Petrogenesis of the Shuicaoba monzonitic granite porphyry in Ninglang, Yunnan: constraints from zircon U-Pb geochronology and geochemistry
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摘要:
云南水草坝岩体位于祥云-宁蒗铜金成矿带北段，是金沙江-红河新生代富碱斑岩成矿带的重要组成部分。对水草坝二长斑岩进行了岩相学、锆石U-Pb年龄和岩石地球化学研究，为该区新生代构造岩浆演化提供新的约束。LA-ICP-MS锆石U-Pb分析结果表明，水草坝二长花岗斑岩形成于古近纪渐新世早期(33.1±0.3 Ma)。岩石地球化学特征显示，岩体具有高硅、富碱的特征，且A/CNK大于1，属于过铝质富碱二长花岗斑岩。岩石稀土元素总量较高(ΣREE = 114.68×10-6~384.79×10-6)，稀土元素配分模式呈右倾型，轻、重稀土分馏明显((La/Yb)N = 440.37~114.09)，Eu无明显异常(0.84~1.14)，具有富集轻稀土元素和大离子亲石元素(Rb、Sr、K等)、亏损重稀土元素和高场强元素(Nb、Ta、Ti等)，以及高Sr低Y、Yb的特征，属于典型的C型埃达克岩。综合分析认为，水草坝二长花岗斑岩岩浆源区主要为加厚下地壳的部分熔融，可能有少量幔源组分的参与。结合区域构造演化，认为水草坝二长花岗斑岩形成于印度-欧亚板块晚碰撞走滑期构造应力由挤压向伸展转换的动力学背景。
Abstract:The Shuicaoba monzonitic granite porphyry is located north segment of the Xiangyun-ninglang Cu-Au metallogenic belt, and it is also an important part of the Jinshajiang-Red River enozoic alkali-rich porphyry belt.Based on petrography, zircon U-Pb geochronology and petrogeochemical analysis of the Shuicaoba Monzogranite porphyry, new constraints have be provided for the Cenozoic tectonic magmatic evolution in this area.LA-ICP-MS zircon U-Pb dating indicates that Shuicaoba monzonitic granite porphyry is of Early Oligocene (33.1±0.3 Ma).The pluton is rich in SiO2 and alkali, with the ratio of A/CNK > 1, belonging to the peraluminaceous alkali rich monzonite porphyry.The rock has a total high amount of REE elements(ΣREE=114.68×10-6~384.79×10-6), right-leaning REE distribution pattern, and obvious fractionation of LREE((La/Yb)N = 440.37~114.09), showing no significant Eu anomaly(0.84~1.14).The adakite is enriching in LILE(such as Rb, Sr and Ba) and HFSE (such as Th, U, K and La), depleting in HREE, high field strength elements (Nb, Ta, Ti, etc.), with a high amount of Sr and low amount of Y and Yb, which is typical C-type Adakite.Comprehensive analysis shows that the magmatic source area of the Shuicaoba monzogranite porphyry is mainly partial melting of the thickened lower crust, and a small amount of mantle-derived components may be involved.Combined with the regional tectonic evolution, it is considered that the Shuicaoba monzogranite porphyry was formed under the dynamic background of the tectonic stress transition from compression to extension during the late Indian-Eurasian plate collision strike slip period.
