Abstract
Measured heat flow in young oceanic crust is generally less than predicted
by lithospheric cooling models, even where thick sediments had been
expected to isolate: the crust from the ocean and hence eliminate
hydrothermal heat transfer. At isolated sites with basement outcrops
or topographic highs, however, heat flow sometimes exceeds the model
predictions. It thus appears that water migrates and upwells at distant
sites, hence transferring heat laterally. Simple estimates of the
lateral flow distance can be made when heat flow data have adequate
areal sampling. The data can be parametrized by distance from the
presumed upwelling site, and integrated to estimate the area from
which heat must be transferred. Along the Juan de Fuca ridge, the
minimum effective lateral flow distances are 8 km for 3-5 Ma crust,
and 2 km for younger (< 1 Ma) crust.
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