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Ballooning emplacement and alteration of the Chah-Musa subvolcanic intrusion (NE Iran) inferred from magnetic susceptibility and fabric

Published online by Cambridge University Press:  19 November 2019

Ali Seifivand  and
Maryam Sheibi Open the ORCID record for Maryam Sheibi [Opens in a new window]
Ali Seifivand
Affiliation:
Faculty of Earth Sciences, Shahrood University of Technology, Shahrood, Iran
Maryam Sheibi*
Affiliation:
Faculty of Earth Sciences, Shahrood University of Technology, Shahrood, Iran
*
*Author for correspondence: Maryam Sheibi, Email: sheibi@shahroodut.ac.ir
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Abstract

The porphyritic diorite Chah-Musa subvolcanic intrusion is located in the Toroud-Chah Shirin magmatic arc in the northern Central Iranian structural zone. The elliptical Chah-Musa body hosts a copper deposit and intrudes an Eocene sequence of volcanic breccia, agglomerate and red tuffaceous sediment. High magnetic susceptibility values are attributed to the presence of magnetite as a magnetic carrier. Changes in bulk magnetic susceptibility correlate with zonation of alteration in the intrusion. Although the degree of anisotropy of magnetic susceptibility decreases due to hydrothermal alteration, the field observations confirm that this parameter can be used as a strain marker. Strongly oblate magnetic ellipsoids are found in the eastern half of the intrusion where isolated outcrops of flat-lying tuffaceous host cover dioritic rocks (roof zone). Stations with prolate ellipsoids mostly belong to the centre of the intrusion where the magnetic lineations plunge steeply. They are interpreted as indicating the main feeder zone. The concentric fabric pattern at the periphery of intrusion, the oblate magnetic ellipsoids at the roof, the highest anisotropy degree along the small diameter of the intrusion, and an intense deformation of the host rocks, especially at the western margin, all are evidence that the intrusion was ballooning during the late stages of its emplacement. Ascent and emplacement of the Chah-Musa body is ascribed to the tensional space provided by a dextral shear zone created by the regional left-lateral movement on the bounding Anjilow and Toroud strike-slip faults.

Keywords

anisotropy of magnetic susceptibility (AMS)ballooningshear zoneToruod – Chah Shirin (TCS) magmatic arctranspressionChah-MusaIran
Type
Original Article
Information
Geological Magazine , Volume 157 , Issue 4 , April 2020 , pp. 621 - 639
Copyright
© Cambridge University Press 2019

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