The Fundamental Principles of Petrology
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In our eReader you can find the full English version of the book. Read The Fundamental Principles of Petrology 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 Fundamental Principles of Petrology
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Further, the plagioclase, which appears perfectly fresh and transparent in thin sections, is filled with sharply-formed, unoriented microlites of clinozoisite, garnet, muscovite, and sillimanite, in some cases so abundant that a thick section of the mineral appears dull and opaque. Where the rock has a distinct parallel texture, these minerals, as well as the mica, occur in parallel layers. In many cases the feldspar crystals, plagio- clase as well as orthoclase, were fractured but later reunit...ed by a cement of quartz and feldspar upon the final crystallization of the mother-liquor. Lastly, the quartz has a typical cataclastic texture, indicating the stresses through which it passed. The original texture was naturally made indistinct by all these subsequent changes, so that phenocrysts of feldspar, where found, do not have the sharply-defined outlines and haphazard arrangement which they have in normal porphyritic granite, but lie with their flat sides parallel to the schistosity of the rock and occur in lenses, usually fine-granular at the borders.
What to read after The Fundamental Principles of Petrology?
You can find similar books in the "Read Also" column, or choose other free books by Ernst Weinschenk to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
Further, the plagioclase, which appears perfectly fresh and transparent in thin sections, is filled with sharply-formed, unoriented microlites of clinozoisite, garnet, muscovite, and sillimanite, in some cases so abundant that a thick section of the mineral appears dull and opaque. Where the rock has a distinct parallel texture, these minerals, as well as the mica, occur in parallel layers. In many cases the feldspar crystals, plagio- clase as well as orthoclase, were fractured but later reunit...ed by a cement of quartz and feldspar upon the final crystallization of the mother-liquor. Lastly, the quartz has a typical cataclastic texture, indicating the stresses through which it passed. The original texture was naturally made indistinct by all these subsequent changes, so that phenocrysts of feldspar, where found, do not have the sharply-defined outlines and haphazard arrangement which they have in normal porphyritic granite, but lie with their flat sides parallel to the schistosity of the rock and occur in lenses, usually fine-granular at the borders.
What to read after The Fundamental Principles of Petrology?
You can find similar books in the "Read Also" column, or choose other free books by Ernst Weinschenk to read onlineMoreLess
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