,2007:14.] [30] Luu Thi Nguyet Minh, Garnier Josette, et al.Hydrological regime and water budget of the Red River Delta (Northern Vietnam)[J]. Journal of Asian Earth Science,2010(37):219-228.
[31] Thi Phuong Quynh Le, Josette Garnier, et al. The changing flow regime and sediment load of the Red River, Vietnam[J]. Journal of Hydrology.2007(334):199-214.
[32] 黄以琛,李炎,邵浩,等.北部湾夏冬季海表温度、叶绿素和浊度的分布特征及调控因素[J].厦门大学学报:自然科学版,2008,47(6):856-863. [HUANG Yichen,LI Yan,SHAO Hao,et al.Seasonal variations of sea surface temperature, chlorophyll-a and turbidity in Beibu Gulf, MODIS imagery study[J].Journal of Xiamen University (Natural Science),2008,47(6):856-863.]
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