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

深榴辉岩地壳和MohoScott Smithson的地震研究怀俄明大学摘要这是一个地震数据采集计划的探索性研究建议的小额赠款，由于海洋研究船的时间表发生变化，该计划突然成为可能。 SGER提案似乎是我们在时间范围内应对这一机会的唯一方式。 典型的榴辉岩产地之一是挪威西部的卑尔根弧，榴辉岩化与麻粒岩中沿着剪切带的流体流动有关。 榴辉岩地形下的大陆地壳的性质是什么，榴辉岩从哪里来，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“目标的机会”，进行详细的海洋-陆地地震反射/折射剖面在这个榴辉岩的地方在挪威的卑尔根弧。 在过去两年中，我们一直在与卑尔根大学的Rolf Mjelde教授合作开发这一项目，他利用的是他对该地区的了解以及对卑尔根大学研究船进行地震剖面测量的使用。 典型的海洋研究船，这一个有一个完整的时间表，提前几年计划，所以2004年似乎是第一年工作，我们的项目进入时间表。 现在，在启用一艘新的研究船之际，我们刚刚得知，我们在2003年5月有7天的时间用于这个榴辉岩项目。 我们提出了一个计划，结合海洋-陆地记录射击海洋气枪到15-20 OBS和15 Refteks与3-组件传感器，人员从怀俄明州的大学将在陆地上建立，产生一个非常详细的，完整的数据集与密切的轨迹间距。 这种类型的记录的显著特点是在长距离上的近道间距和壮观的S波从P波转换在海底。 这些清晰的S波起始提供了Vp/Vs和S波分裂的额外约束。 结合Vp、Vs、Vp/Vs和成像主要断层、莫霍面和较大榴辉岩体，应提供榴辉岩在地壳深部的分布、榴辉岩逆冲席的物源、莫霍面的性质和可能的流体通道等新的重要地震约束

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