Timing of closure of the eastern Mongol–Okhotsk Ocean: Constraints from U–Pb and Hf isotopic data of detrital zircons from metasediments along the Dzhagdy Transect

Сорокин, А. А.; Zaika, V. A.; Ковач, В. П.; Kotov, A. B.; Xu, Wen‐Liang; Yang, Hao

doi:10.1016/j.gr.2019.11.009

Cited by 97 publications

(40 citation statements)

References 86 publications

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“…A binary provenance signal is observed in clastic material deposited on the eastern segment of the Mongol‐Okhotsk belt. That material was supplied from both the southern margin of Siberian Craton and the Amur block during the Early to Middle Jurassic, suggesting that the size of the oceanic basin was negligible (Sorokin et al, 2020). The youngest zircons from several metasandstone sequences in the eastern part of the Mongol‐Okhotsk belt are 171–173 Ma, indicating that sedimentation in the eastern part of the Mongol‐Okhotsk oceanic basin continued until the beginning of the Middle Jurassic (Sorokin et al, 2020).…”

Section: Analysis and Discussionmentioning

confidence: 99%

“…There is a mismatch between the paleomagnetic data and geology‐based models because they suggest vastly different ages for closure of the MOO (Kravchinsky, Sorokin, et al, 2002). Most geological data suggest a closure of the western segment of the suture zone in the Late Triassic or Early Jurassic (e.g., Donskaya et al, 2013; Zonenshain, 1990; Zorin, 1999) followed by a slightly younger closure age for the eastern segment near the Early/Middle Jurassic boundary (~174 Ma) (e.g., Sorokin et al, 2020; Tomurtogoo et al, 2005). Others have argued for a Late Jurassic to Early Cretaceous age for the easternmost part of the suture (Halim et al, 1998; Maruyama et al, 1997; Zonenshain, 1990).…”

Section: Introductionmentioning

confidence: 99%

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

Meert

2020

Geophysical Research Letters

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The late Mesozoic closure of the Mongol‐Okhotsk Ocean (MOO) is critical for understanding the tectonics of East Asia. There is a considerable mismatch (~40 million years) between the timing of MOO closure based on paleomagnetic data and geological evidence. We review paleomagnetic data from Mongolia, Siberia, and North China and argue that previously published apparent polar wander paths (APWPs) for North China and Siberia are insufficient to constrain the timing of MOO closure. Our new analysis incorporates newly published paleomagnetic data from North China and a refined geochronology for the key Siberian poles. We combine this with an updated global APWP incorporating large‐scale Jurassic true polar wander and argue that the MOO was closed by the Middle Jurassic. This temporal shift is compatible with geology‐based models. The Middle Jurassic reconstruction of Eurasia suggests that the East Asian blocks had become a quasi‐rigid part of Pangea prior to breakup.

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Section: Analysis and Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

Meert

2020

Geophysical Research Letters

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“…These authors suggest that the Kherlen suture formed coevally and similarly with the Bayanhongor belt. Thus, this finding implies that the Baydrag and the Idermeg terranes during the Palaeozoic represented a common continental passive margin block related to the opening of the Mongol-Okhotsk Ocean [24,41].…”

Section: Adaatsag Terranementioning

confidence: 65%

“…Depending on scopes, scales and methods applied, numerous studies of the area exist, which use different terrane names, but mostly rely on Badarch et al [10]. We also aim for the most accurate possible correlation of the Mongolian terranes with the established tectonic-stratigraphic units in China and Russia [6,8,14,[37][38][39][40][41][42] with our results. The doubled Kipchak-arc model ( [33,42]), and references therein) was modified during the last decades towards a model inferring the time-stepped closure of oceanic basins within the larger Palaeo-Asian Ocean driven by the collision of continental basement with arc complexes and suturing [1,6,9,[43][44][45][46].…”

