The Formation Age of Intrusions from Tudigou–Chigou Region in Southern Margin of Shangdan Subduction–Accretion Belt and Its Geological Significance
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摘要:
位于商丹俯冲增生带南缘山阳–柞水地区的侵入岩类在形成时代主要集中在新元古代（885～621 Ma）和中晚三叠—早白垩世（233～132 Ma）2个阶段，且后者多为秦岭造山带印支期—燕山期造山活动的产物。该构造带内土地沟至池沟地区出露有部分与成矿作用有关的小岩体，锆石LA–ICP MS U–Pb同位素测年结果表明其形成时代为144.4～158.8 Ma，属于晚侏罗世—早白垩世侵入岩类。岩石地球化学特征显示出富集大离子亲石元素，亏损高场强元素，高Sr、低Y的特征。结合区域岩浆岩演化研究，可以认为土地沟–池沟地区晚侏罗—早白垩世侵入岩类的形成可能与西太平洋活动应力作用以及区内的北西向构造系统约束具有密切关联。受此影响，以中南秦岭地区在后碰撞–后造山阶段拆沉和幔源物质上涌作用下，地壳物质发生重熔从而在山阳–柞水一带形成一系列中酸性侵入岩类。
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关键词:
- 商丹俯冲增生杂岩带 /
- 晚侏罗世—早白垩世岩浆作用 /
- 岩石成因
Abstract:Located in the south margin of Shangdan sunduction–accretion belt, intrusive rocks in Shanyang–Zhashui region are mainly formed in two stages: the former is Neoproterozoic (885～621 Ma), and the latter is Middle–Late Triassic and Early Cretaceous (233～132 Ma) that was a result of Qinling orogenic event during Indosinian–Yanshan period. Zirons LA–ICP–MS U–Pb dating of intrusions in Tudigou–Chigou region show them formed between 144.4 Ma and 158.8 Ma, during Late Jurassic and Early Cretaceous. Geochemical study on these rocks reveals, they are enriched in large ion lithophile element (LILE) and depleted in high field strength elements (HFSE), with a high ratio of Sr/Y. Combined with the research on regional magmatic evolution, intrusions formed between Late Jurassic and Early Cretaceous in Tudigou and Chigou may be controlled by the movement of western Pacific and NE faults. And also, with the crustal delamination and the addition of fluid from subduction–accretion belt in post–collision and post–orogenic stages, intrusions from Shanyang– Zhashui region are formed by the melting of crust in Middle–south Qinling.
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图 5 土地沟–池沟地区中酸性岩体SiO2–（Na2O+K2O）图（a）（Irvine et al.，1971； Middlemost，1994）和SiO2–K2O图（b）（Richwood，1989）
Figure 5.
图 7 土地沟–池沟地区中酸性岩体R1–R2成因环境判别图（Batchelor et al.，1985）
Figure 7.
表 1 土地沟–池沟地区岩体地质特征一览表
Table 1. Geological characteristics of intrusions in Tudigou–Chigou region
地名 围岩 侵入岩组合 采集岩性/形成时代 蚀变 矿化类型 池沟 中泥盆世地层：长石石英砂岩、石英砂岩夹薄层粉砂质板岩、板岩，夹大理岩 花岗闪长岩、二长花岗岩、石英闪长岩和石英闪长玢岩 花岗闪长岩（14CG1）/144.4 Ma 围岩具角岩化、矽卡岩化，岩体与地层接触部位普遍发育接触变质晕；岩体：钾化、绢云母化、硅化、绿泥石化化，其次有黏土化、黑云母化 Cu、Mo 闪长玢岩
（14CG4）/150.7 Ma白沙沟 石英闪长玢岩