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表 1 水草坝二长花岗斑岩LA-ICP-MS锆石U-Th-Pb分析结果
Table 1. LA-ICP-MS zircon U-Th-Pb results of the Shuicaoba monzonitic granite porphyry
测点 Pb/
10-6232Th/
10-6238U/
10-6Th/U 同位素比值 年龄/Ma 207Pb/
206Pb1σ 207Pb/
235U1σ 206Pb/
238U1σ 207Pb/
206Pb1σ 207Pb/
235U1σ 206Pb/
238U1σ SCB1-4-01 2.51 480 341 1.41 0.0477 0.0046 0.0324 0.0027 0.0051 0.0001 87.1 215 32.4 2.7 33.1 0.7 SCB1-4-02 1.33 215 200 1.08 0.0578 0.0097 0.0331 0.0042 0.0051 0.0002 524 374 33.1 4.2 32.8 1.0 SCB1-4-03 2.69 532 368 1.45 0.0499 0.0054 0.0333 0.0029 0.0051 0.0001 187 246 33.3 2.8 32.9 0.6 SCB1-4-05 2.70 462 388 1.19 0.0466 0.0041 0.0315 0.0026 0.0050 0.0001 27.9 206 31.5 2.6 32.2 0.5 SCB1-4-06 2.65 494 368 1.34 0.0473 0.0050 0.0320 0.0032 0.0050 0.0001 61.2 237 32.0 3.1 32.3 0.7 SCB1-4-08 2.75 540 386 1.40 0.0491 0.0045 0.0329 0.0027 0.0051 0.0001 150 200 32.9 2.6 32.7 0.6 SCB1-4-09 2.11 357 308 1.16 0.0469 0.0043 0.0326 0.0026 0.0051 0.0001 55.7 194 32.6 2.6 32.9 0.6 SCB1-4-10 2.21 424 302 1.40 0.0474 0.0047 0.0340 0.0032 0.0052 0.0001 77.9 209 33.9 3.1 33.7 0.7 SCB1-4-12 1.84 318 264 1.20 0.0492 0.0054 0.0339 0.0034 0.0053 0.0001 167 231 33.8 3.3 33.8 0.8 SCB1-4-14 1.28 221 188 1.17 0.0519 0.0072 0.0326 0.0035 0.0050 0.0002 283 289 32.6 3.4 32.3 1.0 SCB1-4-15 2.02 296 298 0.99 0.0500 0.0043 0.0336 0.0023 0.0052 0.0001 198 185 33.5 2.3 33.3 0.8 SCB1-4-16 1.77 310 254 1.22 0.0491 0.0051 0.0331 0.0027 0.0053 0.0001 150 239 33.0 2.6 33.8 0.8 SCB1-4-17 2.50 396 369 1.07 0.0481 0.0042 0.0336 0.0026 0.0052 0.0001 102 193 33.6 2.6 33.3 0.5 SCB1-4-18 3.28 666 427 1.56 0.0494 0.0055 0.0344 0.0034 0.0053 0.0001 169 237 34.3 3.3 34.0 0.7 SCB1-4-19 2.94 559 407 1.37 0.0473 0.0035 0.0330 0.0023 0.0051 0.0001 64.9 167 33.0 2.3 33.0 0.7 SCB1-4-20 2.89 541 393 1.38 0.0467 0.0039 0.0340 0.0025 0.0054 0.0001 35.3 185 34.0 2.4 34.4 0.7 SCB1-4-21 3.02 703 399 1.76 0.0499 0.0053 0.0326 0.0025 0.0051 0.0001 187 230 32.6 2.4 32.5 0.6 SCB1-4-22 4.66 907 653 1.39 0.0476 0.0031 0.0335 0.0021 0.0051 0.0001 79.7 148 33.5 2.1 32.9 0.4 SCB1-4-23 2.23 256 369 0.69 0.0480 0.0044 0.0328 0.0026 0.0050 0.0001 98.2 204 32.7 2.5 32.2 0.7 SCB1-4-24 3.06 697 406 1.72 0.0481 0.0041 0.0335 0.0025 0.0052 0.0001 102 198 33.5 2.5 33.6 0.7 SCB1-4-26 2.44 427 350 1.22 0.0486 0.0046 0.0342 0.0030 0.0053 0.0001 132 207 34.1 3.0 34.0 0.7 SCB1-4-27 2.00 353 300 1.18 0.0484 0.0047 0.0336 0.0027 0.0051 0.0001 117 215 33.5 2.6 33.0 0.7 SCB1-4-28 2.63 529 385 1.37 0.0497 0.0040 0.0330 0.0023 0.0050 0.0001 189 172 33.0 2.3 32.3 0.6 SCB1-4-29 2.83 520 425 1.22 0.0476 0.0044 0.0326 0.0026 0.0052 0.0001 79.7 204 32.6 2.6 33.3 0.6 
