Evidence for early Pennsylvanian subduction initiation in the Mongol–Okhotsk Ocean from the Adaatsag ophiolite (Mongolia)

Zhu, Mingshuai; Pastor‐Galán, Daniel; Miao, Laicheng; Zhang, Fuqin; Ganbat, Ariuntsetseg; Li, Shun; Yang, Shunhu; Wang, Zeli

doi:10.1016/j.lithos.2022.106951

Cited by 8 publications

(4 citation statements)

References 75 publications

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“…Supporting this, Zhu et al. (2023) determined extensive serpentinization (including dunites and harzburgites) around the Adaatsag ophiolite.…”

Section: Discussionmentioning

confidence: 88%

“…In this scenario, interconnected conductive minerals, such as magnetite, that are commonly found in serpentinite and in mafic and ultramafic rocks, and which are greatly enhanced by deformation, can explain both the low electrical resistivity and the strong decrease in seismic velocity (Heinson et al, 2005;Robertson et al, 2015, and references therein;Lebedev et al, 2021). Supporting this, Zhu et al (2023) determined extensive serpentinization (including dunites and harzburgites) around the Adaatsag ophiolite.…”

Section: Evidence For Lithospheric-scale Tectonic Boundariesmentioning

confidence: 87%

“…The proposed location of the Mongol-Okhotsk suture zone is drawn from Tomurtogoo et al (2005) (long-dash red line) and Zhao et al (2017) (dashed red line). The location of the Adaatsag ophiolite is indicated with an orange ellipse (center; Tomurtogoo et al, 2005); the Bayankhongor ophiolite is outlined with an orange polygon (Badarch et al, 2002); the Khuhu Davaa ophiolite is marked with a small orange circle (Zhu et al, 2023). The proposed location of an accretionary wedge (Hangai-Hentei basin) is drawn (dotted purple line) from Zhao et al (2017).…”

Section: Geodynamic Implicationsmentioning

confidence: 99%

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Insights Into the Structure of the Mongol‐Okhotsk Suture Zone, Adaatsag Ophiolite, and Tectonic Boundaries of the Central Asian Orogenic Belt (Mongolia) From Electrical Resistivity Imaging and Seismic Velocity Models

Comeau,

Rigaud,

Batmagnai

et al. 2024

JGR Solid Earth

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The Mongol‐Okhotsk suture and the Adaatsag ophiolite belt are associated with the closure of the Mongol‐Okhotsk paleo‐ocean and are located within the Central Asian Orogenic Belt (CAOB) and Mongolia. The suture zone is flanked by volcanic‐plutonic belts that host significant metallogenic zones, containing deposits of copper and gold. The tectonic evolution of this region is not fully understood and the lithospheric structure has been poorly studied. We analyze magnetotelluric data and generate a model of the electrical resistivity distribution across this region. Whereas the northern segment has a sharp transition from a high‐resistivity upper crust to a low‐resistivity lower crust, as observed beneath the Hangai Dome, the southern segment does not show this transition. A wide, low‐resistivity zone (1–100 Ωm) imaged in the crust and lithospheric mantle is coincident with the Mongol‐Okhotsk suture and ophiolite, revealing a clear and significant lithospheric‐scale feature. Across the profile, numerous narrow, vertically oriented, low‐resistivity features (1–100 Ωm) are spatially associated remarkably well with the proposed boundaries of tectonic domains. These results confirm ideas about the development of the CAOB. Some of these low‐resistivity features are beneath the surface locations of large mineral zones, and likely represent fossil fluid pathways. We show congruent seismic velocity models for comparison and the results show a large‐scale low‐velocity anomaly (decrease of 2%–3%) that correlates with the location of the low‐resistivity anomaly below the Mongol‐Okhotsk suture. The geophysical results, combined with geological and geochemical data, provide insights into the structure of this region and help shed light on unanswered questions.

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“…Supporting this, Zhu et al. (2023) determined extensive serpentinization (including dunites and harzburgites) around the Adaatsag ophiolite.…”

Section: Discussionmentioning

confidence: 88%

Section: Evidence For Lithospheric-scale Tectonic Boundariesmentioning

confidence: 87%

Section: Geodynamic Implicationsmentioning

confidence: 99%

See 1 more Smart Citation

Insights Into the Structure of the Mongol‐Okhotsk Suture Zone, Adaatsag Ophiolite, and Tectonic Boundaries of the Central Asian Orogenic Belt (Mongolia) From Electrical Resistivity Imaging and Seismic Velocity Models

Comeau,

Rigaud,

Batmagnai

et al. 2024

JGR Solid Earth

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“…Concentric horseshoe‐shaped microcontinental ribbons and magmatic‐arc belts, and U‐shaped aeromagnetic pattern suggest the Mongol‐Okhotsk orogenic belt has an arcuate geometry and likely represents an orocline that developed during the closure of the MOO between Siberian Craton and the Amur Block (Xiao et al., 2015; Zorin, 1999). The MOO began subducting during the Pennsylvanian (Zhu, Pastor‐Galán, et al., 2023) and was consumed by subduction on both of its margins, southward under the Amur Block and northward under the Siberian Craton (Donskaya et al., 2013). The final closure of the MOO is estimated to have occurred between the Early–Middle Jurassic and Early Cretaceous, leading to the collision of the Siberian Craton with the Amur Block (e.g., Van der Voo et al., 2015; Yi & Meert, 2020).…”

Section: Geological Setting and Analytical Methodsmentioning

confidence: 99%

The Beginning of a Wilson Cycle in an Accretionary Orogen: The Mongol–Okhotsk Ocean Opened Assisted by a Devonian Mantle Plume

Zhu,

Pastor–Galán,

Smit

et al. 2024

Geophysical Research Letters

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The opening of oceans within accretionary orogens is important for understanding the Wilson cycle. The Mongol–Okhotsk Ocean (MOO) began opening within the early Paleozoic accretionary collage of the Central Asian Orogenic Belt (CAOB), representing a world‐class example to constrain the geodynamic history of ocean opening in accretionary orogens, but the kinematics and mechanisms associated to this process are highly debated. We report on a newly‐discovered bimodal volcanic suite and associated volcanic‐sediments that comprise part of the Altay‐Sayan Rift System, which indicate a widespread Early Devonian extensional event within the CAOB. This extension regime is attributed to a Devonian mantle plume, which is thought to have impinged upon and weakened the lithosphere of the Early Paleozoic collage, and drove the opening of the MOO. Opening of the MOO suggests continent breakup in accretionary orogens tends to focus along intervening weak orogenic lithosphere between the rigid microcontinents.

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Evolution and final closure of the Mongol-Okhotsk Ocean

Zhao,

Xu,

Chen

2023

Sci. China Earth Sci.

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Evidence for early Pennsylvanian subduction initiation in the Mongol–Okhotsk Ocean from the Adaatsag ophiolite (Mongolia)

Cited by 8 publications

References 75 publications

Insights Into the Structure of the Mongol‐Okhotsk Suture Zone, Adaatsag Ophiolite, and Tectonic Boundaries of the Central Asian Orogenic Belt (Mongolia) From Electrical Resistivity Imaging and Seismic Velocity Models

Insights Into the Structure of the Mongol‐Okhotsk Suture Zone, Adaatsag Ophiolite, and Tectonic Boundaries of the Central Asian Orogenic Belt (Mongolia) From Electrical Resistivity Imaging and Seismic Velocity Models

The Beginning of a Wilson Cycle in an Accretionary Orogen: The Mongol–Okhotsk Ocean Opened Assisted by a Devonian Mantle Plume

Evolution and final closure of the Mongol-Okhotsk Ocean

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