How do the compositions of mid-ocean ridge basalts (MORB) vary globally and what do these variations tell us about the mantle source?

Mar 21, 2023 ... Seafloor spreading is a geological process by which new oceanic crust forms at mid-ocean ridges through volcanic activities and then slowly moves away from the ... Sep 11, 2024 ... Seafloor spreading happens when volcanic eruptions at mid-ocean ridges cause the oceanic crust to crack. New lava fills these cracks, pushing the crust apart ... Dec 15, 2000 ... Seafloor spreading started along the NW margin in the Late Jurassic. By extrapolating the age of the boundary between the continental and ... Dec 10, 2020 ... ... Sea spreading center (ASSC). The structure of the ASSC is analogous to a slow-spreading mid-ocean ridge (MOR), with symmetric, evenly spaced ... 2 cm * 475 km/cm = 950 km = 95,000,000 cm = 9.5 * 107 cm · 65 million years = 65,000,000 years = 6.5 * 107 years. Natawidjaja [2000], spreading rate in the Andaman Sea is from Kamesh Raju et ... Changes in direction of seafloor spreading revisited, J. Geophys. Res ... The stages of rifting, spreading and the cessation, of activity the South China Sea basin in Cenozoic appears to be coeval with the progressive closure of the ... Mar 24, 2025 ... seafloor spreading ... seafloor spreading, theory that oceanic crust forms along submarine mountain zones, known collectively as the mid-ocean ... Seafloor spreading occurs at divergent plate boundaries. As tectonic plates slowly move away from each other, heat from the mantle's convection currents makes ... Jan 17, 2014 ... The SW South China Sea preserves a propagating oceanic spreading centre and associated continent–ocean transition (COT) that characterizes ...