Zircon U-Pb age, petrogenesis and teceonic setting of the Yabulai adakite, northern Alxa Block, Inner Mongolia
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摘要:
雅布赖地区位于阿拉善地块北缘，埃达克岩岩石类型主要为闪长岩和石英闪长岩。用LA-ICP-MS方法测得埃达克岩中的锆石206Pb/238U年龄为275±1 Ma（MSWD=1.00，n=27，闪长岩）和277±2 Ma（MSWD=0.64，n=26，石英闪长岩），故认为雅布赖地区埃达克岩侵位年龄为275±1~277±2 Ma，形成时代为早二叠世。地球化学特征表明，该岩体具有较高的SiO2（60.56%~63.41%）、Al2O3（15.86%~17.33%）、Sr（572×10-6~758×10-6）含量，较低的MgO（1.45%~3.06%）、Y（11.10×10-6~14.7×10-6）、Yb（1.06×10-6~1.55×10-6）含量，富集大离子亲石元素K、Rb、Ba、Sr等，亏损高场强元素Ta、Nb、Ti、P等。岩石重稀土元素强烈亏损，轻、重稀土元素分馏明显，Eu异常较弱（0.81 < δEu < 1.04），Mg#值较高（38~53），Y/Yb值为7.35~11.89，Na2O/K2O值为1.18~1.77，具有C型埃达克岩特征，为拆沉下地売部分熔融产生的流体与地幔橄榄岩相互作用形成的产物。结合前人研究，其可能形成于碰撞后伸展环境。
Abstract:Yabulai adakite is located in the western part of Yabulai-Nuorigong-Honggueryulin belt, northern Alxa Block.The main rock types of the Yabulai adakite are diorite and quartz diorite.The LA-ICP-MS zircon U-Pb dating results are 275±1 Ma(MSWD=1.00, n=27, diorite) and 277±2 Ma(MSWD=0.64, n=26, quartz diorite), which shows that the ages of the adakite are between 275 Ma and 277 Ma, suggesting a product of Early Permian.Geochemical characteristics show that the Yabulai adakite with high content of SiO2(60.56%~63.41%), Al2O3 (15.86%~17.33%), Sr(572×10-6~758×10-6) and low content of MgO(1.45%~3.06%), Y(11.1×10-6~14.7×10-6), Yb(1.06×10-6~1.55×10-6), enrichment of large ion lithophile elements(such as K, Rb, Ba and Sr), and depletion of high field-strength elements(such as Ta, Nb, Ti and P).The Yabulai adakite is typical C-type adakite with high content of Mg#(38~53), the ratio of Y/Yb is between 7.35 and 11.89, and Na2O/K2O is between 1.18 and 1.77;in addition, it exhibits significant fractionation between LREE and HREE and is depleted in HREE with slight Eu anomaly(0.81 < δEu < 1.04).The authors hold that the Yabulai adakite was formed by partial melting of delaminated lower crust and interaction with the mantle peridotite, and magmatic mixing was experienced during diagenesis.Combined with previous studies, the authors hold that the Yabulai adakite might have been formed in a post-collision extension stage.
