Geochronology, geochemistry, and Hf isotopic compositions of early Permian syenogranite and diabase from the northern Great Xing’an Range, northeastern China: petrogenesis and tectonic implications

Abstract

Geodynamic evolution in the Late Paleozoic is significant for understanding the final amalgamation of the Central Asian Orogenic Belt (CAOB). No consensus has yet been reached regarding the late Paleozoic geodynamic evolution of the northern Great Xing’an Range (GXR) in Northeast China, the eastern CAOB. Furthermore, late Palaeozoic syenogranite–diabase dyke association is present in the Xiaokele area in northern GXR. It provides an important opportunity to understand the nature of magmatism and the geodynamic evolution during this period. This paper presents new zircon U–Pb ages, zircon Hf isotopic compositions, and geochemical data of whole-rocks for Xiaokele syenogranite and diabase. Zircon U–Pb dating suggests that the Xiaokele syenogranite (292.5 ± 0.9 Ma) and diabase (298.3 ± 1.5 Ma) were emplaced during the Early Permian. The Xiaokele syenogranites have high SiO2 contents, low MgO contents, and enriched zircon εHf(t) values, suggesting that their primary magma was generated by the partial melting of the juvenile crustal material. The Xiaokele diabases have low SiO2 contents, high MgO contents, are enriched in large-ion lithophile elements (LILEs), depleted in high-field-strength elements (HFSEs), and exhibit enriched zircon εHf(t) values. They derived from a lithospheric mantle source that had previously been metasomatized by slab-derived fluids. Combined with previous research results, we believe that the continent–continent collision between the Xing’an and Songliao blocks occurred during the late Early Carboniferous–early Late Carboniferous (330–310 Ma), and the two blocks were transformed into a post-collisional extensional setting during the latest Carboniferous–Early Permian.

Subduction‐related mafic to felsic magmatism in the Xiangpishan concentric calc‐alkaline complex, Northeast Tibetan Plateau

“…They are enriched in LILEs (Rb, Th, U, K, La) and depleted in HFSEs (Ba, Nb, Sr, P, Ti), suggestive of crust‐derived granites (Hildreth & Moorbath, 1988). According to previous studies, the ratio of some trace elements like Nb/Ta and Zr/Hf varies little during magmatic evolution, so they are usually applied for discriminating magmatic sources (e.g., Sun, Li, et al, 2020). All studied granodiorites possess relatively low Nb/Ta (7.48–12.41) and Zr/Hf (26.85–34.95), which are consistent or close to the average crustal compositions (Nb/Ta = 11.4, Zr/Hf = 33) (Taylor & McLennan, 1985).…”

Zircon U-Pb Dating of the Irizar Granite in the Central Victoria Land, Antarctica: Insights into the Tectonic Evolution along the Ross Orogen

“…Such a transition in magmatic composition and the different deformation features should be associated with the geodynamic change, from pre-to syn-collisional compression to post-collisional extension. Besides, granitoid-mafic dike associations are common in extensional tectonic regimes linked to post-collisional events [80][81][82][83][84]. The emplacement of the Irizar granite in the Central Victoria Land is accompanied by coeval and genetically related Vegetation lamprophyre dikes with alkaline affinity [11] (Figure 2).…”

Fluid Inclusions and C–H–O–S–Pb Isotopes of the Huoluotai Porphyry Cu (Mo) Deposit in the Northern Great Xing’an Range, NE China: Implications for Ore Genesis

“…The main faults in the Erguna Block are NE-striking Erguna and Derbugan River faults (Figure 1C; [16]). The basement of the Erguna Block mainly contains Neoproterozoic granitoids and metamorphic supracrustal rocks [16][17][18][19]. The exposed strata in the Erguna Block mainly consist of Paleozoic marine sediments [20], widely distributed Mesozoic terrigenous clastic rocks, and volcanic rocks [21].…”