Tectonic development of the Samail ophiolite: High-precision U-Pb zircon geochronology and Sm-Nd isotopic constraints on crustal growth and emplacement

Autor:	Matthew Rioux, Samuel A. Bowring, Stacia M. Gordon, Robert B. Miller, Peter B. Kelemen, F. O. Dudas
Rok vydání:	2013
Předmět:	geography geography.geographical_feature_category Subduction Geochemistry Crust Mid-ocean ridge Ophiolite Mantle (geology) Geophysics Space and Planetary Science Geochemistry and Petrology Semail Ophiolite Geochronology Earth and Planetary Sciences (miscellaneous) Geology Zircon
Zdroj:	Journal of Geophysical Research: Solid Earth. 118:2085-2101
ISSN:	2169-9313
Popis:	[1] New high-precision single grain U-Pb zircon geochronology and whole rock Nd isotopic data provide insight into the magmatic and tectonic development of the Samail ophiolite. The analyzed rocks can be broadly divided into two groups based on their structural position, dates, and isotopic composition: an older group related to on-axis magmatism and a younger group of post-ridge dikes, sills, and stocks. On-axis gabbros, tonalites and trondhjemites yielded Th-corrected 206Pb/238U dates from 96.441 ± 0.062 to 95.478 ± 0.056 Ma. These dates, combined with dates from Rioux et al. (2012), suggest that most of the ophiolite crust formed at an oceanic spreading center in
Databáze:	OpenAIRE
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