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Ultra-High Pressure (UHP) rocks of the Cordillera Septinrional, Dominican Republic

Ultra-High Pressure (UHP) rocks of the Cordillera Septinrional, Dominican Republic. Bonnie N. Broman Appalachian State University. BACKGROUND:.

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Ultra-High Pressure (UHP) rocks of the Cordillera Septinrional, Dominican Republic

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  1. Ultra-High Pressure (UHP) rocks of the Cordillera Septinrional, Dominican Republic Bonnie N. Broman Appalachian State University

  2. BACKGROUND: • The Cordillera Septintrional, which consists of metamorphic and igneous basement rocks overlain by Miocene-Eocene siliciclastic and carbonate rocks, is located in the northern part of the Dominican Republic • Stratigraphic windows (inliers) of metamorphic and igneous rocks are exposed in various places such as the Rio San Juan (RSJ) complex

  3. Within the RSJ, are three rock types of particular interest in regards to magma genesis:garnet peridotite, garnet clinoproxenite, and corundum bearing garnet clinnopyroxenite (composed of clinopyroxene, garnet, spinel, corundum and secondary hornblende with evidence of a magmatic origin) Garnet Clinopyroxenite Garnet Peridotite

  4. Corundum-bearing Garnet Clinopyroxenite thin-section

  5. RESEARCH GOALS: • To determine Pressure and Temperature conditions under which these rocks form

  6. METHODS: • Field work which consisted of collecting samples and looking at relationships within the boulders in the Dominican Republic

  7. Analyze our samples using the SEM and EDAX • SEM PROCESS: • We obtained homogenous natural mineral standards to analyze and compare to the samples we collected • Analyze sample DR03-12b which is the corundum-bearing garnet clinopyroxenite to determine the exact composition of the minerals, mainly garnet, clinopyroxenite, spinel, and corundum • Collected data for garnet, and clinopyroxene using our standards SEM image of garnet standard SEM image of augite standard

  8. DATA: Example of Garnet analysis

  9. Example of clinopyroxene analysis

  10. REMAINING WORK: • Normalize analyses • Determine pressure and temperature conditions at which the compositions of these minerals are stable

  11. THANK YOU!

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