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    • Plusieurs versions

    High-grade calcareous metasediments from the Sawtooth Metamorphic Complex, Idaho, USA: evidence for passive margin strata and polymetamorphism within the Idaho batholith

    Fukai, Isis, Dutrow, Barbara L
    International Geology Review: Petrotectonic and geochemical researches on subduction zones-A celebration of the career of Sorena S. Sorensen, 26 April 2017, Vol.59(5-6), pp.753-778 [Revue évaluée par les pairs]

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    Manual of mineral science : (after James D. Dana)

    Klein, Cornelis
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    Magma‐facilitated transpressional strain partitioning within the Sawtooth metamorphic complex, Idaho: A zone accommodating Cretaceous orogen‐parallel translation in the Idaho batholith

    Ma, Chong, Foster, David A., Mueller, Paul A., Dutrow, Barbara L.
    Tectonics, March 2017, Vol.36(3), pp.444-465 [Revue évaluée par les pairs]

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    Subduction, fluids, and accessory minerals: a celebration of the career of Sorena S. Sorensen

    Ernst, W. G, Dutrow, Barbara L, Sisson, Virginia, Penniston-Dorland, Sarah
    International Geology Review: Petrotectonic and geochemical researches on subduction zones-A celebration of the career of Sorena S. Sorensen, 26 April 2017, Vol.59(5-6), pp.523-525 [Revue évaluée par les pairs]

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    Complex behavior of magma-hydrothermal processes: role of supercritical fluid

    Norton, Denis L., Dutrow, Barbara L.
    Geochimica et Cosmochimica Acta, 11/2001, Vol.65(21), pp.4009-4017 [Revue évaluée par les pairs]
    Elsevier (via CrossRef)
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    Titre: Complex behavior of magma-hydrothermal processes: role of supercritical fluid
    Auteur: Norton, Denis L.; Dutrow, Barbara L.
    Sujet: General Geochemistry ; Igneous And Metamorphic Petrology ; Analog Simulation ; Fluid Phase ; Geochemistry ; Hydrothermal Conditions ; Magmas ; Mathematical Models ; Mechanical Properties ; Numerical Models ; Supercritical Fluids ; Theoretical Studies ; Thermal Waters ; Water-Rock Interaction;
    Description: Magmas emplaced into the upper portions of the earth's crust are accompanied by extensive hydrothermal activity. Hydrothermal activity is represented as a system of coupled processes that dissipate thermal, mechanical, and chemical energy into the magma's lithocap, primarily by convection of H (sub 2) O-rich fluids. To investigate dynamical behavior of the system, a serial experiment was undertaken in which T(t) and P(t) values are computed for a pluton location during the time the region was subjected to near-critical hydrothermal convective flow. The consequent evolution of fluid buoyancy, V (sub x) rho (sub f) , ion stability, Delta G degrees , and fracture extension, delta L/L (sub 0) during this time indicates that variations in density gradients increase smoothly until 70,000 yr then burst into frequent, nearly equal 100-yr oscillations. Oscillations first increase in magnitude then decrease. Oscillatory behavior of state conditions derived from numerical experiments illustrate resonant effects in chemical equilibrium and fracture extension processes and show the sensitivity of the stable mineral assemblage to either of the competing chemical and mechanical transport processes. An oscillatory zoned tourmaline that formed at near-critical conditions of H (sub 2) O from the Geysers Geothermal deposit appears to provide evidence of nonlinear systematics in hydrothermal activity. Mathematical analogs to this system demonstrate that processes in this system record their dynamical behavior in the supercritical region and suggest that alteration events are generated by the complex, "chaotic" behavior of these processes. This type of behavior appears to be further augmented by strong divergence of H (sub 2) O-fluid properties toward + or - infinity at commonly encountered state conditions in the shallow reaches of magma-hydrothermal activity. System behavior elucidated here arises from affording for connectivity of processes by numerical experiments of hydrothermal activity for a region near the contact of a magma and its lithocap. The cumulative data from numerical experiments, equation-of-state (EOS) relationships, geologic and geochemical observations support the proposition that magma- hydrothermal processes should be thought of as complex dynamical systems whose behavior at state conditions near the supercritical region of the fluid is likely chaotic.
    Fait partie de: Geochimica et Cosmochimica Acta, 11/2001, Vol.65(21), pp.4009-4017
    Identifiant: 00167037 (ISSN); http (DOI)

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    The Spatial Thinking Workbook: A Research-Validated Spatial Skills Curriculum for Geology Majors

    Ormand, Carol J, Shipley, Thomas F, Tikoff, Basil, Dutrow, Barbara, Goodwin, Laurel B, Hickson, Thomas, Atit, Kinnari, Gagnier, Kristin, Resnick, Ilyse
    Journal of Geoscience Education, 01 November 2017, Vol.65(4), pp.423-434 [Revue évaluée par les pairs]

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    Nomenclature of the tourmaline-supergroup minerals

