Melt Connectivity and Its Effect on Grain Growth in Natural Olivine Aggregates: An Experimental Study

Abstract : To better constrain the rheology of the mantle, experimental studies on olivine grain growth have been conducted (Faul and Scott, 2006; Karato, 1989; Nichols and Mackwell, 1991) since the grain size is an important parameter under dynamic regimes (e.g. diffusion creep and grain boundary sliding). In order to better define the melt effect on the rheological response of a partially molten olivine aggregate, we have experimentally investigated the effect of melt on olivine grain growth and the connectivity of this melt phase. Experiments were performed in 3/4” piston cylinders at 500 MPa confining pressure, different temperatures (i.e. 1100°C, 1250°C and 1400°C) and four durations (1h, 12h, 72h and 15 days). Starting material was composed of natural San Carlos olivine (5 μm
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Conference papers
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  • HAL Id : insu-01163371, version 1

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Emmanuel Gardès, Emmanuel Le Trong, Fabrice Gaillard. Melt Connectivity and Its Effect on Grain Growth in Natural Olivine Aggregates: An Experimental Study. AGU Fall Meeting, AGU, Dec 2014, San-Francisco, United States. ⟨insu-01163371⟩

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