By: Shane DePinto (NAU, Geophysics) Mentored by: Chris Okubo (USGS, Astrogeology) MAPPING APPARENT POROSITY OF SURFICIAL ROCKS DISCOVERED BY THE MARS EXPLORATION.

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Presentation transcript:

By: Shane DePinto (NAU, Geophysics) Mentored by: Chris Okubo (USGS, Astrogeology) MAPPING APPARENT POROSITY OF SURFICIAL ROCKS DISCOVERED BY THE MARS EXPLORATION ROVERS

THE BIG PICTURE Research on Mars helps us to understand the geologic history and past habitability of the planet Understanding porosity of rocks on Mars provides insight into potential hydrologic conditions in the past and the mechanical strength of these crust materials

HOW WE DID IT… During the early part of its mission, the Mars Explorer Rover Opportunity (MERB) ground and brushed in situ rock samples (45mm x 5mm) to remove weathering effects and loose sediment Its Microscopic Imager (MI) was used to take series of photos of each sample I compiled a database of MI data over the sample sites using the MER Analyst Notebook (a public database) and prepared/analyzed them

MY DATA Mosaicked photos from each site together Overlaid transparent layers on top and then deleted all apparent pore space from surface Compared pixel data from unaltered overlay layer and altered overlay to calculate apparent visible porosity for each sample

EXAMPLE: SOL x magnification

ANALYSIS I analyzed a total of 7 samples The samples had apparent porosities ranging from 20.4%-59.61% The porosity values are a bit high compared to Earth sedimentary porosity values, which are typically less than 20% Porosities as high as 50% are not unheard of, especially in evaporite-rich sediments The Mars rocks I analyzed are evaporite-rich sandstone Turns out Martian rocks are similar to Earth’s

PROBLEMS THAT I FOUND They stopped doing it! Sometime between sol … Lighting is variable between photos and that makes analysis difficult Porosity is a 3-dimensional aspect and analyzing it from a 2-D perspective is not extremely accurate

CONCLUSIONS It appears as if Martian sedimentary rocks have a similar structure to Earth’s sedimentary rocks This means cool things! Engineering aspects possibly, and verification of some of our geologic principles

ACKNOWLEDGEMENTS Thanks to my Mentor Chris Okubo! You were extremely helpful in every stage of this project and helped me with all questions Thank you NASA Thanks NAU Thank you Space Grant Symposium Questions?