Geochronology and geochemistry of the Triassic bimodal volcanic rocks and coeval A-type granites of the Olzit area, Middle Mongolia: Implications for the tectonic evolution of Mongol–Okhotsk Ocean

Deformation patterns and timing of the thrust‐nappe structures in the Mohe Formation in Mohe Basin, Northeast China: Implication of the closure timing of Mongol–Okhotsk Ocean

“…Schematic reconstructions and regional tectonic evolution model of NE China and surrounding regions during Mesozoic showing precollisional and collisional settings (modified after Ren et al, ; Zhu et al, ; Tang et al, ). See text for explanation.…”

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

“…Along the northern margin, calc‐alkaline granitoids intruded above a normal‐angle subducted slab, whereas alkaline granitoids and bimodal lavas formed under extensional conditions above a broken slab (Donskaya et al, ). Along the southern margin, the Olzit Late Triassic bimodal volcanic rocks together with coeval A‐type granites likely represent a back‐arc basin extensional environment, which may have been related to the roll‐back of the Mongol–Okhotsk oceanic plate during the southward subduction (Zhu et al, ).…”

“…Based on the obtained U-Pb zircon age data for the trench-fill turbidite sediments of the Hangay-Hentey accretionary wedge, the drowned seamount should have reached to the northern trench during back-arc basin extensional environment, which may have been related to the roll-back of the Mongol-Okhotsk oceanic plate during the southward subduction (Zhu et al, 2016).…”

“…The suture zone is represented by the Adaatsag ophiolite in Mongolia and the Onon island arc, which is associated with Devonian–Carboniferous marine turbidites (Aga terrane) in Siberia (Parfenov, Popeko, & Tomurtogoo, ; Zorin, ), and is the result of the collision of the continental Amurian superterrane with the Siberian Craton (Natal'in, ; Parfenov, Bulgatov, & Gordienko, ; Parfenov et al, ). Although numerous studies have been conducted over the past few years, including paleomagnetic, biostratigraphical, geochronological, and geochemical analyses (Bussien, Gombojav, Winkler, & von Quadt, ; Donskaya, Gladkochub, Mazukabzov, & Ivanov, ; Fritzell, Bull, & Shephard, ; Metelkin, Gordienko, & Klimuk, ; Van der Voo, van Hinsbergen, Domeier, Spakman, & Torsvik, ; Zhu et al, ), the geodynamic evolution of the Mongol–Okhotsk Ocean has remained an enigmatic problem (Tomurtogoo, Windley, Kroner, Badarch, & Liu, ; Zorin, ). In particular, the ophiolites that occur in the suture zone are poorly studied, which has limited our understanding of the tectonic evolution of the Mongol–Okhotsk Ocean.…”

Permian lateral crustal growth and reworking along the Solonker suture zone (North China) constrained by high εHf(t) igneous rocks

“…As aforementioned in the first section, different closure ages have been proposed for the PAO. However, various Triassic mantle‐, crust‐ and slab‐derived rocks have been found recently along the Solonker suture zone, such as bimodal igneous rocks (Guo et al, ; Zhu et al, ), A‐type (Shi et al, ; Zhang, Zhang, Tang, & Liu, ), S‐type and I‐type granites (Li, Chung, et al, ), gabbro (Guo et al, ) and adakitic rocks (Liu et al, ; Wang et al, ), suggesting Triassic final closure for the PAO. Thus, it seems impossible for the Permian rhyolite, granodiorite and diorite to be generated in a post‐collisional setting.…”