THE CHEMISTRY OF MARSHeather Tennant

Earth 438

Presented March 11, 2014

Motivation

• Bulk Chemical Composition• Formation and evolution of the planet• Initial concentrations of surface components

• Surface Chemistry• Geologic processes throughout history

• Aqueous Alteration

• Differentiation• Geochemical cycling• Biological implications

Bulk Composition

• Methods of estimation:• Geochemical/cosmochemical models

• Meteorites, chondrites

• Isotopic• Meteorites, chondrites

• Geophysical• Bulk density, moment of inertia, Love number, radius• Need for seismic data and heat flow data

Bulk Composition

Surface Chemistry

• Methods of measurement:• Orbital/Remote Sensing

• Reflectance spectroscopy• Gamma Ray Spectroscopy• Neutron Spectroscopy

• In situ measurements• Spectroscopy• Imaging

• Meteorites

Geochemical Mapping (Odessey GRS)

5 Geochemical Provinces

Carbonation and Chlorination (CHRISM)

Sulfur Cycling

Petrochemistry of Jake_M (MAHLI,APXS)

E. M. Stolper et al., Science 21 February 2014

Chemical Analysis of Rocknest (APXS)

2012 Meteorite - Tissint

H. Chennaoui Aoudjehane Science 9 November 2012

Future Directions

• Seismometers• Raman Spectroscopy (MarsExo 2018)• Sample Return