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Key words:
- adakite /
- zircon U-Pb dating /
- Yabulai /
- magma mixing /
- Alxa Block
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表 1 雅布赖地区埃达克岩闪长岩和石英闪长岩LA-ICP-MS锆石U-Th-Pb同位素测试结果
Table 1. LA-ICP-MS zircon U-Th-Pb data of diorite and quartz diorite of the Yabulai adakite
测点号 元素含量/10-6 Th/U 同位素比值 同位素年龄/Ma Pb Th U 207Pb/
206Pb1σ 207Pb/
235U1σ 206Pb/
238U1σ 207Pb/
206Pb1σ 207Pb/
235U1σ 206Pb/
238U1σ 谐和
度/%TWD3132-1-1闪长岩 1 35.3 664 588 1.13 0.0504 0.0012 0.3024 0.0073 0.0437 0.0006 213 90 268 5.7 276 3.8 97 2 13.8 181 234 0.77 0.0517 0.0017 0.3195 0.0111 0.0449 0.0007 333 74 282 8.6 283 4.5 99 3 21.9 334 382 0.87 0.0532 0.0013 0.3148 0.0080 0.0429 0.0004 345 56 278 6.1 271 2.6 97 4 21.2 330 367 0.90 0.0521 0.0010 0.3099 0.0066 0.0431 0.0005 300 44 274 5.1 272 3.3 99 5 35.4 467 606 0.77 0.0507 0.0007 0.3148 0.0059 0.0450 0.0006 228 33 278 4.5 284 4.0 97 6 17.0 197 271 0.73 0.0518 0.0010 0.3446 0.0101 0.0482 0.0011 280 43 301 7.6 303 6.9 99 7 12.4 149 228 0.65 0.0519 0.0015 0.3106 0.0094 0.0433 0.0005 283 65 275 7.3 274 3.1 99 8 29.5 553 464 1.19 0.0702 0.0012 0.4280 0.0114 0.0440 0.0006 1000 35 362 8.1 277 4.0 73 9 18.5 199 346 0.57 0.0561 0.0015 0.3404 0.0098 0.0441 0.0008 457 62 297 7.4 278 4.7 93 10 16.9 198 312 0.63 0.0524 0.0012 0.3233 0.0095 0.0446 0.0008 302 52 284 7.3 282 4.8 98 11 22.9 273 413 0.66 0.0527 0.0012 0.3202 0.0074 0.0442 0.0007 322 50 282 5.7 279 4.3 98 12 11.8 164 171 0.96 0.0560 0.0028 0.3888 0.0192 0.0505 0.0011 454 108 333 14 318 6.7 95 13 20.4 236 370 0.64 0.0532 0.0010 0.3214 0.0066 0.0438 0.0005 345 44 283 5.1 276 2.8 97 14 16.6 257 283 0.91 0.0501 0.0012 0.3016 0.0066 0.0439 0.0005 211 54 268 5.2 277 3.4 96 15 21.1 286 370 0.77 0.0529 0.0010 0.3232 0.0074 0.0443 0.0006 324 43 284 5.7 279 3.7 98 16 15.7 225 271 0.83 0.0519 0.0016 0.3137 0.0104 0.0439 0.0005 280 70 277 8.0 277 3.0 99 17 8.9 90.2 171 0.53 0.0537 0.0019 0.3211 0.0123 0.0434 0.0007 367 80 283 9.4 274 4.3 96 18 29.4 493 505 0.98 0.0524 0.0011 0.3124 0.0075 0.0434 0.0008 302 46 276 5.8 274 4.7 99 19 27.4 375 484 0.78 0.0561 0.0012 0.3312 0.0097 0.0429 0.0009 454 48 290 7.4 271 5.5 92 20 12.0 115 226 0.51 0.0520 0.0017 0.3085 0.0106 0.0431 0.0006 287 78 273 8.2 272 3.7 99 21 21.4 303 370 0.82 0.0566 0.0011 0.3364 0.0077 0.0432 0.0006 476 43 294 5.9 273 3.6 92 22 31.0 439 533 0.82 0.0524 0.0011 0.3165 0.0072 0.0439 