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have only displayed differential subsidence offset of about 0.5–1 s in the northeast side, indicating that the LRTPB is no longer active.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   

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   

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   

南海晚第四纪硅藻遗体及其地质意义：Ⅷ.几个问题的讨论     

蓝东兆  程兆第 《台湾海峡》1995,14(3):235-240

本文根据分析结果阐述了两种不同样品处理方法所获得的硅藻丰度和微型硅藻的人主要种类和相对百分含量。研究表明洗涤富集法所获得的硅藻丰度存在较大误差；微型硅藻的含量普遍介于１０％－２０％之间，最高可达４２．３１％，最低为５．６６％，并指出了在微型硅藻相对含量大于２０％的样品中 ，其主要种类为具槽直链藻和条纹小环藻等沿岸底格格不入中，并成群体产出。  相似文献   

Population structure of Haliotis rubra from South Australia inferred from nuclear and mtDNA analyses   总被引：1，自引：0，他引：1  

LI Zhongbao  Sharon A Appleyar  Nicholas G Elliott 《海洋学报(英文版)》2006,25(4):99-112

1Introduction ThemajorityofAustralia’sabalonefisheryex ports(5.135kt,worth＄216millionin2002～2003,ABARE2004)consistofblacklipabalone(HaliotisrubraLeach,1814).AssuchH.rubrais consideredasanimportantmarineresourcewithin Australia.Likemanyabalonespecieswor…  相似文献   

Reproductive Biology of Liocarcinus puber and L holsatus (Decapoda, Brachyura, Portunidae) from the Gower Peninsula, South Wales     

Satish  Choy 《Marine Ecology》1988,9(3):227-241

Abstract. Routine monthly samples of the commercially important portunid crab Liocarcimtx puber and the sympatric but ecologically separated L. holsatus were collected from the waters and shores around the Gowcr Peninsula, South Wales, between November 1983 and September 1985.
The pubertal moult in L. puber occurred at 38 mm CW (carapace width) (females) and 42 mm CW (males). In L. holsatus this occurred at 17 mm (females) and 18.5 mm CW (males). The median size of ovigcrous females was 49.2 ± 6.7 mm CW in L. puber and 26.5 ± 2.0 mm CW in L. holsatus.
Moulting and copulation occurred between spring and autumn, the moulting period of males being earlier than that of the females. Ovigcrous L. holsatus were recorded throughout the year, with highest proportions between February and April. L. puber were ovigcrous mainly between January and March; none was recorded between September and November. The number of eggs of the wild brood (range: 39,000–280,000 for L. holsatus and 40.000–262.000 for L. puber ) was related to female body size as y = 3.099.51 c^0.1126x, r = 0.90, n = 21 and y = 6,335.98 c^0.051x, r = 0.88, n = 23, respectively, where y = number of eggs and x = carapace width (mm).
Following successful copulation, females of both species were able to spawn more than once during an intcrmoult period.  相似文献   

南澎列岛及邻近海域地质地貌与灾害地质分析   总被引：2，自引：1，他引：2  

詹文欢  张乔民  孙宗勋  唐诚  丘学林 《热带海洋学报》2002,21(1):11-17

南澎列岛及邻近海域是广东沿海灾害地质因素较集中和类型较齐全的地区之一。根据野外调查资料，简要地分析了区内地质地貌以及活动断裂、地震活动、地面沉降、滑坡、地裂和沙土液化等基本特征和分布规律，同时还对区内地质灾害进行了初步分析。  相似文献   

南沙群岛海区珊瑚礁灾害性地质分析   总被引：3，自引：0，他引：3  

詹文欢  孙宗勋  张乔民  唐诚 《热带海洋学报》2002,21(2):58-65

珊瑚礁是一种特殊的岩土介质，有独特的灾害地质类型。珊瑚礁灾害地质研究是现代工程地质学的一个新课题。通过珊瑚礁的地质记录研究了内动力灾害地质类型（包括活动断裂、地震和火山活动等）、外动力灾害地质类型（包括海底槽谷与地形突变带、崩塌、滑坡、峰礁与埋藏礁、泥丘、埋藏负地貌等），同时还分析了人类活动对珊瑚礁发育的影响。  相似文献   

利用卫星遥感资料对南海北部陆架海洋表层温度锋的分析   总被引：4，自引：0，他引：4  

王磊  王丽娅  魏皓 《中国海洋大学学报(自然科学版)》2004,34(3):351-357

利用7年(1993～1999)月平均的SST卫星遥感资料，分析了南海北部陆架区域海洋表层温度锋在一年中的逐月变化特征，表明南海北部陆架海洋表层温度锋存在明显的季节内变化。结合风场的卫星遥感资料，分析了东北季风对南海北部陆架温度锋的影响，表明东北季风风速的增加有利于温度锋强度的增强。通过对黑潮南海流套入侵较强的1999年2月与流套入侵较弱的1998年2月的SST卫星遥感资料的对比分析，考察了黑潮南海流套的入侵对南海北部陆架温度锋的影响，结果表明黑潮流套的较强入侵能够增加陆架温度锋的强度，对温度锋的走向也会产生一定的影响。  相似文献