Ancient mantle lithosphere beneath the Khanka massif in the Russian Far East: in situ Re–Os evidence

Abstract

The Os-isotope compositions of sulphides in mantle xenoliths hosted by Late Miocene alkali basalts from the Sviyaginsky volcano, Russian Far East, reveal the presence of Archaean-Proterozoic subcontinental lithospheric mantle beneath the Khanka massif. Their T MA and T RD model ages reveal similar peaks at 1.1 and 0.8 Ga suggesting later thermotectonic events in the subcontinental lithospheric mantle, whereas T RD model ages range back to 2.8 AE 0.5 (2r) Ga. The events recognized in the subcontinental lithospheric mantle are consistent with those recorded in the crust of the Khanka massif.The sulphide Os-isotope data show that the subcontinental lithospheric mantle beneath the Khanka massif had formed at least by the Mesoproterozoic, and was subsequently metasomatized by juvenile crustal-growth events related to the evolution of the Altaids. The Khanka massif is further proposed to have tectonic affinity to the Siberia Craton and should originate from it accordingly.

Bureya-Jiamusi Superterrane: Tectonic and Geodynamic Processes in Late Mesozoic - Cenozoic

“…According to the findings of macro-and micro-palaeoflora from the tuff-terrigenous part of the section of the cover part of the complex, the time interval might be stated as the end of Jurassic-Hauterivian [16]. The age of the volcanites of the Itikut complex is 135-136 Myr ( 40 Ar/ 39 Ar method) [37] by the geochronological data. According to these data, the time of the Itikut complex rocks formation was accepted as the end of the Jurassic-135 Myr.…”

“…But the authors state that these formations are the analog of Burunda volcano-plutonic island-arc complex. The age interval of formation for the magmatites of Burunda complex is stated by the precision ( 40 Ar/ 39 Ar, Rb-Sr) methods as 111-105 Myr [5].…”

“…They are depleted in Ba and Sr. and are enriched in Rb, Th, Nb, Hf, and Zr. The age of the volcanites determined by the 40 Ar / 39 Ar method is 99-101 Myr [8,36], which corresponds to the alb.…”

“…One of the most difficult and debatable structures of the region is Bureya-Jiamusi superterrane. A significant part of the superterrane body is situated in the territory of China, where it is actively studied by the scientists of the country [2,12,14,19,20,39,42,[44][45][46][47].…”

“…But there are also other ideas of the location of the Bureya-Jiamusi superterrane (Figure 1). According to the idea, the spreading of the superterrane formations is significantly limited in the southwest direction [2,12,14,20,39,40]. The author of the suggested article attempts to analyze the geodynamic processes in late Mesozoic-Cenozoic time, which could affect the structure-tectonical formation of Bureya-Jiamusi superterrane.…”