Mesozone
The mesozone ( Greek : μέσος (meso-) "middle" and ζώνη zōnē "belt") is an outdated term in geology and petrology for a facies of rock metamorphosis .
It covers the area of regional metamorphosis with temperatures between 300 and 700 ° C as well as mean all-round pressures and is the middle stage of the 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, among others, is characteristic of the meso zone, which can form depending on the original rock due to the pressure and temperature conditions:
The rocks of the mesozone include mica schist , quartzite , amphibole and marble . The effects of the mesozonal metamorphosis are clearly noticeable in most cases due to the increased formation of new minerals.
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. The individual steps are the zeolite - prehnite - Pumpellyite - Blauschiefer - greenschist - amphibolite - granulite - and eclogite -Fazies. The blue schist, green schist and amphibolite facies roughly correspond to the mesozone.
See also
Individual evidence
- ^ Hans Murawski, Wilhelm Meyer: Geological dictionary . 11th edition. Elsevier / Spektrum, Heidelberg 2004, ISBN 3-8274-1445-8 , pp. 262 .
- ↑ 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
- ^ 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)
