Upper Silurian and Devonian pelagic deep-water radiolarian chert from the Khangai–Khentei belt of Central Mongolia: Evidence for Middle Paleozoic subduction–accretion activity in the Central Asian Orogenic Belt

Kurihara, Toshiyuki; Tsukada, Kazuhiro; Otoh, Shigeru; Kashiwagi, Kenji; Minjin, Chuluun; Byambadash, Dorjsuren; Boijir, Bujinlkham; Gonchigdorj, Sersmaa; Nuramkhan, Manchuk; Niwa, Masakazu; Tokiwa, Tetsuya; Hikichi, Gen’ya; Kozuka, Takafumi

doi:10.1016/j.jseaes.2008.04.010

Cited by 59 publications

(54 citation statements)

References 64 publications

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“…1a, b;Petrov et al 2014). The SB belt is considered to be a collage of amalgamated blocks that have been accreted to the Siberian craton, while the HD belt is regarded as accretionary complexes with shelf facies rocks (e.g., Kurihara et al 2009;Tomurtogoo 2012Tomurtogoo , 2014Bulgatov and Gordienko 2014).…”

Section: Geologymentioning

confidence: 99%

“…The HD belt is largely composed of Cambrian-Ordovician proximal shallow marine sedimentary rocks and Paleozoic accretionary complexes (Tomurtogoo 2006(Tomurtogoo , 2012Kurihara et al 2009). The Paleozoic rocks of the HD belt are divided into the following nine geological units (Fig.…”

Section: Geologymentioning

confidence: 99%

“…The Ulaanbaatar terrane (late Devonian Early Carboniferous accretionary complex) is composed mainly of basalts, limestone, Silurian-Devonian radiolarian chert, siliceous mudstone, and clastic rocks (e.g., Kurihara et al 2009;Nakane et al 2012;Suzuki et al 2012;Takeuchi et al 2012;Tsukada et al 2013). The Ulaanbaatar, Harhorin, and Tsetserleg terranes are structurally and lithostratigraphically correlative (Kurihara et al 2009;Purevjav and Roser 2013;Tsukada et al 2013). The Asralt Hairhan terrane is considered to have a metamorphic affinity to the Ulaanbaatar terrane (e.g., Tomurtogoo 2012;Gordienko et al 2012).…”

Section: Geologymentioning

confidence: 99%

“…The bedding and structural planes in the Zag and Tsetserleg terranes generally trend northwest and steeply dip north-or southward, west of the HD belt (e.g., Badarch et al 2002;Buchan et al 2001;Purevjav and Roser 2013;Tsukada et al 2013), whereas those in the Haraa, Asralt Hairhan, Ulaanbaatar, Daur, and Aga terranes trend northeast and steeply dip northward in the east (e.g., Zorin 1999;Kurihara et al 2009;Takeuchi et al 2012). The rocks of the Harhorin terrane trend north-northwest and dip southwestwardly in fault contact with the Tsetserleg terrane in the west by the northwestwardly trending fault system (Fig.…”

Section: Geologymentioning

confidence: 99%

“…1b, Petrov et al 2014). The Paleozoic accretionary complexes (Kurihara et al 2009;Tomurtogoo 2012) in the HangaiDaur belt were formed by the northward subduction of the oceanic plate (Mongol Okhotsk oceanic plate; e.g., Tang et al 2016) beneath the SC (Zorin 1999;Donskaya et al 2013). The Mongol-Okhotsk Ocean was previously present between the SC and NCP/TB (Fig.…”

Section: Introductionmentioning

confidence: 99%

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Late Paleozoic low-angle southward-dipping thrust in the Züünharaa area, Mongolia: tectonic implications for the geological structures in the Sayan-Baikal and Hangai-Daur belts

Gantumur

Tsukada

2017

Int J Earth Sci (Geol Rundsch)

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low-angle southward-dipping thrusts, similar to the present study, are widely distributed in the Haraa terrane of the Hangai-Daur belt and in terranes of the Sayan-Baikal belt. Whereas, the contemporaneous southeast-verging composite folds and northward-dipping thrusts are developed in the accretionary complexes, which are exposed at south of the Haraa terrane. These contrasting structures suggest a couple of "landward-verging" and "oceanward-verging" structures and may correspond to the "doubly vergent asymmetric structure" of Alpine-type compressional orogen.

