Citation: | CHE Yawen, LIU Jianfeng, ZHAO Shuo, GE Maohui, LYU Qianlu. Early early-Cretaceous post-collisional tectonic setting of the southern segment of the Great Xing'an Range: Evidence from the Lanjiayingzi gabbro-diorite in Linxi area[J]. Geological Bulletin of China, 2021, 40(1): 152-163. |
Based on the systematic petrology, zircon chronology and geochemistry analysis of the Lanjiayingzi gabiodiorite pluton in the north of Linxi County in southern Great Khingan Range, genesis of the pluton and the Early Cretaceous tectonic setting are discussed.Zircon U-Pb dating reveals that the pluton was formed in Early Cretaceous (145.6±0.6 Ma).Geochemistry of the pluton is characterized by 53.38%~54.45% of SiO2 contents, 1.34%~1.43% of K2O contents and 3.85%~4.05 % of Na2O contents, with 0.8~0.9 of A/CNK, which indicates that the pluton belongs to a calc-alkaline metaluminous magmatic rock.Its MgO and TFe2O3 contents vary from 5.44%~5.73% and 7.53%~8.33% respectively, with 36.96 to 38.24 of Mg# values.Combined with the girdle of plagioclase and the poikilitic texture of olivine in clinopyroxene, it is suggested that the pluton was the product of the fractional crystallization of mantle-derived primary magma.In addition, the pluton is relatively rich in LILEs such as Rb and Ba, and depletion in HFSEs such as Nb and Ta, with +5.4 to +9.0 of zircon εHf(t) values, which indicates that the pluton was derived from a depleted lithospheric mantle that experienced metasomatism from the subduction fluid.The Lanjiayingzi gabbrodiorite and coeval A-type granites in Linxi area constitute the bimodal magmatic assemblage, which suggests that they were formed in an extensional setting.Combined with regional geology, it is suggested that the formation of the Early Cretaceous magmatic rocks in southern Great Khingan Range has relation with the post-collision extensional setting resulting from closure of the Mongol-Okhotsk Ocean.
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Tectonic division of Central Asian Orogenic belt (a) and simplified regional geological map of Southern Great Khingan Range (b)
Geological map with the sampling location of the Linxi area
Textare, structure and mineral assembly of the gabbrodiorite pluton in the Lanjiayingzi area
Representative CL images (a) and U-Pb concordia diagram (b) of zircons from the Lanjiayingzi gabbrodiorite
TAS diagram of Early Cretaceous intrusive in Southern Great Khingan Range (a) and SiO2-K2O diagram of the Lanjiayingzi gabbrodiorite (b)
Chondrite-normalized REE patterns(a) and primitive mantle-normalized trace element patterns (b) of the Lanjiayingzi gabbrodiorite
Zircon Hf isotope data evolution diagrams of the Lanjiayingzi gabbrodiorite