SGER: Seismic Study of Deep Eclogitic-Granulitic Crust and Moho

怀俄明州大学斯科特·史密森大学深部榴辉岩壳的地震研究这是一笔小额赠款，用于探索性研究提议一项地震数据采集计划，由于一艘海洋考察船的时间表改变，该计划突然成为可能。SGER的提议似乎是我们能够在其时间框架内对这一机会做出反应的唯一途径。挪威西部卑尔根弧是典型的榴辉岩产区之一，榴辉岩化作用与麻粒岩中沿剪切带的流体流动有关。榴辉岩地形下的陆壳性质是什么，榴辉岩来自哪里，它们是如何到达那里的？这些都是我们建议澄清的问题。我们有一个令人兴奋的“机会目标”，在挪威卑尔根弧的这个榴辉岩地区进行详细的海陆地震反射/折射剖面图。过去两年来，我们一直在与卑尔根大学的罗尔夫·米耶尔德教授合作，根据他对该地区的了解和使用卑尔根大学的地震剖面研究船，开发这一项目。作为典型的海洋科考船，这艘船有一个满满的时间表，提前几年就计划好了，所以2004年似乎是我们将项目工作纳入时间表的第一年。现在，在启动一艘新的科考船之际，我们刚刚了解到，我们在2003年5月为这个榴辉岩项目提供了7天的船期。我们提出了一种海上-陆地联合记录计划，向15-20个OBS和15个Reftek发射海军气枪，怀俄明大学的人员将在陆地上建立三分量传感器，生成非常详细、完整的数据集，跟踪间隔很近。这种记录的显著特点是长距离近道距和海底P波转换产生的壮观的S波。这些清晰的S波起点为VP/V和S波分裂提供了额外的限制。结合Vp、Vs、Vp/Vs和成像主要断层、莫霍面和较大榴辉岩体，应该为榴辉岩在地壳深部的分布、榴辉冲断层的来源、莫霍面的性质以及可能的流体通道提供新的、重要的地震约束。

Seismic Study of Deep Eclogitic Crust and MohoScott SmithsonUniversity of WyomingAbstractThis is a Small Grant for Exploratory Research proposal for a seismic data acquisition program that has suddenly become possible because of a change in schedule of a marine research vessel. The SGER proposal appears to be the only way that we can respond to this opportunity in its time frame. One of the classic eclogite localities is in the Bergen Arcs of western Norway where eclogitization is related to fluid flow along shear zones in granulites. What is the nature of continental crust beneath an eclogite terrain, where did the eclogites come from, and how did they get there? These are the problems that we proposal to clarify. We have an exciting "target-of-opportunity" to conduct detailed marine-land seismic reflection/refraction profiling over this eclogite locality in the Bergen Arcs of Norway. We have been developing this project over the last two years in cooperation with Professor Rolf Mjelde of the University of Bergen, based on his knowledge of the area and use of the University of Bergen research vessel for the seismic profiling. Typical of marine research vessels, this one has a full schedule, planned years in advance, so that 2004 seemed to be the first year to work our project into the schedule. Now on occasion of activating a new research vessel, we have just learned that we have 7 days of ship time for this eclogite project in May of 2003. We propose a program of combined marine-land recording firing marine airguns into 15-20 OBS's and 15 Refteks with 3-component sensors that personnel from the University of Wyoming will set up on land, generating a highly detailed, complete data set with close trace spacing. The striking characteristics of this type of recording are close trace spacing over long distances and spectacular S-waves from P-wave conversion at the ocean bottom. These clear S-wave onsets provide additional constraints in Vp/Vs and S-wave splitting. Combination of Vp, Vs, Vp/Vs and imaging major faults, Moho, and larger eclogite bodies should provide new, important seismic constraints on the distribution of eclogite in the deep crust, provenance of the eclogitic thrust sheet, nature of the Moho, and possibly fluid pathways