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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