Figure 3
A serie of photomicrographs showing the distribution, shape and interrelationships with host minerals and other inclusions of primary type 2 fluid inclusions. (A): Comparatively large type 1 and type 2b fluid inclusion coexisting in the same zoisite crystal (sample Dior-2). The type 2b inclusion is isolated. Two smaller type 1 inclusions are present near the lower left part of the one indicated by a black arrow, which together form a small group. (B): Rod-shaped fluid inclusions in a diopside crystal (sample Dior-1). The inclusions are randomly distributed and are oriented parallel to the c axis of the crystal. (C): Image showing acicular inclusions in grossular (Gr) from sample Gran-1b. Some of the inclusions consist of diopside needles and others are fluid filled. The occurrence of these inclusions is restricted to certain sectors within larger grossular crystals (black arrow). Type 2a fluid inclusions in grossular most commonly occur in these acicular clusters. Coarse-grained diopside crystals (Di) are abundant in the grossular and contain the same type of fluid inclusions. (D): Detail of an elongated type 2a fluid inclusion in grossular from sample Gran-1b. (E): Image showing diopside filling interstices between euhedral grossular crystals in veins from sample Slate-1a. A type 2a fluid inclusion in the diopside is shown by a black arrow. The grossular also contain type 2a fluid inclusions. Type 2a fluid inclusions in samples Slate-1a and Gran-1b showed the same behaviour during cryogenic experiments. (F): A type 1c fluid inclusion (black arrow) in vesuvianite sample Ves-2. This inclusion is oriented parallel to the c axis of the host crystal. Other needle-shaped inclusions can be seen oriented in the same way. They consist mostly of empty cavities.