File:Photomicrograph-porphyritic-aphanitic-felsic-rock-USGS.jpg
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Photomicrograph-porphyritic-aphanitic-felsic-rock-USGS.jpg (400 × 267像素,文件大小:31 KB,MIME类型:image/jpeg)
Photomicrograph-porphyritic-aphanitic-felsic-rock-USGS.jpg (400 × 267像素,文件大小:31 KB,MIME类型:image/jpeg)
描述Photomicrograph-porphyritic-aphanitic-felsic-rock-USGS.jpg |
English: Photomicrograph of a porphyritic-aphanitic felsic rock. Plagioclase phenocrysts (white) and hornblende phenocryst (dark; intergrown with plagioclase) are set in a fine matrix of plagioclase laths that show flow structure. Plain polarized light; length of photo is 2.6 mm. "Most felsic rocks are porphyritic with phenocrysts that include plagioclase (most common), biotite, hornblende, orthopyroxene (rare), and orthoclase (rare) (fig. 4)." Middle Eocene Igneous Rocks in the Valley and
Ridge of Virginia and West Virginia |
日期 | |
来源 | Figure 4, Trip 4, Geology of the National Capital Region—Field Trip Guidebook, Circular 1264, (2004) Department of the Interior, U.S. Geological Survey http://pubs.usgs.gov/circ/2004/1264/html/trip4/fig4.html |
作者 | United States Geological Survey |
Public domainPublic domainfalsefalse |
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当前 | 2013年12月13日 (五) 03:10 | ![]() | 400 × 267(31 KB) | Bejnar(留言 | 贡献) | User created page with UploadWizard |
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