南海东部海域的沉积作用和物质来源研究
Research on sedimentations and material sources in the eastern South China Sea
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摘要: 1998年在南海东部海域采集了195个表层和24个柱状沉积物样,对沉积作用和物质来源研究表明:(1)南海东部海域具有典型的边缘海沉积特征,沉积物主要由陆源碎屑、生物碎屑、火山碎屑、浊流沉积物组成,沉积作用具有多样性;(2)黄岩岛以北海区沉积物中基性岩组分含量为23.2%,陆源硅铝质组分含量为76.8%,这两种组分的理论计算值与海底沉积物实际分布相一致;(3)由碎屑矿物分析得出陆源矿物、混合矿物、自生铁锰矿物和中基性火山矿物四种矿物组合区,矿物组成和含量差异反映了物源和沉积环境的变化;(4)对沉积物中大于0.063 mm的物质全组分分析表明,生源组分占66.97%,其中钙质生物含量为23.43%,硅质生物含量为43.54%,钙质生物高值区主要分布在水深小于3 500 m的海区,硅质生物高值区主要分布在水深大于3 500 m的深水区;(5)南海东部海域火山沉积作用明显,海底扩张区沉积物中铜、钡、铁、锰、钴、镍、砷等金属物质分布与海底构造和海底中基性火山活动密切相关;(6)对沉积物粒度、物质组成和生物化石组合分析表明北部陆坡区69柱187.5~190.0,287.5~280.0,377.5~380.0 cm,深海平原区149柱157~187,187~194 cm,南部陆坡区323柱280~350 cm在粒度上表现出浊流沉积特征;(7)对锶同位素物源示踪和粒度、矿物的研究表明,北部陆源碎屑向南一直扩散到约17 N,西吕宋海槽是亚洲大陆物质特别是我国大陆物质向南海东部海域输运的主要通道.Abstract: One hundred and ninety-five surface sediment samples and 24 piston core samples were collected from the eastern South China Sea in 1998.Based on these samples,the study of sedimentation and sediment source shows that:(1)The eastern South China Sea has the typical sedimentary charecteristics of the marginal sea;the sediments are composed of the terrigenous clasts,biogenous debris,volcaniclasts and turbidity deposits,and sedimentations are multiple origins;(2)the interm ediate-basic constituent of sediments in the north area of Huangyan Island is 23.2% and the terrigeno us fraction is 76.8%,the theoretial estimates of the two com ponents are quite consistent with the distributions of the submarine sediments.;(3)the mineral analysis shows that there are four mineral assemblages of terrigenous minerals, mixed minerals,authigenic ferromanganese minerals and intermediate-basic volcanogenic minerals,and the mineral constituents and content differences reflect the changes of the material sources and the sedimentary environments;(4)the constituent analysis of being greater than 0.063 mm sediments shows biogenous debris is 66.97%,of which the calcareo us fraction and siliceous one are 23.43% and 43.54% respectively.
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Key words:
- eastern South China Sea /
- sedimentation /
- material source /
- Sr isotope
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LISITZIN A R. Sedimentation in the world ocean[J]. Soc Econ Paleontologists and Mineralogists. Spec Pu11,1972,17:218. SUSUMMU H, EMERY K O. SATOSHI Y. Non-combustible suspended matter in surface waters off eastern Asia[J]. Sedimentology,1974,21:555 575. NⅡNO H, EMERGY K O. Sediments of shallow portions of East China and South China Coas[J]. Geol Soc America Bull, 1961,72:731-762. YOSHIKI S, ZUOSHENG Y. The Huanghe River: its water discharge, sediment discharge, and sediment budget[J]. J Sed Soc Japan,1994,40:7-17. 李祥云,陈虹勋,李传荣,等.大亚湾悬浮物和底质的EDAX分析及元素地球化学探讨[A].南海海洋科学集刊:第10集[C].北京:科学出版社,1992.136 158. HORN R A.Marine Chemistry[M].New York:Wiley-Interscience.1969. 陈建芳,郑连福,唐运千,等.中德合作南海现代沉积作用过程研究进展[J].南海研究与开发,1996,3:8-11. 徐鲁强,陈建芳,唐运千,等.南海北部沉降颗粒氨基酸通量及生物地球化学意义[J].海洋学报,1997,19(2):57-11. 王将克,陈水侠,钟月明,等.氨基酸生物地球化学[M].北京:科学出版社,1991.308. BOSTROM K, KRAMEMER T, GANTNER S. Provenace and accumulation rates of opaline silica, Al, Fe, Ti, Mn, Ni and Co in Pacific pelagic sediments[J]. Chemical Geology, 1973,11 (1-2): 123-148. BOSTROM K. The origin of ferromanganese on active ridge sediments[A]. PETER A R,ROBERT P L, ed. Seafloor Spreading Centers Hydrothermal Systems[M]. Stroudsburg, Pennsylvania: Dowden, Hutchingon & Ross, Inc, 1980. 288-332. 张富元.南海表层沉积物中Ba/Cu比值与海底扩张关系[J].海洋学报,1993,15(5):98-103. 张富元.南海中部表层沉积物的元素地球化学[J].海洋与湖沼,1991,22(3):253-263. 冯文科,薛万俊,杨达源.南海北部晚第四纪地质环境[M].广州:广东科学出版社.1988. 杨群慧,林振宏,张富元,等,南海中东部表层沉积物矿物组合分区及其地质意义[J].海洋与糊沼,2002,33(6):591-599. DAMUTH J E.南海盆地北部浊流形成的运移沉积物波[A].庄敏芝译.南海地质译文集:第四纪[C].广州:地质部海洋地质调查局科技情报室,1985.36-41. 孟宪伟,杜德文,陈志华,等.长江、黄河流域泛滥平原细粒沉积物87Sr/86Sr空间变异的制约因素及其物源示踪意义[J].地球化学,2000,29(6):562-569. 韦刚健,桂训唐,于津生,等.南海第四纪海水Sr同位素组成演化[J].海洋地质与第四纪地质,1996,16(2):15-21. RITHER F M,ROWLEG D B,DEPAOLO D J.Srisotope evolution of seawater:the role oftectonics[J].Earth Plant Sci Lett,1992,109:11-23. 李荣西,魏家庸,杨卫东,等.用87Sr/86Sr研究海平面变化与全球对比问题[J].地球科学进展,2000,15(2):729-733. HODELL D A, MEAD G A, MUELLER P A. Variation in the strontium isotopic composition of seawater(8 Ma to present): implications for chemical weathering rates and dissolved fluxes to the oceans[J]. Chemical Geology, 1990,80:291-307. DONALD J DEPAOLO, BONNYE L INGRAM. High-resolution stratigraphy with strontium isotopes[J]. Science, 1985,227: 939-941. DASCH E J,HILLS F A,TUREKIAN K K. Strontium isotope in deep-sea sediments[J]. Science, 1966,153:295-297.
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