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Interlayer and Si content of phengite in HP–LT carpholite‐bearing metapelites by P. Agard; O. Vidal; B. Goffé is a Earth and Planetary Sciences article available to read on EtoBox.

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## Abstract Phengite occurring along with carpholite±lawsonite and/or chloritoid in HP–LT domains shows not only variable Si–(Mg+Fe) contents, but also variable interlayer contents (IC). To determine whether these chemical variations are coherently related to variation in __P–T__ conditions on a regional scale, __c__. 100 rock samples were sampled in metapelites metamorphosed at conditions varying from 350 °C, 8 to 12 kbar to 450–500 °C, 18 to 20 kbar (Schistes Lustrés complex, franco‐italian Western Alps). Based on microstructural and habit criteria, four types of phengite were differentiated that are related either to the rock mineralogy (carpholite vs chloritoid bearing samples) or correspond to various generations of phengite occurring in the same rock sample or thin section. Microprobe analyses reveal that each type of phengite is characterized by a specific composition and that phengite associated with carpholite has a lower interlayer content than phengite associated with chloritoid. The successive generations of retrograde phengite overgrowing carpholite point to a large decrease of interlayer content (__c__. 0.9–0.7 pfu) and (Fe+Mg) content (__c__. 0.25–0 pfu) with decreas

Who reads Interlayer and Si content of phengite in HP–LT carpholite‐bearing metapelites?

Author

P. Agard; O. Vidal; B. Goffé

Publisher

John Wiley and Sons; Wiley (Blackwell Publishing); Blackwell Publishing Inc.; Wiley; University of California Press (ISSN 0263-4929)

Published

2001

Language

EN

Field

Earth and Planetary Sciences (Physical Sciences)