a % 30% 20% 10% 0. 1 ~ 0. 5 mm ~ 0. 9 mm 0. 4 ~ 0. 6 mm 0. 1 ~ 0. 4 mm 2b U 35% -Pb 35% 15% 15% 0. 3 ~ 0. 9 mm

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1 GLOBAL GEOLOGY Vol. 34 No. 4 Dec U -Pb LA -ICP -MS U -Pb - Th /U ~ Ma 277 Ma Eu Rb K Nb Ta P Zr Ti P P597 A doi /j. issn Geological implications of Permian Fangshan granitic rocks in eastern Jiamusi Massif evidences from U -Pb chronology and geochemistry PU Jian-bin ZHANG Xing-zhou GUO Ye ZENG Zhen FU Qiu-lin ZHANG Hong-tao LIU Yang College of Earth Sciences Jilin University Changchun China Abstract Zircon LA -ICP -MS U -Pb dating results and the whole rock geochemistry of Fangshan granite in the eastern Jiamusi Massif are reported. The formation age and geodynamics setting of these granitic rocks are identified. Zircons from Fangshan granite rocks are euhedral-subhedral in shap and display distinctly oscillatory zoning structures. The values of Th /U are ~ indicating a typical magmatic origin. The dating results show that the granitic rocks formed in the Early Permian 278 Ma 277 Ma. The geochemical characteristics of Fangshan granite are weakly peraluminous and high in K calc alkaline series. These rocks are rich in LREE and large lithophile elements Rb and K and depleted in HREE and high field strength elements Nb Ta P Zr and Ti with Eu anomalies. The geochemical characteristics of the Fangshan granitic rocks are similar to the granitic rocks from the eastern Jiamusi Massif e. g. Meizuo Qingshan Chushan Chaihe Shichang and Jinshan representing a feature of volcanic arc granite VAG. Combining with the regional research data we deduce that the eastern margin of the Jiamusi Massif was active contenental margin during the Early Permian. Key words Jiamusi Massif Permain active contenental margin subduction granite xzzhang@ jlu. edu. cn

2 a % 30% 20% 10% 0. 1 ~ 0. 5 mm ~ 0. 9 mm 0. 4 ~ 0. 6 mm 0. 1 ~ 0. 4 mm 2b U 35% -Pb 35% 15% 15% 0. 3 ~ 0. 9 mm ~ 3 mm ~ 2 mm 0. 3 ~ 1. 0 mm U -Pb U -Pb ~ 500 Ma U -Pb LA - ICP -MS GeoLas ICPMS Agilent 7500a - 20 ~ 30 s 50s

3 4 U-Pb 905 F1. F2. F3. F4. F5.. Fig. 1 1 Geological sketch map of studied area

BCR -2 DataCal 91500 U - AGV -1 Pb 206 Pb / 238 U 5% 25 NIST 610 30 μm 26

4 a b Fig. 2 2 Photomicrographs of Fangshan granite X XRF U -Th -Pb ICPMS- BHVO -1 BCR -2 DataCal U - AGV -1 Pb 206 Pb / 238 U 5% 25 NIST μm U -Pb 2. 2 ICP -MS 3 10% 27 2 LA -ICP -MS U -Pb Th / U Fig. 3 3 CL CL images of representative zircons from Fangshan granite

5 4 U-Pb 907 Table 1 1 w Th w U w Th /U /10-6 / 10-6 Pb / 235 U ± 1σ LA -ICP -MS U -Pb Zircon LA -ICP -MS U -Pb dating results of Fangshan granite 206 Pb / 238 U ± 1σ /Ma 206 Pb / 238 U ± 1σ 207 Pb / 235 U ± 1σ A A A A A A A A A A A A A A A A A A A A A K K K K K K K K K K K K K K K K K K K K K K K K

6 Table 2 2 Analysis results of major trace and rare earth elements of Fangshan granite rocks 14H H H H H H13-6 SiO Al 2 O Fe 2 O FeO CaO MgO K 2 O Na 2 O TiO P 2 O MnO LOI TOTAL Ba Rb Sr Zr Nb Ni Co Zn Cr La Ce Pr Nd Sm Eu Gd Tb Dy Ho Er Tm Yb Lu Y Cs Ta Hf V U Th Sc

7 4 U-Pb ~ h h '55. 4 N '20. 0 E 46 2'55. 4 N '20. 0 E b Pb / 238 U a Pb / 238 U ~ Ma ± 3 Ma MSWD ~ Ma ± 3 Ma MSWD a 14h b 14h Fig. 4 4 U -Pb Zircon U -Pb concordia diagrams of Fangshan granite w SiO % ~ % w Na 2 O 3. 19% ~ 4. 03% w K 2 O 3. 33% ~ 4. 42% w K 2 O /w Na 2 O ~ A /CNK ~ w Al 2 O % ~ % A /CNK ~ A /NK ~ a SiO 2 - K 2 O 5b 278 Ma 277 Ma 1 4 LREE HREE U -Pb Eu 6a ~ La /Yb N ~ Eu δeu ~ b ± 4 Ma 267 Ma ± 2 Ma Rb K 260 ~ 278 Ma LILEs Nb Ta P Zr Ti HFSE LA - ICP -MS U -Pb - Th /U 254 ~ 284 Ma 254 ± 5 Ma 256 ± 5 Ma ~ 293 Ma

