The Early Late- Paleozoic Granitic Magmatism in the Zalantun Region, Northern Great Xing’an Range, NE China: Constraints on the Timing of Amalgamation of Erguna- Xing’an and Songnen Blocks
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Shenyang Geological Survey Center, China Geological Survey (CGS),College of Paleontology, ShenyangNormalUniversity, Shenyang,Shenyang Geological Survey Center, China Geological Survey (CGS),Shenyang Geological Survey Center, China Geological Survey (CGS),Shenyang Geological Survey Center, China Geological Survey (CGS),Shenyang Geological Survey Center, China Geological Survey (CGS),Shenyang Geological Survey Center, China Geological Survey (CGS),Shenyang Geological Survey Center, China Geological Survey (CGS),Shenyang Geological Survey Center, China Geological Survey (CGS),Shenyang Geological Survey Center, China Geological Survey (CGS),Shenyang Geological Survey Center, China Geological Survey (CGS),Shenyang Geological Survey Center, China Geological Survey (CGS)

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    Abstract:

    The Zalantun region, located in the middle part of the Erlian- Hegenshan- Heihe suture belt, contains well- developed early Late- Paleozoic granitoids superimposed by ductile deformation. Through field investigation and systematic analyses, such as microscopy, geochemistry and zircon U- Pb geochronology, we investigated rock- forming chronological sequence, petrogenesis and tectonic setting of the granitoids, redefined the time of their deformation, and then further revealed amalgamation between Erguna- Xing’an and Songnen blocks, providing new materials for understanding the regional tectonic evolution of the Xing’an- Mongolian Orogenic Belt. Geochronological study shows that the early Late- Paleozoic magmatism in the Zalantun region happened during 405~325 Ma, and can be sub- divided into three periods: Stage I at the Early- Middle Devonian (405~380 Ma), stage II at the Late Devonian- initial Early Carboniferous (365~350 Ma) and stage III at the late Early Carboniferous (335~325 Ma) respectively. TheⅠ stage and Ⅱ stage granitoids belong to metaluminous to weakly peraluminous granitoids of shoshonite series and high- K calc- alkaline series, and are likely the I- type and high fractionated I- type granites formed in island- arc magmatism of subduction environment. And the Ⅲ stage ones belong to metaluminous to weakly peraluminous granitoids of middle to high- K calc- alkaline series, and are likely high fractionated I- type and A- type granites formed in magmatism of post- collisional environment. The universal deformation of the granitoids, which was the product of lateral escape in a post- collisional environment, occurred in the end of Late Carboniferous to Early Permian (308~290 Ma). We conclude, therefore, that the occurrences of the early Late- Paleozoic granitic magmatism in the northern Great Xing’an Range was related to the collision and combination between Erguna- Xing’an and Songnen blocks, and the amalgamation at the Zalantun region might occur in the middle Early Carboniferous.

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QIAN Cheng, LU Lu, QIN Tao, LI Linchuan, CHEN Huijun, CUI Tianri, JIANG Bin, NA Fuchao, SUN Wei, WANG Yan, WU Xinwei, MA Yongfei.2018. The Early Late- Paleozoic Granitic Magmatism in the Zalantun Region, Northern Great Xing’an Range, NE China: Constraints on the Timing of Amalgamation of Erguna- Xing’an and Songnen Blocks[J]. Acta Geologica Sinica,92(11):2190-2214

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History
  • Received:March 20,2018
  • Revised:September 28,2018
  • Adopted:May 19,2018
  • Online: November 15,2018
  • Published: