Processed multichannel seismic data, including SCREECH Transact 2, crossing the Newfoundland margin, acquired during the R/V Maurice Ewing survey EW0007 2000)

This data set consists of SCREECH Transect 2 (2MCS) and lines 105 through 109, 201 through 209, and 301 through 304. This ODP site survey on the Newfoundland margin was a joint project, SCREECH (Studies of Continental Rifting and Extension on the Eastern Canadian SHelf), between the University of Wyoming, WHOI, Dalhousie University, and Danish Lithosphere Centre scientists. The Ewing acquired MCS, magnetic, gravity, and multibeam bathymetric data while the Oceanus acquired wide-angle reflection/refraction data via ocean-bottom seismometers/hydrophones (OBS/Hs). This cruise was to provide a critical dataset for testing models of continental rifting, breakup, and initiation of seafloor spreading in a non-volcanic rifted environment. Its objectives were to: 1) characterize the nature of the crust transitional between oceanic and continental crust in the region; 2) provide a comparison with the Iberian margin, thereby allowing testing of models of pure-shear vs. simple-shear during rifting; and 3) determine the amount of igneous material intruded and extruded during rifting, providing comparative data with other volcanic rifted margins, such as the East Greenland margin. Funding was provided by NSF (grants OCD98-19599 and OCE98-19053), Dalhousie University, Geological Survey of Denmark and Greenland, Danish National Research Foundation (Danmarks Grundforskningsfond), and the Natural Sciences and Engineering Council of Canada.

这个数据集包含SCREECH Transect 2（2MCS）以及105至109线、201至209线、301至304线。该纽芬兰边缘的大洋钻探计划（ODP）站点调查是SCREECH（加拿大东部大陆架大陆裂谷与伸展研究，Studies of Continental Rifting and Extension on the Eastern Canadian SHelf）项目的一部分，由怀俄明大学、伍兹霍尔海洋研究所（WHOI）、达尔豪斯大学及丹麦岩石圈中心的科学家联合开展。Ewing号采集了多道地震（MCS）、磁学、重力及多波束测深数据，而Oceanus号则通过海底地震仪/水听器（OBS/Hs）采集了广角反射/折射数据。本次航行旨在为非火山型裂谷环境下的大陆裂谷、破裂及海底扩张起始模型验证提供关键数据集。其研究目标包括：1）表征该区域洋壳与陆壳之间过渡地壳的性质；2）与伊比利亚边缘进行对比，以验证裂谷过程中纯剪切与简单剪切模型；3）确定裂谷期间侵入与喷出的火成物质总量，为与东格陵兰边缘等火山型裂谷边缘的对比提供数据支持。该项目由美国国家科学基金会（NSF，资助号OCD98-19599及OCE98-19053）、达尔豪斯大学、丹麦和格陵兰地质调查局、丹麦国家研究基金会及加拿大自然科学与工程研究理事会共同资助。