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The discovery of the chromian spinel detritus in sandstones from the Permian Nam Duk Formation (Phetchabun region) confirms that the siliciclastic part of this formation is related to the erosion of a mountain belt caused by compressional deformation. The question discussed is whether this detritus is derived from an older orogen exposed today in the region of Loei east of the Nam Duk Basin, or it...
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