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Zircon U-Pb age, geochemistry and Sr-Nd-Hf isotopes of the Baolige granite complex in the Great Hingan Range, NE China
Zhu, XF; Chen, YJ; Wang, P; Wang, SX; Zhang, C; 32383160@qq.com
2018
发表期刊GEOLOGICAL JOURNAL
卷号53期号:4页码:1611-1634
摘要The Solonker zone is widely accepted as the suture between the North China Craton and the Siberia-Mongolia continental plate. The Baolige granite complex is located to the north side of the Solonker Suture and is mainly composed of monzogranite and granite. Zircon U-Pb ages, geochemistry, and Sr-Nd-Hf isotopic data of the Baolige granites were presented to constrain their petrogenesis and tectonic settings. Two monzogranite samples from Baolige yielded weighted mean zircon Pb-206/U-238 ages of 310.7 +/- 2.1Ma (mean square of weighted deviates (MSWD)=1.3) and 307.4 +/- 1.6Ma (MSWD=0.77), whereas the granite intruded into the monzogranite yielded an age of 296.2 +/- 2.0Ma (MSWD=1.2). Both the Baolige monzogranite and granite contain high contents of SiO2, K2O, and Al2O3, low contents of TiO2, MgO, and CaO, and are peraluminous high-K calc-alkaline. These rocks are characterized by enrichments of K, Rb, U, Pb, Th, and light rare earth elements and depletions of Nb, Ta, Ti, and heavy rare earth elements and contain slightly negative or no Eu anomalies, similar to typical arc-related granitoids. The Ti-in-zircon thermometry yielded 650-759 degrees C for the monzogranite and 645-796 degrees C for the granite. The monzogranite shows positive zircon epsilon(Hf)(t) values (4.7-13.2) and whole-rock epsilon(Nd)(t) values (3.6-5.2), with T-DM2(Hf) ages of 1,324-557Ma and T-DM2(Nd) ages of 1,015-821Ma, and I-Sr of 0.70363-0.70386. The granite shows epsilon(Hf)(t) values of 15.6-20.9 and epsilon(Nd)(t) values of 4.0-5.1, with T-DM2(Nd) ages of 957-832Ma, and I-Sr of 0.70364-0.70406. Geochemical evidence indicates that the Baolige granite complex is highly fractionated I-type and was likely formed by partial melting of the Neoproterozoic juvenile crust in a continental arc setting. We concluded that the Paleo-Asian Ocean may have undergone north-dipping subduction beneath the Siberia-Mongolia continental plate during the Late Carboniferous, and the subduction may have continued to the Early Permian (ca. 296Ma).
部门归属[Zhu, Xue-Feng; Chen, Yan-Jing; Wang, Pin; Zhang, Cheng] Peking Univ, Key Lab Orogen & Crust Evolut, Beijing, Peoples R China; [Wang, Pin] Chinese Acad Sci, South China Sea Inst Oceanol, CAS Key Lab Marginal Sea Geol, Guangzhou 510301, Guangdong, Peoples R China; [Wang, Shou-Xu] Shandong Gold Grp Co Ltd, Jinan, Shandong, Peoples R China
学科领域Geology
关键词[WOS]Baolige granite complex ; continental arc magmatism ; Great Hingan Range ; Paleo-Asian Ocean ; Solonker Suture ; Sr-Nd-Hf isotopes
资助项目MSG
文献类型期刊论文
条目标识符http://ir.scsio.ac.cn/handle/344004/17130
专题中科院边缘海地质重点实验室
通讯作者32383160@qq.com
推荐引用方式
GB/T 7714
Zhu, XF,Chen, YJ,Wang, P,et al. Zircon U-Pb age, geochemistry and Sr-Nd-Hf isotopes of the Baolige granite complex in the Great Hingan Range, NE China[J]. GEOLOGICAL JOURNAL,2018,53(4):1611-1634.
APA Zhu, XF,Chen, YJ,Wang, P,Wang, SX,Zhang, C,&32383160@qq.com.(2018).Zircon U-Pb age, geochemistry and Sr-Nd-Hf isotopes of the Baolige granite complex in the Great Hingan Range, NE China.GEOLOGICAL JOURNAL,53(4),1611-1634.
MLA Zhu, XF,et al."Zircon U-Pb age, geochemistry and Sr-Nd-Hf isotopes of the Baolige granite complex in the Great Hingan Range, NE China".GEOLOGICAL JOURNAL 53.4(2018):1611-1634.
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