Kinematic and paleomagnetic restoration of the Semail ophiolite (Oman) reveals subduction initiation along an ancient Neotethyan fracture zone

Hinsbergen, Douwe J.J. van; Maffione, Marco; Koornneef, L.M.T.; Guilmette, Carl

doi:10.1016/j.epsl.2019.04.038

Cited by 49 publications

(53 citation statements)

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“…The paleo‐surface heat flow is unknown but can be constrained based on pressure and temperature conditions of ~850 °C and 1 GPa recorded in the metamorphic sole underlying the ophiolite (Agard et al, 2016; Soret et al, 2017). The resulting surface heat flow (0.06 ± 0.01 W·m −2 ) is consistent with these criteria and also with the inferred Permian age of the Samail mantle section and the ~92 Ma mica Ar‐Ar ages from the metamorphic sole (Hacker et al, 1996; Jaupart et al, 2015; van Hinsbergen et al, 2019). The resulting geothermal gradient is 25 ± 0.6 °C km −1 .…”

Section: Discussionsupporting

confidence: 81%

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Ultramafic Rock Carbonation: Constraints From Listvenite Core BT1B, Oman Drilling Project

et al. 2020

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The occurrence of the quartz-carbonate alteration assemblage (listvenite) in ophiolites indicates that ultramafic rock represents an effective sink for dissolved CO 2. However, the majority of earlier studies of ultramafic rock carbonation had to rely on the surface exposure of reaction textures and field relationships. Here we present the first observations on ultramafic rock alteration obtained from the 300 m deep BT1B drill hole, ICDP Oman Drilling Project, allowing for a continuous and high-resolution investigation. Hole BT1B recovered continuous drill core intersecting surface alluvium, 200 m of altered ultramafic rock comprising mainly listvenite and minor serpentinite bands at 90 and 180 m depth, and 100 m of the underlying metamorphic sole. Textural evidence suggests that the carbonation of fully serpentinized harzburgite commenced by non-equilibrium growth of spheroidal carbonate characterized by sectorial zoning resulting from radially oriented low-angle boundaries. In the serpentinite, carbonate spheroids are composed of alternating magnesite cores and dolomite rims, whereas texturally similar carbonate in the listvenite is composed of Fe-rich magnesite cores and CaFe rich magnesite rims. The distinct compositions and mineral inclusions indicate that the carbonation extent was controlled by fluid accessibility resulting in the simultaneous formation of limited carbonate in the serpentinite bands and complete carbonation in the listvenite parts of BT1B. The presence of euhedral magnesite overgrowing spheroidal carbonate in the listvenite suggests near-equilibrium conditions during the final stage of carbonation. The carbonate clumped isotope thermometry constrains carbonate crystallization between 50°C and 250°C, implying repeated infiltration of reactive fluids during ophiolite uplift and cooling.

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Section: Discussionsupporting

confidence: 81%

“…Journal of Geophysical Research: Solid Earth Hinsbergen et al, 2019). The resulting geothermal gradient is 25 ± 0.6°C km −1 .…”

Section: 1029/2019jb019060mentioning

confidence: 98%

Ultramafic Rock Carbonation: Constraints From Listvenite Core BT1B, Oman Drilling Project

et al. 2020

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“…Uncertainties remain as to the locus of subduction nucleation (i.e., dashed vertical line in Fig. 3a): at a transform fault Whattam and Stern, 2011;Zhou et al, 2018;van Hinsbergen et al, 2019), at a ridge (Nicolas and Le Pichon, 1980;Nicolas et al, 2000), in a back-arc basin (Guilmette et al, 2009(Guilmette et al, , 2012 or a former oceanic detachment (Maffione et al, 2015;van Hinsbergen et al, 2015). Whether subduction is induced or spontaneous probably depends on the exact geodynamic configuration, and is a matter of debate (Fig.…”

Section: Ophiolite Types and Subduction Initation J O U R N A L P R Ementioning

confidence: 99%

Slabitization: Mechanisms controlling subduction development and viscous coupling

Agard

Prigent

Soret

et al. 2020

Earth-Science Reviews

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This is a PDF file of an article that has undergone enhancements after acceptance, such as the addition of a cover page and metadata, and formatting for readability, but it is not yet the definitive version of record. This version will undergo additional copyediting, typesetting and review before it is published in its final form, but we are providing this version to give early visibility of the article. Please note that, during the production process, errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.

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“… The reconstructed events based on the SZI database compilation include a the South-Sandwich SZI event at around 40 Ma (modified from ref. 85 ), b the Cascadia SZI event at around 48 Ma 86 , 87 , c the Lesser Antilles event at around 49 Ma 88 , 89 , d the Sunda-Java SZI event at around 50 Ma 90 , e the Aleutian SZI event at around 53 Ma 91 , and f the two SZI events, Anatolia and Oman, at around 104 Ma 92 , 93 . Shown are the new subduction zones (pink lines), other active (solid purple lines) and inactive (dashed purple lines) subduction zones, spreading ridges (solid red lines) and transform faults (red dashed lines).…”

Section: Introductionmentioning

confidence: 99%

A transdisciplinary and community-driven database to unravel subduction zone initiation

et al. 2020

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Subduction zones are pivotal for the recycling of Earth’s outer layer into its interior. However, the conditions under which new subduction zones initiate are enigmatic. Here, we constructed a transdisciplinary database featuring detailed analysis of more than a dozen documented subduction zone initiation events from the last hundred million years. Our initial findings reveal that horizontally forced subduction zone initiation is dominant over the last 100 Ma, and that most initiation events are proximal to pre-existing subduction zones. The SZI Database is expandable to facilitate access to the most current understanding of subduction zone initiation as research progresses, providing a community platform that establishes a common language to sharpen discussion across the Earth Science community.

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Kinematic and paleomagnetic restoration of the Semail ophiolite (Oman) reveals subduction initiation along an ancient Neotethyan fracture zone

Cited by 49 publications

References 50 publications

Ultramafic Rock Carbonation: Constraints From Listvenite Core BT1B, Oman Drilling Project

Ultramafic Rock Carbonation: Constraints From Listvenite Core BT1B, Oman Drilling Project

Slabitization: Mechanisms controlling subduction development and viscous coupling

A transdisciplinary and community-driven database to unravel subduction zone initiation

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