@article{d1966e1a11c245db9c04bc9837197643,
title = "Cambro-Ordovician potassic (alkaline) magmatism in Central Oman: Petrological and geochemical constraints on petrogenesis",
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.",
keywords = "Al-Huqf, Cambro-Ordovician, Central Oman, Geochronology, Mantle sources, Potassic magmatism",
author = "Worthing, {M. A.} and S. Nasir",
note = "Funding Information: This work was supported by the Sultan Qaboos University HM-Grant SR/Sci/ETHS/06/01 (SN) and ES/96/02 plus IG/SCI/ETH/00/01 supplemented by Petroleum Development Oman (MW). These are gratefully acknowledged. We also thank Heiko Oterdoom of PDO and Elizabeth, Mark and Andrew Worthing for assistance with the fieldwork, Thomas They, University of Stuttgart for help with the microprobe analysis. Kent Brooks of the University of Copenhagen is thanked for providing many of the XRF analyses. Phil Robinson and David Steele both of the University of Tasmania, Australia assisted with whole-rock, REE and trace element analyses and some of themineral analyses. Bob Duncan of Oregon State University did the Ar–Ar dating and kindly reprocessed the data for this article. Clive Burrett provided study facilities for MW in the Department of Geology, University of Tasmania. We thank Andrew Kerr, Ray Kent and Ulf Andersson for their constructive comments and reviewing which improved the manuscript. ",
year = "2008",
month = nov,
doi = "10.1016/j.lithos.2008.05.012",
language = "English",
volume = "106",
pages = "25--38",
journal = "Lithos",
issn = "0024-4937",
publisher = "Elsevier",
number = "1-2",
}