Triassic Nb-enriched basalts, magnesian andesites, and adakites of the Qiangtang terrane (Central Tibet): evidence for metasomatism by slab-derived melts in the mantle wedge   总被引：10，自引：0，他引：10  

Qiang Wang  Derek A. Wyman  Jifeng Xu  Yusheng Wan  Chaofeng Li  Feng Zi  Ziqi Jiang  Huaning Qiu  Zhuyin Chu  Zhenhua Zhao  Yanhui Dong 《Contributions to Mineralogy and Petrology》2008,155(4):473-490

New chronological, geochemical, and isotopic data are reported for Triassic (219–236 Ma) adakite-magnesian andesite-Nb-enriched basaltic rock associations from the Tuotuohe area, central Qiangtang terrane. The adakites and magnesian andesites are characterized by high Sr/Y (25–45), La/Yb (14–42) and Na₂O/K₂O (12–49) ratios, high Al₂O₃ (15.34–18.28 wt%) and moderate to high Sr concentrations (220–498 ppm) and ε_ND (t) (+0.86 to +1.21) values. Low enrichments of Th, Rb relative to Nb, and subequal normalized Nb and La contents, and enrichments of light rare earth elements combine to distinguish a group of Nb-enriched basaltic rocks (NEBs). They have positive ε_ND (t) (+2.57 to +5.16) values. Positive correlations between Th, La and Nb and an absence of negative Nb anomalies on mantle normalized plots indicate the NEBs are products of a mantle source metasomatized by a slab melt rather than by hydrous fluids. A continuous compositional variation between adakites and magnesian andesites confirms slab melt interaction with mantle peridotite. The spatial association of the NEBs with adakites and magnesian andesites define an “adakitic metasomatic volcanic series” recognized in many demonstrably subduction-related environments (e.g., Mindanao arc, Philippines; Kamchatka arc, Russia; and southern Baja California arc, Mexico). The age of the Touhuohe suite, and its correlation with Triassic NEB to the north indicates that volcanism derived from subduction-modified mantle was abundant prior to 220 Ma in the central Qiangtang terrane.  相似文献   

Structural elements of the Makran region, Oman sea and their potential relevance to tsunamigenisis     

Mohammad Mokhtari  Iraj Abdollahie Fard  Khaled Hessami 《Natural Hazards》2008,47(2):185-199

The character of convergence along the Arabian–Iranian plate boundary changes radically eastward from the Zagros ranges to the Makran region. This appears to be due to collision of continental crust in the west, in contrast to subduction of oceanic crust in the east. The Makran subduction zone with a length of about 900 km display progressively older and highly deformed sedimentary units northward from the coast, together with an increase in elevation of the ranges. North of the Makran ranges are large subsiding basins, flanked to the north by active volcanoes. Based on 2D seismic reflection data obtained in this study, the main structural provinces and elements in the Gulf of Oman include: (i) the structural elements on the northeastern part of the Arabian Plate and, (ii) the Offshore Makran Accretionary Complex. Based on detailed analysis of these data on the northeastern part of the Arabian Plate five structural provinces and elements—the Musendam High, the Musendam Peneplain, the Musendam Slope, the Dibba Zone, and the Abyssal Plain have been identified. Further, the Offshore Makran Accretionary Complex shown is to consist Accretionary Prism and the For-Arc Basin, while the Accretionary Prism has been subdivided into the Accretionary Wedge and the Accreted/Colored Mélange. Lastly, it is important to note that the Makran subduction zone lacks the trench. The identification of these structural elements should help in better understanding the seismicity of the Makran region in general and the subduction zone in particular. The 1945 magnitude 8.1 tsunamigenic earthquake of the Makran and some other historical events are illustrative of the coastal region’s vulnerability to future tsunami in the area, and such data should be of value to the developing Indian Ocean Tsunami Warning System.  相似文献   

塔里木盆地西部吐木休克断裂带的主要特征和构造演化   总被引：8，自引：5，他引：3       下载免费PDF全文

朱德丰  刘和甫  吴根耀 《地质科学》2008,43(2):209-227

塔里木盆地西部的吐木休克断裂带是中央隆起(前身是晋宁期碰撞造山带)的次级单元巴楚断隆与北部坳陷的次级单元阿瓦提凹陷之间的分界。本文以大量的地质和地球物理证据,证明它是一条内部结构复杂且切穿地壳的深断裂。结合区域构造演化恢复了断裂发育史,指出它经历过三期重大的冲断活动,分别发生在加里东期、海西期和新近纪。新近纪的冲断与巴楚断隆的南界断裂带有相同的构造样式,可分为两幕:中新世的冲断受制于南天山前陆冲断带的向南扩展,更新世的冲断主要受制于西昆仑前陆冲断带的向北扩展。吐木休克断裂带的东西走向段和北西走向段的构造特征尚有若干差异,前者在加里东期活动较强,反映了构造的继承性;北西走向段则是加里东期出现的新生构造,在海西期进一步发展,更新世时因被卷入西昆仑的前陆冲断作用,表现出强烈而复杂的变形。  相似文献   