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Section: Geologymentioning

confidence: 99%

Section: Geologymentioning

confidence: 99%

Section: Geologymentioning

confidence: 99%

Section: Geologymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Late Paleozoic low-angle southward-dipping thrust in the Züünharaa area, Mongolia: tectonic implications for the geological structures in the Sayan-Baikal and Hangai-Daur belts

Gantumur

Tsukada

2017

Int J Earth Sci (Geol Rundsch)

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Absolute reconstruction of the closing of the Mongol‐Okhotsk Ocean in the Mesozoic elucidates the genesis of the slab geometry underneath Eurasia

Kravchinsky

et al. 2017

JGR Solid Earth

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Understanding the present‐day fast seismic velocity anomalies in the mantle requires an accurate kinematic reconstruction of past convergent tectonics. Using the paleomagnetism‐based absolute reconstruction method from Wu and Kravchinsky (2014), we present here the restoration of the closing of the Mongol‐Okhotsk Ocean (MOO) that existed between Siberia and North China‐Amuria (NCA) during the Mesozoic. Three stages, i.e., 250–200 Ma, 200–150 Ma, and 150–120 Ma, are identified from the time‐varying convergence rates of Siberia and NCA. The spherical distance between the suture margins was reduced by approximately 66.7% at an average convergence rate of 8.8 ± 0.6 cm/yr during the first stage at 250–200 Ma, when approximately 62.5–76.1% of the slabs associated with the MOO lithosphere were formed primarily through intraoceanic convergence. In the second stage at 200–150 Ma, the spherical distance was reduced by another 21.1% with a convergence rate of 3.6 ± 0.3 cm/yr. During this stage, approximately 14.2–30.9% of the MOO slabs were formed and continental‐oceanic convergence outpaced intraoceanic subduction. In the last stage at 150–120 Ma, the convergence rate dropped to approximately 0.4–0.6 cm/yr with the formation of approximately 4.6–9.8% slabs associated with the MOO lithosphere. The final closure of the remnant MOO basin could have been accomplished by 130–120 Ma, which explains the origin of the fast‐velocity anomalies inside the restored continents at 120 Ma near the suture margins.

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The Late Carboniferous Khuhu Davaa ophiolite in northeastern Mongolia: Implications for the tectonic evolution of the Mongol–Okhotsk Ocean

et al. 2017

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The newly discovered Khuhu Davaa ophiolite is located in the Adaatsag suture zone, which marks the closure of the Mongol–Okhotsk Ocean in northeastern Mongolia. In this paper, we present new geochemical and SIMS zircon U–Pb data for the ophiolite to provide some constraints on the tectonic evolution of the Mongol–Okhotsk orogenic belt. Metagabbro and plagiogranite samples from the ophiolite yielded SIMS zircon U–Pb ages of 321 ± 4 Ma and 314 ± 3 Ma, respectively, which are interpreted to represent the formation age of the ophiolite. These data suggest that the Carboniferous Khuhu Davaa ophiolite is likely related to the contemporaneous Adaatsag ophiolite to the southwest, defining the suture zone of the Mongol–Okhotsk Ocean in northeastern Mongolia. Tholeiitic basalt samples from the ophiolite show N‐MORB and E‐MORB geochemical affinities but are enriched in Ba, Pb, and Sr, which may reflect an input of subduction‐related fluids. Metagabbro samples exhibit HSFE depletion and LILE enrichment, which are diagnostic geochemical features of arc magmatism. Plagiogranites with low TiO2 contents appear to have formed through partial melting rather than fractional crystallization of a mafic crust in the subduction zone environment. Thus, we suggest that the Khuhu Davaa ophiolite resulted from generation of oceanic crust during the closure of the Mongol–Okhotsk Ocean and documents the initiation of subduction during the Late Carboniferous in northeastern Mongolia.

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Upper Silurian and Devonian pelagic deep-water radiolarian chert from the Khangai–Khentei belt of Central Mongolia: Evidence for Middle Paleozoic subduction–accretion activity in the Central Asian Orogenic Belt

Cited by 59 publications

References 64 publications

Late Paleozoic low-angle southward-dipping thrust in the Züünharaa area, Mongolia: tectonic implications for the geological structures in the Sayan-Baikal and Hangai-Daur belts

Late Paleozoic low-angle southward-dipping thrust in the Züünharaa area, Mongolia: tectonic implications for the geological structures in the Sayan-Baikal and Hangai-Daur belts

Absolute reconstruction of the closing of the Mongol‐Okhotsk Ocean in the Mesozoic elucidates the genesis of the slab geometry underneath Eurasia

The Late Carboniferous Khuhu Davaa ophiolite in northeastern Mongolia: Implications for the tectonic evolution of the Mongol–Okhotsk Ocean

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