8 Fig. 5 5 A /CNK - A /NK SiO 2 - K 2 O A /CNK - A /NK diagram and SiO 2 - K 2 O diagram of Fangshan granite Fig. 6 6 Chondrite-normalized REE pattern and primitive mantle-normalized trace element spider diagram of Fangshan granite 6a 6b Rb K Th U 4. 2 Nb Ta P Ti Eu Sr Yb Y Sr Yb REE HREE 5

9 4 U-Pb 911 < 1. 0 GPa ~ 40 km 4. 3 I VAG LA -ICP -MS U -Pb 278Ma 277Ma Y + Nb -Rb J Fig. 7 Y + Nb -Rb discrimination diagram of tectonic environment for Fangshan granite and evolution of Xing'anling -Mongolian orogenic belt LI Shuang-lin OUYANG Zi-yuan. Tectonic framework XMOB and its adjacent region J. Marine Geology and Quaternary Geology J TANG Ke-dong WANG ying. Continental-margin structure of Northeast China and it's adjacent areas J. Acta Geology Ma J ZHANG Xing-zhou ZHOU Jian-bo CHI Xiao-guo et al. Late Paleozoic tectonic-sedimentation and petroleum 275 Ma resources in northeastern China J. Journal of Jilin

10 University Earth Science Edition ZHOU Jian-bo Wilde S A ZHANG Xing-zhou et al. The onset of Pacific margin accretion in NE China evidence from the Heilongjiang high-pressure metamorphic belt J. Tectonophysics ~ 500 Ma J ZHOU Jian-bo ZHANG Xing-zhou ZHENG Changqing. Confirming of the Heilongjiang ~ 500 Ma Pan -African Khondalite belt and its tectonic implications J. Acta Petrologica Sinica J SHRIMP U -Pb zircon evidence for igneous ages from the ern China J. Journal of Jilin University Earth Science Edition M CAO Xi DANG Zeng-xin ZHANG Xing-zhou et al. The composite Jiamusi terrane M. Changchun Jilin Science and Technology Press J LI Jin-yi. Some new ideas on tectonics of NE China and its neighboring areas J. Geological Review M. 10 Wilde S A Dorsett-Bain H L Lennon R G. Geological setting and controls on the development of graphite sillimanite and phosphate mineralization within the Jiamusi Massif an exotic fragment of Gondawana land located in North -Eastern China J. Gonwana Research Wilde S A ZHANG Xing-zhou WU Fu-yuan et al. Extension of a newly-identified 500 Ma metamorphic terrain in Northeast China further U -Pb SHRIMP dating of the Mashan complex Heilongjiang Province China J. Tectonophysics / WU Fu-yuan SUN De-you GE Wen-chun et al. Geochronology of the Phanerozoic granitoids in northeastern China J. Journal of Asian Earth Sciences ZHOU Jian-bo Wilde S A ZHAO Guo-chun et al. Pan -African metamorphic and magmatic rocks of the Khanka Massif NE China further evidence regarding their affinity J. Geological Magazine Wilde S A WU Fu-yuan ZHANG Xing-zhou. The Mashan complex SHRIMP U -Pb zircon evidence for a Late Pan-African metamorphic event in NE China and its implication for global continental reconstructions J. Geochemica Wilde S A WU Fu-yuan ZHANG Xing-zhou et al. Late Pan -African magmatism in Northeastern China Mashan Complex J. Precambrian Research ZHANG Xing-zhou QIAO De-wu CHI Xiao-guo et al. Late-Paleozoic tectonic evolution and oil-gas potentiality in Northeastern China J. Geological Bulletin of Chi- 16 Wilde S A. U -Pb J na / WU Fu-yuan Wilde S A SUN De-you. Zircon 7. SHRIMP U -Pb ages of gneissic granites in Jiamusi massif northeastern China J. Acta Petrologica Sinica J ZHANG Xing-zhou MA Yu-xia CHI Xiao-guo et al WU Fu-yuan SUN De-you LI Hui-min. A-type granites Discussion on Phanerozoic tectonic evolution in Northeast- in northeastern China age and geochemical constraints on their petrogenesis J. Chemical Geology / WU Fu-yuan YANG Jin-hui LO Ching-hua et al. The Heilongjiang Group a Jurassic accretionary complex in the Jiamusi Massif at the western Pacific margin of northeastern China J. Island Arc Heilongjiang Bureau of Geology and Mineral Resources. Regional geology of Heilongjiang Province M. Beijing Geological Publishing House U -Pb J MENG En XU Wen-liang YANG De-bin et al. Permian volcanisms in eastern and southeastern margins of the Jiamusi Massif Northeastern China zircon U -Pb chronology geochemistry and its tectonic implications J. Science Bulletin WANG Cheng-wen JIN Wei ZHANG Xing-zhou et al. New understanding of the Late Paleozoic tectonics in

