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Paper Information

Title: 

CALCITE TWIN WIDTH AND INTENSITIES AS METAMORPHIC INDICATORS IN MARBLES OF TOUTAK METAMORPHIC COMPLEX

Type: PAPER
Author(s): SARKARINEZHAD KH.,KOLAHI AZAR A.P.,SAMANI B.
 
 
 
Name of Seminar: GEOLOGICAL CONGRESS
Type of Seminar:  CONGRESS
Sponsor:  IRANIAN GEOLOGICAL SOCIETY
Date:  2005Volume 9
 
 
Abstract: 

Twins in marbles of Toutak metamorphic complex show a direct relationship of twin width and intensity (number of twin per mm). The transition from dominant thin twinning to dominant thick twinning occurs at temperature between 150oC and 200oC. Below the transition temperature, increasing strain is apparently accommodated by adding new twins, and above the transition temperature strain is accommodated by twin widening. Similar phenomenon was also studied in the Helvetic Alps, the prealps and the central Appalachian. These data for deformed marbles support the interpretation from experimental studies of a temperature effect on twin width and intensity and indicate that the twinning in marbles of Toutak complex occurred at peak metamorphism.

 
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