Zircon U-Pb age, geochemistry and geological significance of Shunzuo granite in Wuzhishan area, Hainan Island
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摘要:
顺作花岗岩位于海南岛五指山地区白垩纪火山岩的东西两侧，LA-ICP-MS锆石U-Pb定年结果为254.4±2.4Ma，形成于晚二叠世。岩石学及地球化学特征显示，其属于亚碱性岩系列，SiO2含量为69.88%~74.51%，平均72.99%，属酸性岩类。具有明显的Ba、Ta-Nb、P、Ti负异常和较明显的Rb、K、Pb、Nd正异常。初始锶比值为0.70947~0.717388，低于大陆岩石平均锶初始比值（0.719），属中等锶花岗岩。εNd（t）为-9.25~-5.14，T2DM值为1444~1777Ma，其可能是板岩、千枚岩、斜长片麻岩、麻粒岩、斜长透辉石岩等岩石或更深部同类岩石受地壳增厚而发生的深熔作用及NW-SE向挤压应力共同作用的产物，为S型花岗岩。侵位方式是同碰撞构造环境下的强力侵位，最可能的是热气球膨胀式的底侵。属于壳源重熔型花岗岩，形成于同碰撞环境。
Abstract:Shunzuo granite is located in the Wuzhishan area of Hainan Island, on the east and west sides of the Cretaceous volcanic rocks. The LA-ICP-MS zircon U-Pb dating yielded an age of 254.4±2.4 Ma, suggesting Late Permian. Petrology and geochemistry show that it belongs to the sub-alkaline rock series, with SiO2 content 69.88%~74.51%, 72.99% on average, implying an acidic rock. It has obvious negative anomalies of Ba, Ta-Nb, P and Ti and obvious positive anomalies of Rb, K, Pb and Nd. The initial strontium ratio is 0.70947~0.717388, which is lower than the average ratio of strontium to continental rock (0.719), suggesting moderate strontium granite. εNd(t) is-9.25~-5.14, and T2DM is 1444~1777Ma. It might have resulted from the action of crust thickening in the deep melts and NW-SE trending extrusion on slate, phyllite, plagiogneiss, granulite, plagioclase diopside and other rocks or deeper similar rocks, being a product of stress synergy. It is S-type granite, and the emplacement is a strong emplacement type in the syn-collision structure environment. It is of the hot air balloon expansive type underplating. It belongs to the shell source remelting granite, which was formed in the syn-collision environment.
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Key words:
- zircon U-Pb age /
- Shunzuo granite /
- shell source remelting /
- S-type granite /
- Hainan
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表 1 顺作花岗岩锆石U-Th-Pb测年数据
Table 1. Zircon U-Th-Pb analyses of the Shunzuo granite
样品号 含量/10-6 Th/U 207Pb/235U 206Pb/238U
年龄/Ma207Pb/235U 206Pb/238U
年龄/Ma232Th 238U 测值 1σ 测值 1σ 测值 1σ 测值 1σ TD013-2-1 58.2 756 0.08 0.28388 0.00936 0.03936 0.00042 254 7 249 3 TD013-2-2 49.0 779 0.06 0.28305 0.01148 0.03966 0.00046 253 9 251 3 TD013-2-3 39.8 818 0.05 0.28035 0.01122 0.03992 0.00044 251 9 252 3 TD013-2-4 36.1 572 0.06 0.26347 0.01178 0.03995 0.00045 237 9 253 3 TD013-2-5 60.1 942 0.06 0.27743 0.00979 0.04012 0.00036 249 8 254 2 TD013-2-6 50.0 1160 0.04 0.28782 0.01068 0.04016 0.00038 257 8 254 2 TD013-2-7 66.9 1395 0.05 0.28235 0.00990 0.04043 0.00040 253 8 255 2 TD013-2-8 45.0 697 0.06 0.30763 0.01173 0.04063 0.00044 272 9 257 3 TD013-2-9 227 990 0.23 0.31555 0.01086 0.04096 0.00044 278 8 259 3 TD013-2-10 88.2 1855 0.05 0.2748 0.00785 0.04112 0.00039 247 6 260 2 
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表 2 顺作花岗岩主量、微量元素分析结果
Table 2. The major and trace elements analyses of the Shunzuo granite
