Figure 1
a) Geological map of the central-northern portion of State of Rondônia, highlighting the granitic systems that make up the Rondônia Tin Province (modified from CPRM, 2007SERVIÇO GEOLÓGICO DO BRASIL. Geologia e recursos minerais do estado de Rondônia: Sistema de Informações Geográficas - SIG: texto explicativo do mapa geológico e de recursos minerais do estado de Rondônia - Escala 1:1.000.000. Porto Velho: CPRM, 2007. 153p. 1 CD-ROM. ); b) Geological map of the Massagana polyphasic batholith (Debowski, 2016).
Figure 2
a) Contact zone between tabular zoned pegmatite body and Jamari Complex wall-rocks; b) Euhedral short to long aquamarine crystals within granitic pegmatite, showing concentric growth zones and irregular coloration; c) photomicrography of a concentrically zoned aquamarine crystal. Note several micro-inclusions distributed mainly along the growth lines, as well as a set of electron-microprobe analyses along a crystal profile from edge to core (P// = parallel polars); d) Weight percent data for some selected oxides in aquamarine along a traverse. Note the tendency for positive correlation between Fe2O3total and Na2O; e) Cationic correlation between Fetotal + Mg vs Na (in apfu); and F) Cationic correlation between Al3+vs sum of Fetotal + (Mg, Ti, Cr, Mn) (in apfu).
Figure 3
Morphological features of main aqueous fluid inclusion types identified in the aquamarine crystals. a) and b) Morphological variation from type 1a aqueous fluid inclusions. Note in b, the type 1a sub-rounded shape and hosting an opaque micro-crystal (solid phase); c) Type 1B with cylindrical shape often found parallel to the c-axis; d) Type 3 fluid inclusion with sub-rounded to elliptical shape; e) Frequency histogram of total homogeneization temperatures (Thtot) of aqueous fluid inclusions at aquamarine (types 1a and 1b); and f) Total homogeneization temperatures vs salinity diagram applied to fluid inclusions data obtained in aquamarine. For a simple comparative analysis on the fluid inclusion data in gems from Massangana pegmatites available in literature.