The Geology of Minnesota volume 5
The Geology of Minnesota volume 5
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In our eReader you can find the full English version of the book. Read The Geology of Minnesota volume 5 Online - link to read the book on full screen. Our eReader also allows you to upload and read Pdf, Txt, ePub and fb2 books. In the Mini eReder on the page below you can quickly view all pages of the book - Read Book The Geology of Minnesota volume 5
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Meg. A rock composed of numerous gray to flesh-colored porphyritic feldspars and a very dark gray, almost aphanitic groundmass.
Mic. Considerably altered porphyritic plagioclases are seen in an altered groundmass composed largely of feldspars, many of which are lath-shaped in form. Besides the feldspar there are magnetite, hematite, quartz and green alteration products (mostly chlorite). There are also a few opaque grains, flesh-colored in reflected light, which are perhaps the alteration produ...cts of ilmenite. Some of the chlorite areas, by their relation to the lath-shaped feldspars, suggest altered ophitic augites. There are also some areas of chlorite which may represent altered olivines.
One section examined.
Age. Cabotian or Manitou. U. S. G.
PETROGRAPHIC GEOLOGY AND DESCRIPTIONS. 479 Diabase. ] No. 664. DIABASE. (Coarse. } "A little more than two miles from Horseshoe bay (north shore of lake Superior). " Evidently from McParland's trail, and probably near the southwest corner of sec.
What to read after The Geology of Minnesota volume 5?
You can find similar books in the "Read Also" column, or choose other free books by Geological And Natural History Survey of Minnesota to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
Meg. A rock composed of numerous gray to flesh-colored porphyritic feldspars and a very dark gray, almost aphanitic groundmass.
Mic. Considerably altered porphyritic plagioclases are seen in an altered groundmass composed largely of feldspars, many of which are lath-shaped in form. Besides the feldspar there are magnetite, hematite, quartz and green alteration products (mostly chlorite). There are also a few opaque grains, flesh-colored in reflected light, which are perhaps the alteration produ...cts of ilmenite. Some of the chlorite areas, by their relation to the lath-shaped feldspars, suggest altered ophitic augites. There are also some areas of chlorite which may represent altered olivines.
One section examined.
Age. Cabotian or Manitou. U. S. G.
PETROGRAPHIC GEOLOGY AND DESCRIPTIONS. 479 Diabase. ] No. 664. DIABASE. (Coarse. } "A little more than two miles from Horseshoe bay (north shore of lake Superior). " Evidently from McParland's trail, and probably near the southwest corner of sec.
What to read after The Geology of Minnesota volume 5?
You can find similar books in the "Read Also" column, or choose other free books by Geological And Natural History Survey of Minnesota to read onlineMoreLess
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