Trachybasalt

Source: Wikipedia, the free encyclopedia.
Potassic trachybasalt from the July–August 2001 eruption of Mount Etna, Italy
epoch[1]

Trachybasalt is a

clinopyroxene and likely very small amounts of leucite or analcime.[2]

Description

TAS diagram
highlighting the trachybasalt field

An

wt% Na2O > K2O + 2 for hawaiite.[3][4][5] The intrusive equivalent of trachybasalt is monzonite.[6]

Trachybasalt is not defined on the

U.S. Geological Survey defines trachybasalt as a mafic volcanic rock (composed of over 35% mafic minerals) in which the quartz-feldspar-feldspathoid fraction of the rock is less than 20% quartz and less than 10% feldspathoid, and in which plagioclase is between 65% and 90% of the total feldspar content.[7]

Occurrence

Trachybasalt is common in continental volcanism and is also found on some ocean islands.

Gale crater on the planet Mars.[11]

References

  1. ^ "Bayuda Volcanic Field". Global Volcanism Program – Volcanoes of the World database. Smithsonian Institution. 5 June 2020. Retrieved 6 August 2020.
  2. ^ Trachybasalt
  3. ^
    S2CID 28548230
    .
  4. ^ a b "Rock Classification Scheme - Vol 1 - Igneous" (PDF). British Geological Survey: Rock Classification Scheme. 1: 1–52. 1999.
  5. ^
    ISBN 9780521880060
    .
  6. doi:10.3390/geosciences9010042
    .
  7. ^ "Geologic units containing Trachybasalt". U.S. Geological Survey. Retrieved 3 June 2022.
  8. ISBN 9780199653065
    .
  9. doi:10.1127/0935-1221/2008/0020-1841
    .
  10. ^ Goff, Fraser; Kelley, Shari A.; Goff, Cathy J.; McCraw, David J.; Osburn, G. Robert; Lawrence, John R.; Drakos, Paul G.; Skotnicki, Steven J. (2019). "Geologic map of the Mount Taylor volcano area, New Mexico". New Mexico Bureau of Geology and Mineral Resources Geologic Map. 80.
  11. hdl:2381/40838
    .
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