（13BS01）/151.0 Ma围岩具角岩化、矽卡岩化；岩体：不同程度的绿泥、绿帘石化 Au、Cu 土地沟 似斑状花岗岩和石英闪长（玢）岩、爆破角砾岩 石英闪长玢岩
（14TD1）/158.8 Ma岩体具钾化、绢云母化、碳酸盐化、高岭土化 Mo 
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表 2 土地沟–池沟地区中酸性岩体锆石U–Pb同位素物质成分组成表
Table 2. Zircon LA–ICP MS U–Pb analytical data of the intrusions in Tudigou–Chigou region
样品 比值 年龄（Ma） 组成（10−6） 207Pb/206Pb ±% 207Pb/235U ±% 206Pb/238U ±% 208Pb/232Th ±% 207Pb/206Pb±1σ 207Pb/235U±1σ 206Pb/238U±1σ 208Pb/232Th±1σ 204Pb 206Pb 207Pb 208Pb 232Th 238U Th/U 池沟花岗闪长岩（14CG1），n=28 −01 0.0494 0.159 0.1525 0.454 0.0223 0.038 0.0063 0.017 169 39 144 4 143 2 129 3 ＜2.08 30.1 1.61 4.38 324 319 1.01 −03 0.0517 0.269 0.1615 0.765 0.0226 0.057 0.0064 0.028 273 63 152 7 144 4 130 6 ＜2.51 19.9 1.26 2.95 213 220 0.97 −04 0.0522 0.244 0.1674 0.714 0.0232 0.053 0.0082 0.034 296 57 157 6 148 3 166 7 ＜2.81 17.1 0.95 2.15 123 169 0.72 −06 0.0500 0.295 0.1574 0.844 0.0228 0.063 0.0058 0.032 198 74 149 7 145 4 119 6 ＜2.10 24.1 1.30 2.75 224 251 0.89 −07 0.0520 0.186 0.1618 0.530 0.0225 0.042 0.0067 0.021 288 42 152 5 144 3 137 4 ＜1.33 33.6 1.94 5.04 358 365 0.97 −08 0.0532 0.188 0.1694 0.549 0.0231 0.043 0.0065 0.021 338 41 159 5 147 3 132 4 ＜1.74 34.6 1.95 4.19 304 341 0.88 −11 0.0519 0.286 0.1625 0.816 0.0226 0.059 0.0075 0.038 285 68 153 7 145 4 151 8 ＜2.40 13.3 0.77 1.44 92.2 137 0.67 −13 0.0519 0.280 0.1575 0.772 0.0220 0.057 0.0075 0.039 282 66 149 7 140 4 153 8 ＜2.21 19.1 1.17 2.1 134 209 0.64 −18 0.0519 0.370 0.1597 1.039 0.0222 0.072 0.0080 0.052 285 91 150 9 142 5 162 10 ＜2.40 11.9 0.75 1.27 82.7 128 0.64 −19 0.0523 0.240 0.1589 0.663 0.0220 0.051 0.0078 0.034 302 54 150 6 140 3 157 7 ＜2.42 20.5 1.23 2.29 153 225 0.67 −20 0.0486 0.280 0.1502 0.793 0.022 0.059 0.0074 0.038 131 74 142 7 143 4 150 8 ＜2.17 19.1 1.00 2.31 157 206 0.76 −22 0.0499 0.135 0.1557 0.391 0.022 0.035 0.0072 0.017 195 31 147 3 144 2 145 3 ＜2.27 51.4 2.72 8.55 615 535 1.14 −23 0.0521 0.173 0.1634 0.499 0.0227 0.040 0.0070 0.022 290 39 154 4 145 3 142 4 ＜2.73 21.5 1.14 2.42 179 221 0.80 −24 0.0524 0.179 0.1624 0.509 0.0224 0.041 0.0073 0.023 306 39 153 4 143 3 148 5 ＜1.50 33.7 1.90 4.50 313 356 0.87 −25 0.0498 0.185 0.1566 0.536 0.0227 0.044 0.0073 0.024 188 45 148 5 145 3 147 5 ＜3.77 27.4 1.45 3.32 235 281 0.83 −26 0.0500 0.207 0.1561 0.592 0.0226 0.047 0.0074 0.026 196 51 147 5 144 3 151 5 ＜2.36 34.7 1.91 5.33 