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Material Type: Assignment; Professor: McMillan; Class: Global Geochemical Systems; Subject: GEOLOGY; University: New Mexico State University-Main Campus; Term: Spring 2005;
Typology: Assignments
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GEOL 567 Name ____________________________ Global Geochemical Systems Problem Set One Major Element Models, Taos Plateau Volcanic Field, NM 50 points due 11 Feb 05 You are supplied with major element analyses for 24 Plio-Pleistocene lavas from the Taos Plateau volcanic field in northern New Mexico (McMillan and Dungan, 1988; Dungan et al., 1986). The data are in an EXCEL file that is available on my website. You also have it on CD. The three major rock types (basalt, andesite, and dacite) are comagmatic, based on their close relationships in space and time, and their similar major and trace element characteristics. Phenocryst assemblages are as follows: basalt olivine, Cr-spinel, + plagioclase andesite olivine + plagioclase + augite dacite plagioclase + augite + orthopyroxene Your goal in this assignment is to determine whether this magmatic system evolved by fractional crystallization or whether assimilation played a role. Use two modeling methods: mass balance (using a spreadsheet) and Pearce element ratios. Your final project must contain the following items: