帮助 关于我们

返回检索结果

冲绳海槽中全新世的浊流沉积及其控制因素
THE TURBIDITY EVENTS IN OKINAWA TROUGH DURING MIDDLE HOLOCENE AND ITS POTENTIAL DOMINATING MECHANISMS

查看参考文献63篇

文摘 浊流沉积是陆源物质向深海搬运的主要方式,其发生对于海底扇、峡谷以及深海油气藏的形成具有重要意义。对冲绳海槽3个柱状样岩芯的研究,均发现了发生于7300?7500cal.a B.P.的浊流层。这3个浊流层S1,S2和S3的发生伴随着粒度、粘土矿物以及log(Ti/Ca)的明显变化。浊流沉积层相比正常沉积层具有粗粒组分峰值较高以及下覆的不整合构造,粒度上呈现由粗到细的正粒序构造。伴随着粒度的变化,log(Ti/Ca)也发生明显增大。A7孔位的S2浊流层的底部以及Oki01孔位的S3浊流层的上部含有火山灰层,火山玻璃含量约为80%左右。火山灰层的粒度众数约24~32μm的单峰分布。通过对比其他古气候、古环境指标,发现7300~7500 cal.a B.P.的浊流事件可能与活跃的火山地震作用以及冬季风明显增强有关。
其他语种文摘 Turbidity currents are the principal mode of transportation of clastic sediment to deep sea. The occurrence of turbidity play an important role in the formation of submarine fan,canyon and deep-sea oil. In short term, earthquake, volcano activity and internal tide are regarded as the initiation process of turbidity activity. In long term,the variation of regional climate,sea level and ocean current control the sediment supply and pore pressure, thus, initiate the turbidity currents. The Okinawa Trough is a typical curved basin behind the Ryukyu Arc of the northwestern Pacific. Turbidity is common in Okinawa Trough due to the frequent earthquake and volcano activity. During the last glacial, the global sea level was relatively low; the climate was cooler and drier than the present, which led to the exposure of East China Sea continental shelf and the progradation of coastline. However, Okinawa Trough had still been submerged and recorded the environmental changes in the area. A series of submarine canyons distributing around the west slope of middle Okinawa Trough have been found by Chinese's scholars by using multi-beam bathymetric and high resolution seismic survey. The distribution of canyons at the west slope of Okinawa Trough provides a favorable channel for facilitating sediments from the shelf area to the Okinawa Trough. Three sediment cores Oki02 (26. 07°N, 125.25°E; 4. 9m in length), A7 (27. 82°N, 126. 98°E; 4. 6m in length),Oki01 (28. 33°N, 127. 26°E; 3. 8m in length) were retrieved from the middle Okinawa Trough at water depth of 1612m, 1264m and 1010m, respectively. These three cores are distributed around the west slope, where is under the influence of Kuroshio Current main stream. In this study, we emphasized on the Holocene interval of three cores, including upper 250cm of core Oki02, upper 200cm of Core A7 and upper 280cm of core Oki01, to reconstruct the turbidity events since the Holocene, by using grain size, clay mineral, bulk elemental ratios and scanning electron microscopy (SEM) analysis. We have identified turbidity layers basing on the theory proposed by Shanmugam,who defines the turbidity sediment as the layer with normal grading and unconformity. After detailed analysis, we found that three turbidity events S1 (152 ?160cm),S2(110~ 120cm),and S3 (182 ~ 202cm) occurred coincidently during 7300?7500cal.a B.P. in these three cores. The occurrence of turbidity layers S1,S2, and S3 accompanied by the synchronous change of median grain size, clay mineral, and log(Ti/Ca) ratios. The median grain size and log (Ti/Ca) increased abruptly, while the clay mineral source shifted from mainly Taiwan and East China Sea continental shelf to Yellow and Yangtze River correspondingly. The scanning electron microscopy analysis shows that the turbidity layers are mainly composed of coarser grain detrital material,including feldspar, quartz and heavy mineral. Compared with normal sediment layers, the turbidity layers have coarser grain size peak, unconformity structure, and normal grading bed sequence. Furthermore, there are volcano ashes layers with around 80%~ 90% volcano glass above S3 turbidity layers of Core Oki01 and underlying S2 turbidity layers of A7, which have 24~32μm unimodal grain size distribution. The turbidity layers also contain 10%?20% volcano ash. The interbed of volcano ash with turbidity layers indicates that the occurrence of turbidity layers may be related to the volcano activity. Comparison between our records and other paleoceanography and paleoclimate proxies suggest that active volcano, earthquake and the enhancement of sediment delivery triggered by stronger East Asian winter monsoon may be the main reasons for the coincidently wide occurrence of turbidities in Okinawa Trough during 7300?7500cal.a B.P.
来源 第四纪研究 ,2014,34(3):579-589 【核心库】
关键词 浊流 ; 火山 ; 冬季风 ; 黑潮 ; 冲绳海槽
地址

