Geochemical characteristics of gabbro from Binggounan Cu -Ni deposit in the north of eastern Kunlun metallogenic belt

35 3 2016 9 GLOBAL GEOLOGY Vol. 35 No. 3 Sept. 2016 1004 5589 2016 03 0729 09 1 1 1 1 1 1 2 1. 130061 2. 810008 SiO 2 49. 72% ~ 51. 58% δeu 1. 26 ~ 1. 54 Eu LILE Rb Ba K P La /Sm Th /La Nb /U P588. 124 P595 A doi 10. 3969 /j. issn. 1004-5589. 2016. 03. 013 Geochemical characteristics of gabbro from Binggounan Cu -Ni deposit in the north of eastern Kunlun metallogenic belt YAN Jia-ming 1 SUN Feng-yue 1 CHEN Guang-jun 1 QIAN Ye 1 LI Liang 1 WANG Chao 1 HE Shu-yue 2 1. College of Earth Sciences Jilin University Changchun 130061 China 2. The Third Institution of Qinghai Geological Mineral Prospecting Xining 810008 China Abstract In order to determine the petrogenesis and tectonic setting in the north of eastern Kunlun orogenic belt the authors analyze the whole rock geochemical characteristics of gabbro in the Binggounan copper-nickel deposit. The SiO 2 content of Binggounan gabbros is 49. 72% to 51. 58% and rock series are of calcium alkali. Chondrte-normalized REE patterns are LREE-slight rich δeu are 1. 26 ~ 1. 54 with slight Eu positive anomaly. The gabbros are enriched in large ion lithophile elements LILE Rb Ba K and relatively depleted in P. The La / Sm Th /La and Nb /U values suggest that rock masses have experienced some crustal contamination in the process of emplacement. Studies suggest that the primary magma deprived from a depleted mantle. Combining with regional tectonic evolution the authors conclude that the gabbro formed in the post-collisional extension setting. Key words Binggounan copper and nickel deposit gabbro whole rock geochemical characteristics magma source tectonic setting north of eastern Kunlun orogenic belt 1-4 0-5 2016-04-13 2016-06-03 201411025. 1963-. E-mail sfy@ jlu. edu. cn

730 35-6-9 1-10 11 12 13 15 3 16 2 3 14-1 1a 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12.. Fig. 1 1 1 Regional geographic map of Binggounan in north of eastern Kunlun orogenic belt 1. R. 2014. 2. S. 2003.

3 731-0. 35 km 2 1b 2 1. 5 ~ 5 km 30 ~ 60 m 2 60% ~ 65% 20% ~ 25% 5% - - ~ 10% 3% 2 ~ 4 mm - 1. 5 mm ± 1 mm ± 0. 5 km 2 0. 4 km 2 a b. Opx. Pl. Fig. 2 2 Microphoto graphs of Binggounan gabbro CaO K 3 2 O MnO P 2 O 5 Fe 2 O T 3 0. 01% 0. 005% FeO X - 0. 1% Fining MAT MgO -ICP -MS Element Ⅰ Na 2 O SiO 2 Al 2 O 3 0. 015% TiO 2 17

732 35 4 4. 1 4. 1. 1 - Zr / TiO 2 3 5 AFM 4 1 Al 2 O 3 MgO 1. 83% ~ 2. 16% SiO 2 49. 72% ~ 51. 58% Al 2 O 3 15. 7% ~ 16. 18% CaO 6. 45% ~ 8. 37% TiO 2 1. 9% ~ 2. 18% MgO MgO = 4. 06% ~ 4. 79% Mg # = 41 ~ 45 Nb /Y 18 1 3 Nb /Y - Zr / TiO 2 0. 0001 Fig. 3 Nb /Y - Zr / TiO 2 0. 0001 diagram of Binggounan gabbro Fig. 4 4 AFM AFM diagram of Binggounan gabbro 4. 1. 2 76. 46 10-6 ~ 90. 56 10-6 4 LREE /HREE 2. 60 ~ 2. 89 La /Yb N 1. 65 ~ 1. 95 La /Sm N 1. 64 ~ 2. 03 5 δeu 1. 26 ~ 1. 54 Eu 6 Rb Ba K P P 19 20 5 5. 1 SiO 2 49. 72% ~51. 58% 5 Fig. 5 21 Chondrte-normalized REE patterns of Binggounan gabbro

