Response of magmatic activity to the closure of Changning-Menglian Palaeothys in western Yunnan: Evidence from geo-geochemical study on granite in southern section of Lincang pluton
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摘要:
临沧花岗岩岩体（简称临沧岩体）是滇西澜沧江地区南段出露面积最大的复式岩基，也是特提斯构造域的重要组成单元，其岩石类型主要为黑云母二长花岗岩。锆石样品得出的定年结果为225.1±6.1 Ma，表明这些花岗岩类侵位于晚三叠世。临沧花岗岩的K2O/Na2O值大于1，铝饱和指数A/CNK=1.05~1.95，属高钾钙碱性过铝-强过铝质S型花岗岩。岩石总体上富集轻稀土元素（（La/Yb）N=6.06~21.01），亏损重稀土元素，并显示出明显的负Eu异常（δEu=0.20~0.38）。岩石地球化学特征指示，临沧花岗岩应为昌宁-孟连古特提斯封闭过程的产物，原岩为中下地壳贫粘土的变质砂岩和变质泥岩，其Pearce构造判别图解中的同碰撞属性是对古特提斯封闭及保山-思茅地块碰撞的响应。
Abstract:Lincang intrusive, as the largest exposed compound batholith of southern Lancangjiang in western Yunnan, and an important component of tethys tectonic domain, is mainly biotite monzogranite in lithology.The zircon sample collected frome granite was dated to 225.1±6.1 Ma, suggesting that these intrusives were emplaced during the Late Triassic.The K2O/Na2O value of Lincang granite is greater than 1, and the aluminum saturation index A/CNK ranges from1.05 to 1.95, indicating that Lancang intursives are derived from S-type granite with high potassium calcium basic peraluminum-super peraluminum.Intursives are remarkably characterized by enriched LREE and depleted HREE with (La/Yb)N=6.06~21.01 and δEu of 0.20~0.38.The petro-geochemistry of intusives indicates that the Lincang granite should be the product of the Changning-Menglian Palaeothys closure process, and the original rock of Lincang granite is lithologically clay-poor metamorphic sandstone and metamorphic mudstone in the middle and lower crust.The syncollision represented in its Pearce structure discrimination diagram is a response to the Palaeothys ocean closure and the Baoshan-Simao block collision.
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Key words:
- Lincang granite /
- U-Pb zircon chronology /
- Palaeothys /
- continental collision
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表 1 硝塘花岗岩LA-ICP-MS锆石U-Th-Pb分析结果
Table 1. U-Th-Pb ages of LA-ICP-MS zircon for Xiaotang granite
点号 Th/10-6 U/10-6 Th/U 比值 年龄/Ma 207Pb/206Pb ±1σ 207Pb/235U ±1σ 206Pb/238U ±1σ 207Pb/206Pb ±1σ 207Pb/235U ±1σ 206Pb/238U ±1σ LC-102-1.1 881 2490 0.35 0.05581 0.00247 0.26753 0.01135 0.03561 0.00050 456 98 241 9 226 3 LC-102-2.1 459 1788 0.26 0.05440 0.00270 0.26146 0.01250 0.03564 0.00060 387 111 236 10 226 4 LC-102-3.1 729 2553 0.29 0.06210 0.00279 0.29061 0.01229 0.03457 0.00044 676 92 259 10 219 3 LC-102-4.1 490 1382 0.36 0.06474 0.00419 0.27939 0.01613 0.03225 0.00050 765 132 250 13 205 3 LC-102-5.1 1083 6811 0.16 0.05565 0.00209 0.27122 0.00921 0.03546 0.00043 439 83 244 7 225 3 LC-102-6.1 532 1507 0.35 0.05067 0.00216 0.24801 0.01047 0.03560 0.00048 233 98 225 9 225 3 LC-102-7.1 698 1629 0.43 0.05211 0.00223 0.25625 0.01111 0.03562 0.00048 300 98 232 9 226 3 LC-102-8.1 543 1607 0.34 0.05211 0.00238 0.25740 0.01216 0.03555 0.00060 300 104 233 10 225 4 LC-102-9.1 710 3481 0.20 0.04942 0.00148 0.24390 0.00764 0.03562 0.00040 169 70 222 6 226 3 LC-102-10.1 575 1595 0.36 0.05171 0.00206 0.25576 0.01079 0.03559 0.00042 272 86 231 9 225 3 LC-102-11.1 533 2219 0.24 0.04989 0.00170 0.24552 0.00856 0.03554 0.00038 191 112 223 7 225 2 LC-102-12.1 774 1713 0.45 0.05351 0.00243 0.26134 0.01154 0.03563 0.00061 350 97 236 9 226 4 LC-102-13.1 518 1601 0.32 0.05131 0.00238 0.25297 0.01234 0.03551 0.00060 254 110 229 10 225 4 LC-102-14.1 643 2385 0.27 0.05342 0.00206 0.26155 0.00984 0.03558 0.00053 346 87 236 8 225 3 LC-102-15.1 696 1340 0.52 0.05223 0.00269 0.25567 0.01252 0.03553 0.00059 295 119 231 10 225 4 注：测试单位为中国地质大学(武汉)地质过程与矿产资源国家重点实验室 