    Henry, Darrell J., Novák, Milan, Hawthorne, Frank C., Ertl, Andreas, Dutrow, Barbara L., Uher, Pavel, Pezzotta, Federico
    American Mineralogist, 2011, Vol.96(5), pp.895-913 [Revue évaluée par les pairs]
    Walter de Gruyter GmbH
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    Titre: Nomenclature of the tourmaline-supergroup minerals
    Auteur: Henry, Darrell J.; Novák, Milan; Hawthorne, Frank C.; Ertl, Andreas; Dutrow, Barbara L.; Uher, Pavel; Pezzotta, Federico
    Editeur: De Gruyter
    Sujet: Tourmaline ; Mineral Chemistry ; Nomenclature ; Substitutions ; Order-Disorder
    Description: A nomenclature for tourmaline-supergroup minerals is based on chemical systematics using the generalized tourmaline structural formula: XY 3 Z 6 (T 6 O 18 )(BO 3 ) 3 V 3 W, where the most common ions (or vacancy) at each site are X = Na 1+ , Ca 2+ , K 1+ , and vacancy; Y = Fe 2+ , Mg 2+ , Mn 2+ , Al 3+ , Li 1+ , Fe 3+ , and Cr 3+ ; Z = Al 3+ , Fe 3+ , Mg 2+ , and Cr 3+ ; T = Si 4+ , Al 3+ , and B 3+ ; B = B 3+ ; V = OH 1- and O 2- ; and W = OH 1- , F 1- , and O 2- . Most compositional variability occurs at the X, Y, Z, W, and V sites. Tourmaline species are defined in accordance with the dominant-valency rule such that in a relevant site the dominant ion of the dominant valence state is used for the basis of nomenclature. Tourmaline can be divided into several groups and subgroups. The primary groups are based on occupancy of the X site, which yields alkali, calcic, or X-vacant groups. Because each of these groups involves cations (or vacancy) with a different charge, coupled substitutions are required to relate the compositions of the groups. Within each group, there are several subgroups related by heterovalent coupled substitutions. If there is more than one tourmaline species within a subgroup, they are related by homovalent substitutions. Additionally, the following considerations are made. (1) In tourmaline-supergroup minerals dominated by either OH 1- or F 1- at the W site, the OH 1- -dominant species is considered the reference root composition for that root name: e.g., dravite. (2) For a tourmaline composition that has most of the chemical characteristics of a root composition, but is dominated by other cations or anions at one or more sites, the mineral species is designated by the root name plus prefix modifiers, e.g., fluor-dravite. (3) If there are multiple prefixes, they should be arranged in the order occurring in the structural formula, e.g., “potassium-fluor-dravite.”
    Fait partie de: American Mineralogist, 2011, Vol.96(5), pp.895-913
    Identifiant: 0003-004X (ISSN); 1945-3027 (E-ISSN); 10.2138/am.2011.3636 (DOI)

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    Teaching Mineralogy from the Core to the Crust

    Dutrow, Barbara L
    Journal of Geoscience Education, 01 January 2004, Vol.52(1), pp.81-86 [Revue évaluée par les pairs]
    Taylor & Francis (Taylor & Francis Group)
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    Titre: Teaching Mineralogy from the Core to the Crust
    Auteur: Dutrow, Barbara L
    Sujet: Geology
    Description: Mineralogy is commonly the first difficult geology course that a student major encounters. To provide a solid foundation and context for learning mineralogy, and, in an effort to enhance retention of information and facilitate learning, the...
    Fait partie de: Journal of Geoscience Education, 01 January 2004, Vol.52(1), pp.81-86
    Identifiant: 1089-9995 (ISSN); 2158-1428 (E-ISSN); 10.5408/1089-9995-52.1.81 (DOI)

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    Tourmaline in meta-evaporites and highly magnesian rocks: perspectives from Namibian tourmalinites

    Dutrow, Barbara L.
    European Journal of Mineralogy, October 2008, Vol.20(5), pp.889-904 [Revue évaluée par les pairs]
    IngentaConnect
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    Titre: Tourmaline in meta-evaporites and highly magnesian rocks: perspectives from Namibian tourmalinites
    Auteur: Dutrow, Barbara L.
    Sujet: Tourmaline ; Mineral Chemistry ; Tourmalinites ; Namibia ; Evaporite ; Magnesian ; Magnesian
    Description: Tourmaline from meta-evaporitic tourmalinites of the Duruchaus Formation of central Namibia reveal a common compositional trend that occurs in tourmaline from other meta-evaporite localities. The meta-evaporitic tourmalines are generally sodic, magnesian, moderately-to-highly depleted in Al, and enriched in Fe3+ and WO2− (calculated). They typically follow this trend along a join between "oxy-dravite" [Na(Mg2Al)(Al6)(Si6O18)(BO3)3(OH)3(O)] and povondraite [Na(Fe3+3)(Fe3+4Mg2)(Si6O18)(BO3)3(OH)3(O)]. Similar trends occur in the meta-evaporites at Alto Chapare (Bolivia), Challenger Dome (Gulf of Mexico), and Liaoning (China). This chemical feature is attributed to the influence of oxidizing, highly saline, boron-bearing fluids that are associated with these lithologies. In the Namibian tourmalines there are some deviations from this trend, which are considered to be a consequence of later overprints related to sulfate-silicate interactions and/or influx of reactive fluid. Tourmalines occurring in the highly magnesian high-pressure rocks (whiteschists and pyrope-coesite rocks) are distinctly more magnesian and fall close to the dravite and "oxy-dravite" compositions. These latter tourmaline compositions likely reflect the metasomatic processes that produced these unusual bulk compositions and/or the influx of a reactive fluid that eliminated any earlier chemical signatures of meta-evaporitic fluids or protoliths.
    Fait partie de: European Journal of Mineralogy, October 2008, Vol.20(5), pp.889-904
    Identifiant: 0935-1221 (ISSN)