377 366 1.02 −27 0.0493 0.197 0.1582 0.583 0.0232 0.046 0.0070 0.027 166 50 149 5 148 3 141 5 ＜2.28 23.5 1.26 2.58 194 246 0.78 −29 0.0497 0.167 0.1581 0.491 0.0230 0.041 0.0075 0.023 183 40 149 4 147 3 153 5 ＜2.76 36.1 1.94 4.95 347 381 0.91 池沟闪长玢岩（14CG1），n=20 −02 0.0513 0.283 0.1691 0.850 0.0239 0.063 0.0078 0.044 254 68 159 7 152 4 158 9 ＜2.41 14.2 0.76 1.47 92.7 143 0.64 −06 0.0520 0.222 0.1713 0.667 0.0238 0.051 0.0081 0.033 288 51 161 6 152 3 164 7 2.41 21.8 1.30 2.69 182 232 0.78 −07 0.0511 0.336 0.1693 1.017 0.0240 0.072 0.0092 0.058 249 84 159 9 153 5 186 12 ＜3.02 10.1 0.53 1.06 63.3 97.4 0.65 −08 0.0461 0.214 0.1478 0.644 0.0232 0.048 0.0075 0.030 4 54 140 6 148 3 152 6 ＜1.67 19.6 0.99 2.60 195 206 0.94 −09 0.0524 0.233 0.1728 0.701 0.0238 0.053 0.0079 0.036 306 53 162 6 152 3 161 7 ＜2.46 20.2 1.14 2.27 158 208 0.76
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续表 2 样品 比值 年龄（Ma） 组成（10−6） 207Pb/206Pb ±% 207Pb/235U ±% 206Pb/238U ±% 208Pb/232Th ±% 207Pb/206Pb±1σ 207Pb/235U±1σ 206Pb/238U±1σ 208Pb/232Th±1σ 204Pb 206Pb 207Pb 208Pb 232Th 238U Th/U −10 0.0507 0.204 0.1672 0.616 0.0238 0.049 0.0074 0.030 231 48 157 5 152 3 150 6 ＜2.99 29.3 1.48 3.27 203 283 0.71 −11 0.0493 0.282 0.1618 0.845 0.0237 0.064 0.0086 0.045 166 73 152 7 151 4 173 9 ＜2.43 18.6 0.96 2.33 153 197 0.77 −12 0.0503 0.278 0.1661 0.838 0.0239 0.062 0.0083 0.045 211 70 156 7 153 4 167 9 ＜2.62 14.4 0.77 1.45 103 146 0.70 −13 0.0504 0.207 0.1630 0.617 0.0234 0.048 0.0078 0.034 213 51 153 5 150 3 158 7 ＜1.68 23.3 1.19 2.39 176 240 0.73 −14 0.0491 0.202 0.1617 0.613 0.0239 0.049 0.0077 0.030 153 51 152 5 152 3 156 6 ＜1.48 25.3 1.34 3.44 259 262 0.98 −16 0.0525 0.314 0.1686 0.918 0.0232 0.066 0.0084 0.051 310 73 158 8 148 4 171 10 ＜2.24 14.1 0.87 1.39 99.9 151 0.66 −17 0.0507 0.169 0.1688 0.522 0.0241 0.043 0.0084 0.031 229 40 158 5 154 3 171 6 ＜2.03 23.7 1.23 2.60 181 234 0.77 −18 0.0502 0.227 0.1645 0.681 0.0237 0.053 0.0079 0.035 207 56 155 6 151 3 161 7 ＜1.80 20.3 1.17 2.47 184 213 0.86 −20 0.0483 0.356 0.1560 1.082 0.0234 0.067 0.0082 0.061 114 103 147 10 149 4 167 12 14.9 16.9 4.65 7.78 75.3 135 0.55 −21 0.0493 0.318 0.1592 0.936 0.0234 0.070 0.0097 0.056 165 82 150 8 149 4 196 11 ＜2.33 20.5 1.07 2.55 170 219 0.77 −22 0.0505 0.213 0.1668 0.647 0.0239 0.051 0.0090 0.041 222 51 157 6 152 3 183 8 ＜2.11 17.0 0.89 1.77 115 