Processed multichannel seismic data, including the eastern part of SCREECH Transact 3, acquired during the R/V Maurice Ewing survey EW0007 2000)

This data set consists of the eastern part of SCREECH Transect 3 (3MCS2) and line 306. 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 OCE98-19599 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.

本数据集包含SCREECH第3测线（3MCS2）东段及306测线。这项针对纽芬兰陆缘的大洋钻探计划（Ocean Drilling Program, ODP）场地调查是一项联合研究项目——SCREECH（全称为加拿大陆架东部大陆裂谷与伸展研究，Studies of Continental Rifting and Extension on the Eastern Canadian SHelf），参与单位包括怀俄明大学、伍兹霍尔海洋研究所（Woods Hole Oceanographic Institution, WHOI）、达尔豪西大学以及丹麦岩石圈中心的科研团队。埃文号（Ewing）科考船采集了多道地震（Multi-Channel Seismic, MCS）、磁法、重力及多波束测深数据；海洋号（Oceanus）科考船则通过海底地震仪/水听器（Ocean-bottom Seismometers/Hydrophones, OBS/Hs）采集了广角反射/折射数据。本次科考旨在构建关键数据集，用于验证非火山型裂谷环境下的大陆裂谷、大陆裂解及海底扩张起始相关模型。其科考目标如下：1）明确该区域洋陆过渡地壳的性质特征；2）与伊比利亚陆缘开展对比研究，以此验证裂谷作用过程中纯剪切与简单剪切模型；3）定量分析裂谷作用期间侵入与喷出的火成岩物质总量，为东格陵兰陆缘等其他火山型裂谷陆缘提供对比数据集。本项目的资助方包括美国国家科学基金会（National Science Foundation, NSF，资助编号OCE98-19599与OCE98-19053）、达尔豪西大学、丹麦与格陵兰地质调查局、丹麦国家研究基金会（Danmarks Grundforskningsfond）以及加拿大自然科学与工程研究理事会。