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Some Like It Cold: The “Conundrum of Samail” Revisited
Stockholm University, Faculty of Science, Department of Geological Sciences.ORCID iD: 0000-0003-3347-9284
Stockholm University, Faculty of Science, Department of Geological Sciences.ORCID iD: 0000-0002-2654-8686
Number of Authors: 42023 (English)In: Tectonics, ISSN 0278-7407, E-ISSN 1944-9194, Vol. 42, no 1, article id e2022TC007531Article in journal (Refereed) Published
Abstract [en]

Most tectonic models consider that the “Samail subduction zone” was the only subduction zone at the mid-Cretaceous convergent Arabian margin. We report four new Rb-Sr multimineral isochron ages from high-pressure (HP) rocks and a major shear zone of the uppermost Ruwi-Yiti Unit of the Saih Hatat window in the Oman Mountains of NE Arabia. These ages demand a reassessment of the intraoceanic suprasubduction-zone evolution that formed the Samail Ophiolite and its metamorphic sole in the Samail subduction zone. Our new ages constrain waning HP metamorphism of the Ruwi subunit at ∼99-96 Ma and associated deformation in the Yenkit shear zone between ∼104 and 93 Ma. Our ages for late stages of deformation and HP metamorphism (thermal gradients of ∼8–10°C km−1) overlap with published ages of ∼105-102 Ma for Samail-subduction-zone prograde-to-peak metamorphism (thermal gradients of ∼20–25°C km−1), subsequent decompressional partial melting of the metamorphic sole and suprasubduction-zone crystallization of the Samail Ophiolite (thermal gradients of ∼30°C km−1) between ∼100 and 93 Ma. Thermal considerations demand that two subduction zones existed at the mid-Cretaceous Arabian margin. High-pressure metamorphism of the Ruwi-Yiti rocks occurred in a mature, thermally equilibrated “Ruwi subduction zone” that formed at ∼110 Ma. Initiation of the infant, thermally unequilibrated and, thus, immature, outboard intraoceanic Samail subduction zone occurred at ∼105 Ma. The Samail Ophiolite and its metamorphic sole were then thrust over the exhuming Ruwi-Yiti HP rocks and onto the Arabian margin after ∼92 Ma, while the bulk of the Saih Hatat HP rocks below the Ruwi-Yiti Unit started to be underthrust in the Ruwi subduction zone.

Place, publisher, year, edition, pages
2023. Vol. 42, no 1, article id e2022TC007531
Keywords [en]
subduction zone, high-pressure rocks, high-temperature rocks, geochronology, Saih Hatat window, Oman
National Category
Geology
Identifiers
URN: urn:nbn:se:su:diva-229517DOI: 10.1029/2022TC007531ISI: 000998826400001Scopus ID: 2-s2.0-85147094801OAI: oai:DiVA.org:su-229517DiVA, id: diva2:1860954
Available from: 2024-05-27 Created: 2024-05-27 Last updated: 2024-05-27Bibliographically approved

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Ring, UweHansman, Reuben

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