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Petrogenesis of granodiorites in Huoluotai Cu-Pb-Zn mining area: constrain from geochemistry and zircon U-Pb geochronology,northern Daxing'anling
SHANG Yi-guang1,2, SUN Feng-yue1, JIANG He-fang1, WANG Qi1, YIN Yue1, MENG Qing-peng1, ZHANG Zhi-ying1
1. College of Earth Sciences, Jilin University, Changchun 130061, China;
2. Heilongjiang Qiqihaer Mineral Exploration and Development Institute, Qiqihaer 161000, Heilongjiang, China
Abstract:

LA-ICP-MS U-Pb zircon geochronology of Huoluotai granodiorite of Daxing'anling area in Heillongjiang Province shows that Huoluotai granodiorite (145 Ma) results from magmatic intrusion of Early Cretaceous. The composition of elementary geochemistry indicates that it is a set of adakitic rocks characterized by high-K calc-alkaline series, with a high content of SiO2 (65.64%~66.00%) and K2O (3.67%~3.77%), low MgO (0.09%~1.21%), high content of Sr (814.00×10-6~893.00×10-6), low Yb (0.194×10-6 to 0.536×10-6) and Y (6.38×10-6 to 7.73×10-6), and obvious differentiation of light and heavy rare earth elements (10.1~14). The characteristics of La/Yb (92.54~245.88), Th/La (0.17~0.2), Th/U (4.01~4.84) and Mg# (26.70~29.22) show that the Huoluotai granodiorite was formed by partially melting of the thickened lower crust. Combined with regional tectonic evolution, it is concluded that the Huoluotai granodiorite originated from the transition process of crustal thickening compression to extension under the influence of Mongolia-Okhotsk tectonic system.

Keywords: Huoluotai of Daxinganling   granodiorite   zircon U-Pb chronology   geochemistry   tectonic environment  
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DOI: 10.3969/j.issn.1004-5589.2017.02.014
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