DOI: 10.3724/SP.J.1140.2013.06001

Marine Geology & Quaternary Geology (海洋地质与第四纪地质杂志) 2013/33:6 PP.1-7


Grain-size analysis is carried out for the 95surface sediment samples from the southwestern part of the South China Sea(3°56′~11°53′N,108°30′~113°47′E),where clayey silt and silty clay dominate,with sand and silty sand only occurred in the most southwestern shallow part.There shows a trend of decreasing grain-size,increasing sorting and decreasing skewness from the shallow water to deeper water.The Kriging method was employed to insert data of the grain-size parameters(mean grain-size,sorting coefficient and skewness),and then the trend analysis was carried out for the interpolated data using the GSTA program.It is revealed that the seabed topography plays a key role in the sediment transport.There is a topographic high in the area including the Guang-ya submarine plateau,the Nan-wei-tan plateau,and the Yong-shu-bei submarine plateau.To the north of the high,sediments from the western South China Sea continental shelf are transported into the Southwest Basin of South China Sea;to the south of the boundary,however,materials from the Sunda shelf and the Kalimantan Island are transported into the Nan-wei-xi and Bei-kang slope basin passing by the shelf break.The episodic sedimentary events,such as the turbidity current,also have significant impacts on the grain-size distribution pattern.The aggregation of the components8μm should not be ignored.Further researches are required for details.

Key words:surface sediments,grain-size distribution,transport trend analysis,the southwestern part of the South China Sea

ReleaseDate:2016-08-31 18:47:05

[1] 金庆焕.南海地质与油气资源[M].北京:地质出版社,1989. [JIN Qinghuan.Geology,Oil and Gas Resources in the South China Sea[M].Beijing:Geological Publishing House,1989.]

[2] 刘昭蜀,赵焕庭,范时清,等.南海地质[M].北京:科学出版 社,2002.[LIU Zhaoshu,ZHAO Huanting,FAN Shiqing,et al.Geology of the South China Sea[M] .Beijing:Science Press,2002.]

[3] WANG Pianxian,LI Qianyu.The South China Sea Paleocean-ography and Sedimentology[M].Springer,2009.

[4] 张富元,章伟艳,杨群慧.南海东部海域沉积物粒度分布特征 [J].沉积学报,2003,21(3):452-460.[ZHANG Fuyuan, ZHANG Weiyan,YANG Qunhui.Characteristics of grain size distributions of surface sediments in the eastern South China Sea[J].Acta Sedimentologica Sinica,2003,21(3):452-460.]

[5] 吴时国,罗又郎.南海南部大陆架的残留沉积[J].热带海洋, 1994,13(3):47-52.[WU Shiguo,LUO Youlang.The relic sediments in the south shelf of South China Sea[J].Tropic Oceanology,1994,13(3):47-52.]

[6] 李粹中.南海中部沉积物类型和沉积作用特征[J].东海海洋, 1987,5(1-2):10-18.[LI Cuizhong.Sediment types and sedi-mentation of central South China Sea[J].Donghai Marine Sci-ence,1987,5(1-2):10-18.]

[7] 罗又郎,劳焕年,王泳漪.南海东北部表层沉积物类型与粒度特 征的初步研究[J].热带海洋, 1985,4(1):33-41.[LUO You-lang,LAO Huannian,WANG Yongyi.A preliminary study on the surface sediment types and their grain size characteris-tics of the northeastern part of the South China Sea[J].TropicOceanology,1985,4(1):33-41.]

[8] 邱燕,钟和贤,刘坚.南海中南部表层沉积物类型、分布与水动 力条件[J].南海地质研究,2009: 1-12.[QIU Yan,ZHONG Hexian,LIU Jian.Type,distribution and hydrodynamic con-dition of seafloor sediments in the middle and southern part of South China Sea[J].Geological South China Sea,2009:1-12.]

[9] Boulay S,Colin C,Trentesaux A,et al.Sedimentary respon-ses to the Pleistocene climatic variations recorded in the South China Sea[J].Quaternary Research,2007,68:162-172.

[10] Wan Shiming,Li Anchun,Stuut Jan-Berend W,et al.Grain-size records at ODP Site 1146from the northern South China Sea:Implications on the East Asian monsoon evolution since 20Ma[J].Science in China(Series D:Earth),2007,50 (10):1536-1547.