171 0.67 −24 0.0477 0.180 0.1573 0.551 0.0239 0.046 0.0084 0.036 85 47 148 5 152 3 171 7 ＜1.79 23.2 1.18 2.23 158 239 0.66 −25 0.0511 0.264 0.1640 0.774 0.0232 0.058 0.0083 0.045 246 64 154 7 148 4 167 9 ＜1.63 21.5 1.23 2.16 166 235 0.70 −26 0.0493 0.220 0.1590 0.658 0.0234 0.050 0.0080 0.034 163 57 150 6 149 3 161 7 ＜3.21 30.1 1.53 4.12 321 322 0.99 −29 0.0514 0.242 0.1635 0.703 0.0230 0.054 0.0090 0.045 261 57 154 6 147 3 181 9 ＜1.69 22.0 1.24 2.57 183 245 0.74 白沙沟石英闪长玢岩（13BS01），n=11 −11 0.0526 0.176 0.1670 0.521 0.0231 0.043 0.0067 0.019 315 39 157 5 147 3 136 4 ＜12792 59.9 55.0 507 1371 156 8.75 −12 0.0523 0.118 0.1647 0.359 0.0229 0.034 0.0062 0.010 302 25 155 3 146 2 125 2 ＜6631 71.8 65.7 879 2590 189 13.6 −13 0.0519 0.231 0.1696 0.693 0.0238 0.053 0.0073 0.030 285 54 159 6 152 3 148 6 ＜6285 26.9 24.5 175 441 68.5 6.44 −16 0.0529 0.166 0.1680 0.493 0.0232 0.041 0.0068 0.021 325 36 158 4 148 3 138 4 ＜1115 36.5 34.0 213 595 94.5 6.30 −17 0.0493 0.281 0.1605 0.838 0.0237 0.064 0.0066 0.036 166 73 151 7 151 4 134 7 ＜2384 33.9 29.5 198 572 85.6 6.68 −19 0.0529 0.206 0.1716 0.613 0.0237 0.049 0.0069 0.026 325 45 161 5 151 3 140 5 1245 27.9 26.2 174 492 70.4 6.98 −21 0.0528 0.202 0.1711 0.602 0.0236 0.048 0.0074 0.028 322 44 160 5 151 3 150 6 ＜1072 31.4 29.5 189 506 79.3 6.38 −24 0.0506 0.151 0.1705 0.471 0.0246 0.042 0.0078 0.032 227 34 160 4 157 3 157 6 ＜851 47.0 42.7 137 359 113 3.16 −26 0.0506 0.118 0.1665 0.367 0.0240 0.036 0.0071 0.020 223 25 156 3 153 2 144 4 ＜736 73.2 66.6 281 814 180 4.50 −27 0.0511 0.207 0.1708 0.634 0.0244 0.051 0.0070 0.029 248 48 160 5 155 3 141 6 ＜517 24.6 22.6 133 395 59.7 6.62 −28 0.0552 0.249 0.1840 0.752 0.0243 0.057 0.0080 0.038 424 51 172 6 155 4 162 8 ＜718 24.6 24.5 138 358 59.9 5.97
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续表 2 样品 比值 年龄（Ma） 组成（10−6） 207Pb/206Pb ±% 207Pb/235U ±% 206Pb/238U ±% 208Pb/232Th ±% 207Pb/206Pb±1σ 207Pb/235U±1σ 206Pb/238U±1σ 208Pb/232Th±1σ 204Pb 206Pb 207Pb 208Pb 232Th 238U Th/U 土地沟石英闪长玢岩（14TDG1），n=16 −01 0.0515 0.145 0.1764 0.463 0.0250 0.041 0.0072 0.021 266 32 165 4 159 3 146 4 ＜589 29.2 27.2 168 487 69.1 7.05 −02 0.0527 0.140 0.1806 0.445 0.0250 0.040 0.0080 0.021 317 29 169 4 159 3 162 4 ＜410 41.7 39.9 272 724 98.2 7.37 −03 0.0496 0.102 0.1698 0.333 0.0249 0.035 0.0075 0.017 180 22 159 3 159 2 152 3 ＜432 83.4 75.2 370 