3 733 Table 1 1 wt% 10-6 Major elements wt% and trace elements 10-6 of Binggounan gabbro BGS -12 BGS -13 BGS -14 BGS -15 BGS -16 SiO 2 51. 25 50. 89 51. 20 51. 58 49. 72 TiO 2 2. 06 2. 01 2. 06 1. 90 2. 18 Al 2 O 3 15. 96 16. 12 15. 92 16. 18 15. 70 Fe 2 O 3 3. 19 2. 95 2. 81 2. 67 3. 05 FeO 7. 75 7. 83 7. 79 7. 71 7. 65 TFe 2 O 3 11. 79 11. 64 11. 46 11. 23 11. 54 MnO 0. 22 0. 22 0. 22 0. 21 0. 23 MgO 4. 16 4. 06 4. 40 4. 25 4. 79 CaO 6. 50 7. 48 6. 77 6. 45 8. 37 Na 2 O 4. 51 4. 32 4. 23 4. 34 3. 62 K 2 O 1. 18 1. 13 1. 52 1. 50 1. 51 P 2 O 5 0. 04 0. 11 0. 04 0. 03 0. 05 LOI 2. 15 1. 83 2. 01 2. 16 2. 11 Total 98. 96 98. 95 98. 97 98. 98 98. 97 Cr 62. 60 60. 80 66. 20 74. 90 93. 40 V 200. 00 174. 00 175. 00 183. 00 241. 00 Ga 17. 40 16. 00 14. 90 16. 90 16. 90 Rb 43. 20 35. 40 54. 30 60. 30 58. 40 Sr 325. 00 300. 00 323. 00 364. 00 337. 00 Y 34. 10 32. 20 28. 90 32. 61 32. 42 Nb 13. 01 11. 12 10. 81 12. 21 11. 62 Sb 3. 14 2. 56 2. 24 2. 86 2. 97 Cs 1. 91 2. 09 2. 46 2. 89 2. 33 Ba 199. 01 188. 03 238. 05 272. 12 253. 13 La 13. 31 12. 72 10. 23 12. 08 11. 52 Ce 27. 32 27. 12 22. 42 24. 93 24. 64 Pr 3. 63 3. 64 3. 11 3. 18 3. 27 Nd 15. 91 16. 41 13. 91 14. 80 14. 93 P 179. 01 497. 75 179. 01 113. 52 200. 85 Sm 4. 12 4. 54 3. 91 3. 98 4. 11 Ti 12 346. 59 12 046. 91 12 346. 59 11 387. 63 13 065. 81 Eu 2. 17 1. 91 1. 77 2. 06 1. 94 Gd 4. 79 4. 63 4. 23 4. 11 4. 58 Tb 1. 01 1. 01 0. 93 0. 92 0. 94 Dy 6. 38 6. 27 5. 58 5. 86 6. 22 Ho 1. 43 1. 27 1. 22 1. 29 1. 29 Er 4. 17 4. 07 3. 89 3. 93 4. 16 Tm 0. 73 0. 67 0. 65 0. 66 0. 65 Yb 4. 94 4. 40 4. 17 4. 49 4. 52 Lu 0. 75 0. 61 0. 62 0. 65 0. 66 Hf 5. 21 4. 37 4. 32 4. 75 5. 12 Ta 0. 82 0. 67 0. 71 0. 74 0. 69 Tl 0. 94 0. 74 1. 13 1. 25 1. 22 Th 2. 32 1. 98 1. 78 2. 01 1. 91 U 0. 60 0. 50 0. 46 0. 55 0. 50 K 9795. 76 9380. 68 12618. 26 12452. 23 12535. 24 Zr 195. 03 165. 11 168. 15 185. 07 197. 04 ΣREE 90. 56 89. 12 76. 45 82. 83 83. 33 δeu 1. 48 1. 26 1. 32 1. 54 1. 36 LREE 66. 39 66. 19 55. 18 60. 92 60. 32 HREE 24. 17 22. 93 21. 27 21. 91 23. 01 LREE /HREE 2. 74 2. 88 2. 59 2. 77 2. 62 Nb /Ta 15. 91 16. 49 15. 21 16. 59 16. 69 Sm /Nd 0. 25 0. 27 0. 28 0. 26 0. 27 Rb /Sr 0. 13 0. 11 0. 16 0. 16 0. 17 10-2 10-6.

734 35 MgO 4. 16% ~ 4. 79% Mg # 41 ~ 45 Cr Ni Co 60. 8 10-6 ~ 93. 4 10-6 19. 9 10-6 ~ 30. 7 10-6 20. 0 10-6 ~ 32. 0 10-6 LILE 427. 5 ± 7. 1 Ma 27 6 La /Sm 4. 5 23 La /Sm 2. 6 ~ 3. 2 Th /La 0. 17 0. 125 0. 204 24 Nb /U 34 Nb /U 9 ~ 12 23 Nb /U 21. 5 ~ 23. 1 OIB K /Ti 0. 70 23 K /Ti 0. 78 ~ 1. 1 0. 94 OIB 9 28 5. 2 Th Nb Zr Th Nb Zr Th Nb Zr 29 Th /Nb > 0. 11 Nb /Zr > 0. 04 Nb /Zr < 0. 04 Nb /Zr = 0. 04 29 Th /Nb > 0. 11 Nb /Zr > 0. 04 30 Zr - Zr /Y WPB Zr Y 22 6 Fig. 6 Primitive mantle-normalized trace element spider diagram of Binggounan gabbro 7 Zr - TiO 2 31 8 30 Zr - Zr /Y 29 OIB HFSE LREE /HFSE 27 IAB Fitton 25 La /Nb < 1. 5 OIB La /Nb < 1. 5 1 ~ 1. 1 Leat 26 La /Ta < 22 La / 32 Ta > ~ 30 La /Ta < 22 14 ~ 19 OIB

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