Cambro-Ordovician potassic (alkaline) magmatism in Central Oman

Petrological and geochemical constraints on petrogenesis

M. A. Worthing, S. Nasir

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

Cambro-Ordovician alkaline magmatism is exposed in four small laccolithic intrusions in the Huqf area of Central Oman. 40Ar/39Ar dating suggests the presence of two pulses of magmatism at approximately 513-526 Ma and 452-461 Ma. The emplacement of ultramafic foidites characterized the earlier stage of magmatism, while later stage resulted in the intrusion of a sequence of mildly potassic minettes and tephrites. The source of the magmas has many similarities to that of EM1 oceanic island basalts. Trace element evidence however, suggests enrichment of the protolith by supra-subduction zone fluids. The petrogenesis of the suite is therefore explained by mixing of melts derived by small degree partial melting of previously enriched garnet- and spinel-peridotite-facies mantle sources, caused by a perturbed geotherm during minor lithospheric extension.

Original languageEnglish
Pages (from-to)25-38
Number of pages14
JournalLithos
Volume106
Issue number1-2
DOIs
Publication statusPublished - Nov 2008

Fingerprint

Garnets
Trace Elements
petrogenesis
magmatism
Ordovician
Melting
Fluids
protolith
mantle source
peridotite
spinel
subduction zone
partial melting
garnet
emplacement
basalt
trace element
melt
fluid
spinell

Keywords

  • Al-Huqf
  • Cambro-Ordovician
  • Central Oman
  • Geochronology
  • Mantle sources
  • Potassic magmatism

ASJC Scopus subject areas

  • Geochemistry and Petrology

Cite this

Cambro-Ordovician potassic (alkaline) magmatism in Central Oman : Petrological and geochemical constraints on petrogenesis. / Worthing, M. A.; Nasir, S.

In: Lithos, Vol. 106, No. 1-2, 11.2008, p. 25-38.

Research output: Contribution to journalArticle

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N2 - Cambro-Ordovician alkaline magmatism is exposed in four small laccolithic intrusions in the Huqf area of Central Oman. 40Ar/39Ar dating suggests the presence of two pulses of magmatism at approximately 513-526 Ma and 452-461 Ma. The emplacement of ultramafic foidites characterized the earlier stage of magmatism, while later stage resulted in the intrusion of a sequence of mildly potassic minettes and tephrites. The source of the magmas has many similarities to that of EM1 oceanic island basalts. Trace element evidence however, suggests enrichment of the protolith by supra-subduction zone fluids. The petrogenesis of the suite is therefore explained by mixing of melts derived by small degree partial melting of previously enriched garnet- and spinel-peridotite-facies mantle sources, caused by a perturbed geotherm during minor lithospheric extension.

AB - Cambro-Ordovician alkaline magmatism is exposed in four small laccolithic intrusions in the Huqf area of Central Oman. 40Ar/39Ar dating suggests the presence of two pulses of magmatism at approximately 513-526 Ma and 452-461 Ma. The emplacement of ultramafic foidites characterized the earlier stage of magmatism, while later stage resulted in the intrusion of a sequence of mildly potassic minettes and tephrites. The source of the magmas has many similarities to that of EM1 oceanic island basalts. Trace element evidence however, suggests enrichment of the protolith by supra-subduction zone fluids. The petrogenesis of the suite is therefore explained by mixing of melts derived by small degree partial melting of previously enriched garnet- and spinel-peridotite-facies mantle sources, caused by a perturbed geotherm during minor lithospheric extension.

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