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Intergrowth of graphite within phlogopite from Finero ultramafic complex (Italian Western Alps)

¹ Centre for Advanced Research for Ecomaterials, Institute of Environmental Science Engineering, Nanyang Technological University, Innovation Centre Blk. 2, Singapore 637723
² Institute of Mineralogy and Petrography, University of Fribourg, CH-1700 Fribourg, Switzerland
³ Institute für Mineralogie und Petrographie, ETH, Zurich, Switzerland
⁴ Swiss Federal Institute of Technology, ETH Hönggerberg, Zurich, Switzerland

^* Corresponding autor, e-mail: cferraris{at}ntu.edu.sg

High Resolution Transmission and Analytical Electron Microscopy (HRTEM-AEM) of phlogopite crystals from the Finero lherzolite (Italian Western Alps) revealed nanometric intergrowths of graphite-like layers. The intergrowths consist of 4 to 6 graphite-like layers (c 3.3 Å) with the basal plane parallel to (001) of the phlogopite host. The phlogopite crystals contain between 0.024 and 0.048 wt % of carbon. The carbon isotope composition varies from ¹³C_graphite = –16.1 %° to –10.4 %° (VPDB). These values are compatible with carbon phases found in other mantle-derived ultramafic rocks. A Raman analysis confirms the presence of a graphite-like phase intergrown within phlogopite. Geochemical and microtextural data point to a primary origin of the phlogopite-graphite intergrowths and suggest simultaneous crystallization of both phases from a trapped partial melt.

Key-words: phlogopite, graphite, HRTEM-AEM, intergrowth, Finero peridotite.

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