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E-mount granite Pluton is located at the southwest part of Yangtze plate. To understand the formation environment of K-feldspar porphyritic granite from E-Mount, approaches such as major and trace element analysis and zircon LAICP-MS U-Pb dating are used. According to the tests and analysis results, Geochemical shows major elements of w(SiO2) 64.7%~77.41% (> 67%), and A/CNK 0.889~1.234. The zircon age of K-feldspar porphyritic granite is 838.8±6Ma. Finally, infer the forming environment of K-feldspar porphyritic granite that magmatic activity should have been started since 838 Ma, related to postcollisional lithospheric delamination and upwelling of hot asthenosphere, and the tectonic environment of depressurization and warming. Keywords-component; formation environment; K-feldspar; granite; E-Mount; LAICP-MS U-Pb

The Formation Environment of K-feldspar Porphyritic Granite from E-Mount, Yunnan