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Figure 10 | Geochemical Transactions

Figure 10

From: Physicochemical conditions and timing of rodingite formation: evidence from rodingite-hosted fluid inclusions in the JM Asbestos mine, Asbestos, Québec

Figure 10

Pressure-temperature diagram showing the calculated trapping conditions of the fluid inclusions in rodingites from the JM Asbestos mine and superimposed pressure-temperature-time (P-T-t) paths estimated by Whitehead et al. [59] for the footwall at the base of the Thetford-Mines ophiolite (dashed lines). Only the paths that cross the P-T conditions determined by Clague et al. [65] and Feininger [66] for the metamorphism in the footwall at the base of the Thetford-Mines ophiolite are reproduced. The P-T-t paths define a range of geotherms that transect the calculated trapping conditions of type 2b fluid inclusions in rodingitized diorite. Trapping conditions for type 2a fluid inclusions in samples Gran-1b and Slate-1a, and for two type 1 fluid inclusions in vesuvianite (isochore indicated by solid line labelled 'Ves'), lie below those geotherms. The diagram also show the limits of stability of forsterite and antigorite in the system MgO-SiO2-H2O, and prehnite, in part, calculated using THERMOCALC v2.3 [42,43] assuming pure phases. The wet pelite solidus is after Thompson and Algor [67] and the limit for the stability of andalusite after Richardson et al. [68]. The diagram suggests emplacement of andalusite granites at relatively shallow levels in the Asbestos ophiolite, and possibly through peridotites that were already serpentinized.

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