Tectonic attribute of Heilongjiang metamorphic rocks in the northern part of Hegang area, NE China: constrains from geochemistry, zircon U-Pb dating and Hf isotopic composition

被引：0
|
作者：
Li L. [1 ]
Sun J. [1 ]
Guo W. [2 ]
Han J. [1 ]
机构：
[1] School of Earth Sciences, Jilin University, Changchun, 130061, Jilin
[2] Geological Institute of North China Geological Exploration Bureau of Tianjin, Tianjin
来源：
Sun, Jinggui (sunjinggui@jlu.edu.cn) | 1600年 / Science Press卷 / 40期
关键词：
Formation environment; Geochemistry; Heilongjiang metamorphic rocks; Hf isotopic composition; Tectonic setting; Zircon U-Pb dating;
D O I：
10.16539/j.ddgzyckx.2016.05.010
中图分类号：
学科分类号：
摘要：
The Heilongjiang metamorphic rocks located in the northern part of the Hegang area, NE China, consist of epidote-chlorite-albite schist, epidote-glaucophane schist (the lower group), and two-mica schist, garnet-muscovite-albite schist, calcite-muscovite-albite schist, garnet-muscovite-quartz schist (the upper group), etc. Detailed research on geochemistry, zircon U-Pb dating and Hf isotopic composition showed that the protoliths of the lower group are alkali basalt derived from mantle (SiO2=47.44%-48.38%), and island arc calc alkali basalt (SiO2=46.84%-49.22%). The lower group contains three groups of zircon U-Pb age (526±44 Ma, n=3; 249±11 Ma, n=6; 207±4 Ma, n=8), whereas the protolith of the upper group is alternative continent-marine facies clastic rock (SiO2=66.70%-93.00%), and contains four groups of detrital zircon U-Pb age (484±13 Ma, n=3; 429±24 Ma, n=3; 277±4 Ma, n=11; 262±3 Ma, n=6). Combined with zircon internal texture, Hf isotopic composition and regional tectonic evolution features, we suggest that the volcanic eruption and sedimentation occurred at 277±4 Ma, and collision orogeny was during 262 Ma to 249 Ma. Tectonic exhumation occurred at 207±4 Ma. The research is significant to identify the nature and tectonic affinity of Heilongjiang metamorphic rocks. © 2016, Science Press. All right reserved.
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页码：1014 / 1030
页数：16
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