Whiteschist

A whiteschist is an uncommon metamorphic rock formed at high to ultra-high pressures. It has the characteristic mineral assemblage of kyanite + talc, responsible for its white colour. The name was introduced in 1973 by German mineralogist and petrologist Werner Schreyer.[1] This rock is associated with the metamorphism of some pelites, evaporite sequences or altered basaltic or felsic intrusions.[2][3][4] Whiteschists form in the MgO–Fe
2O
3–Al
2O
3–SiO
2–H
2O (MFASH) system.[5] Rocks of this primary chemistry are extremely uncommon and they are in most cases thought to be the result of metasomatic alteration, with the removal of various mobile elements.[3]

  1. ^ Schreyer, W. (1973). "Whiteschist: a high-pressure rock and its geologic significance". The Journal of Geology. 81 (6): 735–739. Bibcode:1973JG.....81..735S. doi:10.1086/627926. JSTOR 30059001. S2CID 128944616.
  2. ^ Schreyer, W.; Abraham K. (1976). "Three-Stage Metamorphic History of a Whiteschist from Sar e Sang, Afghanistan, as Part of a Former Evaporite Deposit". Contributions to Mineralogy and Petrology. 59 (2). Springer-Verlag: 111–130. Bibcode:1976CoMP...59..111S. doi:10.1007/BF00371302. S2CID 129384880.
  3. ^ a b Cite error: The named reference Johnson was invoked but never defined (see the help page).
  4. ^ Rolfo, F.; Compagnoni R.; Xu S.; Jiang L. (2000). "First report of felsic whiteschist in the ultrahigh-pressure metamorphic belt of Dabie Shan, China". European Journal of Mineralogy. 12 (4): 883–898. doi:10.1127/0935-1221/2000/0012-0883. Retrieved 21 December 2011.
  5. ^ Wyllie, P.J. (1992). "Experimental petrology: Earth materials science". In Brown G., Hawkesworth C. & Wilson C. (ed.). Understanding the Earth (2 ed.). Cambridge University Press. pp. 82–84. ISBN 978-0-521-42740-1. Retrieved 21 December 2011.