Geochronological and geochemical constraints on the Erguna massif basement, NE China – subduction history of the Mongol–Okhotsk oceanic crust

Dong, Sun; Gou, Jun; Tian-hao, Wang; Ren, Yunsheng; Liu, Yongjiang; Guo, Huajun; Liu, Xiaoming; Hu, Zhaochu

doi:10.1080/00206814.2013.804664

Cited by 148 publications

(75 citation statements)

References 29 publications

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“…The ~1587 km latitudinal plate convergence between Siberia and the AMU‐NCB probably ended by ~130 Ma (Figure a). This important event not only represents the complete closure of the Mongol‐Okhotsk Ocean to form a northeast‐trending suture, but also indicates that the intense collisional compression within the Mongol‐Okhotsk tectonic domain was beginning to transform into post‐collisional extension, which was represented by the widespread development of rift basins (Figure c; Meng et al, ; Metelkin et al, ; Y. T. Yang et al, ), post‐orogenic A‐type granitoids (Figures b and c; Sun et al, ; T. Wang et al, ) and metamorphic core complexes (Figures b and c; Daoudene et al, , ; Donskaya et al, ; Meng, ; Sklyarov et al, , ) on both sides of the MOS. The regional extension in the Mongol‐Okhotsk tectonic domain was probably related to upwelling of asthenospheric material as a result of the post orogenic collapse or delamination of a thickened crust (Figure c), as suggested by the widespread nature of A‐type volcanoplutonic rocks (Donskaya et al, ; Sun et al, ; Tang et al, ; T. Wang et al, ).…”

Section: Discussionmentioning

confidence: 99%

“…For example, marine strata are exposed on the eastern MOS (e.g., the Mohe Basin; Guo et al, ; Zonenshain et al, ); some Late Jurassic subducted‐related basaltic lavas in the Transbaikalia area (Figures b and b; Andryushchenko et al, ; Vorontsov et al, ) suggest that the northward subduction of the oceanic slab was continuing at that time; and seismic tomography analysis indicated that Late Jurassic Mongol‐Okhotsk oceanic slab remnants remained beneath the Siberian margin (Van der Voo et al, , ; Wu, Kravchinsky, Gu, et al, ). Although researchers have reported some Late Jurassic A‐type volcanoplutonic rocks (with negative Eu anomalies and high alkaline contents) near the Manzhouli area (e.g., Sun et al, ; Tang et al, ; W. L. Xu et al, ), these magmatic rocks are only locally distributed near the eastern “Onon arc” zone (Figure b). And analysis of the geochemical characteristics indicates that the primary magma that formed the Late Jurassic A‐type granitoid was probably derived from the partial melting of a delaminated region of the lower crust (Tang et al, ).…”

Section: Discussionmentioning

confidence: 99%

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New Late Jurassic to Early Cretaceous Paleomagnetic Results From North China and Southern Mongolia and Their Implications for the Evolution of the Mongol‐Okhotsk Suture

Ren

Zhang

et al. 2018

JGR Solid Earth

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To better constrain the evolution of the Mongol‐Okhotsk suture, we carried out new paleomagnetic studies on Sharilyn Formation (~155 Ma) and Tsagantsav Formation (~130 Ma) in southern Mongolia, Amuria Block (AMU), and Tuchengzi Formation (~140 Ma) and Dadianzi/Yixian Formation (~130 Ma) in the Yanshan belt, North China Block (NCB). A total of 719 collected samples (from 100 sites) were subjected to stepwise thermal demagnetization. After a low‐temperature component of viscous magnetic remanence acquired in the recent field was removed, the stable high‐temperature components were isolated from most samples. The high‐temperature components from each rock unit passed a fold test and a reversal test, indicating their primary origins. The corresponding paleomagnetic poles were thus calculated. For AMU, the ~155 Ma pole is at 74.7°N/232.5°E (A95 = 3.7°), the ~130 Ma pole at 74.6°N/194.7°E (A95 = 2.9°); for the NCB, the ~140 Ma pole is at 82.7°N/208.6°E (A95 = 4.3°), the ~130 Ma pole at 80.5°N/197.4°E (A95 = 2.3°). By combining our new results with the published data, we refined the 155–100 Ma segment of the apparent polar wander paths for AMU and NCB, which can demonstrate that these two blocks have been tectonically coherent (AMU‐NCB) during 155–100 Ma. Comparison of the apparent polar wander paths, however, revealed a latitudinal plate convergence of 14.3° ± 6.9° and ~19.0° relative rotation between Siberia and the AMU‐NCB after ~155 Ma. Large‐scale latitudinal convergence likely ceased by ~130 Ma, although some relative rotation between them continued along the Mongol‐Okhotsk suture until ~100 Ma.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

New Late Jurassic to Early Cretaceous Paleomagnetic Results From North China and Southern Mongolia and Their Implications for the Evolution of the Mongol‐Okhotsk Suture

Ren

Zhang

et al. 2018

JGR Solid Earth

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“…Outcrops of Late Triassic granitoids are more extensive in the central GXR than in the EB (Figure ). Late Triassic granitoids were emplaced between 238 Ma and 201 Ma in the EB (Y. Li, Xu, Wang, Tang et al, ; Mi et al, ; C. Sun, Tang, Xu, Li, & Zhao, ; D. Sun et al, ; J. Tang et al, , ) and between 236 Ma and 206 Ma in the central GXR (namely, central XB) (X. Liu et al, ; Shi et al, ; H. Yang et al, ) (Figure ). In other parts of the XB, coeval magmatism is evidenced by 225–223 Ma volcanic rocks and a ca 208 Ma felsic dike in the Handaqi and Xintian areas, northern GXR (Y. Li, Xu, Wang, Tang, et al, ).…”

