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Aqueous alteration in primitive asteroids: High porosity ? high permeability

Bland, Philip A., Jackson, Matthew D., Coker, Robert F., Cohen, Barbara A., Webber, J. Beau W., Leese, Martin R., Duffy, Christian M., Chater, Richard J., Ardakani, Mahmoud G., McPhail, David S., and others. (2010) Aqueous alteration in primitive asteroids: High porosity ? high permeability. Earth and Planetary Science Letters, 287 (3-4). pp. 559-568. ISSN 0012-821X. (doi:10.1039/b908400b) (KAR id:25819)

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Carbonaceous chondrite meteorites are the most compositionally primitive rocks in the solar system, but the

apparently within asteroid parent bodies. Unfractionated soluble elements suggest very limited flow of liquid

and meteorite petrography. However, numerical studies persistently predict large-scale (10's km) water

to 10's km. These models have tended to use permeabilites in the range 10?13 to 10?11m2. We show that

around six orders-of-magnitude lower than previously assumed. This low permeability is largely a result of

numerical models, we predict very limited liquid water flow (distances of 100's ?m at most), even in a high

alteration, with flow over minimal lengthscales, is not a special circumstance. It is inevitable, once we

average matrix grain sizes in primitive materials of 10's–100's ?m — orders of magnitude larger than

several other features of these enigmatic rocks, most particularly, why the most chemically primitive

meteorites are also the most altered.

Item Type: Article
DOI/Identification number: 10.1039/b908400b
Uncontrolled keywords: meteorite carbonaceous chondrite asteroidal alteration permeability isochemical alteration fluid flow closed/open system
Subjects: Q Science > QC Physics > QC807 Geophysics (for Applied Geophysics see TN269)
Q Science > QB Astronomy
Q Science > QC Physics > QC176.8.N35 Nanoscience, nanotechnology
Divisions: Divisions > Division of Natural Sciences > School of Physical Sciences
Depositing User: J.B.W. Webber
Date Deposited: 26 Oct 2010 13:52 UTC
Last Modified: 16 Feb 2021 12:36 UTC
Resource URI: (The current URI for this page, for reference purposes)
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