I would like to ask for insights regarding the image I uploaded. The background is a scanned cross-polarized light (XPL) photomosaic of a thin section, with cathodoluminescence (CL) images of selected regions overlaid for comparison.
The dark layers are composed of rhythmically laminated dolomitic mudstone, consisting of alternating fine-grained dolomitic and dark mud-rich laminae. In contrast, the light-colored layer shows high-order white interference colors under cross-polarized light and was initially interpreted as dolomite. However, this layer is non-luminescent under CL imaging and shows no response to alizarin red S staining. Elemental mapping (EDS) reveals high Si content and relatively low Mg content. Additionally, this light-colored layer frequently contains scattered microcrystalline quartz aggregates.
The sample is from a Permian alkaline lake system that was strongly influenced by volcanic and hydrothermal activity. The sediments in this interval commonly contain minerals such as shortite, eitelite (Na₂Mg(CO₃)₂), and gaylussite (Na₂Ca(CO₃)₂·5H₂O).
Questions:
Any ideas, references, or similar case studies would be greatly appreciated. Thank you in advance!
My thesis was like your project. Quartz microcristaline in the cambrian dolomites. I research about metamorphic minerals into that.
The regularity of the arrangement of the stripes and their shape indicates that they were created by a machine element.
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