1053 196 5.35 −05 0.0512 0.129 0.1750 0.412 0.0249 0.039 0.0078 0.023 250 27 164 4 159 2 158 5 ＜415 48.8 45.4 211 584 114 5.09 −06 0.0486 0.117 0.1670 0.377 0.0251 0.038 0.0076 0.020 129 27 157 3 160 2 154 4 ＜403 50.4 44.6 247 707 117 6.00 −07 0.0513 0.110 0.1761 0.356 0.0250 0.036 0.0082 0.022 257 23 165 3 159 2 166 4 ＜495 65.5 61.4 233 621 153 4.05 −08 0.0493 0.086 0.1688 0.286 0.0249 0.032 0.0081 0.018 165 19 158 2 159 2 164 4 ＜404 111 100 344 939 261 3.59 −12 0.0525 0.116 0.1796 0.370 0.0249 0.036 0.0081 0.020 310 23 168 3 159 2 164 4 ＜328 61.9 59.8 309 862 144 5.95 −13 0.0530 0.171 0.1804 0.531 0.0248 0.045 0.0095 0.034 331 36 168 5 158 3 191 7 ＜294 42.2 41.4 195 478 98.7 4.83 −14 0.0534 0.123 0.1796 0.384 0.0245 0.036 0.0089 0.027 347 24 168 3 156 2 179 5 391 54.0 53.4 182 479 127 3.75 −15 0.0493 0.148 0.1695 0.468 0.0250 0.043 0.0087 0.032 165 34 159 4 160 3 175 6 ＜228 32.5 29.8 118 319 75.4 4.23 −16 0.0493 0.116 0.1676 0.367 0.0248 0.037 0.0091 0.028 162 26 157 3 158 2 184 6 ＜324 54.3 49.7 167 432 126 3.40 −17 0.0478 0.098 0.1644 0.317 0.0250 0.034 0.0082 0.018 93 22 155 3 159 2 165 4 ＜363 58.7 52.3 319 922 135 6.78 −19 0.0488 0.143 0.1679 0.452 0.0250 0.042 0.0079 0.027 139 33 158 4 160 3 160 5 ＜504 97.7 89.0 406 1232 225 5.47 −20 0.0496 0.088 0.1704 0.288 0.0250 0.032 0.0097 0.022 179 18 160 2 159 2 197 4 ＜176 97.6 90.5 331 819 225 3.64 −22 0.0519 0.143 0.1766 0.445 0.0247 0.041 0.0093 0.031 284 29 165 4 158 3 188 6 279 49.9 48.6 197 517 116 4.45
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续表 3 样号 池沟花岗闪长岩 池沟闪长玢岩 14CG1-1 14CG1-2 14CG1-3 14CG1-4 14CG1-5 14CG4-1 14CG4-2 14CG4-3 14CG4-4 V 61 58 55.3 69.6 70.8 136 131 133 124 Sc 8.48 7.51 8.22 9.77 8.98 14.8 14.5 14.6 15.4 Nb 14.4 14.8 14.1 17.2 16.5 17.8 17.9 18 18.7 Ta 1.18 1.14 1.16 1.43 1.25 1.42 1.35 1.38 1.46 Zr 179 140 134 180 166 225 233 226 235 Hf 5.28 4.12 3.88 5.24 5.01 6.24 6.38 6.28 6.44 Be 2.04 2.33 2.52 2.67 2.43 2.51 2.43 2.49 2.68 Ga 18.9 19.3 19.6 18.6 18.7 21.5 20.1 20.2 20.7 Th 13 15.5 14.4 16.8 18.1 11.7 11.7 12.6 14.3 （La/Sm） N 5.01 6.73 6.90 6.71 6.86 3.70 3.93 4.26 4.27 （Gd/Yb） N 2.32 2.81 2.58 2.94 2.87 2.31 2.34 2.50 2.52 （La/Yb） N 19.24 33.60 30.16 32.64 33.75 13.52 15.06 16.85 18.36 δEu 1.95 1.87 2.21 1.40 1.39 1.46 1.40 1.39 1.38 K2O/Na2O 1.32 0.95 1.00 1.20 1.30 0.83 0.81 0.84 0.89 ACNK 1.24 1.24 1.23 1.23 1.22 1.21 1.17 1.20 1.21
