Geochronology of the American-Antarctic Ridge

2006/01/01 by A. A. Schreider, Al. A. Schreider, А. А. Булычев +3 · 1 citation
Earth and Planetary Sciences · Environmental Science · #Geology and Paleoclimatology Research #Methane Hydrates and Related Phenomena #earthquake and tectonic studies #Geology #Ridge #Seafloor spreading #Geochronology #Paleontology

paper · doi:10.1134/s0001437006010139

openalex publication_date 2006/01/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/23

Abstract

A new map of chrons for the American-Antarctic Ridge area has been compiled. Its analysis and the calculations performed showed that the seafloor spreading with respect to its axis started before 85 My B.P. The spreading directions were 115° (chrons C34-C29), 145° (chrons C29-C21), 110° (chrons C21-C5C), and 85° (chrons C5C-C1). The maximum rates of about 4 cm/year were reached earlier than 52 My B.P.; subsequently, a progressive general decrease in the spreading rate has been observed. According to our forecast, the spreading may cease in the following 3.5 My.

Citations

• Chromian spinel as a petrogenetic indicator in abyssal and alpine-type peridotites and spatially associated lavas
• The American‐Antarctic Ridge
• Mesozoic and Cenozoic reconstructions of the South Atlantic
• Scotia Sea regional tectonic evolution: implications for mantle flow and palaeocirculation
• Abyssal peridotites, very slow spreading ridges and ocean ridge magmatism
• South American-Antarctic plate motion over the past 50 Myr, and the evolution of the South American-Antarctic ridge
• Motion of the Scotia Sea plates

Cited by

• South American–Antarctic Ridge [wikipedia]