Hydrothermal Convection and Aqueous Alteration in Carbonaceous Chondrite Parent Bodies

Details Hydrothermal Convection and Aqueous Alteration in Carbonaceous Chondrite Parent Bodies Hydrothermal Convection and Aqueous Alteration in Carbonaceous Chondrite Parent Bodies

Sep 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006dps....38.1303p&link_type=abstract

American Astronomical Society, DPS meeting #38, #13.03; Bulletin of the American Astronomical Society, Vol. 38, p.505

Physics

Geophysics

Scientific paper

Carbonaceous chondrites (CCs) are derived from undifferentiated icy planetesimals and are the most primitive meteorites. The information that we can derive from CCs depends largely on our understanding the effects of water in carbonaceous chondrite parent bodies (CCPBs). The way water influenced the parent bodies’ evolution depends partly on the flow rates and patterns of the water circulation. The first quantitative models for the thermal evolution of CCPBs were based on parameterized hydrothermal convection and homogeneous alteration. Recent work has presented full models of hydrothermal convection in an internally heated, self-gravitating porous sphere. These results illustrate that the convective patterns in CCPBs are not uniform. Some regions of the body experience little to no pore water flow while other regions experience hundreds of pore volumes. It has long been held that CC meteorites of different chemical groups come from distinct parent bodies. Simulations showing heterogeneous patterns of fluid flow in CCPBs have led to the suggestion that parent bodies could be heterogeneously altered and, consequently, one parent body could be a source for multiple groups of CC meteorites. Previously, no numerical convection simulations of CCPBs have included water-rock reactions. We have coupled the computer code MAGHNUM with the reaction package PHREEQC. We use MAGHNUM to simulate the dynamic freezing, thawing and flow of water in a radiogenically-heated, self-gravitating body. The accompanying water-rock interactions are modeled with PHREEQC. Flow and chemistry are coupled through, for example, reaction rates and temperature. This work was supported by a grant from the Institute of Geophysics and Planetary Physics at Los Alamos National Laboratory.

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