Carmen Winn Mentor: Mary Reid Northern Arizona University NASA Space Grant Symposium MANTLE LITHOLOGIES OF THE ZUNI BANDERA VOLCANIC FIELD: DETERMINED.

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Presentation transcript:

Carmen Winn Mentor: Mary Reid Northern Arizona University NASA Space Grant Symposium MANTLE LITHOLOGIES OF THE ZUNI BANDERA VOLCANIC FIELD: DETERMINED BY MINOR ELEMENT RATIOS OF OLIVINE

WHAT’S MELTING UNDER THE COLORADO PLATEAU? Young, mafic volcanism on the margins of Colorado Plateau: no clear mechanism of origin Evidence for heterogeneous source: what are the roles of multiple rock types melting? Image from www1.newark. ohio-state.edu/ Image from tmm/npl/mineralogy and/orPyroxenite? Peridotite

TRANSITION METAL RATIOS (Zn/Fe): A WINDOW INTO MELT SOURCE COMPOSITION Melting a rock: different elements/minerals behave differently as melting progresses When source controlled by olivine Zn/Fe shouldn’t change much Transition metals not very affected by degree of melt Olivine crystals can preserve element equilibrium in earliest stages of crystallization (closest to melting conditions) Image from Fe Zn Cr Co Mg Mn Ni V Image from serc.carleton.edu/

VISITING A SOURCE: ZUNI BANDERA VOLCANIC FIELD

WHY ZUNI BANDERA VOLCANIC FIELD? Zuni Bandera Volcanic Field: young, mafic field on eastern Colorado Plateau margin Mantle (melt source) samples found nearby at Mt. Taylor: testing the Zn/Fe ratio Rocks from wide range of melting depths present Image from umanitoba.ca/geoscience/

COLLECTING THE DATA: FIELDWORK Flows with high Mg content (closest to melting conditions) targeted for sampling Map produced and analyzed in ArcGIS using previously published data to target collection sites

COLLECTING THE DATA: LABWORK Grains of olivine separated and mounted Composition determined with Laser Ablation ICPMS Data from ICPMS calibrated to known basalt and mantle standards Laser Ablation ICPMS

Zn/Fe RATIOS COMPARED TO MELT EVOLUTION Increased differential melting

MELTING CONDITIONS OF ZUNI BANDERA BASALTS

DISCUSSION AND CONCLUSIONS Zn/Fe ratio changes little with increasing degree of melting Good ‘window’ for olivine-rich vs olivine-poor lithologies Zn/Fe ratios show more fertile source than standard CO Plateau and mid-ocean ridge (Iceland) mantle Not high enough for pyroxenite, but fertile peridotite possible Possible ‘plums’ of fertile mantle beneath the CO Plateau volcanic fields to induce melting Wide range of depth and temperature of melting with normal trends In the future: A more detailed analysis of the geochemistry of Zuni Bandera: other minor element ratios and trace elements What do other volcanic fields show about CO Plateau mantle?

ACKNOWLEDGEMENTS A big thank you to: Mary Reid, Research Mentor Kathleen Stigmon and Nadine Barlow Sean Rudzitis and Corinne LaViolette Arizona NASA Space Grant Northern Arizona University

QUESTIONS? Image from