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词条 Megacryst
释义

  1. See also

  2. References

  3. Notes

In geology, a megacryst is a crystal or grain that is considerably larger than the encircling matrix. They are found in igneous and metamorphic rocks.[1] Megacrysts can be further classified based on the nature of their origin, either as:[2]

  • Phenocrysts, which crystallize in molten rock material (lava or magma) and are hence an earlier crystallization than the matrix in which they are embedded
  • Porphyroblasts, which develop in solid rock as the result of metamorphism or metasomatism

See also

  • Xenolith, an inclusion of one rock type in another

References

1. ^{{cite web|url=http://www.memphisgeology.org/glossary_ln.htm|title=Glossary of terms|accessdate=29 December 2009|publisher=Memphis Archaeological and Geological Society|date=7 April 2006}}
2. ^Chapman, Carleton A. (2014). Phenocryst. In AccessScience. McGraw-Hill Education. https://doi.org/10.1036/1097-8542.506500

Notes

  • Significance of k-feldspar megacryst size and distribution in the tuolumne intrusive suite, California
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1 : Petrology

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