Accepted Manuscript The Northwest Africa 8159 (NWA 8159) Martian Meteorite Part 2. Spinel-or- thopyroxene intergrowths. A record of fO 2 and crust-basalt interactions Charles K. Shearer, Aaron S. Bell, Christopher D.K. Herd, Paul V. Burger, Paula Provencio, Zachary D. Sharp, James J. Papike PII: S0016-7037(19)30318-7 DOI: https://doi.org/10.1016/j.gca.2019.05.034 Reference: GCA 11260 To appear in: Geochimica et Cosmochimica Acta Received Date: 14 April 2018 Revised Date: 20 May 2019 Accepted Date: 24 May 2019 Please cite this article as: Shearer, C.K., Bell, A.S., Herd, C.D.K., Burger, P.V., Provencio, P., Sharp, Z.D., Papike, J.J., The Northwest Africa 8159 (NWA 8159) Martian Meteorite Part 2. Spinel-orthopyroxene intergrowths. A record of fO 2 and crust-basalt interactions, Geochimica et Cosmochimica Acta (2019), doi: https://doi.org/10.1016/ j.gca.2019.05.034 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.