Research Article

Isotopic Age of the Xiong’er Group Volcanic Rocks and Its Geological Significance in Western Henan, China

Figure 3

Field and micrographs of the Jidanping Formation in the Xiong’er Group. (a) Field surface outcrop of dacite. (b) Dacite outcrop in Jiuzhanggou gold mine. (c) Micrograph of dacite. (d) Feldspar phenocryst of dacite.
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