样品号 D0329-5 D0628-1 D5181-1 D5202-2 TD002-1 D3136-1 平均值 SiO2 74.51 75.18 74.37 69.88 72.84 71.16 72.99 TIO2 0.10 0.10 0.07 0.21 0.31 0.32 0.19 Al2O3 13.56 13.79 14.81 15.37 14.06 15.53 14.52 Fe2O3 0.03 0.27 0.17 0.10 0.20 0 0.13 FeO 0.75 0.55 0.53 0.85 1.33 1.86 0.98 MnO 0.01 0.01 0.02 0.01 0.02 0.02 0.02 MgO 0.51 0.34 0.24 0.43 0.56 0.54 0.44 CaO 0.24 1.07 1.00 1.27 1.51 2.32 1.24 Na2O 1.93 1.91 3.07 2.73 2.62 3.06 2.55 K2O 7.18 5.81 4.79 8.41 5.08 4.09 5.89 P2O5 0.09 0.07 0.09 0.08 0.15 0.04 0.09 H2O 0.77 0.61 0.62 0.36 0.88 0.32 0.59 CO2 0.07 0.11 0.04 0.12 0.27 0.10 0.12 Rb 210 186 166 179 152 139 172 Ba 967 512 386 570 437 265 523 Sr 209 249 281 142 222 162 211 Th 9.24 1.63 6.14 49.90 32.10 22.00 20.17 U 1.63 0.87 2.03 5.61 9.36 1.61 3.52 Ta 0.36 0.41 0.51 0.88 1.52 1.19 0.81 Nb 2.07 3.97 3.45 8.90 12.60 14.70 7.62 Pb 51.30 48.20 42.30 53.11 43.70 18.21 42.80 Zr 192.00 75.72 55.91 46.10 186.00 160.00 119.29 Hf 6.29 2.27 1.88 1.65 5.76 4.96 3.80 Ga 12.72 13.60 15.30 15.63 19.12 24.10 16.75 Zn 17.50 21 13.61 36.30 43.22 123 42.44 Ni 4.28 3.14 1.72 2.51 2.19 37 8.47 V 16.10 12.21 3.56 11.80 13.62 155 35.38 Cr 9.82 17.10 16.21 9.48 7.65 91.00 25.21 Cs 3.61 2.92 3.86 5.14 4.69 4.58 4.13 Co 1.37 1.83 1.02 193. 2.56 15.7 4.07 Li 7.96 20.11 11.13 9.35 35.80 47.40 21.96 Cu 0.85 1.63 1.85 2.19 1.17 30.62 6.39 Mo 0.21 0.17 0.12 044 1.09 1.10 0.52 Ag 0.04 0.05 0.05 0.03 0.08 0.09 0.06 Au 0.70 0.20 0.30 0.40 0.38 3.40 0.90 Rb/Sr 1 0.75 0.59 1.26 0.68 0.86 0.86 注：主量元素含量单位为%，微量元素含量单位为10-6
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表 3 顺作花岗岩稀土元素、CIPW标准矿物含量及主要岩石化学参数分析结果
Table 3. Rare earth elements, CIPW standard mineral content and main rock chemistry parameters analytical results of the Shunzuo granite
样品号 D0329-5 D0628-1 D5181-1 D5202-2 ID002-1 D3136-1 平均值 La 19.80 15.21 1830 58.30 38.11 35.02 30.79 Ce 36.81 22.70 33.32 129.00 79.61 65.10 61.09 Pr 4.34 2.99 4.03 14.60 8.62 6.91 6.92 Nd 15.30 10.92 14.51 54.6 315 23.81 25.11 Sm 2.77 2.41 3.22 10.90 5.86 4.00 4.86 Eu 1.67 1.02 0.83 0.80 0.82 1.18 1.05 Gd 2.08 2.59 2.50 7.67 4.49 25 3.64 Tb 0.27 0.60 0.34 0.96 0.52 0.25 0.49 Dy 1.4 4.36 1.79 3.72 2.17 0.90 2.39 Ho 028 0.85 0.32 0.45 0.33 0.14 0.40 Er 0.79 2.20 0.86 0.94 101 0.27 101 Tm 0.17 0.31 0.16 0.13 0.12 0.02 0.15 Yb 0.92 1.63 0.94 0.70 0.72 0.24 0.86 Lu 014 0.23 0.15 0.10 0.10 0.03 0.13 Y 7.23 23.10 3.96 12.71 13.12 3.40 11.42 REE 71.43 67.99 81.23 282.87 173.95 14031 136.3 δEu 2.04 1.24 0.86 0.25 0.47 1.06 0.99 L/H 10.80 4.32 10.53 18.28 17.4 31.11 15.41 （La/Sm）n 4.61 4.07 3.67 3.45 2.50 5.60 3.98 （Gd/Yb）n 1.87 131 2.21 9.01 0.98 8.70 4.01 Ap 0.22 0.16 0.21 0.19 0.35 0.10 0.21 I1 0.19 019 0.13 0.40 0.59 0.61 0.35 Mt 0.04 0.39 0.25 0.15 0.29 0 019 Or 42.85 34.61 28.53 49.94 30.33 24.39 35.11 Ab 16.49 16.29 26.18 23.21 22.4 26.13 21.78 An 0.33 4.37 4.32 4.87 5.01 10.74 4.94 Qz 34.67 39.45 3591 18.61 34.69 31.24 32.43 C 2.52 2.79 3.03 0 2.46 2.19 2.17 Hy 2.50 1.50 1.36 217 3.23 4.30 2.51 A/CNK 1.1 1.21 1.23 0.97 112 1.14 1.14 DI 94.01 90.34 90.61 91.76 87.42 81.76 89.32 SI 4.90 3.83 2.73 3.43 5.72 5.65 438 σ 2.62 1.85 1.96 4.60 1.98 1.81 2.47 AR 4.88 3.16 2.98 5.05 2.96 2.34 3.56 全碱 9.11 7.72 7.86 1114 7.70 7.15 8.45 NKA 0.81 0.68 0.69 0.88 0.70 061 0.73 K2O/Na2O 3.72 3.04 1.56 3.08 1.94 1.34 245 FeO*/MgO 1.52 2.33 2.85 2.19 2.70 3.44 251 注：稀土元素含量单位为10-6
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表 4 顺作花岗岩Sr-Nd同位素组成
Table 4. Sr-Nd isotope composition of the Shunzuo granite
样品号 D0392-5 D5181-1 D3136-1 （87Rb/86Sr）m 2.9129 1.7106 1.213 （87Sr/86Sr）m 0.727913 0.715866 0.71578 （147Sm/144Nd）m 0.109437 0.134242 0.1046 （143Nd/144Nd）m 0.512019 0.512271 0.51219 t/Ma 254 254 254 （87Sr/86Sr）i 0.717388 0.709685 0.7114 εNd（t） -9.25 -5.14 -5.8 TDM 1653 1686 1342 T2DM 1777 1444 1 494 （143Nd/144Nd）i 0.511837 0.512048 0.512016
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① 宜昌地质矿产研究所、海南省地质调查院.1: 25万《乐东县、陵水县》幅区域地质调查报告.2004.
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