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Showing 1 to 20 of 37 for “"magma mixing"”.

  1. Titanite zoning and magma mixing

    McLeod, Graham WilliamUniversity of Glasgow2009

    … Caledonian age pluton that displays evidence of magma-mixing processes at depth and also contains notable amounts of titanite. Samples of different host granite and diorite enclave lithologies and relationships were documented and collected in order to asses the ability of titanite to retain …

    glasgow Repository record

  2. Deciphering the Signature of Magma Mixing: Examples from the Castle Creek Eruptive Period, Mount St. Helens, Washington

    Mattos, Seth Taylor2020

    … provide insight into the nature of the subjacent magma chamber during Castle Creek time. Presented here are whole-rock major and trace element data compiled from both published and unpublished works, along with 17 new whole rock trace element analyses and <sup>87</sup>Sr/<sup>86</sup>Sr isotopic …

    central-wash Repository record

  3. Petrogenesis of Eocene-Oligocene magmatism of the Sulphur Springs Range, central Nevada: The role of magma mixing

    Ryskamp, Elizabeth Balls2006

    … volcanic rocks in the range exhibit evidence of magma mixing and invite comparisons with other mineralized, Eocene mixed magma systems like the Bingham porphyry Cu deposit 300 km farther to the east. The Sulphur Springs igneous suite ranges compositionally through rhyolite, dacite, andesite and …

    byu Repository record

  4. Compositional Diversity in Arcs: A Record of Magmatic Processes in the Peru Coastal Batholith, Ica

    Ardila, Ana Maria Martinez

    … display evidence for crustal recycling and magma mixing. Evidence of physical and chemical processes operating during the formation of the Ica-Pisco complexes involves magma mixing and mingling as result of felsic and mafic interactions. Evidence of crustal recycling was identified from …

    loma-linda Repository record

  5. Deep Earth volatile cycles as revealed by basalt chemistry

    Matthews, Simon WilliamUniversity of Cambridge2019

    … using simple numerical models for concurrent magma mixing and degassing. It is demonstrated that the role of magma degassing was previously underestimated, and the variability in apparent mantle volatile concentrations is largely a result of variability in magma mixing and degassing. Using a …

    cambridge Repository record

  6. Petrologic Significance of Multiple Magmas in the Quottoon Igneous Complex, NW British Columbia and SE Alaska

    Thomas, Jay BradleyVirginia Tech1998

    … Complex (QIC) is a major Paleogene (65-56 Ma) magmatic body in NW British Columbia and SE Alaska that was emplaced along the Coast shear zone (CSZ). The QIC contains two different igneous suites that provide information about source regions, magmatic processes and evolving tectonic regimes that …

    vt Repository record

  7. ΚΑΤΑΝΟΜΗ ΤΩΝ ΣΤΟΙΧΕΙΩΝ ΤΗΣ ΟΜΑΔΑΣ ΤΟΥ ΛΕΥΚΟΧΡΥΣΟΥ (PGE) ΚΑΙ ΤΟΥ ΧΡΥΣΟΥ ΣΕ ΧΡΩΜΙΤΙΚΑ ΜΕΤΑΛΛΕΥΜΑΤΑ ΚΑΙ ΠΕΤΡΩΜΑΤΑ ΤΟΥ ΟΦΙΟΛΙΘΙΚΟΥ ΣΥΜΠΛΕΓΜΑΤΟ...

    Κωνσταντοπούλου, ΓαρυφαλιάΕθνικό και Καποδιστριακό Πανεπιστήμιο Αθηνών (ΕΚΠΑ)1990

    … OF FRACTIONAL CRYSTALLIZATION OF THE PARENT MAGMA. THE DISTANCE OF THE MAGMA CHAMBER FROM THE SPREADING CENTER AND THE MAGMA MIXING MECHANISM MAY PLAY AN IMPORTANT ROLE IN PGE DISTRIBUTION. THE ECONOMIC POTENTIAL OF PGE, IN OPHIOLITE COMPLEXES SEEMS LOW AT THE PRESENT TIME.

    greece Repository record

  8. Petrogenesis of the phase 1 gabbro-diorite of the Miocene Mt Perkins Pluton, northwest Arizona: Implications for the role of mantle-derived mafic magmas in calc-alkaline magma evolution

    Danielson, Lisa Renee

    Mafic magmas play a significant role in the evolution of calc-alkaline magma systems in convergent and extensional environments. The Miocene Mt. Perkins pluton, northwestern Arizona, was emplaced as a series of four discrete magma pulses into a country rock of Precambrian orthogneiss. Phase 1 is a …

    unlv Repository record

  9. Magma mingling : Die hydrodynamische Genese magmatischer Dispersionen

    Koopmann, AnselmUniversität Würzburg

    … Silikatschmelzen treten im gesamten Spektrum magmatischer Aktivität auf. Dabei kann es sowohl zu Magma mingling-, als auch zu Magma mixing-Prozessen kommen. Magmatische Enklaven und Dispersionen sind dabei Zeugen der ehemaligen Interaktion und Vermischung der beteiligten Schmelzen. Diese …

    wurz-thes Repository record

  10. Petrogenetic Relationship of the Postcaldera Eruptions of Mount Mazama, Crater Lake, Oregon; Evolution of a Sub-volcanic Magma Chamber Following a Large Silicic Eruption

