Fig. 5: Ductile transposition and folding of early magnesite veins.
From: Ductile deformation during carbonation of serpentinized peridotite
a folded magnesite veins, the matrix consists of quartz and aligned magnesite dendrites (crossed polarized light with 1λ-plate; BT1B_21-3_35-40). b Optical cathodoluminescence image of the same area as in a, showing pink luminescent magnesite overgrowth on folded veins (arrows). In the lower right domain listvenite resembles a mesh texture and veins are not folded. c Back-scattered electron (BSE) image of transposed magnesite vein with magnesite dendrites growing oblique to the foliation in the opening space (red arrow). In this image, the contrast was enhanced and oxides are rendered black (BT1B_20-1_64-68). d BSE image of folded magnesite vein, with euhedral magnesite overgrowths on the vein rims (yellow arrows) (BT1B_16-3_28-31). e Electron backscatter diffraction (EBSD) orientation map of magnesite of the same area as in d (ipf color scale see inset), with average orientation of magnesite [001] in different vein parts and of quartz (Qtz) [001] in the matrix indicated (c.f. Figure 4). In a and d, dotted lines mark the trace of the fold axial surfaces and the parallel shape preferred orientation of dendritic magnesite. Scale bar in a and b is 400 µm, in c–e 200 µm.
