Katazone

The Katazone ( Greek : κατα- (kata-) "completely, from ... down" and ζώνη (zōnē) "belt") is an outdated term in geology and petrology for a facies of rock metamorphosis . It encompasses the area of regional metamorphosis with temperatures above 700 ° C and high all-round pressures and is the most advanced stage of rock transformation. The term is still used today in those cases in which no more precise statements can be made about the educational conditions.

The new formation of the following minerals is characteristic of the Katazone, which can be formed depending on the original rock due to the pressure and temperature conditions:

• Feldspars
• Biotite
• garnet
• Sillimanite

The rocks of the Katazone include gneiss , granulite , Hälleflinta , leptite , calcium silicate rock and graphite . Many of the original rock has been transformed so much that it is barely recognizable or not at all.

The stage of metamorphosis achieved in a rock is described today with the metamorphic facies developed by Pentti Eskola . In this facies, the appearance of characteristic minerals reflects a narrowly limited pressure and temperature range. Individual steps include the zeolite - prehnite - Pumpellyite - Blauschiefer - greenschist - amphibolite - granulite - and eclogite -Fazies. The amphibolite, granulite and eclogite facies roughly correspond to the katazone.

See also

• Epizone
• Mesozone

Individual evidence

1. ^ Hans Murawski, Wilhelm Meyer: Geological dictionary . 11th edition. Elsevier / Spektrum, Heidelberg 2004, ISBN 3-8274-1445-8 , pp. 262 .
2. ↑ ^{a b} Metamorphites. ( Memento of the original from September 17, 2008 in the Internet Archive ) Info: The archive link was inserted automatically and has not yet been checked. Please check the original and archive link according to the instructions and then remove this notice. Rock science at RWTH Aachen 
3. ^ Metamorphism and Metamorphic Rocks. ( Memento of the original from June 22, 2008 in the Internet Archive ) Info: The archive link was inserted automatically and has not yet been checked. Please check the original and archive link according to the instructions and then remove this notice. University of Alabama, Department of Geological Sciences (English)