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表 2 硝塘花岗岩的主量、微量和稀土元素含量
Table 2. Contents of major, trace and rare earth elements of Xiaotang granite
样号 LC-093 LC-101 LC-107 LC-108 LC-140 LC-141 LC-142 LC-143 SiO2 73.96 73.24 75.68 74.94 74.69 75.62 74.8 78.13 TiO2 0.25 0.196 0.113 0.14 0.251 0.141 0.14 0.136 Al2O3 13.28 13.53 12.89 13.16 14.6 12.89 13.28 11.9 Fe2O3 0.458 0.116 0.091 0.44 0.4 0.035 0.298 0.324 FeO 1.54 1.62 0.981 0.844 0.344 0.981 0.926 0.145 MnO 0.037 0.064 0.043 0.034 0.004 0.017 0.022 0.003 MgO 0.808 0.767 0.424 0.472 0.542 0.517 0.679 0.303 CaO 0.196 1.56 0.979 0.864 0.085 0.33 0.224 0.126 Na2O 2.52 3.28 3.11 3.05 0.086 3 2.94 1.71 K2O 5.12 4.28 4.72 4.6 6.66 4.97 5.05 5.65 P2O5 0.064 0.072 0.055 0.062 0.026 0.044 0.036 0.029 烧失量 1.356 0.696 0.583 0.972 1.374 1.008 1.338 1.11 总量 99.659 99.487 99.749 99.642 99.127 99.624 99.799 99.631 Na2O+K2O 7.64 7.56 7.83 7.65 6.75 7.97 7.99 7.36 K2O/Na2O 2.03 1.30 1.52 1.51 77.44 1.66 1.72 3.30 A/CNK 1.32 1.05 1.07 1.14 1.95 1.18 1.24 1.30 Sr 57.60 68.4 37.6 39.9 15.2 38.3 41.0 27.8 V 38.8 35.2 18.8 25.7 36.3 26.4 30.4 25.3 Cr 26.9 26.4 11.2 13.7 12.8 12.8 17.1 11.3 Co 4.72 4.5 1.28 2.28 1.76 1.84 1.62 2.62 Ni 6.04 4.66 2.9 4.05 3.9 2.54 3.14 2.91 Sc 8.36 6.8 4.16 5.9 7.6 6.36 5.17 5.41 Ga 19.8 16.9 13.9 15 0.23 0.24 0.5 0.28 Rb 260 323 294 356 430 312 324 316 Y 24.6 31 15.6 20.6 12.9 13.9 18.1 22.9 Zr 123 84.8 64.7 71.2 128 83.7 84 80.8 Nb 17.6 15.2 10.5 10.5 14.8 13.2 14.8 12.4 Cs 11.6 21 19.7 30 9.3 10.6 13.7 7.35 Pb 67.4 47.4 45.8 49.2 15.9 43.4 37.4 19.0 Ba 476 279 180 282 242 182 214 316 Th 26.4 21.4 16.1 17.3 27 23.1 21.8 22.8 U 7.83 6.18 23.7 20.8 3.8 20.1 19.7 12.0 La 34.6 26.8 16.2 20.4 37.2 22.2 20.7 72.8 Ce 71.3 55.4 33.5 44.2 77.8 46.8 44.5 157 Pr 8.08 6.5 3.77 5.2 9.06 5.62 5.58 14.9 Nd 28.3 23 14 18.2 31.5 20.2 20.4 55.8 Sm 5.58 5.17 2.96 4.1 5.61 4.3 4.78 10.2 Eu 0.52 0.5 0.31 0.48 0.4 0.3 0.34 0.6 Gd 4.68 4.68 2.53 3.55 4.02 3.28 3.67 7.61 Tb 0.75 0.9 0.45 0.66 0.47 0.5 0.64 1.03 Dy 3.44 5.23 2.43 3.72 1.94 2.42 3.32 4.77 Ho 0.64 0.99 0.45 0.7 0.33 0.41 0.61 0.85 Er 1.86 2.92 1.3 2.02 1.04 1.23 1.81 2.51 Tm 0.3 0.49 0.21 0.36 0.17 0.21 0.32 0.41 Yb 2.04 3.17 1.6 2.3 1.27 1.58 2.32 2.97 Lu 0.34 0.5 0.23 0.34 0.22 0.25 0.39 0.44 Nb/Ta 7.27 4.32 4.17 3.70 4.61 3.85 3.49 5.85 Zr/Hf 28.74 23.69 24.69 23.12 25.05 26.57 21.48 25.09 Ga*104/Al 2.72 2.29 2.00 2.10 2.39 2.35 2.40 2.32 ΣREE 162.43 136.25 79.94 106.23 171.03 109.30 109.38 331.89 LREE/HREE 3.84 2.35 2.85 2.70 7.23 4.18 3.09 7.16 δEu 0.30 0.30 0.34 0.38 0.25 0.23 0.24 0.20 注：A/CNK=Al2O3/(CaO+Na2O+K2O)摩尔比[28]；主量元素含量单位为%，微量和稀土元素含量单位为10-6；测试单位为澳实分析检测(广州)公司
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