Was Permian magmatism in the eastern Songnen and western Jiamusi massifs, NE China, related to the subduction of the Mudanjiang oceanic plate?

Abstract

This paper presents new zircon U–Pb ages and Hf isotope data, and whole‐rock major and trace element geochemical data of Permian igneous rocks from the eastern Songnen Massif (SM) and the western Jiamusi Massif (JM), NE China, to constrain their tectonic evolution. Zircon U–Pb dating indicates that Permian magmatism within the eastern SM can be subdivided into two stages: early Permian (ca. 293 Ma) and middle to late Permian (272–257 Ma). The early Permian igneous rocks comprise a bimodal association of rhyolites, basaltic andesites, and gabbros. The middle to late Permian igneous rocks are dominated by gabbro–diorites, monzodiorites, quartz diorites, monzonites, quartz monzonites, granodiorites, monzogranites, syenogranites, and alkali feldspar granites, along with minor bodies of A‐type quartz trachytes. The Permian felsic magmas originated mainly from partial melting of a relatively juvenile lower crust, whereas the coeval mafic rocks were probably derived from partial melting of a relatively depleted lithospheric mantle that was modified by fossil subduction‐related fluids. The igneous rock associations and their geochemical features, together with data from coeval sedimentary and volcanosedimentary successions, indicate that Permian magmatism within the eastern Songnen and western Jiamusi massifs formed in an extensional environment, similar to a back‐arc setting, related to westward subduction of a Palaeo‐oceanic plate beneath the eastern margin of the Jiamusi Massif. We find no evidence for double‐sided subduction of the Mudanjiang oceanic plate during the Permian.

Geochemistry and Zircon U-Pb-Hf Isotopes of Metamorphic Rocks from the Kaiyuan and Hulan Tectonic Mélanges, NE China: Implications for the Tectonic Evolution of the Paleo-Asian and Mudanjiang Oceans

“…Recent studies suggest that the late Paleozoic-early Mesozoic tectonic evolution between the Jiamusi and Songnen blocks was related to the development of the MO [55][56][57][58][59][60][61][62][63][64][65][66][67][68]; however, the formation time of the ocean is still ambiguous, as this region is overprinted by several Paleozoic to Mesozoic Paleo-Asian and circum-Pacific tectonic regimes [23,24,26,39,42,46,69,76]. A number of studies suggest that the ocean existed during the Permian [55][56][57].…”

“…A number of studies suggest that the ocean existed during the Permian [55][56][57]. In contrast, some researchers have recently proposed that the MO was a short-lived ocean that existed during the Middle Triassic-Early Jurassic [62].…”

“…While estimates of timing vary from pre-Late Devonian [31][32][33] through the Early-Middle Permian [34] to the Late Permian-Middle Triassic or even later [35][36][37][38][39][40][41][42][43][44][45][46][47][48][49][50][51][52][53][54], there continues to be ambiguity as to whether subduction occurred via a bidirectional [40][41][42][44][45][46] or single-sided southward [36,37] subduction geometry. Furthermore, increasing evidence indicates that the Mudanjiang Ocean (MO), which was between the Songnen and Jiamusi blocks, participated in the tectonic evolution of NE China during the Late Permian to Mesozoic [55][56][57][58][59][60][61][62][63][64][65][66][67][68]. Therefore, some researchers recently proposed that the CYS is the southern margin of the Jilin-...…”

Accretionary tectonics, deep structures and metallogeny of southern Altaids

“…In the research conducted by Long, Xu, Guo, Sun and Luan (, this issue), a Permian extensional environment related to westward subduction of a Palaeo‐oceanic plate beneath the eastern margin of the Jiamusi Massif (JM) is firstly identified in the eastern Songnen and western JMs, based on newly obtained zircon U–Pb ages and Hf isotope data, and whole‐rock major and trace element geochemical data from Permian igneous rocks of the eastern Songnen Massif and the western JM, NE China.…”

Two mineralization events in the Laozuoshan Au deposit, north‐east China: Evidence from Re–Os geochronology and trace element geochemistry

“…Finally, we define two gold mineralization events in the Laozuoshan deposit and correlate the gold mineralization with F I G U R E 1 (a)Tectonic division of NE China (modified from Liu et al, 2017), showing the major blocks, sutures, faults, and the location of (b). S1: Xinlin-Xiguitu Suture, S2: Hegenshan-Heihe Suture, S3: Mudanjiang-Yilan Suture, S4: Xar Moron-Changchun-Yanji Suture, F1: Derbugan Fault, F2: Nenjiang-Balihan Fault, F3: Songliao Basin Central Fault, F4: Jiamusi-Yilan Fault, F5: Dunhua-Mishan Fault, F6: Yuejinshan Fault, F7: Chifeng-Kaiyuan Fault; (b) Simplified geological map of the Jiamusi Block and surrounding areas (modified after Long, Xu, Guo, Sun, &Luan, 2020); (c) Distribution of gold deposits in the eastern part of NE China [Colour figure can be viewed at wileyonlinelibrary.com] regional tectonomagmatic processes, which may have implications for future gold exploration in the area.…”