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The effects of re‐homogenization on plagioclase hosted melt inclusions

Creator:: Nielsen, Roger L.
Abstract:: Melt inclusions trapped in phenocrysts provide a unique picture of magma systems prior to modification by crustal processes. However, post-entrapment crystallization complicates their interpretation. Re-heating the phenocryst to the temperature of entrapment is a commonly applied method to recover the original melt composition. To understand the effects of re-homogenization, we...
Resource Type:: Article
Full Text:: (95) 00366-5. Nielsen, R. L., J. Crum, R. Bourgeois, K. Hascall, L. M. Forsythe, M. R. Fisk, and D. M

Origin of minor and trace element compositional diversity in anorthitic feldspar phenocrysts and melt inclusions from the Juan de Fuca Ridge

Creator:: Adams, David T., Nielsen, Roger L., Kent, Adam J. R., and Tepley, Frank J., III
Abstract:: Melt inclusions trapped in phenocryst phases are important primarily due to their potential of preserving a significant proportion of the diversity of magma composition prior to modification of the parent magma array during transport through the crust. The goal of this investigation was to evaluate the impact of formational and...
Resource Type:: Article
Full Text:: ) Roger L. Nielsen and Adam J. R. Kent Department of Geosciences, Oregon State University, 104 Wilkinson

The petrogenesis of plagioclase-phyric basalts at mid-ocean ridges

Creator:: Lange, Amy E., Nielsen, Roger L., Tepley, Frank J., III, and Kent, Adam J. R.
Abstract:: Plagioclase ultraphyric basalts (PUBs) have been sampled along most mid-ocean ridges with ultraslow to intermediate spreading rates. Over the past 40 years, the prevalent models for their origin assume positive buoyancy of plagioclase in basaltic liquids resulting in selective concentration of plagioclase phenocrysts by floatation. However, when the global population...
Resource Type:: Article

In situ enrichment of ocean crust microbes on igneous minerals and glasses using an osmotic flow‐through device

Creator:: Smith, Amy, Popa, Radu, Fisk, Martin, Nielsen, Mark, Wheat, C. Geoffrey, Jannasch, Hans W., Fisher, Andrew T., Becker, Keir, Sievert, Stefan M., and Flores, Gilberto
Abstract:: The Integrated Ocean Drilling Program (IODP) Hole 1301A on the eastern flank of Juan de Fuca Ridge was used in the first long-term deployment of microbial enrichment flow cells using osmotically driven pumps in a subseafloor borehole. Three novel osmotically driven colonization systems with unidirectional flow were deployed in the...
Resource Type:: Article
Full Text:: Atmospheric Sciences, Oregon State University, Corvallis, Oregon 97331, USA Mark Nielsen Organismic and

Temporal and crustal effects on differentiation of tholeiite to calcalkaline and ferro-trachytic suites, High Lava Plains, Oregon, USA

Creator:: Streck, Martin J. and Grunder, Anita L.
Abstract:: Strongly bimodal, basalt-rhyolite volcanism of the High Lava Plains Province of Oregon followed the Middle Miocene flood basalts of the Pacific Northwest and extends to recent time. During the 8 m.y. of volcanism recorded in the central High Lava Plains, in western Harney Basin, three distinct mafic magmatic trends originate...
Resource Type:: Article
Full Text:: , Oregon, USA Martin J. Streck Department of Geology, Portland State University, Portland, Oregon 97207

The sources of volatile and fluid-mobile elements in the Sunda arc: A melt inclusion study from Kawah Ijen and Tambora volcanoes, Indonesia

Creator:: Vigouroux, Nathalie, Wallace, Paul J., Williams-Jones, Glyn, Kelley, Katherine, Kent, Adam J. R., and Williams-Jones, Anthony E.
Abstract:: Subduction zone recycling of volatiles (H₂O, Cl, S, F) is controlled by the nature of subducted materials and the temperature-pressure profile of the downgoing slab. We investigate the variability in volatile and fluid-mobile trace element enrichment in the Sunda arc using melt inclusion data from Kawah Ijen and Tambora volcanoes,...
Resource Type:: Article
Full Text:: , Canada (nvigouroux@alterrapower.ca) Paul J. Wallace Department of Geological Sciences, University of

Insights into the late Cenozoic configuration of the laurentide Ice Sheet from ⁴⁰Ar/³⁹Ar dating of glacially transported minerals in midcontinent tills

Creator:: Roy, Martin, Clark, Peter U., Duncan, Robert A., and Hemming, Sidney R.
Abstract:: Glacial sedimentary sequences in the north central United States record multiple advances of the Laurentide Ice Sheet (LIS) since ~2 Ma. Although the tills found in these sequences were deposited by southward flowing glacial lobes, little information is available on the geometry of flow lines in the interior of the...
Resource Type:: Article
Full Text:: ; Prest and Nielsen, 1987; Veillette, 2004]. The precise amount of glacial transport in the course of a

Evidence of biological activity in Hawaiian subsurface basalts

Creator:: Fisk, Martin R., Storrie-Lombardi, M. C., Douglas, S., Popa, R., McDonald, G., and Di Meo-Savoie, C.
Abstract:: The Hawaii Scientific Drilling Program (HSDP) cored and recovered igneous rock from the surface to a depth of 3109 m near Hilo, Hawaii. Much of the deeper parts of the hole is composed of hyaloclastite (fractured basalt glass that has been cemented in situ with secondary minerals). Some hyaloclastite units...
Resource Type:: Article

Acoustics variability of air gun signals recorded at intermediate ranges within the Lau Basin

Creator:: Bohnenstiehl, DelWayne R., Scheip, Corey M., Matsumoto, Haru, and Dziak, Robert P.
Abstract:: During January–February 2009, an active-source seismic survey was performed over the Eastern Lau Spreading Center in the Lau Back-Arc Basin (21°S, 176°S). Acoustic signals generated by the R/V Langseth's 36-gun pneumatic source array were recorded within the deep sound channel at offsets of 29–416 km. The local ocean acoustic environment...
Resource Type:: Article
Full Text:: change in sound level relative to a reference dis- tance (Ro) of one meter: TL ¼ xj j log10 R=Roð Þ dB

Elemental abundance distributions in suboceanic basalt glass: Evidence of biogenic alteration

Creator:: Storrie-Lombardi, M. C. and Fisk, Martin R.
Abstract:: The alteration of subseafloor volcanic glass from three locations is qualitatively attributed to biological (biotic) or chemical (abiotic) reactions on the basis of microscopic morphology of the boundary between the unaltered and altered glass. Eleven-element composition of fresh basalt glass (sideromelane) and its alteration products were determined by electron microprobe....
Resource Type:: Article
Full Text:: ., 1992] that the jth component of the output vector will represent the probability for class j given the

ScholarsArchive@OSU

The effects of re‐homogenization on plagioclase hosted melt inclusions

Origin of minor and trace element compositional diversity in anorthitic feldspar phenocrysts and melt inclusions from the Juan de Fuca Ridge

The petrogenesis of plagioclase-phyric basalts at mid-ocean ridges

In situ enrichment of ocean crust microbes on igneous minerals and glasses using an osmotic flow‐through device

Temporal and crustal effects on differentiation of tholeiite to calcalkaline and ferro-trachytic suites, High Lava Plains, Oregon, USA

The sources of volatile and fluid-mobile elements in the Sunda arc: A melt inclusion study from Kawah Ijen and Tambora volcanoes, Indonesia

Insights into the late Cenozoic configuration of the laurentide Ice Sheet from ⁴⁰Ar/³⁹Ar dating of glacially transported minerals in midcontinent tills

Evidence of biological activity in Hawaiian subsurface basalts

Acoustics variability of air gun signals recorded at intermediate ranges within the Lau Basin

Elemental abundance distributions in suboceanic basalt glass: Evidence of biogenic alteration

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