11 4 U-Pb 913 Northeastern China and adjacent areas J. Journal of Stratigraphy ZHANG Xing-zhou GUO Ye ZHOU Jian-bo et al. Late Paleozoic -Early Mesozoic tectonic evolution in the east margin of the Jiamusi massif eastern northeastern China J. Russian Journal of Pacific Geology Kirillova G L. Late Mesozoic -Cenozoic sedimentary basins of active continental margin of Southeast Russia paleogeography tectonics and coal-oil-gas presence J. Marine and Petroleum Geology Kirillova G L. The late Mesozoic-Cenozoic sedimentary basins at the continental margin of southeastern Russia geodynamic evolution and coal and petroleum potential J. Geotectonics Wiedenbeck M Alle P Corfu F et al. Three natural zircon standards for U -Th -Pb Lu -Hf trace element U -Pb J HUANG Ying-cong REN Dong-hui ZHANG Xingzhou et al. Zircon U -Pb dating of Meizuo granite and geological significance in the Huanan uplift east Heilongjiang Province J. Journal of Jilin University Earth Science Edition LI Jin-Yi. Permian geodynamic setting of Northeast China and adjacent regions closure of the Paleo-Asian Ocean and subduction of the Paleo-Pacific Plate J. Journal of Asian Earth Science / and REE analyses J. Geostandards newsletter LIU Yong-sheng GAO Shan HU Zhao-chu et al. Continental and oceanic crust recycling-induced meltperidotite interactions in the Trans -North China Orogen U -Pb dating Hf isotopes and trace elements in zircons J YU Jie-jiang HOU Xue-gang GE Wen-chun et al. Magma mixing genesis of the Early Permian Liulian pluton from mantle xenoliths J. Journal of Petrology at the northeastern margin of the Jiamusi massif in / NE China evidences from petrography geochronology 27 Rudnick R L Gao S. Petrology and geochemistry of and geochemistry J. Acta Petrologica Sinica 2013 spinel peridotite xenoliths from Hannuoba and Qixia North China craton J. Lithos /2 /3 / Han B F Wang S G Jahn B M et al. Depleted-mantle source for the Ulungur River A-type granites from North Xinjiang China geochemistry and Nd -Sr isotopic evidence and implications for Phanerozoic crustal growth J. Chemical Geology Mcculloch M T Gamble J A. Geochemical and geodynamical constraints on subduction zone magmatism J U-Pb J YANG Hao ZHANG Yan-long CHEN Hui-jun et al. Zircon U-Pb ages of Khanka Lake granitic complex and its geological implication J. Global Geology SUN Ming-dao XU Yi-gang Wilde S A et al. The Permian Dongfanghong island-arc gabbro of the Wandashan orogen NE China implications for Paleo-Pacific Earth and Planetary Science Letters / subduction J. Tectonophysics Pearce J A Harris N B W Tindle A G. Trace element discrimination diagrams for the tectonic interpretation of granitic rocks J. Journal of Petrology J YU Jian GUO Wei WANG Shao-hua et al. Recon- 31. struction of depositional environment of Dalingqiao Formation in Raohe area and its geological J. significance BI Jun-hui GE Wen-chun ZHANG Yan-long et al. Petrogenesis of Permian Jinshan granitic complex in the eastern Jiamusi massif and its geological implications J. Journal of Earth Sciences and Environment J. Global Geology

NE NW NE NW 6 NE NW NE ~ 85 1 ~ 4 NW NE 702 NE NW 1 NE30 ~ 50 SE 50 ~ 60 1a I II I 73 m 3. 5 m g /t II 62 m 60 ~ 100

NE NW NE NW 6 NE NW NE ~ 85 1 ~ 4 NW NE 702 NE NW 1 NE30 ~ 50 SE 50 ~ 60 1a I II I 73 m 3. 5 m g /t II 62 m 60 ~ 100 34 2 2015 6 GLOBAL GEOLOGY Vol. 34 No. 2 Jun. 2015 1004 5589 2015 02 0385 11 1 1 2 2 1 1 1. 130061 2. 702 157021 σ < 3. 3 Rb Ba K Pb LILE Nb Ta P Ti HFSE LREE HREE Nb /Ta 14. 7 Zr /Hf 26. 23 ~ 38. 37 P618.