Plate Boundaries Around the Chukchi Borderland; An Integrated Geophysics Cruise to Test Models for the Formation of the Canada Basin

楚科奇边境周围的板块边界；

• 批准号: 0909568
• 负责人: Bernard Coakley
• 金额: $ 60.7万
• 依托单位: University of Alaska Fairbanks Campus
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2009
• 资助国家: 美国
• 起止时间: 2009-09-01 至 2013-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0909568&HistoricalAwards=false
• 关键词: Plate; Boundaries; Around; Chukchi; Borderland

This award is funded under the American Recovery and Reinvestment Act of 2009 (Public Law 111-5).Coakley 0909568University of Alaska FairbanksThe Chukchi Borderland is a block of extended continental crust embedded in the oceanic crust of the Canada Basin. As the piece that does not fit the simple ?windshield wiper? model for the Mesozoic opening of this basin, it figures prominently in all tectonic models proposed for the opening of the Amerasian Basin. Funds are provided to use multi-channel seismic (MCS) reflection techniques to test these hypotheses. By imaging the sedimentary section and tracing the continuity of structure, crustal thickness and stratigraphy across the edges of this high-standing continental block, it should be possible to distinguish between strike-slip, extensional and compressional boundaries. By tying the basinal stratigraphy to well-dated sediments on the Chukchi Shelf, it will be possible to propagate seismic stratigraphic age control into the Arctic Ocean basin to date the extensional dissection of the Borderland and lay the groundwork for scientific drilling.The four edges of the Chukchi Borderland present distinct scientific opportunities as well as possibilities for broader impact. Two particular edges have been selected as offering the best pay-off, although only one may be surveyed given the limited ship days available to this project: The transition from the Chukchi Shelf to the Chukchi Borderland ? Potential fields data (eg. gravity and magnetic anomaly data) suggest a discontinuity between the North American continental crust of the Chukchi Shelf and the adjacent Chukchi Borderland crust of uncertain affinity. In addition to directly observing any structures that define the transition, collecting the proposed data would also make it possible to link the substantial historical 2-D MCS grid on the shelf and the age control there to the stratigraphy of the Arctic Ocean. This is the least challenging area for sea ice. This region should be open water during the August-September period.The northern edge of the Chukchi Borderland ? Bathymetry data appear to show extensional structures from the interior basins within the Borderland plunging below the sediment cover off the continental high. This is in conflict with some models, which require a transform fault at the northern limit of the bathymetric high.

该奖项是根据2009年《美国复苏与再投资法》（公法111-5）的资助。Coakley0909568阿拉斯加Fairbanks的University Chukchi Borderland是Chukchi Borderland，是嵌入了加拿大盆地海洋壳中的扩展大陆壳的块。作为不适合简单的雨水刮水器的作品？该盆地中生代开放的模型，它在为开放的Amerasian盆地开放的所有构造模型中都显着地数字。提供了使用多通道地震（MCS）反射技术来检验这些假设的资金。通过对沉积物截面进行成像，并追踪结构的连续性，地壳厚度和地层横跨该高层大陆块的边缘，应该可以区分滑滑，扩展和压缩边界。通过将盆地地层与楚科奇架上的良好的沉积物联系起来，可以将地震地层年龄控制传播到北极海洋盆地，以鉴于边境地区的扩展解剖，并为科学钻探提供基础。已经选择了两个特定的边缘作为提供最佳的回报，尽管鉴于该项目可用的船舶天数有限：从Chukchi货架过渡到Chukchi Borderland？潜在的磁场数据（例如重力和磁异常数据）表明，Chukchi架子的北美大陆壳与不确定亲和力的相邻Chukchi Borderland Crust之间存在不连续性。除了直接观察定义过渡的任何结构外，收集提出的数据还可以将架子上的大量历史2-D MCS网格和年龄控制与北极海洋的地层联系起来。这是海冰挑战最小的领域。该地区应该在8月至9月的时期开放水。测深数据似乎显示出来自大陆高的沉积物覆盖物下方的边境盆地内部盆地的伸展结构。这与某些模型相抵触，这些模型需要在测深到的北部极限处发生变换故障。