[11] Chen Muhong,Zheng Fan,Lu Jun,et al.Original compo-nent of grain size index in core sediment from southwestern slope of the South China Sea and its paleoenvironmental im-plication[J].Chinese Science Bulletin,2005,50(9):896-902.

[12] Jie Huang,Anchun Li,Shiming Wan.Sensitive grain-size re-cords of Holocene East Asian summer monsoon in sediments of northern South China Sea slope[J].Quaternary Research, 2011,75:734-744.

[13] Chen Guocheng,Zheng Hongbo,Li Jianru,et al.Dynamic control on grain-size distribution of terrigenous sediments in the western South China Sea:Implication for East Asian monsoon evolution[J].Chinese Science Bulletin,2008,53 (10):1533-1543.

[14] 高抒.沉积物粒径趋势分析:原理与应用条件[J].沉积学报, 2009,27(5):826-836.[GAO Shu.Grain size trend analysis: Principle and applicability[J].Acta Sedimentologica Sinica, 2009,27(5):826-836.]

[15] Poizot E,Mear Y,Thomas M,et al.The application of geostatistics in defining the characteristic distance for grain size trend analysis[J].Computers &Geosciences,2006,32: 360-370.

[16] 谢昕,郑洪波,陈国成,等.古环境研究中深海沉积物粒度测试 的预处理方法[J].沉积学报,2007,25(5):684-692.[XIE Xi,ZHENG Hongbo,CHEN Guocheng,et al.Pretreatment method of grain size measurement of marine sediments in pa-leoenvironment research[J].Acta Sedimentologica Sinica, 2007,25(5):684-692.]

[17] Folk R L,Ward W C.Brazos River bar:a study in the sig-nificance of grain size parameters[J].Journal of Sedimentary Petrology,1957,27:3-26.

[18] Shepard F P.Nomenclature based on sand-silt-clay ratios [J].Journal of sedimentary Petrology,1954,24(3):151-158.

[19] Gao S,Collins M.A critique of the McLaren method for defi-ning sediment transport paths:discussion[J].Journal of Sed-imentary Petrology,1991,61(1),143-146.

[20] Gao S,Collins M.Sand sediment transport patterns inferred from grain-size trends based upon definition of"transport vec-tors"[J].Sedimentary Geology,1992,80,47-60.

[21] Gao S,Collins M.Analysis of grain size trends,for defining sediment transport pathways in marine environments[J]. Journal of Coastal Research,1994,10(1):70-78.

[22] Gao S.A Fortran program for grain-size trend analysis to de-fine sand sediment transport pathways[J].Computers &Ge-osciences,1996,22(4),449-452.

[23] 贾建军,程鹏,高抒.利用插值试验分析采样网格对粒度趋 势分析的影响[J].海洋地质与第四纪地质, 2004,24(3): 135-141.[JIA Jianjun,CHENG Peng,GAO Shu.Comparison between grain size trends derived from irregular and regular sampling grids with the help of GIS interpolation tools[J]. Marine Geology and Quaternary Geology, 2004,24(3):135-141.]

[24] Sahu K B.Depositional mechanisms from the size analysis of clastic sediments[J].Journal of Sedimentary Petrology, 1964,34(1):73-8.

[25] 陈弘,邱燕,钟和贤,等.南海西南海盆晚更新世以来沉积物粒 度特征与成因分析[J].南海地质研究, 2004:66-74.[CHEN Hong,QIU Yan,ZHONG Hexian,et al.Characteristics of grain size of core sediments in the southwest basin of South China Sea[J].Geological South China Sea,2004:66-74.]

[26] McCave I N,Manighetti B,Robinson S G.Sortable silt and fine sediment size/composition slicing:Parameters for palae-ocurrent speed and palaeoceanography[J].Paleoceanogra-phy,1995,10(3):593-610.

[27] Chang T S,Joerdel O,Flemming B W,et al.The role of particle aggregation/disaggregation in muddy sediment dy-namics and seasonal sediment turnover in a back-barrier tidal basin,East Frisian Wadden Sea,southern North Sea[J]. Marine Geology,2006,235:49-61.

[28] Stevens R L,Bengtsson H,Lepland A.Textural provinces and transport interpretations with fine-grained sediments in the Skagerrak[J].Journal of Sea Research,1996,35(1-3):99-110.