塔里木西部地区古生代断裂活动的方式和机制   总被引：15，自引：2，他引：13       下载免费PDF全文

李曰俊  吴根耀  孟庆龙  师骏  冯晓军  郑民 《地质科学》2008,43(4):727-745

基于系统的地震剖面解释及其与塔中地区的对比,本文探讨了塔里木西部地区古生代断裂活动的方式和机制。玛东断裂带是一条宽阔的北东向盖层滑脱型褶皱冲断带,前展式向东南扩展,冲断作用发生在奥陶纪末。巴东断裂(吐土休克Ⅱ号断裂)为北西向基底卷入型冲断带,奥陶纪末和中二叠世末发生冲断。巴西断裂和塔参2井南断裂是海西期的正断层。塔里木古板块古生代的发育受邻侧的造山带演化制约,近东西向和北东向断裂奥陶纪末的冲断是继承基底构造发育的。塔中地区的近北西向断裂是晚寒武世的新生断裂,加里东运动可分为两幕:奥陶纪末的冲断(艾比湖运动)和晚志留-中泥盆世的冲断-走滑,后者向西明显减弱。塔里木西部的部分北西向断裂(如康西断裂)可归入塔中北西向断裂系。北东向的玛东断裂带是其西的向北(东)冲断的吐木休克断裂带与其东的向南偏东冲断的塔中8-1井——塔中5井断裂带之间的调节断层。  相似文献   

郯庐断裂带张八岭隆起南段花岗岩LA-ICP MS锆石U-Pb年龄及其构造意义   总被引：10，自引：8，他引：2  

牛漫兰  朱光  谢成龙  柳小明  曹洋  谢文雅 《岩石学报》2008,24(8)

本文利用LA-ICP MS方法,对零星分布于郯庐断裂带张八岭隆起南段肥东-巢湖地区的一些花岗岩体进行了锆石U-Pb同位素年代学研究.结果表明,西徐村北岩体、尖山岩体、西花村岩体、永丰岩体和锦张村岩体的形成年龄分别为126.9 ±1.0Ma、114.8±1.3Ma、108.1 ±1.6Ma、103.0 ±0.9Ma和120.3 ±0.7Ma,这些花岗岩体均形成于早白垩世,但侵位时间有一定差异.与郯庐断裂带西侧的鲁西、徐淮、蚌埠地区同时代克拉通内部侵入岩相比,断裂带内岩浆活动持续的时间更长(～27Ma).这一结果不但指示郯庐断裂带上的岩浆活动是不均一的,各地岩浆在活动的强烈程度和时间特征上均有很大的差异,而且显示了断裂带内比克拉通内部岩浆活动结束时间较晚,暗示其下岩石圈可能有更为强烈的减薄程度和更长的减薄历史.  相似文献   

辽宁省海洋环境保护与海岸带可持续开发利用     

刘现明 《海岸工程》1995,14(4):33-36

在分析综合辽宁省海岸带调查和沿海经济贝类污染监测资料基础上，根据辽宁海岸带水质，沉积物和生物污染现状及发展趋势。针对所存在的问题，讨论了辽宁省海洋污染特别是赤潮对海洋资源的破坏，并在组织机构，地方立法，海岸带环境保护规划，污染源控制与整体环境改进，监测方案等方面提出了建设海上辽宁、加强辽宁省海洋环境保护与海岸可持续开发利用的建议。  相似文献   

福建海岛潮间带软体动物群落分布特征   总被引：1，自引：0，他引：1  

周时强  黄凌风  郭丰  郑怀平 《海洋科学》2001,25(8):5-8

福建海岛潮间带软体动物共鉴定248种，隶属于5纲78科161属，应用群落系数，等级聚类分析和极坐标排序研究软体动物落分布，结果表明，软体动物群落可分为3种类型，即河口型群落，近岸港湾群落和开阔海域群落，群落分布与海岛所处地理位置及其生境类型密切相关，盐度和水动力是重要的影响因子。  相似文献   

象山港,三门湾潮间带生态学研究：Ⅱ.数量组成与分布     

邵晓明  范明生 《海洋学研究》1996,14(4):35-41

象山港、三门湾软相潮间带底栖动物数量的水平分布与港湾的屏蔽性程度有一定的关系，生物量是三门湾（１８０．９５ｇ／ｍ２）高于象山港（９４．４７ｇ／ｍ２），生物密度是象山港（８１６个／ｍ２）高于三门湾（３４７个／ｍ２）。决定所面生物数量变化的主要底栖动物种类数随着港湾屏蔽性程度的提高而相应地减少。生物数量的垂直分布主要受潮汐作用的影响，以中潮区为最高。生物量以６月份最大，密度是４月份最大。  相似文献   

Wave Decay and Its Characteristics in Surf Zone     

Gu Jialong Shen Xianrong Professor  Hohai University  Nanjing Engineer  The Investigation  Design Institute  Bureau of Communications of Zhejiang Province  Hangzhou 《中国海洋工程》1991,(2)

In accordance with the similarity between breaking waves and hydraulic jumps, the expressions for estimating wave decay and wave energy dissipation in the surf zone are derived based on the fundamental equations of fluid mechanics. Using the numerical solution of cnoidal wave theory, the various kinematic properties of waves in the surf zone, including the relative wave crest height, wave energy, and radiation stress are discussed. The values calculated with the method proposed in this paper are in good agreement with the experimental data gained by other researchers. The present expressions can be used in the studies of sediment transport on gently sloping beaches, especially on muddy beaches.  相似文献   

舟山潮间带生态学研究：Ⅱ.数量及其分布   总被引：3，自引：0，他引：3  

蔡如星  郑锋 《海洋学研究》1991,9(3):58-72

舟山潮间带生物种类数量的平面分布与盐度和海岸开敞性有关,垂直分布与潮汐有关;群落数量的水平分布与底质和海岸开敞性有关,垂直分布与潮汐有关。舟山潮间带生物有明显的分带现象,隐蔽的岩岸区分为:滨螺带和藤壶-牡蛎带两个带;开敞性岩岸区分为:滨螺带,藤壶-(虫戚)-藻类带及藻类带3个带。沙滩区分为:沙蟹带和浅蛤-斧蛤带两个带;泥沙滩区分为:盐碱植物-滨螺带和招潮蟹-大眼蟹带;泥滩区分为:蟹守螺-囊螺带和蟹守螺-织纹螺带。  相似文献