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• W2467610177 abstract "Introduction: The martian meteorite Northwest Africa 7034 (and pairings) is a breccia that samples a variety of materials from the martian crust. Several previous studies have identified multiple types of igneous-textured clasts within the breccia [1-3], and these clasts have the potential to provide insight into the igneous evolution of Mars. One challenge presented by studying these small rock fragments is the lack of field context for this breccia (i.e., where on Mars it formed), so we do not know how many sources these small rock fragments are derived from or the exact formation history of these sources (i.e., are the sources mantle derived melt or melts contaminated by a meteorite impactor on Mars). Our goal in this study is to examine specific igneous-textured clast groups to determine if they are petrogenetically related (i.e., from the same igneous source) and determine more information about their formation history, then use them to derive new insights about the igneous history of Mars. We will focus on the basalt clasts, FTP clasts (named due to their high concentration of iron, titanium, and phosphorous), and mineral fragments described by [1] (Fig. 1). We will examine these materials for evidence of impactor contamination (as proposed for some materials by [2]) or mantle melt derivation. We will also test the petrogenetic models proposed in [1], which are igneous processes that could have occurred regardless of where the melt parental to the clasts was formed. These models include 1) derivation of the FTP clasts from a basalt clast melt through silicate liquid immiscibility (SLI), 2) derivation of the FTP clasts from a basalt clast melt through fractional crystallization, and 3) a lack of petrogenetic relationship between these clast groups. The relationship between the clast groups and the mineral fragments will also be explored. Methods: Thirty-six clasts from 12 thin sections and probe mounts from the UNM Meteorite Museum collection were analyzed for this study. Clasts were first imaged using the electron microprobe and FEG SEM at the University of New Mexico to determine textures and mineral modes. Individual mineral grains within clasts were then analyzed for major and minor element composition using WDS with the electron microprobe. Mineral compositions were combined with mineral modes and calculated densities to determine bulk clast composition. A subset of clasts was measured for a suite of 70 elements using LA-ICP-MS at the National High Magnetic Field Laboratory (as in [2]). Average compositions for each clast group were determined using a weighted average based on clast area." @default.
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• W2467610177 date "2016-01-01" @default.
• W2467610177 modified "2023-09-24" @default.
• W2467610177 title "PETROGENESIS OF IGNEOUS-TEXTURED CLASTS IN MARTIAN METEORITE NORTHWEST" @default.
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