Section: Geological Framework Of Central and Southeastern Mongoliamentioning

confidence: 92%

Detrital Zircon Provenance Analysis in the Central Asian Orogenic Belt of Central and Southeastern Mongolia—A Palaeotectonic Model for the Mongolian Collage

et al. 2020

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Our study is aimed at reconstructing the Palaeozoic–early Mesozoic plate tectonic development of the Central Asian Orogenic Belt in central and southeast Mongolia (Gobi). We use sandstone provenance signatures including laser ablation U-Pb ages of detrital zircons, their epsilon hafnium isotope signatures, and detrital framework grain analyses. We adopt a well-established terran subdivision of central and southeastern Mongolia. However, according to their affinity and tectonic assemblage we group them into three larger units consisting of continental basement, rift-passive continental margin and arc elements, respectively. These are in today’s coordinates: (i) in the north the late Cambrian collage from which the later Mongol-Okhotsk and the Central Mongolia-Erguna mountain ranges resulted, (ii) in the south a heterogeneous block from which the South Mongolia-Xin’gan and Inner Mongolia-Xilin belts developed, and (iii) in between we still distinguish the intra-oceanic volcanic arc of the Gurvansayhan terrane. We present a model for paleotectonic development for the period from Cambrian to Jurassic, which also integrates findings from the Central Asian Orogenic Belt in China and Russia. This mobilistic model implies an interplay of rift and drift processes, ocean formation, oceanic subduction, basin inversion, collision and suture formation in space and time. The final assemblage of the Central Asian Orogenic Belt occurred in Early Jurassic.

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“…The Mesozoic stage was characterized by a wide diversity of alkaline rocks with ultramafic to silica-rich compositions, which form large massifs of complex composition, ring volcanic-plutonic complexes, dykes, diatremes, subvolcanic bodies, laccoliths. It is believed that the stage of Mesozoic igneous activity was triggered by the global tectonic events related to the final closure of the Mongol-Okhotsk Ocean south of the Aldan shield [10,36].…”

Section: Geological Backgroundmentioning

confidence: 99%

40Ar/39Ar Geochronology and New Mineralogical and Geochemical Data from Lamprophyres of Chompolo Field (South Yakutia, Russia)

et al. 2020

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The alkaline igneous rocks of the Chompolo field (Aldan shield, Siberian craton), previously defined as kimberlites or lamproites, are more correctly classified as low-Ti lamprophyres. The emplacement age of the Ogonek pipe (137.8 ± 1.2 Ma) and the Aldanskaya dike (157.0 ± 1.6 Ma) was obtained using 40Ar/39Ar K-richterite dating. The Chompolo rocks contain abundant xenocrysts of mantle minerals (chromium-rich pyropic garnets, Cr-diopsides, spinels, etc.). The composition of the mantle xenocrysts indicates the predominance of spinel and garnet–spinel lherzolites, while the presence of garnet lherzolites, dunites, harzburgites, and eclogites is minor. The Chompolo rocks are characterized by large-ion lithophile element (LILE) and Light Rare Earth Element (LREE) enrichments, and high field strength element (HFSE) depletions. The rocks of the Ogonek pipe have radiogenic Sr (87Sr/86Sr (t) = 0.70775 and 0.70954), and highly unradiogenic εNd(t) (−20.03 and −20.44) isotopic composition. The trace element and isotopic characteristics of the Chompolo rocks are indicative of the involvement of subducted materials in their ancient enriched lithospheric mantle source. The Chompolo rocks were formed at the stage when the Mesozoic igneous activity was triggered by global tectonic events. The Chompolo field of alkaline magmatism is one of the few available geological objects, which provides the opportunity to investigate the subcontinental lithospheric mantle beneath the south part of the Siberian craton.

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Timing of closure of the eastern Mongol–Okhotsk Ocean: Constraints from U–Pb and Hf isotopic data of detrital zircons from metasediments along the Dzhagdy Transect

Cited by 97 publications

References 86 publications

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

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

Detrital Zircon Provenance Analysis in the Central Asian Orogenic Belt of Central and Southeastern Mongolia—A Palaeotectonic Model for the Mongolian Collage

40Ar/39Ar Geochronology and New Mineralogical and Geochemical Data from Lamprophyres of Chompolo Field (South Yakutia, Russia)

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