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表 2 水草坝二长花岗斑岩主量、微量和稀土元素分析结果
Table 2. Major, trace and rare earth elements analyses of the Shuicaoba monzonitic granite porphyry
样品号 SCB-1 SCB-2 SCB-3 SCB-4 SCB-5 SCB-6 SCB-7 SCB-8 SCB-9 SCB-10 D0073-1 D0073-2 D0073-3 D0073-4 D0073-5 SiO2 68.13 66.44 69.16 68.44 68.37 68.29 68.10 68.69 68.47 68.43 69.99 68.30 70.88 69.31 69.20 TiO2 0.31 0.33 0.35 0.35 0.36 0.33 0.32 0.31 0.30 0.33 0.24 0.28 0.35 0.25 0.26 Al2O3 16.52 15.55 16.37 16.42 16.54 15.98 15.89 16.16 16.33 16.06 15.49 16.15 15.14 15.44 16.15 TFe2O3 2.26 4.62 1.24 1.66 2.21 2.90 2.99 2.34 2.17 2.06 1.13 2.33 1.52 1.83 1.38 MnO 0.08 0.22 0.02 0.22 0.07 0.04 0.02 0.07 0.10 0.08 < 0.01 0.05 < 0.01 0.03 0.01 MgO 0.18 0.19 0.20 0.23 0.22 0.20 0.18 0.18 0.16 0.19 0.19 0.07 0.10 0.20 0.20 CaO 0.99 0.96 1.09 1.18 0.94 0.99 0.94 0.99 1.01 1.02 0.60 0.36 0.37 0.68 0.62 Na2O 4.89 4.78 4.85 5.16 4.53 4.82 4.80 4.96 4.90 4.88 4.06 2.75 2.85 3.58 4.15 K2O 5.13 4.97 5.12 4.78 5.05 4.91 5.10 5.10 5.08 5.09 6.07 6.63 6.44 6.02 5.90 P2O5 0.20 0.20 0.22 0.23 0.20 0.19 0.21 0.19 0.19 0.21 0.11 0.13 0.11 0.12 0.11 烧失量 0.82 1.46 0.90 0.88 1.24 0.96 1.05 0.78 0.83 0.74 1.34 2.18 1.53 1.95 1.36 总计 99.51 99.72 99.52 99.55 99.73 99.61 99.60 99.77 99.54 99.09 99.22 99.23 99.29 99.41 99.34 K2O+Na2O 10.02 9.75 9.97 9.94 9.58 9.73 9.90 10.06 9.98 9.97 10.13 9.38 9.29 9.60 10.05 K2O/Na2O 1.05 1.04 1.06 0.93 1.11 1.02 1.06 1.03 1.04 1.04 1.50 2.41 2.26 1.68 1.42 σ 4.00 4.06 3.80 3.88 3.62 3.74 3.90 3.94 3.91 3.91 3.80 3.48 3.10 3.50 3.86 A/NK 1.22 1.17 1.21 1.20 1.28 1.21 1.18 1.18 1.20 1.19 1.17 1.38 1.30 1.24 1.22 A/CNK 1.07 1.04 1.06 1.04 1.13 1.06 1.05 1.05 1.06 1.05 1.08 1.31 1.23 1.13 1.13 Mg# 15.66 8.75 27.32 24.41 18.83 13.85 12.30 15.20 14.66 17.69 28.15 6.54 13.29 20.30 25.25 Li 35.3 35.0 38.7 36.9 40.4 38.1 38.0 38.4 36.5 36.2 11.5 32.0 20.3 17.3 11.4 Be 7.39 8.62 6.82 6.51 6.97 7.93 8.61 7.55 7.17 7.18 5.14 5.18 4.56 5.24 5.63 Sc 1.84 1.72 2.01 2.00 2.54 1.99 2.20 1.94 1.62 1.82 1.44 2.40 2.38 1.57 1.70 V 31.3 33.1 31.6 33.5 35.9 32.7 34.3 31.4 30.0 32.8 22.4 27.9 31.6 23.0 22.9 Cr 6.18 4.67 7.02 5.88 6.21 5.68 5.42 6.68 6.12 5.25 4.72 6.13 7.06 4.65 4.66 Co 4.17 12.7 1.45 3.65 3.30 4.51 2.22 4.17 4.66 3.47 1.18 3.08 1.09 2.54 1.80 Ni 4.49 8.84 4.26 14.0 4.60 8.07 3.67 7.27 7.07 4.01 1.51 3.60 1.70 2.78 2.15 Cu 3.96 5.75 3.10 4.13 3.98 4.37 5.21 4.86 3.58 4.73 5.11 13.1 10.8 7.99 5.57 Zn 38.3 75.8 19.8 66.2 30.0 53.6 43.7 43.7 43.1 26.8 12.9 30.6 12.5 20.8 23.1 Ga 21.0 20.5 21.7 21.9 22.0 21.2 