Petrogenesis of plagiogranites in the Muslim Bagh Ophiolite, Pakistan: implications for the generation of Archaean continental crust

High-SiO2 rocks referred to as oceanic plagiogranites are common within the crustal sequences of ophiolites; however, their mode of petrogenesis is controversial with both late-stage fractional crystallization and partial melting models being proposed. Here, we present new whole-rock data from plagi...

Full description

Saved in:
Bibliographic Details
Published in:Geological magazine 2019-05, Vol.156 (5), p.874-888
Main Authors: COX, DANIEL, KERR, ANDREW C., HASTIE, ALAN R., KAKAR, M. ISHAQ
Format: Article
Language:English
Subjects:
Archean
Asia
Continental crust
Cretaceous
crust
Crystallization
dikes
diorites
Earth
Fractional crystallization
Fractionation
Gabbro
Geophysics
igneous and metamorphic rocks
igneous rocks
Indian Peninsula
intrusions
Jang Tor Ghar Massif
Magma
magmas
major elements
Melting
Mesozoic
Modelling
Muslim Bagh Ophiolite
northwestern Pakistan
ophiolite
Ophiolites
Original Article
Pakistan
partial melting
Petrogenesis
Petrology
plagiogranite
plutonic rocks
Precambrian
Rare earth elements
Rock
Rocks
Saplai Tor Ghar Massif
Silica
Silicon dioxide
solid Earth (tectonophysics)
Subduction
Subduction (geology)
Subduction zones
Titanium dioxide
tonalite-trondhjemite-granodiorite magmas
Trace elements
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:High-SiO2 rocks referred to as oceanic plagiogranites are common within the crustal sequences of ophiolites; however, their mode of petrogenesis is controversial with both late-stage fractional crystallization and partial melting models being proposed. Here, we present new whole-rock data from plagiogranitic dyke-like bodies and lenses from the lower and middle sections of the sheeted dyke complex of the Cretaceous Muslim Bagh Ophiolite, northwestern Pakistan. The plagiogranites have similar geochemical signatures that are inconsistent with them being the fractionation products of the mafic units of the Muslim Bagh Ophiolite. However, the plagiogranites all display very low TiO2 contents (
ISSN:0016-7568
1469-5081
DOI:10.1017/S0016756818000250