Section: Discussionmentioning

confidence: 99%

Geochronology, petrogenesis, and tectonic setting of Late Triassic volcanic rocks of the Hadataolegai Formation, central Great Xing'an Range, Northeast China

et al. 2018

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In this study, new geochemical, zircon U–Pb, and Lu–Hf isotopic data are presented for volcanics from the Hadataolegai Formation of the central Great Xing'an Range (GXR) in Northeast China. These new data offer insights into the petrogenesis of the volcanics of the Hadataolegai Formation and the tectonic evolution of the Paleo–Asian Ocean (PAO) and Mongol–Okhotsk Ocean (MOO). These volcanics of the Hadataolegai Formation are divided into andesite‐trachyandesites and dacite‐trachydacites. Zircon U–Pb ages show that the volcanics of the Hadataolegai Formation erupted between 230 Ma and 228 Ma during the Late Triassic, which agrees with recently obtained data. The volcanic rocks in this study have low Y (9.9–21.1 ppm) and Yb (0.78–2.02 ppm) contents, high Sr (444–954 ppm) contents, and slight Eu anomalies (δEu = 0.82 to 0.94), similar to ‘adakite‐like’ rocks. The dacites were formed by fractional crystallization of coeval andesitic magmas. The zircons within the andesite and trachyandesite yield higher positive εHf(t) values (+6.3 to +12.0) and model ages (TDM2) between 860 Ma and 453 Ma, which indicates that the magmas were generated by a newly accreted continental crustal source. Moreover, some of the volcanics are relatively high in MgO contents. These characteristics indicate that the volcanic magmas were derived from the partial melting of delaminated lower crust and mixing with mantle materials. Combining these data with previous studies, we suggest that the magmatism in the central GXR was governed by extension due to the closure of the PAO and the back‐arc extension associated with the southward subduction of the MOO plate (western GXR, near the Erguna Block).

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“…Previously, the majority of the plutonic rocks in the Erguna Block were separated into three phases (Paleoproterozoic, Neoproterozoic, and Carboniferous) by the BGMRHP (). However, new high‐precision U–Pb zircon ages show that these rocks were mostly emplaced in the late Permian–early Triassic and during the Late Triassic–Early Jurassic (Sun, Gou, et al, ; Tang et al, ; Tang et al, ; Wu et al, ).…”

Section: Geological Setting and Petrographymentioning

confidence: 99%

Geochronology, geochemistry, and zircon Hf isotopes of the late Permian–early Triassic Wuma intrusions in the Erguna Block, northeast China: Petrogenesis and implications for tectonic setting and crustal growth

et al. 2017

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The Wuma magmatic suite is a group of large granite plutons and small diorite stocks in the Erguna Block, northeast China. These intrusions were emplaced along the Mongol–Okhotsk Suture Zone during the late Permian–early Triassic (253–248 Ma). Significant chemical and isotopic diversity within the granites and diorites suggests variable formation conditions and the involvement of multiple magmatic sources. The granitic intrusions are dominantly characterized by moderate to large, uniform light rare earth element enrichments and variable heavy rare earth element depletions. Zircons from the Wuma granites have εHf(t) values of −6.0 to 0.5 and TDM2 ages of 1.6–1.2 Ga, suggesting that these granitic magmas were generated by partial melting of Mesoproterozoic continental crust. The diorites are compositionally similar to Andean plutonic rocks with moderate light rare earth element and heavy rare earth element fractionations and likely formed by partial melting of a sediment‐metasomatized mantle. The Wuma intrusions belong to the high‐K calc‐alkaline series and are characterized by a significant enrichment in large‐ion lithophile elements (e.g., Rb, Ba, K, and U) and depletion of high‐field strength elements (e.g., Nb, Ta, and Ti). These geochemical characteristics are typical of subduction‐related magmatism, which can be linked to the southward subduction of the Mongol–Okhotsk oceanic plate. Combined with data from published studies, our Hf isotopic analyses indicate 4 main periods of crustal growth beneath the Erguna Block: Mesoarchean (3.0–2.8 Ga), Neoarchean–Paleoproterozoic (2.6–1.8 Ga), Meso‐ to Neoproterozoic (1.6–0.7 Ga), and Phanerozoic (mainly Ordovician and Late Triassic–Early Cretaceous).

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Geochronological and geochemical constraints on the Erguna massif basement, NE China – subduction history of the Mongol–Okhotsk oceanic crust

Cited by 148 publications

References 29 publications

New Late Jurassic to Early Cretaceous Paleomagnetic Results From North China and Southern Mongolia and Their Implications for the Evolution of the Mongol‐Okhotsk Suture

New Late Jurassic to Early Cretaceous Paleomagnetic Results From North China and Southern Mongolia and Their Implications for the Evolution of the Mongol‐Okhotsk Suture

Geochronology, petrogenesis, and tectonic setting of Late Triassic volcanic rocks of the Hadataolegai Formation, central Great Xing'an Range, Northeast China

Geochronology, geochemistry, and zircon Hf isotopes of the late Permian–early Triassic Wuma intrusions in the Erguna Block, northeast China: Petrogenesis and implications for tectonic setting and crustal growth

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