Seismic multichannel reflection profiles from the Gulf of Cadiz, IODP Expedition 339

Sediments cored along the southwestern Iberian margin during Integrated Ocean Drilling Program Expedition 339 provide constraints on Mediterranean Outflow Water (MOW) circulation patterns from the Pliocene epoch to the present day. After the Strait of Gibraltar opened (5.33 million years ago), a limited volume of MOW entered the Atlantic. Depositional hiatuses indicate erosion by bottom currents related to higher volumes of MOW circulating into the North Atlantic, beginning in the late Pliocene. The hiatuses coincide with regional tectonic events and changes in global thermohaline circulation (THC). This suggests that MOW influenced Atlantic Meridional Overturning Circulation (AMOC), THC, and climatic shifts by contributing a component of warm, saline water to northern latitudes while in turn being influenced by plate tectonics.

Die Lagebestimmungen des südlichen Magnetpols 1820-1963

Der Weg des südlichen Magnetpols ist von 1820 bis 1959 (fast 140 Jahre) dargestellt. Diese Wanderungen, die teilweise bereits in "Polarforschung" 1945, 35 dargestellt wurden, entsprechen dem Sinne nach den Verschiebungen des nördlichen Magnetpols, die eingehend in "Polarforschung" 1947, 133/39 behandelt wurden. Sie entstammen freundlicher brieflicher Mitteilung von H.P. Kosack und anderen Quellen; K. weist besonders darauf hin, daß man besser von einem Gebiet des magnetischen Pols von etwa 50 x 50 km spreche.

(Table 1) Compressional wave velocities for rocks from DSDP Hole 31-293 in the Philippine Sea

Compressional wave velocities measured in gabbroic rocks and metabasites recovered from Site 293 of Leg 31 in the Philippine Sea (on the Central Basin Fault) are correlative with seismic velocities determined for Layer 3. The lower crustal origin for these rocks suggested by this data is further supported by the similarity between these samples, dredge haul samples from fracture zones in the main ocean basins and rocks found in ophiolite complexes. These plutonic rocks were possibly introduced to the sea floor by movements along the Central Basin Fault, a major tectonic feature in the Philippine Sea, or formed as part of new ocean crust within a leaky transform fault.