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SYNTHESIS OF CHEMICAL PROVINCES ON MARS AND THEIR GEOLOGIC INTERPRETATIONS

Introduction: A trilogy of multivariate analysis methods helped to constrain a range of Martian geologic processes and delineated chemical provinces using the dataset from Mars Odyssey Gamma and neutron spectroscopy (GRS) [1-3]. However, an integrated work across those methods and reinterpretations to address the latest chemical maps is lacking. Consequently, we refined the prior methods to delineate chemical provinces with the latest chemical maps and interpret underlying geologic processes [13]. The present study considered all major and trace elements, volatiles (H2O, Cl and S), and some elements essential for primary and secondary mineralogy like Al, Ca. Eight key chemical provinces are apparent from our preliminary results, overlapping with (Amazonis–Tharsis, Lunae Planum (LP), Southern Acidalia Planum (SAP), Medusae Fossae Formation (MFF), Meridiani Planum, Southern highlands, Hesperia Planum, and west of Utopia Basin) (Figure 1). Geochemical variation has been observed across the topographic dichotomy boundary. However, a unifying hypothesis to explain such variation has not yet been posited. Therefore, we consider three provinces (LP, MFF and SAP), lying near the dichotomy boundary. These regions demonstrate the chemical diversity of the surface and can inform the contribution of local and regional sources for surficial materials. Data and Methods: Mars Odyssey based GRS global mass fraction elemental maps are considered with approximate area coverage from ~±45 N projected at a resolution of 5 × 5. Our three distinct multivariate statistical techniques are Non-Hierarchical clustering (N-HC) [2], Hierarchical clustering complemented with Principal Component Analysis (HC-PCA) [3] and improvised student's t-test to delineate Gaussian tail cluster (t-GTC) & that exceeds an area threshold [1].