A Triassic-Jurassic westward scissor-like subduction history of the Mudanjiang Ocean and amalgamation of the Jiamusi Block in NE China: Constraints from whole-rock geochemistry and zircon U-Pb and Lu-Hf isotopes of the Lesser Xing'an-Zhangguangcai Range granitoids

Zircon U–Pb dating and whole‐rock geochemistry of volcanic rocks in eastern Heilongjiang Province, NE China: Implications for the tectonic evolution of the Mudanjiang and Paleo‐Pacific oceans from the Jurassic to Cretaceous

“…However, it can be identified in the intrusive rocks in the Lesser Xing'an‐Zhangguangcai Range, which are coeval and show geochemical similarities with the volcanic rocks. For example, mafic enclaves were extensively observed in both the north and south areas, adjacent to the sample locations in this study (Ge et al, ; Ge et al, ). The boundaries between the enclaves and granitoids are not distinct, indicating the mixing between mafic and felsic magma was important.…”

“…In our sample location, the basaltic rocks cover the Early Jurassic granitoids (ca. 193 Ma; Ge, Zhang, Li, & Liu, ). To the east, the basaltic rocks are covered by Early Cretaceous strata.…”

Structures, strain analyses, and 40Ar/39Ar ages of blueschist‐bearing Heilongjiang Complex (NE China): Implications for the Mesozoic tectonic evolution of NE China

“…The new structural data have therefore major implications on the tectonic significance of the high‐pressure Heilongjiang Complex in particular the transition from E‐W Pacific‐type tectonic regime to N‐S dominated shortening related to closure of Mongol‐Okhotsk Ocean. Recent papers considered that the docking between the Jiamusi and Songliao blocks occurred during the latest Triassic to early Jurassic (Dong et al, , ; Zhou et al, , ; Zhou & Li, ) or after Late Jurassic (Ge et al, , , ; Zhu et al, ; Zhu, Zhao, Sun, Eizenhöfer, Liu, et al, ; Zhu, Zhao, Ji, et al, ; Zhu, Zhao, Sun, Han, et al, ; Zhu, Zhao, Sun, Eizenhöfer, Han, et al, ), by a westward oblique accretion of microblocks and closure of intervening basins related to the Paleo‐Pacific Plate subduction. This tectonic scenario can be modified due to above‐presented results showing a massive D3 N‐S‐directed shortening and associated large scale folding/transposition of subduction wedge.…”

“…Other studies proposed that a big ocean existed between the Songliao and Jiamusi blocks at least since the early Permian with a subduction occurring from 275 Ma to 141 Ma. During this period, the oceanic basin named “Mudanjiang Ocean” was closed from south to north in an oblique convergence, resulting in the development of left‐lateral movements along the suture zone related to the anticlockwise rotation of the Jiamusi‐Bureya‐Khanka Block (Ge et al, , ; Ge, Zhang, Li, & Liu, ). In contrast, recent Permian palaeogeography reconstructions of the eastern CAOB from the palaeomagnetic analysis of volcanic rocks suggest that the Jiamusi‐Bureya‐Khanka Block was already attached to the Songliao Block at 310 Ma (Zhang et al, ).…”

“…The main magmatic event, recorded by U‐Pb dating on zircons along the Zhangguancai Range occurred between 224 Ma and 163 Ma (Wu et al, , Ge et al, , Zhu et al, 2017d). Recent U‐Pb dating on zircons suggesting that the subduction of the Mudanjiang Ocean was initiated in the south at 275 Ma and then progressively expanded to the north until 141 Ma (Ge et al, ). Some authors propose a post‐collisional setting related to the closure of the Paleo‐Asian Ocean (Xu et al, ), while others propose a subduction setting related to the subduction of the Paleo‐Pacific Ocean (Wu et al, ; Yang, Ge, Zhao, Yu, & Zhang, ).…”