The Pre-Sinian Darezha Formation is widely exposed in west Mianning.
冕宁西部是康滇地区前震旦系出露较集中的地段之一。
The opening and closing history may involve three major stages: pre-Sinian, Paleozoic and Meso-Cenozoic.
开合历史分为前震旦纪、古生代和中、新生代三大阶段。
Based on analysis of auriferous and geochemical properties of the meta morphic rocks, the authors hold that the major elements related to gold mineralization were derived from the Pre-Sinian System.
在分析变质岩的含金性及地球化学性质的基础上，认为与金成矿有关的主要元素均源自前震旦系。
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