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    Coupled heat and silica transport associated with dike intrusion into sedimentary rock: effects on isotherm location and permeability evolution

    Dutrow, Barbara L., Travis, Bryan J., Gable, Carl W., Henry, Darrell J.
    Geochimica et Cosmochimica Acta, 11/2001, Vol.65(21), pp.3749-3767 [Revue évaluée par les pairs]
    Elsevier (via CrossRef)
    Disponible
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    Titre: Coupled heat and silica transport associated with dike intrusion into sedimentary rock: effects on isotherm location and permeability evolution
    Auteur: Dutrow, Barbara L.; Travis, Bryan J.; Gable, Carl W.; Henry, Darrell J.
    Sujet: Igneous And Metamorphic Petrology ; Aureoles ; Carter Hope-Fee Well ; Case Studies ; Contact Metamorphism ; Cores ; Data Processing ; Digital Simulation ; Dikes ; Emplacement ; Fluid Dynamics ; Geochemistry ; Heat Transfer ; Igneous Rocks ; Intrusions ; Isotherms ; Lamprophyres ; Louisiana ; Mass Transfer ; Metamorphic Rocks ; Metamorphism ; Metasedimentary Rocks ; Metasomatism ; Mineral Assemblages ; Monchiquite ; Morehouse Parish Louisiana ; Northeastern Louisiana ; Permeability ; Petroleum ; Plutonic Rocks ; Precipitation ; Sedimentary Rocks ; Silica ; Solution ; Thermal History ; Thermal Maturity ; Thermochemical Properties ; United States ; Water-Rock Interaction;
    Description: An 11-meter-wide alkalic monchiquite dike recovered from the subsurface of Louisiana has produced a metasomatic aureole in the adjacent interbedded carbonate mudstones and siltstones. The asymmetric contact aureole, which extends nearly 6 m above and 4 m below the intrusion, contains the metamorphic minerals, diopside, pectolite, fluor-apophyllite, fluorite, and garnet. A series of coupled heat and mass transport calculations was undertaken to provide thermal constraints for the aureole, in the absence of robust geothermometric assemblages, and insights into accompanying mass transport associated with the sedimentary rock-dike system. Calculations were completed for systems with homogeneous, anisotropic, and layered permeability, kappa . Transport, dissolution, and precipitation of silica were also incorporated into calculations. All systems modeled indicate that the thermal pulse waned in approximately 3 yr with a return to background temperatures in approximately 10 yr. Heat and fluid transport produce maximum temperature isotherms that are distinctly different in spatial extent and lateral variability for each numerical system. The homogeneous kappa case produced isotherms that pinch and swell vertically above the dike and have large lateral variations, in contrast to the anisotropic kappa case that produced a single large plume above the dike. The layered system kappa case produced the most spatially extensive thermal aureole, unlike that recorded in the rocks. Addition of dissolved silica to the flow system significantly impacts the calculated transport of heat and fluid, primarily due to density changes that affect upwelling dynamics. Although precipitation and dissolution of SiO (sub 2) can affect flow through the feedback to permeability, kappa changes were found to be minor for these system conditions. Where kappa decreased, flow was refocused into higher kappa zones, thus mitigating the kappa differences over time. This negative feedback tends to defocus flow and provides a mechanism for lateral migration of plumes. Coupled heat and silica transport produces a complex isotherm geometry surrounding the intrusion due to formation of upwelling and downwelling plumes and lateral translation of plumes, leading to variability in the isotherm pattern that does not reflect the inherent heterogeneity of the initial material properties. Initial heterogeneities in kappa are not a prerequisite for the development of a complicated flow and transport pattern. In addition, if isotherms reflect isograds, these calculations demonstrate that isograds may not form uniform structures with isograd boundaries characterized by their distance from the heat source.
    Fait partie de: Geochimica et Cosmochimica Acta, 11/2001, Vol.65(21), pp.3749-3767
    Identifiant: 00167037 (ISSN); http (DOI)