中国科学院海洋研究所, 中国科学院海洋地质与环境重点实验室, 青岛, 266071

语种 中文
文献类型 研究性论文
ISSN 1001-7410
学科 地质学;海洋学
基金 中国科学院战略性先导科技专项 ;  国家自然科学基金项目
文献收藏号 CSCD:5143885

参考文献 共 63 共4页

1.  Piper David J W. Processes that initiate turbidity currents and their influence on turbidites : A marine geology perspective. Journal of Sedimentary Research,2009,79(6):347-362 被引 24 次    
2.  Shanmugam G. Comparison of turbidite facies associations in modern passive-margin Mississippi fan with ancient active-margin fans. Sedimentary Geology,1988,58(1):63-77 被引 18 次    
3.  Shanmugam G. Leaves in turbidite sands : The main source of oil and gas in the deep-water Kutei basin, Indonesia : Discussion. AAPG Bulletin,2008,92(1):127-137 被引 4 次    
4.  Zuffa G G. Turbidite megabeds in an oceanic rift valley recording Jokulhlaups of Late Pleistocene glacial lakes of the western United States. The Journal of Geology,2000,108(3):253-274 被引 5 次    
5.  Lamb Michael P. Surging versus continuous turbidity currents : Flow dynamics and deposits in an experimental intraslope minibasin. Journal of Sedimentary Research,2004,74(1):148-155 被引 3 次    
6.  Felix M. Transformation of debris flows into turbidity currents: Mechanisms inferred from laboratory experiments. Sedimentology,2006,53(1):107-123 被引 33 次    
7.  Khripounoff Alexis. Direct observation of intense turbidity current activity in the Zaire submarine valley at 4000m water depth. Marine Geology,2003,194(3):151-158 被引 20 次    
8.  Xu J P. In-situ measurements of velocity structure within turbidity currents. Geophysical Research Letters,2004,31(9):L09311 被引 12 次    
9.  Orange Daniel L. The effects of fluid escape on accretionary wedges 2. Seepage force, slope failure, headless submarine canyons, and vents. Journal of Geophysical Research,1992,97(B6):9277-9295 被引 7 次    
10.  Nisbet Euan G. Giant submarine landslides. Nature,1998,392(6674):329-330 被引 17 次    
11.  Pierau Roberto. Late Quaternary climatic events and sea-level changes recorded by turbidite activity, Dakar Canyon, NW Africa. Quaternary Research,2010,73(2):385-392 被引 3 次    
12.  Hanebuth Till J J. Recurrent decadal-scale dust events over Holocene western Africa and their control on canyon turbidite activity (Mauritania). Quaternary Science Reviews,2009,28(3):261-270 被引 5 次    
13.  赵玉龙. 南海南部末次冰期浊流沉积的高分辨率沉积学和地球化学研究. 科学通报,2011,56(31):2535-2543 被引 6 次    
14.  党皓文. 西菲律宾海末次冰期以来的浊流沉积及其古环境意义. 第四纪研究,2009,29(6):1078-1085 被引 8 次    
15.  Sibuet Jean Claude. Okinawa Trough backarc basin : Early tectonic and magmatic evolution. Journal of Geophysical Research,1998,103(B12):30245-30267 被引 57 次    
16.  李军. 冲绳海槽南部A23孔浊流沉积层的粒度特征. 海洋地质与第四纪地质,2005,25(2):11-16 被引 6 次    
17.  Wei Kuo Yen. LEG 195 synthesis : Site 1202—Late Quaternary sedimentation and paleoceanography in the Southern Okinawa Trough. Proceedings of the Ocean Drilling Program, Scientific Results,2006,195(3):1-31 被引 1 次    
18.  李巍然. 冲绳海槽浊流灾害性研究. 自然灾害学报,1999,8(3):98-102 被引 9 次    
19.  袁迎如. 冲绳海槽的浊流沉积物. 地质论评,1987,33(6):499-505 被引 8 次    
20.  南青云. 南冲绳海槽7000aB.P.以来基于长链不饱和烯酮指标的古海洋生产力变化及其与气候的关系. 第四纪研究,2008,28(3):482-490 被引 16 次    
引证文献 9 篇

1 李冬玲 南冲绳海槽沉积物中淡水硅藻的发现及1000年以来台风降雨的重建 第四纪研究,2015,35(3):755-766
被引 5 次

2 姜韬 全新世以来冲绳海槽北部S9孔粒度变化特征及其古气候响应 第四纪研究,2015,35(2):307-318
被引 16 次

显示所有9篇文献

论文科学数据集
PlumX Metrics
相关文献

 作者相关
 关键词相关
 参考文献相关

iAuthor 链接
万世明 0000-0001-9335-2248
版权所有 ©2008 中国科学院文献情报中心 制作维护：中国科学院文献情报中心
地址：北京中关村北四环西路33号 邮政编码：100190 联系电话：(010)82627496 E-mail:cscd@mail.las.ac.cn 京ICP备05002861号-4 | 京公网安备11010802043238号