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LancangriftwhichliesinthcBao-LangcodomesystemofthcwesternYunandiwaregionisaNS-trending,latePalacozoicriftonthcancientland’smargin.ItswestandcastsidesarerisingblockscomposcdofthcLancangformationaIldXimcngforn1ationofmetamorphicrocks,andbclongtogcosyn-cline