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样号 池沟闪长玢岩 白沙沟石英闪长玢岩 14CG4-5 13BS01-1 13BS01-2 13BS01-3 13BS01-4 13BS01-5 13BS01-6 13BS01-7 SiO2 61.93 63.54 62.74 62.95 63.15 62.92 63.00 63.14 Al2O3 16.22 16.05 16.16 16.23 16.03 16.14 16.12 16.02 Fe2O3 1.84 2.72 3.18 2.88 2.83 2.94 2.48 2.8 FeO 2.79 2.11 2.18 2.15 2.14 2.25 2.55 2.28 CaO 3.76 3.6 3.54 3.49 3.64 3.6 3.46 3.56 MgO 2.93 1.88 1.92 1.93 1.93 1.9 1.94 1.93 K2O 3.43 3.58 3.43 3.57 3.58 3.51 3.55 3.45 Na2O 3.86 4.78 4.88 4.87 4.82 4.89 4.86 4.88 TiO2 0.77 0.63 0.65 0.63 0.65 0.64 0.65 0.65 P2O5 0.56 0.43 0.45 0.44 0.44 0.45 0.46 0.45 MnO 0.08 0.12 0.14 0.12 0.12 0.13 0.12 0.12 LOI 1.81 0.54 0.71 0.69 0.67 0.61 0.8 0.7 La 41.4 40.2 36 42.5 20.8 40.9 39.4 19.4 Ce 83.6 75.4 68.9 80.6 46.1 78.8 77.1 41.2 Pr 9.96 9.22 8.59 9.41 5.77 9.49 9.07 5.59 Nd 39.4 35.2 33.6 36.4 23.1 37.2 34.2 23.2 Sm 6.8 5.98 5.91 6.12 4.56 6.43 6.23 4.58 Eu 2.88 2.44 2.42 2.63 2.08 2.62 2.45 2.02 Gd 5.64 4.8 5.16 5.23 3.86 5.24 5 3.84 Tb 0.81 0.74 0.74 0.77 0.56 0.79 0.73 0.58 Dy 4.06 3.56 3.71 3.79 3.08 3.84 3.65 3.11
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续表 3 样号 池沟闪长玢岩 白沙沟石英闪长玢岩 14CG4-5 13BS01-1 13BS01-2 13BS01-3 13BS01-4 13BS01-5 13BS01-6 13BS01-7 Ho 0.75 0.69 0.73 0.72 0.59 0.74 0.68 0.6 Er 2.01 1.94 2.04 2.07 1.68 2.11 1.91 1.66 Tm 0.3 0.28 0.3 0.31 0.26 0.32 0.27 0.25 Yb 1.98 1.94 1.99 2.02 1.7 2.11 1.82 1.68 Lu 0.3 0.28 0.3 0.3 0.26 0.32 0.29 0.25 Y 18.8 17.4 18 17.9 12.2 18.9 17.6 12.9 Cu 67.4 75.4 82 74.8 69.3 86.9 80.1 80.6 Pb 9.65 42.3 41.3 27 47.5 35.7 43.1 31.3 Zn 46.3 104 85.7 80.1 105 97.3 84.1 76.4 Cr 53.3 15.8 22.6 18.1 15.6 19.2 18 18.7 Ni 26.6 11.4 15 12.2 10.8 14 11.1 12.2 Co 10 9.82 9.94 9.43 10 10.3 9.18 8.75 Li 11.6 11.7 11.5 11.5 11.8 12.1 12 12 Rb 73.7 95.2 57.8 79.9 20.5 74.2 75.7 22 Sr 1140 1320 1230 1320 1220 1330 1270 1020 Ba 3940 3610 3690 4040 3800 3940 3580 3640 V 123 91.4 101 102 100 99.9 94.7 99.6 Sc 14.8 11.7 10.2 12.4 7.03 11.8 10.8 7.46 Nb 19.2 17.2 17.8 17.4 18.2 17.6 16.8 16.3 Ta 1.48 1.36 1.35 1.34 1.45 1.43 1.33 1.28 Zr 243 192 207 209 219 218 177 195 Hf 6.51 5.48 5.83 5.84 6.23 5.94 4.97 5.55 Be 2.33 2.84 2.72 3.13 2.98 2.82 2.32 2.68 Ga 20.5 20.4 20.1 21.3 20.5 21.3 20 19.8 Th 13.6 11.2 9.96 10.2 5 10.1 9.25 3.93 （La/Sm） N 3.93 4.34 3.93 4.48 2.94 4.11 4.08 2.73 （Gd/Yb） N 2.36 2.05 2.15 2.14 1.88 2.05 2.27 1.89 （La/Yb） N 15.00 14.86 12.98 15.09 8.78 13.90 15.53 8.28 δEu 1.42 1.39 1.34 1.42 1.52 1.38 1.34 1.47 K2O/Na2O 0.89 0.75 0.70 0.73 0.74 0.72 0.73 0.71 ACNK 1.20 1.07 1.08 1.08 1.06 1.07 1.07 1.07
