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STRUCTURAL CONTROLLERS OF EPITHERMAL MINERALIZATION AT THE GOLD AND COPPER MINES OF KASHMAR, NORTH-EAST IRAN

AUTHOR/S: HASSANI, H.
Sunday 1 August 2010 by Libadmin2003

3rd International Scientific Conference - SGEM2003, www.sgem.org, SGEM2003 Conference Proceedings/ ISBN: 954-918181-2, June 9-13, 2003, 29- 38pp

ABSTRACT

The North part of Kashmar is located 250 Km South-west of Mashhad,
Northeast of Iran. It is a part of Darouneh Fault zone and contains rhyolitic,
andesitic pyroclastic and lava flow.
The geometry of Kashmar strike-slip fault has been reviewed and
described. From the data obtained it appears that fault geometry (the
distribution of shear fractures such as R,R,َP surfaces, Riedel structures) plays
an important role in controlling the location and emplacement of
mineralization of gold and copper ore deposits.
The Riedel structure which was observed along the Northern border of
Darouneh Fault indicates a top-west sense of motion. Similar structures were
observed along the Southern border of Tanourcheh fault as well.
In alterated regions along R, Rَ , P surfaces, intrusion of plutonic rocks
into volcanic rocks have caused the development of propylytic, argillic and
silisic hydrothermal alteration, hosting gold and copper ore deposits. To show
that the observed shear fracture surfaces are indeed not significantly different
from classical Riedel shear pattern a fractal analysis has been done to compare
field observations and classical Riedel shear pattern. The result shows that the
estimated fractal dimension for schematic riedel is about 1.17 which is in
agreement with fractal dimension of field measurement.

Keywords: Kashmar, Iran, Darouneh fault, Mineralization, Gold
& Copper ore deposit, Riedel, Fractal

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