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1 See also  





2 References  














Latite






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From Wikipedia, the free encyclopedia
 


Latite
Volcanic rock
Photomicrographofthin section of latite (in plane polarised light)
Photomicrographofthin section of latite (in cross polarised light)

Latite is an igneous, volcanic rock, with aphanitic-aphyric to aphyric-porphyritic texture. It is the volcanic equivalent of monzonite. Its mineral assemblage is usually alkali feldspar and plagioclase in approximately equal amounts. Quartz is less than five percent and is absent in a feldspathoid-bearing latite, and olivine is absent in a quartz-bearing latite. When quartz content is greater than five percent the rock is classified as quartz latite.[1] Biotite, hornblende, pyroxene and scarce olivineorquartz are common accessory minerals. Feldspathoid-bearing latite is sometimes referred to as tristanite.[2]

Rhomb porphyries are an unusual variety with gray-white porphyritic rhomb shaped phenocrysts embedded in a very fine grained red-brown matrix. The composition of rhomb porphyry places it in the trachyte - latite classification of the QAPF diagram.

Latite is found, for example, as lavas in Bulgaria[3] and as intrusive laccoliths and sillsinSouth Dakota, USA.[4]

See also[edit]

References[edit]

  • ^ Philpotts, Anthony R.; Ague, Jay J. (2009). Principles of igneous and metamorphic petrology (2nd ed.). Cambridge University Press. p. 140-141. ISBN 9780521880060.
  • ^ Georgiev, V.; Milovanov, P. (2001). "Volcanism in the Momchilgrad Volcanotectonic Depression". Comptes rendus de l'Académie bulgare des Sciences. 54 (3): 63–66. Bibcode:2001CRABS..54c..63G. Retrieved on 5 July 2015.
  • ^ "Latitic Intrusive Rocks". USGS. Retrieved 5 July 2015.
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    This page was last edited on 8 July 2024, at 19:29 (UTC).

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