Paper Information

Journal:   JOURNAL OF SCIENCE (UNIVERSITY OF TEHRAN) (JSUT)   SPRING 2007 , Volume 33 , Number 1 (SECTION: GEOLOGY); Page(s) 39 To 47.
 
Paper: 

PETROGRAPHY OF HIGH TEMPERATURE DEFORMATION IN MARGINAL PARTS OF THE LAKHSHAK GRANITOID INTRUSION, NW OF ZAHEDAN, IRAN

 
 
Author(s):  KANANIAN A.*, REZAEI KAHKHAEI M., ELIASI M., ESMAEILI DARYOUSH
 
* SCHOOL OF GEOLOGY, UNIVERSITY COLLEGE OF SCIENCE, UNIVERSITY OF TEHRAN, TEHRAN, IRAN
 
Abstract: 

The Lakhshak granitoid intrusion which is located in the northwest of Zahedan is a part of Zahedan- Saravan plutonic belt. This Oligo-Miocene intrusion, intruded as an elongated pluton into the Eocene flysh type meta-sediments that in turn belong to the Sistan suture zone, between Lut and Afghan blocks. The marginal granitoid rocks in the south and southwest of pluton have been plastically deformed during the emplacement of this pluton with approximately 400 m thick and show fabrics such as S-C structures. These rocks display a transition from strongly deformed fabrics at the margin to progressively less deformed fabrics to the center. Moreover, due to high temperature brittfe deformations, igneous primary minerals, such as plagioclase and orthoclase, were broken and filled by some secondary high temperature minerals such as biotite and quartz. Seemingly, some melt was present during these deformations, as indicated by (1) presence of fine grains of quartz, feldspar and biotite aggregates grains in fracture-controlled openings in the primary feldspar crystals, (2) occurrence of quartz and feldspar grains within deformed biotite cleavages, (3) partial plagioclase replacements by quartz and K-feldspar intergrowth, (4) presence of the undeformed granophyric texture in the margin of deformed orthoclase crystals.

 
Keyword(s): MICROSTRUCTURE, DEFORMATION, FOLIATION, RE-CRYSTALLIZATION, GRANITOID
 
References: 
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