矽卡岩矿床中的金和银     

Mein.  LD 李永明 《冶金地质动态》1990,(2):19-21

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山东崂山劈石口断裂的活动特征   总被引：4，自引：0，他引：4  

尹延鸿  薛春汀 《海洋地质与第四纪地质》1987,(1)

劈石口断裂早期属左行走滑,晚期属右行走滑且滑距约为69米,估计它的左行水平滑距可能比晚期的右行水平滑距还大.该断裂活动特征的转化可能与太平洋板块的运动方向变化有关,在40百万年前,太平洋板块的运动由北北西转向北西西.  相似文献   

海洋到大陆转换带的气体地球化学场     

AnatolyObzhirov  尹延鸿 《海洋地质前沿》1997,(2)

自1970以来，太平洋海洋研究所气体地球化学实验室已调查了海洋中的气体分布。我们对洋陆过渡带特别有兴趣，因为活动地质过程在那里发生。气体地球化学场可用于更好地了解转换带的地质活动。我们已研究了西太平洋地区不同地区的转换带的气体．包括汤加海槽一克马德克海岭、冲绳海槽一台湾岛、库拉岛等地区。气体样品取自于海水中、海洋和陆地的气孔中以及火山构造中。我们发现在不同地质条件下形成了不同气体地球比学场。l、具有少量二氧化碳和氢的碳氢化合物异常场形成于以陆应老的厚抗税物为基底的年轻火山构造接触带叩。2、具有碳氢化合…  相似文献   

北大西洋西部布莱克海岭海底似反射层断层构造     

M．M．Rowe高莉玲  尹延鸿 《海洋地质前沿》1994,(3):11-13

纳瓦尔研究实验室利用深拖声波/地球物理系统在北大西洋西部布莱克海岭获得了高分辨率多道地震资料．  相似文献   

渤海沿岸风暴沉积体的成因及分布规律   总被引：1，自引：0，他引：1  

丁东  尹延鸿 《海洋地质前沿》2000,16(7):1-3

渤海沿岸的沉积动力环境有利于形成风暴沉积体。因地理环境和沿岸入海泥沙的差异,形成不同的风暴沉积体,其分布依沉积物及风暴沉的积体的不同而呈规律性延伸。  相似文献   

Interrupting a multi-species bioinvasion vector: the efficacy of in-water cleaning for removing biofouling on obsolete vessels     

Davidson IC  McCann LD  Sytsma MD  Ruiz GM 《Marine pollution bulletin》2008,56(9):1538-1544

Vector management is the primary method for reducing and preventing nonindigenous species (NIS) invasions and their ecological and economic consequences. This study was the first to examine the efficacy of in-water scrubbing using a submersible cleaning and maintenance platform (SCAMP) to prevent invertebrate species transfers from a heavily fouled obsolete vessel. Initially, prior to treatment, 37 species were recorded in a biofouling matrix that reached 30cm depth in some locations. The bryozoan Conopeum chesapeakensis, and bivalves Mytilopsis leucophaeata and Ischadium recurvum, were dominant sessile species that created structure, supporting mobile biota that included crabs and the associated parasitic barnacle Loxothylacus panopae. Scrubbing had the effect of significantly reducing organism extent and the number of species per sample, but a substantial and diverse (30 species) residual fouling community remained across the entire vessel. Further assessments of management options are needed to prevent potentially damaging NIS transfers. Additional measures taken within an integrated vector management (IVM) strategy may further improve invasion prevention measures.  相似文献   

黄河三角洲海岸防护工程研究   总被引：2，自引：0，他引：2  

丁东  尹延鸿 《海洋地质前沿》2000,16(2):5-8

黄河三角洲海岸带的护岸工程,主要经历了３个发展阶段：１９８３年以前为初期护岸阶段,仅在局部地区护岸且基本为土堤护岸;１９８３－１９９２年,护岸工程大发展阶段,且进行了大范围石堤护岸;１９９２年以后至今,护岸工程的维护和持续发展阶段。随着护岸工程的不断修建,护岸工艺和技术有很大发展。  相似文献   

中国南部海区编图及其基本地学特征     

王忠蕾  张训华  温珍河  杨金玉  尹延鸿  邱燕  王乃东 《地球物理学进展》2014,(4)

新编中国南部海区及邻域1:100万地质地球物理系列图与"中国东部海区及邻域1:100万地质地球物理系列图"为一套系列成果,包括空间重力异常图、布格重力异常图、磁力异常图、沉积物分布图和区域构造图五种专题图件.这五种图件采用统一的地理底图,根据不同专题的技术要求,利用当代先进的编图方法和成图技术,综合已有资料、前人成果和近年实测数据编制而成.本文在充分阅读新编图件的基础上,对中国南部海区的地球物理场特征、沉积物分布规律、区域构造演化等基本地学特征进行了分析研究,加强了对南部海区地质、地球物理特征的认识.  相似文献   

Trace metal retention in mangrove ecosystems in Guanabara Bay,SE Brazil   总被引：1，自引：0，他引：1  

Machado W  Silva-Filho EV  Oliveira RR  Lacerda LD 《Marine pollution bulletin》2002,44(11):1277-1280

Along contrasting environmental conditions (e.g., degree of trace metal contamination and mangrove forest structural development), sediments of Laguncularia racemosa-dominated mangrove stands in Guanabara Bay (SE Brazil) presented a trend of trace metal accumulation in forms with low potential of remobilization and biotic uptake. Concurrently, a relatively low transfer of sediment-bound metals to L. racemosa leaves was observed, which may moderate the metal export from the forests via leaf litter transport and the metal availability to enter in food chains based on leaf consumption.  相似文献   

Persistent organochlorine residues in sediments from the Black Sea   总被引：6，自引：0，他引：6  

Fillmann G  Readman JW  Tolosa I  Bartocci J  Villeneuve JP  Cattini C  Mee LD 《Marine pollution bulletin》2002,44(2):122-133

The extent of contamination of the Black Sea by selected organochlorine compounds has been assessed through the analysis of surficial sediments taken from throughout the region. Concentrations of HCHs at sites influenced by the Danube delta are among the highest recorded on a global basis (up to 40 ng g(-1) dry wt). The ratio between the alpha- and gamma-isomers was relatively low indicating contamination through the use of lindane. Concentrations of DDTs (0.06-72 ng g(-1) dry wt) and PCBs (0.06-72 ng g(-1) dry wt) were not especially high in comparison to levels reported from throughout the world. The DDE/DDT ratio was, however, low indicating fresh inputs and hence current usage of DDT within the Black Sea region.  相似文献