从源到汇：大陆边缘的沉积作用   总被引：9，自引：1，他引：8  

李铁刚  曹奇原  李安春  秦蕴珊 《地球科学进展》2003,18(5):713-721

大陆边缘作为地球上沉积物堆积的主要区域,其沉积层保存着全球海平面变化、气候变化、岩石圈变形、大洋环流、地球化学循环、有机生产力和沉积物补给等重要信息。然而,尽管对大陆边缘沉积系统进行了几十年的研究,但仍有许多问题没有得到充分的解决,尤其是没能实现对大陆边缘沉积物扩散系统和相关地层的定量解释。为此,近年来国际地学界开始构思源到汇---大陆边缘沉积作用的系统过程研究,以提高对大陆边缘物质扩散系统行为的预测能力。介绍了源到汇---大陆边缘的沉积作用的研究对象、内容和拟解决的主要科学问题以及DSDP和ODP在大陆边缘沉积作用研究中的主要贡献和目前的进展情况。  相似文献   

Nitrogen isotope and content record of Mesozoic orogenic gold deposits surrounding the North China craton   总被引：2，自引：0，他引：2  

毛景文  张作衡  王义天  贾叶飞  Robert Kerrich 《中国科学D辑(英文版)》2003,46(3):231-245

NH4 is the most common form of nitrogen found in rocks and may substitute for K in potas-sic minerals such as biotite, muscovite, and K-feldspar[1,2]. N2 has been observed in fluid inclu-sions, and thermodynamic calculations suggest that N2 is the most c…  相似文献   

Crustal structure across the Grand Banks–Newfoundland Basin Continental Margin – I. Results from a seismic refraction profile     

K. W. Helen Lau  Keith E. Louden  Thomas Funck  Brian E. Tucholke  W. Steven Holbrook  John R. Hopper †  Hans Christian Larsen ‡ 《Geophysical Journal International》2006,167(1):127-156

  相似文献   

数字地图制图数学基础的自动建立与图廓整饰     

杨英伟  吴凡  粟卫民 《测绘信息与工程》2007,32(2):7-9

分析了建立地形图数学基础的基本原理及过程,采用Gauss-Kruger投影自动计算其数学要素,按照地形图图式规范,以模块化结构方式实现了数字地图数学基础的自动建立与图廓整饰。  相似文献   

Seismic images and magnetic signature of the Late Jurassic to Early Cretaceous Africa–Eurasia plate boundary off SW Iberia     

M. Rovere  C. R. Ranero  R. Sartori†  L. Torelli  N. Zitellini 《Geophysical Journal International》2004,158(2):554-568

  相似文献   

Three-dimensional modelling of an isolated carbonate buildup (Triassic, Dolomites, Italy)   总被引：1，自引：0，他引：1  

Wolfgang Blendinger  Peter Brack†  Arne Kristoffer Norborg‡  Erik Wulff-Pedersen§ 《Sedimentology》2004,51(2):297-314

The Middle Triassic carbonate buildups of the Dolomites show facies similarities with mud mounds but display apparent architectural elements of flat‐topped carbonate platforms. In order to test whether the facies similarities to mounds are also reflected in the internal buildup architecture, a three‐dimensional modelling study of the Middle Triassic Monte Cernera buildup has been carried out. The Cernera buildup exhibits apparent geometries suggesting a mounded platform in the lower and uppermost part of the buildup, separated by an interval with apparent platform geometry and a retrogradational platform interior, which is difficult to explain with a flat top platform model. For this purpose, a number of three‐dimensional models were constructed using the three‐dimensional modelling programme petrel ^TM. Key geological horizons were constructed based on outcrop measurements, intermediate horizons were calculated in the modelling program, and the intersections of the modelled layers with a digital topography surface were displayed and compared with outcrop photographs. The models were refined stepwise until a best fit with the actual bedding architecture was achieved. The best fit model shows that the mounded geometries in the lower and uppermost part of the buildup are real architectural elements. The intermediate platform stage, about 1·5 km across, had probably retained a mounded top with a relief of up to 50 m, which is difficult to distinguish from an absolutely flat top, but necessary to explain the retrogradational platform interior. The present study shows that Monte Cernera was dominated by mounded geometries at all stages of platform development. The mounded geometry plus facies data suggest that the platform is a deep‐water accumulation, below the zone of intense wave energy, but within the photic zone. The Cernera represents a tropical buildup type, which did not have the capacity to grow into continuously wave‐swept environments because of the small size and the absence of a wave‐resistant energy barrier. Such buildup types are probably common after major crises in earth history, when reef organisms were virtually absent.  相似文献   

Are buoyancy forces important during the formation of rifted margins?     

Mark Davis  Nick Kusznir 《Geophysical Journal International》2002,149(2):524-533

  相似文献   

Erosion and flexural uplift along transform faults   总被引：1，自引：0，他引：1  

Christophe Basile  Pascal Allemand 《Geophysical Journal International》2002,151(2):646-653

  相似文献   

Structural characteristics of the Suez rift margins     

A. R. Moustafa  A. K. El-Raey 《International Journal of Earth Sciences》1993,82(1):101-109

Field study of the Hadahid Block (the eastern margin of the central half-graben of the Suez rift) indicates two listric normal faults at its eastern and western boundaries, the rift-bounding fault and the Hadahid Fault, respectively. These faults were affected by two episodes of movement. The earlier movement (at the initial, Neogene rift opening) led to equal displacements on the two faults whereas the later movement (at the mid-Clysmic event, l7 Ma ago) caused the Hadahid Fault to bound the deep part of the central half-graben. A similar conclusion is also reached for the western margin of the southern half-graben of the rift (Esh El Mellaha and Zeit Blocks). The two listric faults bounding the margin blocks in these two oppositely tilted half-grabens (Hadahid and Esh El Mellaha Blocks) join at depth into a ramp-flat detachment. This geometry of the rift-bounding faults represents an intermediate stage in the evolution of rift basins. It is preceded by the early rifting stage where extension is less and oppositely tilted half-grabens are formed (e.g. the ancestral Red Sea-Gulf of Suez rift). Increased extension at later stages leads to the prevailance of one system of detachment instead of oppositely dipping detachments of adjacent half-grabens. The central and southern Red Sea have perhaps had this geometry before the onset of seafloor spreading.  相似文献   

朱夏教授研究大陆边缘构造演化的思路     

劳秋元 《上海国土资源》1992,(2):11-14

本文介绍了朱夏教授研究大陆边缘构造演化的思路,概括了“活动论构造历史观”在时间上、空间上、属性上的特征。朱夏教授强调地球岩石圈水平运移演化历史,提出了中生代以前古老的“潘基亚”大陆边缘和以后的年青的巨板块边缘;结合中国地质构造独特点,精辟地论述了中国大陆边缘构造的网络格架。  相似文献