ORCID Profile
0000-0002-9370-4239
Current Organisation
Universitet i Oslo
Does something not look right? The information on this page has been harvested from data sources that may not be up to date. We continue to work with information providers to improve coverage and quality. To report an issue, use the Feedback Form.
Publisher: Geological Society of London
Date: 05-02-2019
DOI: 10.1144/JGS2018-081
Publisher: Wiley
Date: 09-2008
Publisher: Wiley
Date: 06-2009
Publisher: Proceedings of the National Academy of Sciences
Date: 30-03-2015
Abstract: The Iceland hotspot is widely thought to be the surface expression of a deep mantle plume from the core–mantle boundary that can be traced back in time at least 62 My. However, some lavas contain continental material, which has previously been proposed to have been recycled through the plume. Here, we argue that the plume split off a sliver of continent from Greenland in the Early Eocene. This sliver is now located beneath southeast Iceland where it locally contaminates some of the plume-derived magmas.
Publisher: Elsevier BV
Date: 12-2014
Publisher: Geological Society of London
Date: 2013
DOI: 10.1144/JGS2012-066
Publisher: Wiley
Date: 10-08-2022
DOI: 10.1111/GGR.12444
Abstract: The Khan River (Namibia) and Bear Lake (Canada) titanites are investigated as potential reference materials (RM) for LA‐ICP‐MS applications. The Bear Lake titanite is texturally and compositionally homogeneous. The Khan River titanite is texturally heterogeneous and characterised by variable trace element compositions and total rare earth element contents. However, both titanites have consistent U‐Pb and Nd‐isotope ratios. U‐Pb isotope dilution‐thermal ionisation mass spectrometry analyses yielded Pb c ‐uncorrected intercept ages of 516.3 ± 1.3 Ma (2 s , n = 5, MSWD = 2.4) and 1067.81 ± 0.74 Ma (2 s , n = 4, MSWD = 0.35) for Khan River and Bear Lake titanites, respectively. Multiple U‐Pb LA‐SF/MC‐ICP‐MS analyses gave consistent Pb c ‐uncorrected intercept ages for both, Khan River (517 ± 1/5 Ma, 2 s , n = 262, MSWD = 1.5) and Bear Lake (1070 ± 1/11 Ma, 2 s , n = 325, MSWD = 0.88). U‐Pb SHRIMP analyses on the same material returned identical (within uncertainty) ages. Khan River and Bear Lake gave internally consistent solution MC‐ICP‐MS 143 Nd/ 144 Nd ratios of 0.511587 ± 0.000027 (2 s , n = 2) and 0.512321 ± 0.000004 (2 s , n = 2), respectively. The 143 Nd/ 144 Nd ratios via solution‐MC‐ICP‐MS and LA‐ICP‐MS all agree within uncertainty and suggest that both titanites can be used as RMs for Nd‐isotope analyses.
Publisher: Copernicus GmbH
Date: 23-03-2020
DOI: 10.5194/EGUSPHERE-EGU2020-11835
Abstract: & & Subduction initiation is commonly identified as a major enigma in plate tectonics. Attention to subduction initiation is growing in the community, as is our understanding of the sequences of geologic events that precede and postdate this critical stage of the Wilson cycle. Nevertheless, the direct triggers of subduction initiation and their regional to global consequences remain uncertain. The New Caledonia ophiolite has formed in a supra-subduction zone setting in the vicinity of an active spreading centre. The metamorphic sole, which represents the ancient subduction interface, is locally preserved beneath the ophiolite. Unravelling its tectono-metamorphic record is essential in order to determine the timing of subduction initiation and the tectonic processes operating at the plate interface during the early stages of subduction.& We have s led and studied hibole-bearing rocks of the metamorphic sole that crop out in three newly found and three previously known localities that are scattered across the island (160 km * 50 km in size). The hibolites form laterally discontinuous meter-size lenses that crop out within or beneath the serpentinite sole at the base of the ophiolite nappe.& Preliminary U-Pb zircon ID-TIMS geochronology yields a crystallization age of 56& #177 Ma in agreement, but with a narrower timespan compared to previously published data (Cluzel et al., 2012).& We use whole-rock geochemistry, mineral chemistry and thermodynamic modelling to constrain the Pressure-Temperature-time history of the hibolites.& Microstructural data such as dominant deformation mechanisms, crystallographic preferred orientations, grain size distributions determined by EBSD allow to constrain the deformation processes and rheological behavior of the hibolites during subduction infancy.& & & & & & & & & Cluzel, D., Jourdan, F., Meffre, S., Maurizot, P., and Lesimple, S., 2012. The metamorphic sole of New Caledonia ophiolite: 40Ar/39Ar, U-Pb, and geochemical evidence for subduction inception& at a spreading ridge. Tectonics, VOL. 31, TC3016, doi:10.1029/2011TC003085.& &
Publisher: Elsevier BV
Date: 04-2013
Publisher: Wiley
Date: 08-08-2013
Publisher: Springer Science and Business Media LLC
Date: 05-09-2013
No related grants have been discovered for Fernando Corfu.