Global variation of the seafloor cooling and the subsidence rate
Date Issued
2015
Date
2015
Author(s)
Huang, Po-Ju
Abstract
Bathymetry is linearly proportional to the square root of the seafloor age according to decades of observations. It is well explained by the essentially one-dimensional thermal contraction such as that demonstrated in the classical half-space cooling model and the subsequent 2-D modifications such as the plate model, PSM model, GDH1 model and GDH2 model, etc. However, much less efforts have been undertaken on study of variation of seafloor cooling along the ridge axis. The subsidence rates vary along ridges, suggesting that there might be heterogeneous mantle temperature along the ridge. It would require a range of 400 to -600°C for sub-ridge mantle temperature anomalies. To avoid subjective bias that might be embedded in our preliminary corridors selection described above, we propose to take advantage of the moden global data set to perform global systematic subsidence calculation. The history of East Pacific Rise (EPR) sea-floor spreading is complicated, that makes a single cooling model interpretation difficult. The Mid Atlantic Ridge (MAR) and Southeast Indian Ridge (SEIR) indicate clear along strike subsidence rate variation. The SEIR’s sea-floor spreading rate is uniform whereas lower topography and lower subsidence are likely manifestation of the passive flow field.
Subjects
mid-ocean ridge
half-space cooling model
subsidence rate
Type
thesis
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