Middle Paleozoic intermediate-mafic rocks of the Tsoroidog Uul’ accretionary complex, Central Mongolia: Petrogenesis and tectonic implications

Lkhagvasuren, Dagva-Ochir; Oyunchimeg, Ts.; Enkhdalai, Batkhuyag; Safonova, Inna; Li, Huan; Otgonbaatar, D.; Tamehe, Landry Soh; Sharav, Davaanyam

doi:10.1016/j.lithos.2020.105795

Cited by 4 publications

(1 citation statement)

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“…The Khangay–Khentey terrane hosts all typical units of Ocean Plate Stratigraphy (OPS; from bottom to top): oceanic basalt (MORB, OIB), radiolarian pelagic chert, hemipelagic siliceous mudstone, siltstone, thick trench turbidite, and sandstone (e.g. Dagva‐Ochir et al, 2020; Safonova et al, 2009). The provenance analysis of sandstones and the U–Pb ages of detrital zircons show that the sediments of the northern part deposited from the Silurian to early Carboniferous times in a subduction–accretion setting, which apparently stopped in the Carboniferous.…”

Section: Geological Settingmentioning

confidence: 99%

Age, petrogenesis, and tectonic implications of the late Permian magmatic rocks in the Middle Gobi volcanoplutonic Belt, Mongolia

et al. 2022

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The Mongol-Okhotsk Belt, the youngest segment of Central Asian Orogenic Belt, was formed by the evolution and closure of the Mongol-Okhotsk Ocean. The oceanic closure formed two volcanoplutonic belts: Selenge Belt in the north and the Middle Gobi Belt in the south (in present day coordinates). However, the origin and tectonic evolution of the Mongol-Okhotsk Belt in general, and the origin and formation age of the Middle Gobi Belt in particular, remain enigmatic. To better understand the history of the magmatic activity in the Middle Gobi Belt, we conducted geochemical, U-Pb geochronological, zircon Hf, and whole-rock Nd isotopic analyses of samples from the Mandalgovi volcanoplutonic suite, the major component of the Middle Gobi Belt. Our results show that the plutonic rock consists of $285 Ma gabbro, $265 Ma biotite-granite and $250 Ma hornblende-granodiorite. The volcanic counterpart is represented by a Permian Sahalyn gol rhyolite and $247 Ma Ikh khad andesite. The geochemical compositions of biotite-granite and hornblende-granodiorite indicate that their precursors were metagraywacke and amphibolite, respectively. They are characterized by positive whole-rock ε Nd (t) and zircon ε Hf (t) values, indicating juvenile protoliths. The gabbro was derived by partial melting of a metasomatized lithospheric mantle source in a supra-subduction setting. The biotite-granite and Sahalyn gol

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Section: Geological Settingmentioning

confidence: 99%