1,722,213 research outputs found
Powell, R D, 404862
No full textThis record was harvested from a previous catalogue system and will be withdrawn in 2025. Information in this record may be superseded or incomplete. Visit this record in UMA's new catalogue at: https://archives.library.unimelb.edu.au/nodes/view/411424Surname: POWELL. Given Name(s) or Initials: R D. Military Service Number or Last Known Location: 404862. Missing, Wounded and Prisoner of War Enquiry Card Index Number: 34549.227135
Item: [2016.0049.43688] "Powell, R D, 404862
Powell, R M B, 54762
No full textThis record was harvested from a previous catalogue system and will be withdrawn in 2025. Information in this record may be superseded or incomplete. Visit this record in UMA's new catalogue at: https://archives.library.unimelb.edu.au/nodes/view/411422Surname: POWELL. Given Name(s) or Initials: R M B. Military Service Number or Last Known Location: 54762. Missing, Wounded and Prisoner of War Enquiry Card Index Number: SEA-3055.227133
Item: [2016.0049.43686] "Powell, R M B, 54762
Powell, R C J, 4121179
No full textThis record was harvested from a previous catalogue system and will be withdrawn in 2025. Information in this record may be superseded or incomplete. Visit this record in UMA's new catalogue at: https://archives.library.unimelb.edu.au/nodes/view/411430Surname: POWELL. Given Name(s) or Initials: R C J. Military Service Number or Last Known Location: 4121179. Missing, Wounded and Prisoner of War Enquiry Card Index Number: 56088.227141
Item: [2016.0049.43694] "Powell, R C J, 4121179
The Book of Kells, the Book of Durrow.
No full textPowell R. The Book of Kells, the Book of Durrow. In: Scriptorium, Tome 10 n°1, 1956. pp. 3-21
The formation of eclogitic metatroctolites and a general petrogenetic grid in the Na2O - CaO - FeO - MgO - Al2O3 - SiO2 - H2O (NCFMASH) system.
No full textEclogite facies metatroctolites from a variety of Western Alps localities (Voltri, Monviso, Lanzo, Allalin, Zermat-Saas, etc.) that preserve textural evidence of their original form as bimineralic olivine-plagioclase rocks are considered in terms of calculated mineral equilibria in the system Na2O-CaO-FeO-MgO-Al2O3-SiO2-H2O (NCFMASH). Pseudosections, based on a new petrogenetic grid for NCFMASH presented here, are used to unravel the metamorphic history of the metatroctolites, considering the rocks to consist of different composition microdomains corresponding to the original olivine and plagioclase grains. On the basis that the preservation of the mineral assemblage in each microdomain will tend to be from where on a rock's P-T path the metamorphic fluid phase is used up via rehydration reactions, P-T pseudosections contoured for water content, and P-T path-M-H2O (amount of water) pseudosections, are used to examine fluid behaviour in each microdomain. We show that the different microdomains are likely to preserve their mineral assemblages from different places on the P-T path. For the olivine microdomain, the diagnostic mineral assemblage is chloritoid + talc (+ garnet + omphacite). The preservation of this assemblage, in the light of the closed system P-T path-MH2O relationships, implies that the microdomain loses its metamorphic fluid as it starts to decompress, and, in the absence of subsequent hydration, the high pressure mineral assemblage is then preserved. In the plagioclase microdomain, the diagnostic assemblage is epidote (or zoisite) + kyanite + quartz suggesting a lower pressure (of about 2 GPa) than for the olivine microdomain. In the light of P-T path-M-H2O relationships, development of this assemblage implies breakdown of lawsonite across the lawsonite breakdown reaction, regardless of the maximum pressure reached. It is likely that the plagioclase microdomain was mainly fluid-absent prior to lawsonite breakdown, only becoming fluid-present across the reaction, then immediately becoming fluid-absent again
Eclogite-facies sea-floor hydrothermally-altered rocks: calculated phase equilibria for an example from the western Alps at Servette.
No full textIn the St. Marcel Valley at Servette in the Western Alps metabasic rocks crop out that were variably altered in a sea-floor hydrothermal system. Successively, they were metamorphosed to eclogite facies. This was used as an opportunity to explore the range of eclogite-facies mineral assemblages that can develop in such altered rocks. The continuum is represented qualitatively by a series of rock-types: eclogite, glaucophanite, talc schist and chlorite schist, with increasing alteration, supposed to all have involved eclogite-facies mineral assemblages. Later, they were variably retrogressed under greenschist-facies conditions.
The eclogite-facies mineral assemblages developed from the broad alteration trend represented by the four rock-types have been forward-modelled in terms of three composition vectors. P-T pseudo-sections for the compositions used to represent the rock-types suggest that a P-T of about 22 kbar and 600°C is consistent for the conditions of formation of the rock-types. T-X pseudo sections along the composition vectors are used to represent the alteration continuum showing the way the mineral assemblages are affected by the degree of alteration
Subducted hydrothermally altered oceanic crust: what happens in subducion zones? A modelling perspective from the Western Alps ophiolites
No full textSubducted hydrothermally altered oceanic crust: what happens in subducion zones? A modelling perspective from the Western Alps
No full text
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
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