Scheduled Cruises in 2000

Summary of a recent cruise on margins research (CA.001)

Location :   N. Atlantic, Newfoundland non-volcanic rifted margin

Research ship :   R/V Maurice Ewing

Cruise Identifier :   EW0007

Sails :   mid-July 2000 from St. Johns, Newfoundland, Canada

Docks :   late August 2000 in Newark, NJ, USA

Research ship :   R/V Oceanus

Sails :   mid-July 2000 from St. Johns, Newfoundland, Canada

Docks :   late August 2000 in St. Johns, Newfoundland, Canada

Laboratory :   Woods Hole (WHOI), USA

PI :   Brian E. Tucholke, Woods Hole, USA
       W. Steven Holbrook, University of Wyoming, USA
       Keith Louden, Dalhousie University, CAN
       John Hopper, GEOMAR, GER
       Hans Christian Larsen, Danish Lithosphere Centre, DEN
       Sharon Deemer, Memorial University of Newfoundland, CAN
       Charles Hurich, Memorial University of Newfoundland, CAN
       Jeremy Hall, Memorial University of Newfoundland, CAN

E-mail contact :   btucholke@whoi.edu

Scientific objectives :   The purpose of the SCREECH (Studies of Continental Rifting and Extension on the Eastern Canadian SHelf) program was to 1) distinguish between competing hypotheses for the origin of crust between unambiguous oceanic and continental crust on the Newfoundland margin, 2) to compare the crustal structure of the Newfoundland margin to the conjugate Iberian margin in order to learn more about the processes that extend and ultimately rupture continental crust, and 3) to obtain site survey data that could be used to select and justify ODP drill sites in the Newfoundland Basin. To accomplish these objectives, coincident multi-channel seismic (MCS) reflection data, wide-angle seismic reflection/refraction data, gravity data and magnetic data were collected along three primary transects across the Newfoundland margin. Each transect reached from unambiguous continental crust seaward past a magnetic anomaly identified as M0, and thus onto presumed oceanic crust.