Unravelling the Neoproterozoic Accretionary History of Oman, Using an Array of Isotopic Systems in Zircon.
JOURNAL OF THE GEOLOGICAL SOCIETY(2020)
Abstract
The Omani basement is a critical window into the Neoproterozoic tectonic geography of the Mozambique Ocean and the amalgamation of Gondwana. It is located east of the juvenile arc terranes of the Arabian-Nubian Shield, yet the relationship between the two is not well understood. Magmatic and detrital zircon samples were analysed from four main basement terranes: Mirbat, the Huqf, Jebel Ja'alan and Al Jobah. The U-Pb (zircon) ages from igneous samples give ages between 838 and 765 Ma. The Lu-Hf and oxygen isotopes show that the zircons are juvenile (epsilon(Hf)(t) values 10.5-8.7), with low delta O-18 values (c. 2-6 parts per thousand). Detritus from sediments in Mirbat, the southernmost basement outcrop, preserves a main age peak at c. 786 Ma, with Lu-Hf between +6.05 and +12.64. Lu-Hf isotopic data for Proterozoic detrital zircons from Jebel Ja'alan suggest that this region was depositionally connected to a source yielding both evolved Tonian and Neoarchean to Paleoproterozoic detritus. These sources could correlate to the terranes in India and South China, which record similarly low delta O-18 values. These data support a model in which Oman formed in its own tectonic domain, accreting onto the Neoproterozoic active margin of a continent.
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Key words
neoproterozoic accretionary history,oman,isotopic systems
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