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Petrogenesis and tectonomagmatic significance of Eocene mafic intrusions from the Neotethyan suture zone in the Muslim Bagh-Khanozai region, Pakistan

Kerr, Andrew, Lavis, Owain, Kakar, M. Ishaq and McDonald, Iain 2016. Petrogenesis and tectonomagmatic significance of Eocene mafic intrusions from the Neotethyan suture zone in the Muslim Bagh-Khanozai region, Pakistan. Journal of the Geological Society 173 , pp. 518-530. 10.1144/jgs2015-062

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Abstract

New geochemical data for mafic intrusions within the Eocene Nisai Formation along the suture zone between the Indian and Eurasian plates are used to constrain their petrogenesis and assess the local tectonics and mantle dynamics. Petrological and geochemical data indicate that these alkalic intrusions have moderately enriched incompatible trace element compositions similar to ocean island basalt magmatism. Modelling suggests that these intrusions are the result of 1–5% melting of a deep, enriched, predominantly garnet lherzolite, with a small amount of subduction-derived fluids. These melts then underwent fractional crystallization at lithospheric depths of c. 30 km. Supplementary material: Detailed information on each analysed sample including field notes and latitude and longitude, replicate analysis of standards, and fractional crystallization modelling are available at http://www.geolsoc.org.uk/SUP18893.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Earth and Ocean Sciences
Subjects: Q Science > QE Geology
Additional Information: PDF uploaded in accordance with publisher's policies at http://www.sherpa.ac.uk/romeo/issn/0016-7649/ (accessed 5.5.16).
Publisher: Geological Society of London
ISSN: 0016-7649
Related URLs:
Date of First Compliant Deposit: 30 March 2016
Date of Acceptance: 14 October 2015
Last Modified: 28 Dec 2017 18:32
URI: http://orca.cf.ac.uk/id/eprint/83788

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