Xav & Jul
Français

Back to Geoloweb.ch

Print...

Photos - serie 1

Coloured figures from Allaz, Maeder, Vannay & Steck 2005

Back to download page ... See more figures (unpublished)...

To see or download each files separately:
..........a) normal clic on a link to see picture or
..........b) right clic (or "ctrl" + clic on mac) and "save target as..." to save file on hard drive
In figure captions: AbQ = Aluminosilicate-bearing quartz vein, And = andalusite, Bt = biotite, Ilm = ilmenite, Ky = kyanite, Ms = muscovite, Pl = plagioclase, Qtz = quartz, St = staurolite
Fig. 6 (a) AbQ vein in micaschist. The vein (D3) cut the main schistosity S2 (536 ko) Fig. 6 (b) [left-fig.] [right-fig.] AbQ vein in the boudin neck of an older Qtz vein, and showing horizontal N-S extension. Aluminosilicates are in the center part (enlarged in figure on the right, with a 15 cm-long pen), accompanied by Pl, Qtz and micas. Hammer is 60 cm long (600 and 613 ko).
Fig. 6 (c) AbQ vein with Ky porphyroblasts oriented parallel to the penetrative schistosity and N-S oriented mineral lineation observed in the host rock (39 ko) Fig. 6 (d) AbQ vein with fan-shaped Ky and And. Note the border zone of the vein formed by Bt and Pl (230 ko) Fig. 6 (g) Large Ky rod (cm-sized), partially retrogressed into And, enclosed in a Qtz and Pl aggregate (297 ko)
Fig. 6 (e) and Fig. 6 (f) Crossed-polarised microphotograph of And porphyroblasts containing inclusions of randomly oriented and partially resorbed prismatic Ky (left figure). This textural relation indicates And growth at the expense of Ky by a polymorphic reaction. Ky inclusions are sometimes deformed, which is never the case for And (395 and 190 ko)
Fig. 6 (h) [left: Polarised light] [right: Polarised+Analyzed light] Microphotographs of the core of an AbQ vein, with sheaf-like Ms in equilibrium with the non-oriented Ky grains (457 and 359 ko)
Fig. 6 (i) [left: from publication] [right: larger view] Plane-polarized microphotograph of the core of an AbQ vein composed of St, Ky, Qtz, Ms, ± Ilm (571 and 498 ko) Fig. 7 (a) Distribution map of Mg for a cm-sized And crystal with Ky inclusions (627 ko)

More figures ("BONUS", not published) available here!

Photo - serie 2

Uni Lausanne || Geology 2003-2005 © Xavier Maeder & Julien Allaz Created: 10th May 2003
Last update: 28th December 2023