A Closure of the Mongol‐Okhotsk Ocean by the Middle Jurassic: Reconciliation of Paleomagnetic and Geological Evidence

Yi, Zhiyu; Meert, Joseph G.

doi:10.1029/2020gl088235

Cited by 55 publications

(19 citation statements)

References 49 publications

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“…On the contrary, the upper part of the slab inferred is oriented nearly W-E, similar to the present trend of the Mongol-Okhotsk suture. This orientation is consistent with clockwise rotation of the SIB in the Jurassic Period and an oroclinal closure of the Mongol-Okhotsk Ocean in the Middle Jurassic (Yi & Meert, 2020) or latest Jurassic-earliest Cretaceous (Van der Voo et al, 2015).…”

Section: 1029/2020jb019489supporting

confidence: 80%

An Inclination Shallowing‐Corrected Early Triassic Paleomagnetic Pole for the North China Craton: Implication for the Mesozoic Geography of Proto‐Asia

Zhao

Appel

2020

JGR Solid Earth

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The Early Mesozoic is a key period for the formation of the Asia continent. In this study, in order to reconstruct the Early Mesozoic paleogeography of Proto-Asia, we carried out a paleomagnetic study on the Early Triassic strata from the Chengde Basin in the northeastern North China Craton (NCC). Rock magnetic investigations reveal magnetite and hematite as the main magnetic carriers. Characteristic remanent magnetization directions from 21 sites show normal and reversed polarities and site-mean directions pass fold tests. After inclination shallowing (IS) correction with the elongation/inclination method, a mean direction is calculated at D s /I s = 322.5°/39.5°(k s = 32.6, α 95s = 5.7°) in stratigraphic coordinates. The corresponding Early Triassic paleomagnetic pole (λ/φ = 53.5°N/9.5°E, A 95 = 5.3°) overlaps with coeval poles that have also been corrected for IS reported from the western part of the NCC. This result indicates that there is no relative movement between the eastern and western parts of the NCC. With all IS-corrected paleomagnetic poles, a mean Early Triassic pole is recalculated for the NCC at λ/φ = 59.4°N/ 13.4°E (A 95 = 4.7°). We use this pole to reconstruct the paleogeography of Proto-Asia and confirm previous studies that did not use IS corrections, in which two "triangle bay-shaped" oceans, the Paleo-Tethys Ocean and the Mongol-Okhotsk Ocean, existed along the southern and northern margins of the unified NCC-Mongolian Block (MOB). Clockwise rotations of the South China Craton and Siberia Craton relative to the NCC-MOB during the Early Mesozoic led to the final closure of both oceans.

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Section: 1029/2020jb019489supporting

confidence: 80%

An Inclination Shallowing‐Corrected Early Triassic Paleomagnetic Pole for the North China Craton: Implication for the Mesozoic Geography of Proto‐Asia

Zhao

Appel

2020

JGR Solid Earth

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“…Thus, collisions between North China and Central Asia Orogenic Belt or South China are several tens of million years earlier than the Yanshanian orogeny and may not serve to explain this multiple‐direction compression during the Late Jurassic and earliest Cretaceous across North China. A recent study (Yi & Meert, 2020) suggests that the collision between the Central Asia Orogenic Belt and the Siberia Block occurred during the Middle Jurassic. Although this continent‐continent collision more than 1,000 km north of the northern boundary of North China might contribute to the late Jurassic compression in North China and adjacent areas, it may not explain the observed multiple‐direction (particularly the E‐W direction) feature of this compression event.…”

Section: Introductionmentioning

confidence: 99%

Yanshanian Orogeny During North China's Drifting Away From the Trench: Implications of Numerical Models

et al. 2020

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Tectonics in North China and adjacent areas were dominated by the Pacific Plate subduction since the Jurassic. Although the extension-dominated tectonics in North China since the Early Cretaceous can be well explained by the Pacific Plate subduction, it is still not well understood why North China and adjacent areas underwent intense compression (Yanshanian orogeny) during the Late Jurassic and why these regions rapidly switched to extension-dominated tectonics during the Early Cretaceous. Plate reconstructions suggest that East Asia was moving rapidly in the direction opposite the trench during the Jurassic when North China was undergoing strong compressional deformation. This relationship between back-arc deformation and overriding plate's motion seems to contradict previous compilations and geodynamic models. We suggest that large-scale mantle convection and exotic terrane accretions along the East Asian margin have jointly contributed to the Yanshanian orogeny across North China during the Jurassic. We verify this hypothesis with numerical geodynamic models. Our numerical experiments also suggest that large-scale downwelling mantle flow beneath Asia has promoted continued subduction beneath the Asian margin despite the subduction was often punctuated by collisional and accretionary events.

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“…Another point of disagreement amongst Mesozoic reconstructions is the timing at which the Mongol‐Okhotsk Ocean (MOO) finally closed. The Y2019 reconstruction models this closure of the MOO to take place at around 130 Ma, but recent estimates span an ∼40 Myr range from Middle Jurassic (Yi & Meert, 2020) to lower Cretaceous (Ren et al., 2018) due to the conflicting interpretations between the paleomagnetic and geological records. The zircon data (Figure 2; Figures S6 and S7 in Supporting Information S1) show that category A samples are found within the region of the Amuria‐Siberia suture zone until 130 Ma, with category B and C samples occurring within the collision zone from 150 Ma.…”

Section: Discussionmentioning

confidence: 99%

Quantifying the Link Between the Detrital Zircon Record and Tectonic Settings

et al. 2022

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Full‐plate reconstructions describe the history of past continental motions and how plate boundaries have evolved to accommodate these motions. Traditionally, tectonic reconstructions relied on geophysical data from the oceans and paleomagnetism as the primary quantitative constraints. However, these data do not directly constrain the paths of subduction zones or other plate boundaries, so reconstructing the complete configurations of tectonic plates in the past must rely on alternative methods. Here, we investigate the applicability of detrital zircon age spectra to characterize tectonic settings in deep time using a much larger data set than previously considered. We analyzed the proximity between reconstructed plate boundaries and sample sites assigned to different tectonic categorizations based on the proportion of zircon ages close to the depositional age and found that the categorization has an ∼70% success rate in distinguishing convergent settings. Results are not strongly influenced by factors such as the number of zircon grains available within each detrital sample or uncertainty in the depositional age of the sample. The ability of the categorization to define extensional settings, such as rift basins, is less clear. Nonetheless, the broader pattern of results at the scale of Pangea shows that categorized zircon samples form a coherent pattern, where samples with dominantly young zircons lie at the supercontinent periphery while samples in the core of Pangea are dominated by grains much older than the age of deposition. This result suggests that zircon data could help to quantify uncertainties in full‐plate reconstructions and discriminate between competing models for Proterozoic supercontinents.

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A Closure of the Mongol‐Okhotsk Ocean by the Middle Jurassic: Reconciliation of Paleomagnetic and Geological Evidence

Cited by 55 publications

References 49 publications

An Inclination Shallowing‐Corrected Early Triassic Paleomagnetic Pole for the North China Craton: Implication for the Mesozoic Geography of Proto‐Asia

An Inclination Shallowing‐Corrected Early Triassic Paleomagnetic Pole for the North China Craton: Implication for the Mesozoic Geography of Proto‐Asia

Yanshanian Orogeny During North China's Drifting Away From the Trench: Implications of Numerical Models

Quantifying the Link Between the Detrital Zircon Record and Tectonic Settings

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