Asymmetric sea-floor spreading caused by ridge-plume interactions

Article Abstract:

Self-consistent digital isochrons were used to analyze the asymmetry of crustal accretion during the past 83 Myr. Crustal accretion deficits happen mostly on ridge flanks overlaying hotspots. A grid of crustal accretion rates were constructed using the global age data set, and it is proposed that asymmetric accretion is due to ridge propagation towards mantle plumes.This is a complementary approach to geochemical and other geophysical data approaches.

United States, Research, Observations, Icing (Meteorology), Ice accretion, Geophysical research

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Cenozoic motion between East and West Antartica

Article Abstract:

East-West Antarctic motion was constrained using the corridor of the southeast Indian ridge, east of the Balleny fracture zone. Magnetic data, gravity data nd swath bathymetry was collected to enable the calculation of mid-Cenozoic rotation parameters for East and West Antarctica. It was revealed that there was around 180 km of separation in the western Ross Sea embayment in Eocene and Oligocene time.

Environmental aspects, Geology, Stratigraphic, Stratigraphy, Antarctic regions, Cenozoic Era

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Geomagnetic intensity variations over the past 780 kyr obtained from near-seafloor magnetic anomalies

Article Abstract:

The geomagnetic abnormalities of the southern East Pacific Rise, near-seafloor level, are discussed. Variations up to 780 kyr ago in the geomagnetic intensity are assessed.

Pacific Ocean, Magnetic anomalies

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