Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
9522075 | Earth and Planetary Science Letters | 2005 | 18 Pages |
Abstract
Our simulations also indicate that in order for both heat and He to be in steady-state in recently formed crust, the presence of an advective dominated regime is required (k â¥Â 10â 16 m2). Under these conditions, only in total absence of contact with ASW (e.g., an atmospheric component provided by freshwater or seawater) is the total 4He / heat flux ratio expected to equal the radiogenic production ratio. Lower 4He / heat fluxes in an advective dominated regime require the incorporation of an ASW component. We argue that the observed low ocean mantle 4He / heat flux results, at least partially, from sea water incorporation within mid-ocean ridge basalts. Our simulations also suggest that 4He transport is in transient state in recently formed crust for permeabilities â¤Â 10â 17 m2. Under these conditions, low to very low mantle He excesses and thus total He / heat fluxes of up to several orders of magnitude lower than the radiogenic production ratios are expected.
Related Topics
Physical Sciences and Engineering
Earth and Planetary Sciences
Earth and Planetary Sciences (General)
Authors
Maria Clara Castro, Delphine Patriarche, Patrick Goblet,