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• W2007286598 startingPage "1273" @default.
• W2007286598 abstract "Within the undisrupted, 6 km thick mantle section of the Table Mountain massif (Bay of Islands ophiolite, Newfoundland), several distinct peridotite microstructures are recognized. In the uppermost mantle section, very high temperature (T ∼ 1200°), high strain microstructures with evidence for syntectonic melt infiltration are preserved. Remarkable among these is an orthopyroxene-impregnated dunite. At an intermediate level of the mantle section, peridotites have been affected by a weak, lower temperature (T = 1000–1100°C) overprint. They are underlain by a thin sliver of low strain, high temperature peridotites. All these peridotites are interpreted to have formed during spreading-related strain. Lower temperature (T < 1000°C), high stress microstructures with high accumulated strain are locally preserved at intermediate levels of the mantle section and are regionally present at its base. They culminate in (metasomatic) ultramafic ultramylonites and are related to detachment of the ophiolite. With the exception of the basal ultramylonitic peridotites, the activated olivine slip system was (0kl)[100]. In the highest temperature peridotites, a weak preference for the activation of distinct slip planes ((010),(001),(011)) was noted. Based on piezometry and olivine flow laws, strain rate estimates for the basal detachment fabrics are 10−12 s−1. This strain rate is consistent with the observed width of detachment overprint in the ophiolite and reasonable plate tectonic convergence rates. Strain rate estimates for the very high temperature peridotites are even higher. Recent data about grain growth rates in olivine indicate that, in order to preserve the peridotite microstructures, olivine grain growth must have been highly impeded. Olivine flow law data suggest that even peridotites with lower temperature microstructures (T ≥ 900–950°C) could form within the rheological asthenosphere. The detachment or spreading-related origin of peridotites with a lower temperature overprint may thus only be concluded from the regional geological context." @default.
• W2007286598 created "2016-06-24" @default.
• W2007286598 creator A5089544871 @default.
• W2007286598 date "1993-11-01" @default.
• W2007286598 modified "2023-09-28" @default.
• W2007286598 title "Evaluation of upper mantle microstructures in the Table Mountain massif (Bay of Islands ophiolite)" @default.
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• W2007286598 doi "https://doi.org/10.1016/0191-8141(93)90102-g" @default.
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