20.9 21.1 20.7 20.8 20.0 21.6 19.5 20.5 21.1 Ge 1.06 1.07 1.14 1.23 1.24 1.14 1.10 1.08 1.07 1.02 0.91 1.00 0.92 0.99 0.91 Rb 193 197 216 190 208 214 222 209 208 203 348 536 509 372 359 Sr 1241 1112 1191 1244 1133 1241 1218 1256 1268 1200 573 482 425 534 653 Y 10.1 14.0 12.9 18.3 15.0 18.0 12.8 10.8 10.3 8.12 5.85 10.9 7.45 8.47 7.36 Zr 154 155 157 164 176 156 153 160 158 204 172 182 192 177 189 Nb 22.2 23.1 25.0 24.9 25.9 23.7 23.5 22.7 22.1 22.9 18.5 19.8 19.7 18.8 19.0 Cs 4.48 5.10 4.73 4.66 4.71 4.74 4.69 4.71 4.78 5.05 4.50 5.20 4.95 4.83 4.02 Ba 2174 2044 1949 1864 1978 1932 2014 2040 2095 2056 1523 1509 1439 1516 1568 Hf 4.46 4.66 4.68 4.76 5.13 4.57 4.52 4.62 4.53 5.56 5.44 5.90 5.92 5.62 5.83 Ta 1.22 1.31 1.38 1.32 1.41 1.29 1.30 1.24 1.21 1.25 0.89 0.99 0.96 0.93 0.92 Pb 44.3 46.6 46.1 45.4 48.7 44.0 66.3 563 46.0 43.5 40.5 46.1 45.3 45.8 48.3 Th 37.5 38.4 44.7 43.3 44.3 41.5 42.5 39.5 38.7 39.4 34.6 34.3 30.7 35.9 39.1 U 13.1 16.4 11.5 11.6 12.8 9.96 14.3 11.3 10.8 11.1 11.6 9.09 11.1 17.1 18.7 La 50.5 47.1 68.4 125 94.3 74.6 54.8 48.4 51.4 46.5 37.9 56.0 31.9 52.3 47.2 Ce 125 106 97.4 138 133 112 88.1 116 109 135 55.8 71.4 49.5 77.4 74.7 Pr 8.82 8.03 11.6 22.4 19.0 13.3 9.03 7.74 8.19 7.26 6.10 9.38 5.65 9.52 7.95 Nd 29.4 27.9 39.7 72.8 63.5 44.9 30.8 25.9 27.4 23.7 19.9 29.7 18.3 30.0 24.9 Sm 4.40 4.38 5.74 9.91 9.31 6.61 4.70 3.91 4.18 3.54 2.78 4.38 2.78 4.32 3.54 Eu 1.31 1.33 1.58 2.25 2.13 1.75 1.43 1.26 1.31 1.17 0.83 1.19 0.83 1.14 1.01 Gd 3.32 3.74 4.15 6.79 6.29 5.10 3.65 3.15 3.19 2.79 1.97 3.32 2.04 3.14 2.58 Tb 0.37 0.45 0.46 0.71 0.66 0.57 0.43 0.36 0.37 0.30 0.22 0.40 0.26 0.36 0.30 Dy 1.89 2.32 2.20 3.24 3.09 2.80 2.19 1.86 1.88 1.57 1.13 2.02 1.40 1.75 1.47 Ho 0.34 0.44 0.39 0.52 0.51 0.49 0.41 0.34 0.34 0.29 0.20 0.35 0.26 0.30 0.26 Er 0.97 1.25 1.10 1.38 1.38 1.35 1.17 0.99 0.98 0.85 0.59 0.99 0.76 0.84 0.75 Tm 0.15 0.18 0.16 0.18 0.19 0.19 0.17 0.15 0.15 0.13 0.094 0.15 0.12 0.12 0.11 Yb 0.93 1.16 0.99 1.10 1.20 1.18 1.13 0.96 0.95 0.89 0.62 0.95 0.79 0.78 0.76 Lu 0.15 0.18 0.16 0.16 0.18 0.18 0.18 0.15 0.14 0.14 0.098 0.14 0.12 0.12 0.12 (La/Yb)N 54.04 40.72 69.23 114.09 78.78 63.37 48.64 50.65 54.28 52.55 60.85 58.78 40.37 67.08 61.89 δEu 1.05 1.00 0.99 0.84 0.85 0.92 1.06 1.10 1.10 1.14 1.08 0.96 1.07 0.95 1.02 ∑REE 227.28 204.21 234.06 384.79 334.69 265.00 198.14 211.46 209.14 223.81 128.23 180.42 114.68 182.01 165.67 LREE/HREE 26.99 20.02 23.40 26.32 23.82 21.36 20.23 25.57 25.16 31.17 24.97 20.69 18.94 23.54 25.08 注：主量元素含量单位为%，微量和稀土元素含量单位为10-6
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