Provenance analysis of the Middle Jurassic Wanbao Formation on western edge of Longjiang Basin: Constraints from detrital Zircon ages and geochemistry characteristics
Zhang Yu-Jin, Zhang Chao, Wu Xin-Wei, Tan Hong-Yan, Ma Yong-Fei, Li Wei, Wang Yan
Shenyang Center of Geological Survey,China Geological Survey,Shenyang 110034,China
Abstract：Longjiang Basin is one of the newly established Meso-Cenozoic basins in the periphery area of the Songliao Basin. Analysis on clastic components of sandstones,heavy mineral combination,rock geochemistry and zircon U-Pb ages,and related comprehensive research of clastic rocks from the Middle Jurassic Wanbao Formation in Longjiang Basin,were carried out in this paper. The combination of sandstone clastic components and heavy minerals reflects that the mother rocks of the Wanbao Formation are mainly middle acid magmatic rocks and low grade metamorphic rocks,followed by a small number of medium basic magmatic rocks. Geochemical characteristics of sediment materials from the Wanbao Formation show that they are enriched in LREEs and depletion in HREEs,with a right-dipping signature. Meanwhile,they are enriched with(HFSE)Cs,Th,U,depletion of Nb,P,and Ti,which have similar geochemical characteristics of the Upper Crust. Detrital zircon shows four age peaks,the main peak is 167.5 Ma,the secondary peak ages are 236.4 Ma,309.1 Ma and 309.1 Ma,which reflect the multi-source characteristics of sediments in the Wanbao Formation. These sediments are mainly from the Middle Jurassic volcanic rocks,followed by products from the Late Devonian-Triassic magmatic activities. The comprehensive analysis shows that the sediments of the Wanbao Formation in the Longjiang basin have the characteristics of acid and neutral volcanic sources,most of which come from the upper crust. The primary rocks of the Wanbao Formation are formed in continental island arc environment under the background of active continental margin background. The Middle Jurassic of the Longjiang Basin may be affected by the dual effects of the subduction of the paleo-Pacific plate and the evolution of the Mongolian-Okhotsk suture zone.
Zhang Yu-Jin,Zhang Chao,Wu Xin-Wei et al. Provenance analysis of the Middle Jurassic Wanbao Formation on western edge of Longjiang Basin: Constraints from detrital Zircon ages and geochemistry characteristics[J]. JOPC, 2019, 21(3): 490-504.
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