    Tebbe, Michelle Leanna2020

    … formed a dome (Bacon et al., 2002). How magmatic systems evolve following a shallow, relatively large silicic eruption is the focus of this study. In situ geochemical analysis coupled with high-resolution textural images of plagioclase crystals in the four postcaldera volcanic edifices …

    central-wash Repository record

  11. Experimental studies of melting and crystallization processes in planetary interiors

    Krawczynski, Michael J.Massachusetts Institute of Technology and Woods Hole Oceanographic Institution2011

    … the conditions of origin for two high-titanium magmas from the Moon. The lunar experiments (Chapter 2) were designed to explore the e ects of variable oxygen fugacity (fO2) on the high pressure and high temperature crystallization of olivine and orthopyroxene in high-Ti magmas. The results of …

    woods-hole Repository record

  12. TEMPORAL AND SPATIAL VARIATIONS IN THE GEOCHEMISTRY AND MINERAOLOGY OF THE YOUNGER HISTORIC LAVAS OF MOUNT ETNA, SICILY

    Gyopari, Mark Christopher1988

    … individual flow fields are related to high-level magma mixing and crystal fractionation processes. The effects of mixing are demonstrated by incompatible trace element chemistry, phenocryst compositions and petrographic textures. Mixing involves several end-member magma compositions, some of which …

    plymouth Repository record

  13. Experimental studies of melting and crystallization processes in planetary interiors

    Krawczynski, Michael JamesMassachusetts Institute of Technology2011

    … the conditions of origin for two high-titanium magmas from the Moon. The lunar experiments (Chapter 2) were designed to explore the effects of variable oxygen fugacity (fo₂) on the high pressure and high temperature crystallization of olivine and orthopyroxene in high-Ti magmas. The results of …

    mit Repository record

  14. Petrogenesis of the reversely zoned Turtle pluton, Southeastern California

    Allen, Charlotte M.Virginia Polytechnic Institute and State University1989

    … a petrogenetic model of in situ, concomitant, magma mixing, and fractional crystallization of rhyolitic magma progressively mixed with an increasing volume of andesitic magma, all without chemical contribution from entrained basaltic enclaves. Hornblende geobarometry indicates the Turtle pluton …

    vt Repository record

  15. Applications of Melt Inclusions to Problems in Igneous Petrogenesis

    Severs, Matthew JeremiahVirginia Tech2007

    … the different igneous processes that magmas undergo is important for a variety of reasons including potential hazards associated with volcanoes in populated regions, magmatic hydrothermal ore deposition, and tectonic processes. One method of obtaining geochemical data that can help …

    vt Repository record

  16. Petrology and geochemistry of the recent eruption history at Rabaul Caldera, Papua New Guinea : implications for magmatic processes and recurring volcanic activity

    Patia, Herman2004

    … side of Rabaul Caldera...Comparison with dacite magma compositions erupted in 1937-1943, 1878, and during the recent prehistoric era and the presence of plagioclase phenocrysts reflecting older basalt-dacite magma interaction events (i.e., anorthite cores overgrown with thick andesine rims). The …

    aus-cath Repository record

  17. Petrology and geochemistry of the recent eruption history at Rabaul Caldera, Papua New Guinea : implications for magmatic processes and recurring volcanic activity

    Patia, Herman2004

    … side of Rabaul Caldera...Comparison with dacite magma compositions erupted in 1937-1943, 1878, and during the recent prehistoric era and the presence of plagioclase phenocrysts reflecting older basalt-dacite magma interaction events (i.e., anorthite cores overgrown with thick andesine rims). The …

    anu Repository record

  18. The controls of radioelement distribution in the Etive and Cairngorm granites: Implications for heat production

    Barritt, Sally D.The Open University1984

    … Scotland. These studies throw light on the magmatic history of the intrusions and. more particularly. on their radioelement geochemistry and heat production which is interpreted in a geothermal context. <br></br><br></br>The Etive Complex is a multiphase intrusion, ranging from diorite to …

    the-open-u Repository record

  19. GEOLOGY, GEOCHEMISTRY, AND TECTONIC IMPLICATIONS OF THE SALMON CREEK VOLCANIC SEQUENCE, OWYHEE MOUNTAINS, IDAHO

    NORMAN, MARC DOUGLASRice University1987

    … tectonic regimes in their systematic changes of magmatic style and composition through time. Cretaceous through Oligocene age rocks were produced from predominantly subduction-related magma sources associated with convergent tectonism along the Pacific margin of North America. Miocene age …

    rice Repository record

  20. Evolution of a Flood Basalt Crustal Magmatic System: In Situ Mineral Data and Computational Modeling of the Steens Basalt

    Graubard, Megan2021

    … of the crust via intrusion of mantle-derived magma, and change its composition through interaction between magma and crust. The Steens Basalt, located in southeast Oregon, erupted approximately 16.8 million years ago, and is the oldest member of the Columbia River Basalt Group, the youngest …

    central-wash Repository record

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