0.0006 302 46 279 5.5 277 3.5 99 23 21.3 248 382 0.65 0.0518 0.0012 0.3114 0.0079 0.0436 0.0005 280 56 275 6.1 275 2.9 99 24 29.3 427 502 0.85 0.0528 0.0012 0.3146 0.0096 0.0431 0.0008 320 50 278 7.4 272 5.0 97 25 22.7 277 404 0.69 0.0561 0.0012 0.3344 0.0085 0.0432 0.0005 457 50 293 6.5 273 3.2 92 26 14.2 172 254 0.68 0.0554 0.0016 0.3260 0.0102 0.0428 0.0005 428 69 286 7.8 270 3.2 94 27 22.3 303 392 0.77 0.0511 0.0014 0.3044 0.0091 0.0434 0.0007 243 60 270 7.1 274 4.3 98 28 24.6 363 403 0.90 0.0600 0.0012 0.3548 0.0069 0.0431 0.0006 606 47 308 5.2 272 3.8 87 29 36.2 478 641 0.75 0.0555 0.0009 0.3247 0.0065 0.0425 0.0006 432 35 286 5.0 268 3.7 93 30 14.3 208 239 0.87 0.0517 0.0015 0.3089 0.0095 0.0434 0.0006 333 67 273 7.4 274 3.6 99 TWD2812-1-1石英闪长岩 1 10.6 118 212 0.55 0.0534 0.0023 0.3033 0.0137 0.0416 0.0010 346 100 269 11 263 6.4 97 2 25.5 400 471 0.85 0.0479 0.0014 0.2777 0.0092 0.0421 0.0007 100 70 249 7.3 266 4.6 93 3 21.7 246 400 0.61 0.0576 0.0017 0.3463 0.0112 0.0438 0.0010 517 69 302 8.4 277 6.1 91 4 15.4 222 301 0.74 0.0530 0.0023 0.3004 0.0135 0.0412 0.0006 328 103 267 11 261 3.8 97 5 13.3 162 257 0.63 0.0520 0.0028 0.3100 0.0174 0.0435 0.0007 287 119 274 13 275 4.0 99 6 13.2 176 245 0.72 0.0532 0.0031 0.3170 0.0176 0.0434 0.0007 345 125 280 14 274 4.5 97 7 10.2 123 198 0.62 0.0524 0.0032 0.3089 0.0184 0.0437 0.0007 302 136 273 14 275 4.3 99 8 18.4 240 349 0.69 0.0522 0.0025 0.3101 0.0157 0.0430 0.0005 295 107 274 12 272 3.2 98 9 11.5 164 217 0.76 0.0542 0.0042 0.3332 0.0283 0.0442 0.0011 376 174 292 22 279 6.5 95 10 11.8 160 228 0.70 0.0499 0.0040 0.2851 0.0240 0.0417 0.0006 191 178 255 19 264 3.9 96 11 14.9 255 265 0.96 0.0447 0.0027 0.2654 0.0154 0.0437 0.0007 error 239 12 276 4.0 85 12 18.5 233 352 0.66 0.0562 0.0024 0.3360 0.0148 0.0435 0.0006 461 96 294 11 275 3.7 93 13 15.8 192 299 0.64 0.0558 0.0025 0.3411 0.0164 0.0441 0.0007 443 98 298 12 278 4.0 93 14 7.6 87.4 144 0.60 0.0513 0.0030 0.3138 0.0172 0.0448 0.0009 254 133 277 13 283 5.9 97 15 16.4 220 300 0.73 0.0527 0.0023 0.3234 0.0153 0.0443 0.0007 317 98 285 12 279 4.6 98 16 14.2 190 264 0.72 0.0545 0.0040 0.3247 0.0244 0.0433 0.0007 391 163 286 19 273 4.2 95 17 10.0 137 187 0.73 0.0555 0.0050 0.3269 0.0286 0.0432 0.0008 432 204 287 22 273 5.0 94 18 21.2 310 389 0.80 0.0582 0.0023 0.3524 0.0138 0.0442 0.0007 539 85 306 10 279 4.5 90 19 21.5 344 393 0.88 0.0555 0.0024 0.3310 0.0145 0.0435 