caa a22 4500 465791018 CHVBK 20180323112024.0 cr unu---uuuuu 170327e19900701xx s 000 0 eng 10.1007/BF01575622 doi (NATIONALLICENCE)springer-10.1007/BF01575622 Oxidation state of mantle xenoliths from British Columbia, Canada [Elektronische Daten] [Dante Canil, David Virgo, Christopher Scarfe] Mössbauer spectra for 17 spinels separated from mantle xenoliths from six different eruptive centers in southern British Columbia, Canada were measured in an effort to accurately determine their Fe3+/total Fe ratios, and to examine lateral and vertical variations in oxygen fugacities (f o2's) calculated for these samples using published thermobarometric methods. Spectra acquired at 298 and 77 K suggest that both Fe2+ and Fe3+ are tetrahedrally coordinated in lherzolite spinels from this alkaline province. Calculatedf o2's for spinel lherzolites from British Columbia range from about 0.5 to 1.5 log units below the fayalite-magnetite-quartz (FMQ) oxygen buffer at 15 kbar using the thermobarometric method of O'Neill and Wall. Thesef o2's are on average more reducing than those reported for the upper mantle beneath the Massif Central and Japanese Arc and fall within the range for fresh MORB glasses and for lherzolite xenoliths from the southwestern United States and Mongolia. Significant variations inf o2 between samples from different eruptive centers with varying ages are absent, indicating that the oxidation state of the upper mantle was not affected by Cenozoic magmatism within this alkaline province. Springer-Verlag, 1990 Canil Dante Experimental Petrology Laboratory, Department of Geology, University of Alberta, T6G 2E3, Edmonton, Canada aut Virgo David Geophysical Laboratory, Carnegie Institution of Washington, 20008, Washington DC, USA aut Scarfe Christopher aut Contributions to Mineralogy and Petrology Springer-Verlag 104/4(1990-07-01), 453-462 0010-7999 104:4<453 1990 104 410 https://doi.org/10.1007/BF01575622 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF01575622 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Canil Dante Experimental Petrology Laboratory, Department of Geology, University of Alberta, T6G 2E3, Edmonton, Canada aut NATIONALLICENCE 700 1- Virgo David Geophysical Laboratory, Carnegie Institution of Washington, 20008, Washington DC, USA aut NATIONALLICENCE 700 1- Scarfe Christopher aut NATIONALLICENCE 773 0- Contributions to Mineralogy and Petrology Springer-Verlag 104/4(1990-07-01), 453-462 0010-7999 104:4<453 1990 104 410 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer