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• W2093513680 startingPage "n/a" @default.
• W2093513680 abstract "[1] New high-precision U/Pb zircon geochronology from the Oman-United Arab Emirates (U.A.E.) ophiolite provides insight into the timing and duration of magmatism and the tectonic setting during formation of the lower crust. The new data come from a well-preserved and exposed crustal section in the center of the Wadi Tayin massif. Single grain and grain fragment 206Pb/238U dates from upper-level gabbros, tonalites/trondhjemites and gabbroic pegmatites, corrected for initial Th exclusion, range from 112.55 ± 0.21 to 95.50 ± 0.17 Ma, with most data clustered between 96.40 ± 0.17 to 95.50 ± 0.17 Ma. Zircon dates from upper-level gabbros are most consistent with the ophiolite forming at a fast spreading ridge with half-rates of 50–100 km/Ma. Dates from tonalites/trondhjemites and from a gabbroic pegmatite associated with a wehrlite intrusion overlap with dates from adjacent upper-level gabbros, suggesting that any age differences between these three magmatic series are smaller than the analytical uncertainties or intrasample variability in the dates. Three of the dated upper-level gabbros and a single gabbroic pegmatite from the base of the crust have >1 Ma intrasample variability in single grain dates, suggesting assimilation of older crust during the formation or crystallization of the magmas. Whole rock εNd(t) of seven samples, including the upper-level gabbros with variable zircon dates, have tightly clustered initial values ranging from εNd(96 Ma) = 7.59 ± 0.23 to 8.28 ± 0.31. The εNd values are similar to those from other gabbros within the ophiolite, suggesting that any assimilated material had a similar isotopic composition to primitive basaltic magmas. The new dates suggest that the studied section formed at a fast spreading mid-ocean ridge between ∼96.4–95.5 Ma. The large intrasample variability in zircon dates in some samples is unexpected in this setting, and may be related to propagation of a younger ridge into older oceanic lithosphere." @default.
• W2093513680 created "2016-06-24" @default.
• W2093513680 creator A5029152300 @default.
• W2093513680 creator A5030173615 @default.
• W2093513680 creator A5030977111 @default.
• W2093513680 creator A5032279664 @default.
• W2093513680 creator A5054899939 @default.
• W2093513680 creator A5074304447 @default.
• W2093513680 date "2012-07-01" @default.
• W2093513680 modified "2023-10-16" @default.
• W2093513680 title "Rapid crustal accretion and magma assimilation in the Oman-U.A.E. ophiolite: High precision U-Pb zircon geochronology of the gabbroic crust" @default.
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