0.0007 432 98 290 11 274 4.5 94 20 13.6 189 248 0.76 0.0540 0.0027 0.3277 0.0167 0.0441 0.0007 369 113 288 13 278 4.2 96 21 16.1 229 297 0.77 0.0541 0.0025 0.3287 0.0151 0.0443 0.0007 376 71 289 12 280 4.6 96 22 31.1 445 564 0.79 0.0518 0.0015 0.3183 0.0110 0.0444 0.0006 276 69 281 8.5 280 3.7 99 23 33.4 425 614 0.69 0.0510 0.0017 0.3157 0.0110 0.0449 0.0007 243 79 279 8.5 283 4.0 98 24 45.1 559 827 0.68 0.0575 0.0023 0.3477 0.0134 0.0442 0.0009 509 89 303 10 279 5.3 91 25 13.0 167 250 0.67 0.0524 0.0037 0.3237 0.0238 0.0447 0.0011 302 127 285 18 282 6.8 99 26 19.1 296 342 0.86 0.0505 0.0021 0.3127 0.0150 0.0447 0.0007 217 103 276 12 282 4.2 98 27 11.5 154 213 0.72 0.0500 0.0024 0.2971 0.0134 0.0434 0.0005 195 111 264 10 274 3.3 96 28 18.7 266 344 0.77 0.0489 0.0018 0.2948 0.0115 0.0437 0.0005 143 87 262 9.0 276 3.3 95 29 18.3 247 341 0.73 0.0502 0.0019 0.3046 0.0114 0.0443 0.0006 211 95 270 8.8 279 3.8 96 30 26.4 570 430 1.33 0.0522 0.0016 0.3199 0.0102 0.0445 0.0006 300 72 282 7.8 281 4.0 99 
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表 2 雅布赖地区埃达克岩主量、微量和稀土元素分析结果
Table 2. Content of major, trace elements, and REE of the Yabulai adakite
样号 PM001-20-1 D5483-1-1 D5865-1-1 D3132-1-1 PM021-10-1 D2812-1-1 D0605-1-1 D7135-1-1 岩性 闪长岩 闪长岩 闪长岩 闪长岩 闪长岩 石英闪长岩 石英闪长岩 石英闪长岩 SiO2 61.23 63.41 61.21 61.63 62.98 61.32 61.12 60.56 TiO2 0.74 0.62 0.68 0.70 0.56 0.71 0.79 0.80 Al2O3 17.33 16.00 16.18 16.38 15.86 16.35 16.02 16.99 Fe2O3 2.31 1.23 1.60 1.86 1.67 1.80 1.94 1.89 FeO 3.37 4.19 4.00 3.92 3.00 3.51 3.79 4.36 MnO 0.10 0.09 0.10 0.12 0.09 0.10 0.11 0.11 MgO 1.45 2.52 2.99 1.65 2.34 1.78 1.95 3.06 CaO 4.26 5.08 6.22 4.65 5.11 5.21 5.43 6.39 Na2O 4.62 3.63 3.50 3.78 3.48 4.02 4.06 2.93 K2O 2.63 2.09 1.98 2.89 2.65 3.40 2.74 1.80 P2O5 0.25 0.19 0.20 0.32 0.20 0.26 0.29 0.21 H2O+ 0.78 0.19 0.6 0.82 0.46 0.74 0.85 0.28 CO2 0.4 0.12 0.27 0.74 0.37 0.51 0.62 0.45 烧失量 1.24 0.36 0.96 1.69 1.49 1.33 1.56 0.78 总计 99.53 99.41 99.62 99.59 99.43 99.79 99.80 99.88 Na2O/K2O 1.76 1.74 1.77 1.31 1.31 1.18 1.48 1.63 Mg# 38 49 53 38 53 43 43 51 A/CNK 0.95 0.91 0.85 0.92 0.89 0.82 0.82 0.93 σ 2.88 1.60 1.65 2.39 1.88 3.01 2.55 1.27 Cs 3.03 2.03 2.52 1.80 2.02 1.31 1.43 3.38 Rb 124 98.2 74.2 98.6 89.9 77.4 73.5 68.2 Sr 758 746 725 697 572 640 581 611 Ba 310 345 423 725 816 457 412 489 Nb 10.2 8.96 6.33 9.55 7.44 8.46 9.14 6.10 Ta 0.85 1.13 0.69 0.58 1.06 0.63 0.62 0.62 Zr 432 122 136 