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U-Pb zircon crystallization age of the Muslim Bagh Ophiolite; enigmatic remains of an extensive pre-Himalayan arc

M. Ishaq Kakar, Alan S. Collins, Khalid Mahmood, John D. Foden and Mehrab Khan
U-Pb zircon crystallization age of the Muslim Bagh Ophiolite; enigmatic remains of an extensive pre-Himalayan arc
Geology (Boulder) (September 2012) 40 (12): 1099-1102

Abstract

The pre-Himalayan evolution of Tethys is fundamental in interpreting the significance of India's Paleogene deceleration and the timing of the India-Eurasia collision--the archetype continental collision that governs our understanding of collisional processes. Here we date zircons from plagiogranite sheeted dikes in the Muslim Bagh ophiolite that yield a U-Pb age of 80.2 + or - 1.5 Ma. This age is interpreted as dating the crystallization of plagiogranites that occur at the top of gabbro plutons as well as within sheeted dikes. These represent highly fractionated magma chamber differentiates. The plagiogranite's trace element abundances are typical of subduction petrogenesis and can be explained by the addition of slab-derived components to a depleted mantle wedge. Muslim Bagh ophiolite formation was coeval with the Spongtang Arc in a similar tectonic environment. We interpret the chain of ophiolites within western Pakistan as corollaries of the Spongtang Arc that formed approximately 15 Ma before they were obducted on the Indian passive margin. These form an extensive arc system that developed as oceanic crust in Tethys foundered during India's migration north. Latest Maastrichtian ophiolite-sole formation and subsequent Paleocene obduction of the arc onto India was the first arc-India collision--a herald of the collisions to come later.


ISSN: 0091-7613
EISSN: 1943-2682
Coden: GLGYBA
Serial Title: Geology (Boulder)
Serial Volume: 40
Serial Issue: 12
Title: U-Pb zircon crystallization age of the Muslim Bagh Ophiolite; enigmatic remains of an extensive pre-Himalayan arc
Affiliation: University of Balochistan, Centre of Excellence in Mineralogy, Quetta, Pakistan
Pages: 1099-1102
Published: 20120918
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
References: 37
Accession Number: 2012-101263
Categories: Solid-earth geophysicsGeochronology
Document Type: Serial
Bibliographic Level: Analytic
Annotation: With GSA Data Repository Item 2012318; accessed on October 15, 2012
Illustration Description: illus. incl. geol. sketch map
Source Medium: WWW
N30°34'60" - N31°15'00", E67°30'00" - E68°00'00"
Secondary Affiliation: University of Adelaide, AUS, Australia
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States
Update Code: 201252
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