Geochemistry and petrology of rift-related mafic sills and arc-related Gabbro–Diorite bodies, Northern Bafq District, Central Iran

Geochemistry and petrology of rift-related mafic sills and arc-related Gabbro–Diorite bodies,... Two types of mafic intrusions have been recognized in the north of the Bafq district, Central Iran. A number of olivine-gabbroic to gabbroic sills intruded the Rizu Formation, comprised of alternating carbonate and volcanic rocks. Mineralogical data show that olivine + pyroxene + brown amphibole (kaersutite) + calcic plagioclase + opaque comprise the olivine-gabbroic rocks, and intermediate (or sodic) plagioclase + altered pyroxene and altered amphibole to biotite + opaque minerals the gabbroic rocks. Both rock types have shown within-plate and alkaline characters and have been presumed to be related to rift formation. The mafic-alkaline magma source of the sills is proposed to have been derived from enriched mantle. Regionally, two Gabbro–Diorite intrusions have been identified in the metamorphic complexes. Mineralogical data suggest that the pyroxene + amphibole (hornblende) + plagioclase + biotite + opaque minerals formed the gabbro to diorite intrusions. These rocks have shown characteristics of calc-alkaline and volcanic arc magmatism. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Chinese Journal of Geochemistry Springer Journals

Geochemistry and petrology of rift-related mafic sills and arc-related Gabbro–Diorite bodies, Northern Bafq District, Central Iran

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Publisher
Science Press
Copyright
Copyright © 2017 by Science Press, Institute of Geochemistry, CAS and Springer-Verlag GmbH Germany
Subject
Earth Sciences; Geochemistry
ISSN
1000-9426
eISSN
2365-7499
D.O.I.
10.1007/s11631-017-0191-1
Publisher site
See Article on Publisher Site

Abstract

Two types of mafic intrusions have been recognized in the north of the Bafq district, Central Iran. A number of olivine-gabbroic to gabbroic sills intruded the Rizu Formation, comprised of alternating carbonate and volcanic rocks. Mineralogical data show that olivine + pyroxene + brown amphibole (kaersutite) + calcic plagioclase + opaque comprise the olivine-gabbroic rocks, and intermediate (or sodic) plagioclase + altered pyroxene and altered amphibole to biotite + opaque minerals the gabbroic rocks. Both rock types have shown within-plate and alkaline characters and have been presumed to be related to rift formation. The mafic-alkaline magma source of the sills is proposed to have been derived from enriched mantle. Regionally, two Gabbro–Diorite intrusions have been identified in the metamorphic complexes. Mineralogical data suggest that the pyroxene + amphibole (hornblende) + plagioclase + biotite + opaque minerals formed the gabbro to diorite intrusions. These rocks have shown characteristics of calc-alkaline and volcanic arc magmatism.

Journal

Chinese Journal of GeochemistrySpringer Journals

Published: Jul 4, 2017

References

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