期刊
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
卷 115, 期 -, 页码 -出版社
AMER GEOPHYSICAL UNION
DOI: 10.1029/2008JB005994
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资金
- St. Catharine's College
Seafloor topography is a key observational constraint upon the evolution of the oceanic lithosphere. Specifically, plots of oceanic depth (z) versus crustal age (t) for normal seafloor are well explained by depth-age predictions of thermal contraction models such as the half-space and cooling plate model. Old seafloor (t > similar to 70 Ma) shallower than that predicted by half-space cooling (i.e., z proportional to root t), or flattening, is a key but debated discriminator between the two models. Korenaga and Korenaga (2008) in a recent paper find normal seafloor depths of all ages to be consistent with a z proportional to root t model, thus supporting a cooling half-space model for all ages of seafloor. Upon reevaluation, however, the mean depths of their normal seafloor flatten at ages >70 Ma, e.g., by 723.2 +/- 0.5 m (1 standard error) for t > 110 Ma. This observed inconsistency with the z proportional to root t model is statistically significant (>99.9%)and remains robust (>94%) even if the number of effective independent depth observations is argued to be low (e.g., n = 10). So, if any statistically significant conclusion can be drawn from the observed depths of rare old normal seafloor, it is that old seafloor flattens, which is incompatible with the cooling half-space model applying to all ages of seafloor but does not preclude a cooling-plate style approximation to lithospheric evolution.
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