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表 3 土地沟–池沟地区中酸性岩体主量元素（%）和微量元素（10−6）地球化学数据表
Table 3. Major elements (%) and trace elements (10−6) compositions of the intrusions in Tudigou–Chigou region
样号 池沟花岗闪长岩 池沟闪长玢岩 14CG1-1 14CG1-2 14CG1-3 14CG1-4 14CG1-5 14CG4-1 14CG4-2 14CG4-3 14CG4-4 SiO2 68.06 67.5 68.13 67.61 68.33 60.57 60.71 60.53 61.88 Al2O3 16.32 16.43 16.41 16 15.63 16.31 16.21 15.99 16.21 Fe2O3 1.25 1.45 1.12 1.33 1.34 2.49 2.46 2.73 2 FeO 0.59 1.07 0.93 1.08 0.85 3.14 3.07 3.08 2.71 CaO 1.65 2.13 2.03 1.99 1.88 4.04 4.11 3.95 3.69 MgO 1.35 1.24 1.19 1.42 1.44 2.91 2.93 3.02 2.92 K2O 5.01 4.01 4.21 4.55 4.72 3.18 3.27 3.22 3.42 Na2O 3.8 4.22 4.23 3.79 3.62 3.84 4.02 3.82 3.84 TiO2 0.44 0.4 0.39 0.46 0.47 0.77 0.76 0.78 0.75 P2O5 0.32 0.27 0.29 0.33 0.33 0.53 0.55 0.57 0.55 MnO 0.02 0.02 0.02 0.02 0.02 0.09 0.08 0.08 0.07 LOI 1.19 1.26 1.06 1.4 1.37 2.14 1.82 2.16 1.92 La 22.8 34.2 32.8 45.5 52.7 35.8 40.1 43 48.9 Ce 42.4 61.1 56.2 82.9 92.1 73.6 78.5 82.8 95.1 Pr 4.57 6.33 5.7 8.68 9.51 9.01 9.51 10 11.4 Nd 16 21.8 19.6 29.1 31.9 35.7 37.3 39.5 43 Sm 2.94 3.28 3.07 4.38 4.96 6.24 6.58 6.52 7.39 Eu 1.69 1.74 1.97 1.81 1.99 2.74 2.72 2.72 2.95 Gd 2.38 2.48 2.43 3.55 3.88 5.3 5.4 5.52 5.82 Tb 0.34 0.34 0.34 0.49 0.57 0.78 0.76 0.79 0.84 Dy 1.78 1.66 1.62 2.31 2.55 3.68 3.77 3.7 4.2 Ho 0.33 0.3 0.3 0.4 0.44 0.69 0.7 0.68 0.74 Er 0.88 0.78 0.82 1.02 1.18 1.97 1.99 1.93 2 Tm 0.13 0.11 0.12 0.15 0.17 0.3 0.3 0.28 0.3 Yb 0.85 0.73 0.78 1 1.12 1.9 1.91 1.83 1.91 Lu 0.13 0.11 0.11 0.15 0.16 0.29 0.27 0.27 0.28 Y 8.12 7.51 7.44 10.3 11.8 17.9 17.3 17.1 18.3 Cu 836 1380 921 1880 1300 90.3 72.4 96.2 85.5 Pb 13.6 18.5 58.2 7.47 27.3 29.4 19.1 23.8 34.3 Zn 26.6 26.8 24.2 27.3 27.7 56 54.9 49.4 47.8 Cr 16.2 16.7 14.5 17.4 16.6 57.7 50.7 52.2 54.1 Ni 10.5 18.8 13.5 15.8 10.8 28 25.8 26.4 27.1 Co 7.38 13 10.8 10.5 8.87 12.1 12.2 12.1 10.2 Li 7.67 8.43 6.83 9.22 8.83 10.1 8.48 10 13.1 Rb 109 82.5 128 93.1 144 62.7 72.1 73.2 96.2 Sr 820 1100 1210 1000 1100 1210 1250 1260 1250 Ba 3260 3160 3380 3120 3330 3970 3960 3840 3970
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