From Rodinian passive margin to peri-Siberian continental arc: Evidence from the multiphase Neoproterozoic–early Paleozoic magmatic record of the Zavkhan Block in the Mongolian Collage

Crustal Structures From Receiver Functions and Gravity Modeling in Central Mongolia

“…In the southern part, the LVLDZs may constitute the remnants of the batholiths resulting from the early Tonian or the Cambro–Ordovician continental magmatic arc (Figure 13) or may result from late Tonian anatexis processes due to the extension during the break‐up of Rodinia that would have affected southern Baydrag. However, this late Tonian extension related to the break‐up of Rodinia was identified in all the other Precambrian microcontinents in the Mongolian collage except in Baydrag (Soejono et al., 2023). Thus, we rather assume the hypothesis of remnants of batholiths, which can partly trigger the alternation of high velocity‐high density layers with low‐velocity/low‐density layers at the crustal scale, as it was demonstrated in the Archean Karelia and Kola provinces, where the acoustic transparent regions and low seismic reflection zone were interpreted as fragments of batholiths (Kostyuchenko et al., 2006; Mints et al., 2020).…”

“…Geological investigations leading to a geodynamic reconstruction of the Baydrag microcontinent are rather scarce, particularly in its southern part due to the occurrence of the Cenozoic sedimentary basin, which conceals the Proterozoic and Paleozoic tectonic units. Thus, the tectonic interpretation of the Baydrag southern margin mostly comes from an assumed continuation of the tectonic trends from the Zavkhan southern margin (Soejono et al., 2023), as it belongs to the Precambrian microcontinent belts located in the center of the Mongolian collage. Nevertheless, studies converge with the probability of contrasting geodynamics affecting the northern and southern Baydrag microcontinent.…”

“…This event is followed by the late Tonian thickening of a back‐arc or arc domain due to the subduction advancing system. The southern part comprises a succession of a Tonian magmatic arc related to the subduction of the Mirovoi Ocean beneath Rodinia, followed by a Cambro–Ordovician continental magmatic arc related to the subduction of the Paleo‐Pacific Ocean beneath Gondwana (Buriánek et al., 2017; Soejono et al., 2023). This Cambro‐Ordovician magmatic event is not observed in the northern part.…”

“…At the western and northern periphery of our studied area stand, respectively, the Zavkhan and the Tarvagatay Precambrian microcontinents, which constitute the continuation of the Baydrag microcontinents. The Zavkhan microcontinent is also characterized by Proterozoic high‐grade igneous rocks and Neoproterozoic to Carboniferous metasediments and sediments (Bold et al., 2016; Kozakov et al., 2014; Soejono et al., 2023) and as well as for the Tarvagatay (Badarch et al., 2002; Kozakov et al., 2011; Kröner et al., 2014). The Cambro‐Ordovician Ikh‐Mongol Arc developed at the southern continental margin of Baydrag and constitutes a part of the LZ (Janoušek et al., 2018).…”

Mongolian micro‐continental blocks in Columbia/Nuna: Zircon U–Pb–Hf isotopic evidence for long‐lasting Mongolia–Western Siberia connection

“…Zircon population 5 is associated with Tonian metamorphism, as documented also from monazite petrochronological data by Štípská et al (2023). Demoux, Kröner, Liu, et al, 2009;Donskaya et al, 2017;Feng et al, 2022;Jian et al, 2010;Kovach et al, 2013Kovach et al, , 2021Kozakov et al, 1997Kozakov et al, , 2011Kozakov et al, , 2012Kröner et al, 2014Kröner et al, , 2015Kröner et al, , 2017Soejono et al, 2023). [Colour figure can be viewed at wileyonlinelibrary.com]…”