Scientific Quarterly Journal of Geosciences

Scientific Quarterly Journal of Geosciences

The study of the structure of the Alvand Granites

Document Type : Original Research Paper

Authors
Amir Hosein Sadr
Ali Asghar Sepahi Garo
Gholamreza Khanlari
Geology Department, Bu Ali Sina University, Hamedan, Iran
Abstract
In spite of the earlier extensive petrological studies on the Alvand plutonic body, the study of geological structures of this body, had been less considered. Geological structures of this plutonic complex are various and investigable as same as it's petrological variety. Some of the most important primary (magmatic) and secondary (tectonic) structures of granites of this plutonic complex are:
1) primary structures, including of orientation of phenocrysts of feldspar, mica, enclaves and primary fractures or joints, which comprise essential part of the discussion of this paper. These structures confirm an internal flow and syn-emplacement fractures inside the intrusive body.
2) Tectonic structures, including of tectonic fractures and structural changes in rock bodies in solid - state after solidification of plutonic body.
The study of primary and secondary structures of the Alvand granites show that, the structures of this plutonic body can be an important pattern for studying granite tectonic models and many relationships between internal and external (environmental) structures of the intrusive bodies.
Keywords
granites
structures
primary structures
tectonic structures
Alvand
Hamedan
Iran

Subjects

Balk, R., 1937- Structural behavior of igneous rocks: Mem. Geol. Soc. Am.,5,1-77.
Berger, A.R. & Pitcher, W. S., 1970- Structures in granite rocks: Commentary and critique on granite tectonics. Proc. Geol. Ass. 81.
Billings, M. P., 1975 - Structural Geology: Prentice - Hall, 272-382.
Castro, A., 1987- On granitoid emplacement and related structures, A review: Geol. Rdsch.,76,101-124.
Clous, H., 1922 - Uber Ausbou and Anvendung der granittektonischen Methode: Preussinschen Geologischen Landesanstalt, 89,1-18.
Davis, G. H., 1984- Structural Geology of Rocks and Regions: John Wiley and Sons 253-260.
Marre, J., 1986 - The Structural Analysis of Granitic Rocks: Elsevier, Amsterdam.
Munro, M., 1989 - "Igneous intrusion - structural Behavior". The Encyclopedia of Igneous and Metamorphic petrology, Van Nostrand Reinhold, 224-229.
Paterson, S. R. & Vernon, R.H. & Tobish, O. T., 1989 - A review of criteria for the identification of magmatic and tectonic foliation in granitoids: J. S. G. 11/3, 349-363.
Price, N. J. & Cosgrove, J.W., 1991- Analysis of Geological structures: Cambridge Univ. Press, 102-105.
Vernon, R.H., 2000- Review of microstructural evidence of magmatic and solid-state flow, Electronic Geosciences, 5:2.
Scientific Quarterly Journal of Geosciences
Volume 13, 49-50
Autumn & Winter 2004, Vol. 13, No. 49-50
Winter 2004
Pages 90-103