Magnetic susceptibility survey of Hiamlaya-Karakoram range in Northern
Pakistan: Geotectonic interpretation and mineralization assessment
Mirza Naseer Ahmad 1) and Mitsuo Yoshida 2)
1) Geoscience Laboratory, Geological Survey of Pakistan, Islamabad, Pakistan.
2) Geoscience Co.Ltd., Japan. e-mail: myoshida@mtci.ne.jp
Abstract
The Himalaya-Karakoram range in Northern Pakistan is a collision belt where
island arc crusts were captured between the Indian subcontinent and Asian
continent. Magnetic susceptibility survey of the granitoids and associated
rocks in the Himalaya-Karakoram range was conducted for mineral exploration.
The magnetic susceptibility of granitoids in Indian subcontinent and
Karakoram block generally shows low values relating to the ilmenite-series.
Similarly the granitoids in Kohistan arc mostly give low susceptibility
values of ilmenite-series except the northern part of Kohistan batholith
which shows high susceptibility values indicating the magnetite-series. On
contrary, the majority of granitoids in Ladakh arc marks considerably high
susceptibility. Magnetite-series granitoids are generally formed a
magmatism with relatively oxidizing condition which often occurs various
sulfides mineralization, while ilmenite-series granitoids are formed a
magmatism with relatively reducing condition which is mostly poor in
mineralization potential. This variation in granitic magmatism probably
attributes to a difference in geotectonic setting of terranes. Thus present
study recommends further mineral exploration of mineralization zones
associated with the granitoids in Ladakh arc and northern part of Kohistan
arc.
raeg98@tansa.kumst.kyoto-u.ac.jp
Last modified: Mon Sep 21 09:24:29 1998