Geological effects in tectonic superposition of Paleo-Pacific domain and Paleo-Asian domain in northern part of North China

Geochronology, geochemistry, and zircon Hf isotopes of the Mo‐bearing granitoids in the eastern Jilin‐Heilongjiang provinces, NE China: Petrogenesis and tectonic implications

“…Additionally, previous researches indicated that an active continental margin widely developed in the EJHP during the Permian time, which is evidenced by (a) the presence of the NNE‐oriented Permian intrusive rocks over the EJHP with geochemical affinities to an active continental margin (Cao, Xu, Pei, & Zhang, ; Fu, ; Jia et al, ; Kelemen, Hanghoj, & Greene, ; Wei et al, ; Wu et al, ; Yang et al, , ); (b) the Late Permian molasses recognized from the Kaishantun Group in the Yanbian area (Jia et al, ; Zhang, ; Zhou et al, ); and (c) the subduction‐related calc‐alkaline I‐type granitoids obtained from the northern margin of the North China Craton (Zhang, Zhao, Song, & Yang, ; Zhang et al, ). Although there is controversy surrounding where the Paleo‐Asian Ocean was located and when it closed (Miao et al, ; Shao, Mu, He, & Zhang, ; Sun, Wu, Li, & Lin, ; Wu et al, ), most researchers favor the interpretation that the Solonker–Xilamulun–Changchun Suture represents the final closure of the Paleo‐Asian Ocean between the North China and Siberia cratons and that it occurred during the Late Permian‐Middle Triassic (Liu et al, ; Sun et al, ; Wang, Sun, Li, Zhao, & Ma, ; Wu et al, ; Zhang et al, ). In addition, the presence of the Late Triassic mafic‐ultramafic intrusions along the Xilamulun suture zone (Wu, Wilde, Sun, & Zhang, ) and the coeval extensional granitic complex in the Jiamusi–Khanka Massif (Yang et al, , ) implies that the tectonic setting transit from active continental margin to extension in Late Triassic.…”

Present-day geothermal regime of the Uliastai Depression, Erlian Basin, North China

“…The Erlian Basin is located at the junction of the North China Plate and the Siberia Plate. It is a sedimentary fault basin which developed on the Hercynian fold basement in Mesozoic-Cenozoic (Pan et al., 2009; Qi et al., 2015; Shao et al., 1997). It has experienced continental accretion, intercontinental collision, and orogeny (Khain et al., 2002).…”

40Ar/39Ar dating, fluid inclusions and S–Pb isotope systematics of the Shabaosi gold deposit, Heilongjiang Province, China

“…In the Late Jurassic, widespread crustal extension occurred due to the gravitational collapse of the orogenically thickened crust, triggered by breakoff of the subducted oceanic slab and upwelling of the asthenosphere (Jahn et al, 2009;Ying et al, 2010). Because the Palaeo-Asian Ocean has been closed during the Permian (Pruner, 1987;Shao et al, 1997), the Mohe thrust-nappe belt, where the Shabaosi gold deposit was located, could not be related to the subduction and collision process of the Palaeo-Asian Ocean in the period, but was rather a product of the late-stage tectonic evolution of the Mongolia-Okhotsk Orogen . Because the Palaeo-Asian Ocean has been closed during the Permian (Pruner, 1987;Shao et al, 1997), the Mohe thrust-nappe belt, where the Shabaosi gold deposit was located, could not be related to the subduction and collision process of the Palaeo-Asian Ocean in the period, but was rather a product of the late-stage tectonic evolution of the Mongolia-Okhotsk Orogen .…”

“…Li et al (2004) obtained 40 Ar/ 39 Ar ages of 127-130 Ma from biotite found in the Mohe ductile shear belt, and noted that the peak activity of the ductile strike-slip tectonic belt of the northern Great Xing'an Range was in the Early Cretaceous. Because the Palaeo-Asian Ocean has been closed during the Permian (Pruner, 1987;Shao et al, 1997), the Mohe thrust-nappe belt, where the Shabaosi gold deposit was located, could not be related to the subduction and collision process of the Palaeo-Asian Ocean in the period, but was rather a product of the late-stage tectonic evolution of the Mongolia-Okhotsk Orogen . Wu et al (2009) showed that the East Luoguhe granitoid intrusion (130 Ma, Zircon SHRIMP U-Pb age) near the Shabaosi deposit was formed in the post-collisional regime of the Mongolia-Okhotsk Orogen and, particularly, in a transitional tectonic setting from compression to extension in the Early Cretaceous.…”