Geochronology, Geochemistry and Hf Isotopic Composition of Amphibolite from Zhalantun Region in Northern Great Xing'an Range and Its Tectonic Significance

被引：0
|
作者：
Qian C. [1 ]
Wang Y. [1 ]
Lu L. [2 ,3 ]
Qin T. [1 ]
Li L. [1 ]
Cui T. [1 ]
Chen H. [1 ]
Yang L. [1 ]
机构：
[1] Shenyang Center of Geological Survey, China Geological Survey, Shenyang
[2] College of Paleontology, Shenyang Normal University, Shenyang
[3] Key Laboratory of Evolution of Past Life in Northeast Asia, Ministry of Natural Resources, Shenyang
来源：
Diqiu Kexue - Zhongguo Dizhi Daxue Xuebao/Earth Science - Journal of China University of Geosciences | 2019年 / 44卷 / 10期
关键词：
Amphibolite; Hegenshan-Heihe suture belt; Hf isotopic composition; Petrology; Zircon U-Pb geochronology;
D O I：
10.3799/dqkx.2019.027
中图分类号：
学科分类号：
摘要：
The Late Paleozoic magmatic rocks with ductile deformation occurred in the Zhalantun region located in the middle of the Hegenshan-Heihe tectonic belt,which well record the tectonic evolution history of the Late Paleozoic, but the research degree is low. Through the field investigation, the geochronology and geochemistry of amphibolite lenticles from granitic mylonite in the Toudaogou, southern Zhalantun, are systematically studied, and the petrogenesis and tectonic setting of the amphibolite are discussed. It is found that the protolith of amphibolite is basaltic andesite, yielding an average zircon U-Pb age of 373.0±2.6 Ma which is equivalent to the volcanic rocks of Daminshan Group. The rocks belong to sodium series, which are enriched in light rare earth elements, large ion lithophile elements, but are depleted in high field strength elements. The zircon εHf(t) values of the amphibolite range from +5.39 to +10.06, similar to the features of the Xing'an island arc, suggesting that the protolith of amphibolite may be derived from the melting of a juvenile lower crust originating from depleted mantle which were modified by fluids stemmed from altered ocean crust, and supposedly formed in an fore arc basin above the subduction zone. In the Late Devonian, back-arc basin, inter-arc basin and fore-arc basin ocurred in the southeast region of Erguan-Xing'an block. The amphibolite and its surrounding granitic mylonite experienced multistage metamorphic deformation. The amphibolite yielded a metamorphic age of about 241.5±9.6 Ma, which may be related to the extension of the late evolution of the Tianshan-Xingmeng orogenic belt. © 2019, Editorial Department of Earth Science. All right reserved.
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页码：3193 / 3208
页数：15
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共 52 条
  • [31] Su Y.Z., Some Problems of Paleozoic Biostratigraphy in Northeastern China, Jilin Geolgy, 15, 3-4, pp. 66-69, (1996)
  • [32] Sun D.Y., Wu F.Y., Li H.M., Et al., The Age of Post-Orogenic A-Type Granite in the Northwest of Xiaoxing'an Mountains and Its Relationship with the Eastward Extension of the Soren-Heganshan-Zhalaite Collision Zone, Chinese Science Bulletin, 45, 20, pp. 2217-2222, (2000)
  • [33] Sun F.T., Liu C., Qiu D.M., Et al., Petrogenesis and Geodynamic Significance of Intermediate-Basic Intrusive Rocks in Xiaokuile River, Eastern Slope of the Great Xing'an Range: Evidences of Zircon U-Pb Geochronology, Elements and Hf Isotope Geochemistry, Journal of Jilin University(Earth Science Edition), 48, 1, pp. 145-164, (2018)
  • [34] Sun S.S., McDonough W.F., Chemical and Isotopic Systematics of Oceanic Basalts: Implications for Mantle Composition and Processes, Geological Society, London, Special Publications, 42, 1, pp. 313-345, (1989)
  • [35] Tang K.D., On Tectonic Development of the Fold Belts in the North Margin of Sino-Korean Platform, Geoscience, 3, 2, pp. 195-204, (1989)
  • [36] Wang Y.L., Zhang C.J., Xiu S.Z., Th/Hf-Ta/Hf Identification of Tectonic Setting of Basalts, Acta Petrologica Sinca, 17, 3, pp. 413-421, (2001)
  • [37] Wang Z.Y., Zheng C.Q., Xiu J.L., Et al., Geochemistry and Its Tectonic Implictions of Metamorphic Rocks of Jiageda Formation in Moerdaoga Area, Inner Mongolia, Earth Science, 43, 1, pp. 176-198, (2018)
  • [38] Windley B.F., Alexeiev D., Xiao W.J., Et al., Tectonic Models for Accretion of the Central Asian Orogenic Belt, Journal of the Geological Society, 164, 1, pp. 31-47, (2007)
  • [39] Wu F.Y., Sun D.Y., Li H.M., Et al., A-Type Granites in Northeastern China: Age and Geochemical Constraints on Their Petrogenesis, Chemical Geology, 187, 1-2, pp. 143-173, (2002)
  • [40] Wu G., Chen Y.C., Sun F.Y., Et al., Geochronology, Geochemistry, and Sr-Nd-Hf Isotopes of the Early Paleozoic Igneous Rocks in the Duobaoshan Area, NE China, and Their Geological Significance, Journal of Asian Earth Sciences, 97, pp. 229-250, (2015)
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