Search Results - "Rebecca A. Lange"

Evidence of Rapid Phenocryst Growth of Olivine During Ascent in Basalts From the Big Pine Volcanic Field: Application of Olivine‐Melt Thermometry and Hygrometry at the Liquidus by Sarah K. Brehm, Rebecca A. Lange

“…Abstract The Quaternary Big Pine (BP) volcanic field in eastern California is notable for the occurrence of mantle xenoliths in several flows. This points to…”
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Constraints on Early Paleozoic Deep‐Ocean Oxygen Concentrations From the Iron Geochemistry of the Bay of Islands Ophiolite by Stolper, Daniel A., Pu, Xiaofei, Lloyd, Max K., Christensen, Nikolas I., Bucholz, Claire E., Lange, Rebecca A.

“…The deep ocean is generally considered to have changed from anoxic in the Precambrian to oxygenated by the Late Paleozoic (∼420–400 Ma) due to changes in…”
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Phenocryst complexity in andesites and dacites from the Tequila volcanic field, Mexico: resolving the effects of degassing vs. magma mixing by Frey, Holli M., Lange, Rebecca A.

“…The petrology of five phenocryst-poor (2–5%) andesites and dacites, all of which were erupted from different short-lived, monogenetic vents, is compared to…”
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Crystal-poor, multiply saturated rhyolites (obsidians) from the Cascade and Mexican arcs: evidence of degassing-induced crystallization of phenocrysts by Waters, Laura E., Lange, Rebecca A.

“…A detailed petrological study is presented for six phenocryst-poor obsidian samples (73–75 wt% SiO 2 ) erupted as small volume, monogenetic domes in the…”
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New acoustic velocity measurements on CaO-MgO-Al2O3-SiO2 liquids: Reevaluation of the volume and compressibility of CaMgSi2O6-CaAl2Si2O8 liquids to 25 GPa by Ai, Yuhui, Lange, Rebecca A.

“…Relaxed sound speed measurements on 12 liquids in the CaO‐MgO‐Al2O3‐SiO2 (CMAS) system have been performed from 1410 to 1620°C at 1 bar with a frequency sweep…”
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Application of an Improved Olivine-Melt Thermometer/Hygrometer to the Colima Cone Basanites and Minettes of Western Mexico: Implications for the Mantle Source of Unusually High-MgO Melts by Pu, Xiaofei, Lange, Rebecca A, Moore, Gordon M

“…Abstract A collection of quaternary, high-MgO (≤13.4 wt%) basanite and minette cinder and lava cones, with an enhanced arc geochemical signature, are located…”
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No effect of H2O degassing on the oxidation state of magmatic liquids by Waters, Laura E., Lange, Rebecca A.

“…The underlying cause for why subduction-zone magmas are systematically more oxidized than those formed at mid-ocean spreading ridges is a topic of vigorous…”
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The Density of Hydrous Magmatic Liquids by Ochs, Frederick A., Lange, Rebecca A.

“…Density measurements on several hydrous (≤ 19 mole percent of H$_2$O) silicate melts demonstrate that dissolved water has a partial molar volume…”
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Multi-technique equation of state for Fe2SiO4melt and the density of Fe-bearing silicate melts from 0 to 161 GPa by Thomas, Claire W., Liu, Qiong, Agee, Carl B., Asimow, Paul D., Lange, Rebecca A.

“…We have conducted new equation of state measurements on liquid Fe2SiO4in a collaborative, multi‐technique study. The liquid density (ρ), the bulk modulus (K),…”
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Do carbonate liquids become denser than silicate liquids at pressure? Constraints from the fusion curve of K2CO3 to 3.2 GPa by Liu, Qiong, Tenner, Travis J., Lange, Rebecca A.

“…Brackets on the melting temperature of K2 CO3 were experimentally determined at 1.86 0.02 GPa (1,1631,167 C), 2.79 0.03 GPa (1,1871,195 C), and3.16 0.04 GPa…”
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Origin of alkali olivine basalts and hawaiites in the Western Mexican Arc; evidence of rapid phenocryst growth and magma mixing during ascent along fractures by Mesa, Juliana, Lange, Rebecca A

“…A detailed petrological study is presented to constrain the origin of a suite of alkali olivine basalt and hawaiite (>5 wt% MgO) lavas that were erupted in a…”
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Origin of Compositional Gradients with Temperature in the High-SiO2 Rhyolite Portion of the Bishop Tuff: Constraints on Mineral–Melt–Fluid Reactions in the Parental Mush by Jolles, Jameson S R, Lange, Rebecca A

“…Abstract The Bishop Tuff (BT), erupted from the Long Valley caldera in California, displays two types of geochemical gradients with temperature: one is related…”
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Rapid Crystallization of Plagioclase Phenocrysts in Silicic Melts during Fluid-saturated Ascent: Phase Equilibrium and Decompression Experiments by Waters, Laura E, Andrews, Benjamin J, Lange, Rebecca A

“…Three crystal-poor obsidian samples (one dacite, 67 wt % SiO sub(2); two rhyolites, 73 and 75 wt % SiO sub(2)), which erupted effusively from monogenetic…”
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The density and compressibility of CaO–FeO–SiO2 liquids at one bar: Evidence for four-coordinated Fe2+ in the CaFeO2 component by Guo, Xuan, Lange, Rebecca A., Ai, Yuhui

“…Double-bob density measurements using molybdenum bobs in a reducing atmosphere were made on hedenbergite (CaFeSi2O6) liquid and four other CaO–FeO–SiO2 (CFS)…”
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High-resolution Fe–Ti oxide thermometry applied to single-clast pumices from the Bishop Tuff: a re-examination of compositional variations in phenocryst phases with temperature by Jolles, Jameson S. R., Lange, Rebecca A.

“…Numerous analyses of multiple ilmenite, titanomagnetite, sanidine, plagioclase, biotite, orthopyroxene, and clinopyroxene crystals (when present) in each of 24…”
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Complex Phenocryst Textures and Zoning Patterns in Andesites and Dacites: Evidence of Degassing-Induced Rapid Crystallization? by Crabtree, Stephen M., Lange, Rebecca A.

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An experimental study of $$ ^{{{\text{Fe}}^{2 + } {-}{\text{Mg}}}} K_{\text{D}} $$ between orthopyroxene and rhyolite: a strong dependence on H2O in the melt by Waters, Laura E., Lange, Rebecca A.

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Density and sound speed measurements on model basalt (An–Di–Hd) liquids at one bar: New constraints on the partial molar volume and compressibility of the FeO component by Guo, Xuan, Lange, Rebecca A., Ai, Yuhui

“…Density and sound speed measurements were obtained over a wide range of temperature for three model basalt liquids in the An–Di–Hd…”
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A revised model for the density and thermal expansivity of K2O-Na2O-CaO-MgO-Al2O3-SiO2 liquids from 700 to 1900 K: Extension to crustal magmatic temperatures by Lange, Rebecca A

“…A revised model for the volume and thermal expansivity of K20-Na2O-CaO-MgO-Al203-SiO2 liquids, which can be applied at crustal magmatic temperatures, has been…”
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Multi-technique equation of state for Fe2SiO4 melt and the density of Fe-bearing silicate melts from 0 to 161 GPa by Thomas, Claire W, Liu, Qiong, Agee, Carl B, Asimow, Paul D, Lange, Rebecca A

“…We have conducted new equation of state measurements on liquid Fe2SiO4 in a collaborative, multi-technique study. The liquid density (), the bulk modulus (K),…”
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