Collaborative Research: ACCRETE: An Integrated Study of Continental Growth at a Convergent-to-Transpressive Plate Margin

小行星9219002 该项目包括一个试验性地震剖面，旨在增进对阿拉斯加东南部和不列颠哥伦比亚省沿海造山带内与海底加积有关的大陆生长过程的了解。 地震数据将为厚皮逆冲推覆作用、变质作用和岩浆作用在大陆岩石圈形成中的作用的模型提供制约因素。 他们还将限制模型如何俯冲和平移期间的相对板块运动从正面（白垩纪中期）到横向（始新世）的重大转变，以及这种重排如何影响地壳的发展。 抗震分析结果将指导设计人员对这些问题的后续研究建议。 地震剖面将使用一艘海洋研究船上部署的声源阵列，该海洋研究船沿沿着130公里长的峡湾穿越海岸造山带，并沿海岸沿着放置密集间隔（3-5公里）的三分量地震记录仪，以记录0至200公里的偏移。 该船还将部署一个4公里长的水听器拖缆，用于同时进行MCS（多道地震）剖面测量。 这一独特的实验将经过验证的海洋地震技术与地震记录仪的新能力相结合，以确定一个已知大陆增生地区的中下地壳结构和物理特性。 ***

9219002 Diebold This project involves a pilot seismic profile designed to improve understanding of processes of continental growth associated with terrane accretion in the Coast orogen of southeast Alaska and British Columbia. The seismic data will provide constraints pertaining to models for the role of thick-skinned thrusting, metamorphism and magmatism in the formation of continental lithosphere. They will also constrain models on how subduction and translation were accommodated during a major shift in relative plate motions from head-on (mid Cretaceous) to transcurrent (Eocene), and how this rearrangement affected crustal development. The seismic results will guide design of subsequent research proposals on these problems. The seismic profiling will use an acoustic source array deployed from a marine research ship that crosses the Coast orogen along a 130 km long fjord, and densely spaced (3-5 km) 3-component seismic recorders placed along the shore to record offsets from 0 to 200 km. The ship will also deploy a 4 km long hydrophone streamer for simultaneous MCS (multi-channel seismic) profiling. This unique experiment combines proven marine seismic techniques with the new capability of the seismic recorders to determine mid to lower crustal structure and physical properties of an area of known continental accretion. ***