南海中北部表层沉积物的矿物沉积   总被引：10，自引：0，他引：10  

苏广庆  王天行 《台湾海峡》1992,11(2):118-124

本文研究了南海中北部500多个样品的矿物学。认为,本区表层沉积物中矿物种类繁多,分布较为普遍,碎屑矿物(含火山物质)、粘土矿物、自生矿物常有出现。以前者为最显著(共60多种,其中重矿物50多种,轻矿物近10种),主要分布于陆架区及深海盆;粘土矿物次之,多分布于陆坡～深海盆;自生矿物较少,陆架～深海盆均有分布。文中根据矿物沉积特征和环境差异,把它划分为6个矿物区。  相似文献   

Circalittoral Macrobenthic Assemblages of Strymonikos Gulf (North Aegean Sea)   总被引：1，自引：0，他引：1  

Costas G.  Dounas Athanasios S.  Koukouras 《Marine Ecology》1992,13(2):85-99

Abstract. Six macrobenthic assemblages of the circalittoral zone found in Strymonikos Gulf, North Aegean Sea, are described and compared with the corresponding ones from other Mediterranean and Atlantic areas. For the delimination of these assemblages and the evaluation of the major environmental gradients governing their distribution, several numerical techniques were used.  相似文献   

Crustal Structures of the Northernmost South China Sea: Seismic Reflection and Gravity Modeling   总被引：2，自引：0，他引：2  

Yi-Ching Yeh  Shu-Kun Hsu 《Marine Geophysical Researches》2004,25(1-2):45-61

The South China Sea (SCS) is a marginal sea off shore Southeast Asia. Based on magnetic study, oceanic crust has been suggested in the northernmost SCS. However, the crustal structure of the northernmost SCS was poorly known. To elaborate the crustal structures in the northernmost SCS and off southwest Taiwan, we have analyzed 20 multi-channel seismic profiles of the region. We have also performed gravity modeling to understand the Moho depth variation. The volcanic basement deepens southeastwards while the Moho depth shoals southeastwards. Except for the continental margin, the northernmost SCS can be divided into three tectonic regions: the disturbed and undisturbed oceanic crust (8–12 km thick) in the southwest, a trapped oceanic crust (8 km thick) between the Luzon-Ryukyu Transform Plate Boundary (LRTPB) and Formosa Canyon, and the area to the north of the Formosa Canyon which has the thickest sediments. Instead of faulting, the sediments across the LRTPB have only displayed differential subsidence offset of about 0.5–1 s in the northeast side, indicating that the LRTPB is no longer active. The gravity modeling has shown a relatively thin crust beneath the LRTPB, demonstrating the sheared zone character along the LRTPB. However, probably because of post-spreading volcanism, only the transtension-shearing phenomenon of volcanic basement in the northwest and southeast ends of the LRTPB can be observed. These two basement-fractured sites coincide with low gravity anomalies. Intensive erosion has prevailed over the whole channel of the Formosa Canyon.  相似文献   

Pelagic fish abundance in relation to regional environmental variation in the Gulf of Finland, northern Baltic Sea     

Peltonen  Heikki; Luoto  Miska; Paakkonen  Jari-Pekka; Karjalainen  Miina; Tuomaala  Antti; Ponni  Jukka; Viitasalo  Markku 《ICES Journal of Marine Science》2007,64(3):487-495

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Contribution of Sponge Spicules to the Composition of Biogenic Silica in the Ligurian Sea     

Giorgio  Bavestrello  Riccardo  Cattaneo-Vietti  Carlo  Cerrano  Stefania  Cerutti Michele  Sará 《Marine Ecology》1996,17(1-3):41-50

