One line on the map: A review of the geological history of the Semail Thrust, Oman-UAE mountains

Searle, Mike; Rioux, Matthew; Garber, Joshua M.

doi:10.1016/j.jsg.2022.104594

Cited by 15 publications

(11 citation statements)

References 77 publications

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“…In contrast, Searle et al. (2022, their Figure 6) implied that the HP overprint of the Ruwi subunit occurred already at 96‐94 Ma in the Samail subduction zone, which at that time was characterized by a thermal gradient of 30°C km −1 . A problem with the Searle et al.…”

Section: Settingmentioning

confidence: 90%

“…The intraoceanic Samail subduction zone formed in the mid‐Cretaceous and the igneous oceanic rocks, which subsequently formed the Samail Ophiolite, crystallized above this subduction zone (Guilmette et al., 2018; Hacker & Gnos, 1997; Rioux et al., 2021; Searle, 2007). Many authors explain that sole metamorphism, ophiolite obduction, and the supposedly distinctly later (15–20 Ma) formation of the entire HP complex occurred by tectonic processes in this single subduction zone (Agard et al., 2020; Searle et al., 2022; Soret et al., 2022). The age break of 15–20 Ma would be in line with the envisaged timeframe for subduction‐zone thermal equilibration (Lallemand & Arcay, 2021; Peacock, 1990).…”

Section: Settingmentioning

confidence: 99%

“…At the interface between the ophiolite and the most distal Hawasina rocks is a metamorphic sole under the Samail Ophiolite (e.g., Ambrose et al., 2021; Cowan et al., 2014; Garber et al., 2020; Guilmette et al., 2018), which displays an inverse metamorphic gradient with granulite‐facies at its top and greenschist‐facies rocks at its base. The strongly sheared and attenuated remnants of the metamorphic sole delineate the thrust zone that emplaced the Samail Ophiolite (Searle et al., 2022).…”

Section: Settingmentioning

confidence: 99%

“…(d) Simplified NE‐SW cross section showing HP units below non‐HP Samail Ophiolite and Hawasina nappes (modified from Searle et al. (2022)).…”

Section: Introductionmentioning

confidence: 99%

“…(c) Current plate-tectonic setting of Arabian Plate and position of map in (a). (d) Simplified NE-SW cross section showing HP units below non-HP Samail Ophiolite and Hawasina nappes (modified from Searle et al (2022)).…”

mentioning

confidence: 99%

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Some Like It Cold: The “Conundrum of Samail” Revisited

et al. 2023

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The "conundrum of Samail" (Hacker & Gnos, 1997) refers to the interaction of "hot" processes of subduction initiation with "cold" high-pressure (HP) metamorphism in the Oman Mountains. Hacker and Gnos (1997) discussed the example of the far-traveled, non-HP Samail Ophiolite and its underlying high-temperature (HT) metamorphic sole that formed above an infant, hot, intraoceanic subduction zone and overlies the cold, continental Saih Hatat HP complex that originated in a mature subduction setting (Figures 1 and 2).The onset of intraoceanic subduction is associated with the formation of a metamorphic sole (i.e., HT rocks subsequently welded to the base of the suprasubduction-zone ophiolite) reflecting elevated, transient thermal gradients (e.g., Dewey & Bird, 1971;Stern & Bloomer, 1992), which in the intraoceanic Samail subduction zone at the northeastern Arabian margin in Oman were up to ∼30°C km −1 (e.g., Garber et al., 2020;Searle & Cox, 2002). The available age data constraining high-grade metamorphism and partial melting of the metamorphic sole and subsequent formation of the Samail Ophiolite (Garber et al., 2020;Guilmette et al., 2018;Rioux et al., 2021;Soret et al., 2022) demonstrate hot subduction-zone processes between 105 and 93 Ma (Figure 3). Compiled data from 70 subduction zones by Lallemand and Arcay (2021) and numerical modeling by Peacock (1990) indicate that it takes 5-15 Ma between hot subduction-zone initiation and self-sustained, steady-state subduction characterized by a stable, low-thermal gradient of ∼10°C km −1 .The almost completely exposed Saih Hatat window (Figure 2) represents a formidable example of a HP complex and provides a one-of-a-kind natural laboratory important for understanding subduction-zone processes. A shortcoming of the Saih Hatat HP rocks is its controversial and incomplete geochronology. Almost all geochronologic

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Section: Settingmentioning

confidence: 90%