Origin and tectonic setting of stratabound tungsten mineralization within the Hindu Kush of Pakistan

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doi: 10.1144/gsjgs.146.6.1003
Authors:Leake, R. C.; Fletcher, C. J. N.; Haslam, H. W.; Khan, B.; Shakirullah
Author Affiliations:Primary:
Br. Geol. Surv., Keyworth, Nottingham, United Kingdom
Other:
Sarhad Dev. Auth., Pakistan
Volume Title:Journal of the Geological Society of London
Source:Journal of the Geological Society of London, 146(6), p.1003-1016. Publisher: Geological Society of London, London, United Kingdom. ISSN: 0016-7649
Publication Date:1989
Note:In English. 47 refs.; illus. incl. 1 table
Summary:Stratabound scheelite mineralization has been discovered in the Hindu Kush as a result of a geochemical drainage survey. The mineralization occurs mainly in clinozoisite-bearing calc-silicate quartzites, with a sequence of mica-schist and subordinate graphitic phyllite, mica quartzite, tourmalinite and feldspathic gneiss, but not in adjacent calcite marble. The sequence is intruded by a small leucogranite stock emplaced after the climax of Barrovian-type metamorphism during deformation related to continent-arc collisions in the Cretaceous and Eocene. In the calc- silicate quartzites, scheelite crystallized simultaneously with clinozoisite before the leucogranite emplacement and is clearly of metamorphic origin. Tungsten-bearing brines, generated from hot springs in an extensional tectonic environment, are thought to have been concentrated in the relatively porous precursor of the calc-silicate during diagenesis. Subsequent metamorphism recrystallized the W as scheelite along with metamorphic silicate minerals and caused limited mobility of the element into veins. [R.A.H.]
Subjects:Economic geology; Emplacement; Metal ores; Mineral deposits, genesis; Mineralization; Stratabound deposits; Structural controls; Tungsten ores; Veins; Asia; Hindu Kush; Indian Peninsula; Pakistan; Northern Pakistan
Abstract Numbers:90M/1503
Record ID:1990013284
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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