Abstract. The importance of sponge spicules in the turnover of biogenic silica (BSi) in the detritic bottoms of the Eastern Ligurian Riviera was evaluated by studying sediment cores and the detrital matter collected by a trap over a one year period.
This study made evident that: i) Sponge spicules represent the main component of the BSi both in the sediments and in the trapped matter; ii) A correlation exists between the sponge biomass present on the overhanging cliff and the amount of sponge spicules found in the sediment below; iii) Inside the sediments, a superficial layer (10 cm deep) characterized by intensive silica dissolution processes can be observed; and iv) The amount of spicules collected using the trap is not constant throughout the year, but shows a characteristic trend with low values in spring and summer and high values in autumn and winter.  相似文献   

Comparison among four kinds of data of sea surface wind stress in the South China Sea   总被引：1，自引：0，他引：1  

Xie Qiang  Wang Weiqiang  Mao Qingwen 《海洋学报(英文版)》2002,21(2):263-273

By using remote sensing (ERS) data, FSU data, COADS data and Hellerman & Rosen-stein objective analysis data to analyze the sea surface wind stress in the South China Sea, it is found that the remote sensing data have higher resolution and more reasonable values. Therefore we suggest that remote sensing data be chosen in the study of climatological features of sea surface wind stress and its seasonal variability in the South China Sea, especially in the study of small and middle scale eddies.  相似文献   

南沙群岛海域水体漫衰减系数Kd(490)的特性研究   总被引：6，自引：1，他引：6  

张清凌  陈楚群  施平 《热带海洋学报》2003,22(1):9-16

对南沙群岛海区水体Kd(490）的特性进行了深入分析和探讨,研究结果表明：Kd（490）的垂直分布与同步测量的海水叶绿素a浓度的垂直分布有很强的相关性;Kd（490）的垂直分布反映出该区域海水存在较强的分层现象,研究中还发现上行辐亮度漫衰减系数KL（490）与Kd（490）垂直变化趋势相当一致,但是以二者达到最大值的深度为界,上层水体的KL（490）值稍大于Kd(490）值,在这一深度以下则相反。  相似文献   

非线性共轭梯度法在东海黑潮流计算中的应用   总被引：4，自引：0，他引：4  

陈红霞  袁业立  刘娜  曲媛媛 《海洋学报》2003,25(6):31-38

基于现有的几种海流计算方法,根据与P矢量法相同的动力特性和内在假设,对海流计算提出了一种简单、高效、易扩展、适用范围广的新方法:非线性共轭梯度法.利用1989年4月以来的"中日黑潮合作调查研究"6个航次的CTD资料,对东海黑潮流区域应用非线性共轭梯度法进行了海流计算.通过与船载ADCP实测结果比较表明,非线性共轭梯度法是可行的.  相似文献   

Hydrothermal Metalliferous Sediments and Waters Off the Lesser Antilles     

A. Johnson  D. S. Cronan 《Marine Georesources & Geotechnology》2001,19(2):65-83

Considerable metal enrichments have been found in hydrothermal fluids and metalliferous sediments off the central Lesser Antilles Volcanic Arc. The elements variably enriched in the fluids as a result of the hydrothermal activity are Fe, Mn, As, Si, B, Li and in the sediments, Fe, P, Mo, As, Sb, Hg, Cu and Pb. Variations in the concentrations of these elements in both fluids and sediments along the arc result from a number of factors, the most important of which is the stage that each island's volcano has reached in its eruptive cycle. Although hydrothermal mineralization on the sea floor off the islands is only low grade, phase separation in the hydrothermal fluids at depth could be leading to higher grade stockwork mineralization below the vent fields or the discharge of metal rich brines on the lower flanks of the volcanic islands.  相似文献   

南海晚第四纪硅藻遗体及其地质意义Ⅵ.硅藻的2个新种和7个新记录     

程兆第  蓝东兆 《台湾海峡》1995,14(1):40-43

本文记述了南海晚第四纪沉积物中发现的两个新种[线形辐环藻（Actinocyclus lineatus Liu,Cheng et Lan sp.nov.）、星圆筛藻（Coscinodiscus aster-aeus Cheng,Liu et Lan sp.nov.）]以及在我国首次记录的圆筛藻的7个种。  相似文献