316 123 285 278 178 Hf 9.78 5.41 4.34 6.95 5.96 7.04 6.85 7.20 Th 20.2 9.63 9.23 16.5 13.4 8.12 9.14 6.44 V 48.3 102 113 57.5 90.1 70.7 76.7 127 Cr 6.70 63.6 35.5 14.7 17.0 11.7 9.94 13.8 Co 8.56 21.6 15.2 9.33 11.7 10.5 10.5 17.7 Ni 5.53 34.2 17.2 7.25 12.3 7.19 5.53 9.86 Li 26.4 16.3 16.5 16.2 17.8 9.67 11.1 24.6 U 2.29 1.32 1.81 1.45 1.44 1.24 1.30 1.46 La 92.2 22.8 20.1 64.1 22.8 44.1 44.5 27.6 Ce 165 41.6 38.4 119 44.1 85.5 86.2 51.3 Pr 16.2 4.85 4.67 12.0 5.13 9.24 9.07 6.00 Nd 50.2 19.6 18.9 42.5 19.0 33.1 32.6 24.3 Sm 6.32 3.56 3.72 6.65 3.19 5.30 5.45 4.42 Eu 1.60 1.08 1.21 1.55 0.97 1.46 1.40 1.22 Gd 3.76 2.98 3.23 4.64 2.69 4.10 4.03 3.62 Tb 0.49 0.48 0.47 0.63 0.37 0.58 0.58 0.47 Dy 1.84 2.52 2.62 2.78 2.16 2.68 2.74 2.20 Ho 0.36 0.52 0.47 0.52 0.42 0.50 0.52 0.41 Er 1.12 1.41 1.42 1.32 1.22 1.43 1.48 1.21 Tm 0.16 0.24 0.22 0.18 0.18 0.20 0.21 0.17 Yb 1.06 1.55 1.45 1.23 1.25 1.31 1.43 1.13 Lu 0.18 0.22 0.23 0.18 0.19 0.20 0.21 0.17 Y 12.6 11.4 11.1 14.6 12.0 14.0 14.7 11.8 ∑REE 353.1 114.8 108.2 271.9 115.6 203.7 205.1 136.0 LREE/HREE 37.0 9.42 8.61 21.4 11.2 16.3 16.0 12.2 δEu 0.93 0.99 1.04 0.81 0.99 0.92 0.88 0.91 (La/Yb) N 58.7 9.91 9.34 35.1 12.3 22.7 21.0 16.4 Sr/Y 60.2 65.4 65.3 47.7 47.8 45.7 39.5 51.8 La/Nb 9.04 2.54 3.17 6.71 3.06 5.21 4.87 4.52 Y/Yb 11.9 7.35 7.66 11.9 9.58 10.7 10.3 10.4 Rb/Sr 0.16 0.13 0.10 0.14 0.16 0.12 0.13 0.11 La/Sm 14.6 6.40 5.40 9.64 7.16 8.32 8.17 6.24 La/Yb 87.0 14.7 13.9 52.1 18.2 33.7 31.1 24.3 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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表 3 雅布赖地区埃达克岩中斜长石电子探针分析结果
Table 3. Electron microprobe data of plagioclase from the Yabulai adakite
% 测点 D5822-1-1闪长岩 D7135-1-1石英闪长岩 1 2 3 4 5 6 7 1 2 3 4 5 6 7 8 Na2O 6.42 6.44 6.10 8.48 8.10 5.87 6.05 5.33 5.67 5.40 5.68 1.65 2.55 2.93 6.15 MgO 0.00 0.00 0.00 0.03 0.00 0.00 0.01 0.02 0.00 0.02 0.00 0.02 0.06 0.00 0.00 Al2O3 26.02 25.92 26.17 24.48 24.90 27.45 27.33 27.85 26.59 27.01 26.10 31.39 30.50 29.71 26.13 SiO2 58.84 58.51 58.27 64.32 64.03 57.30 58.22 56.11 56.32 56.30 56.71 47.32 49.36 50.33 58.72 FeO 0.05 0.05 0.04 0.00 0.01 0.09 0.08 0.16 0.18 0.12 0.08 0.16 0.18 0.10 0.05 MnO 0.00 0.01 0.00 0.00 0.00 0.06 0.00 0.04 0.03 0.00 0.00 0.02 0.00 0.00 0.00 TiO2 0.03 0.09 0.05 0.00 0.00 0.00 0.00 0.05 0.00 0.00 0.00 0.03 0.00 0.00 0.00 Cr2O3 0.01 0.06 0.00 0.00 0.00 0.03 0.02 0.00 0.01 0.00 0.03 0.00 0.00 0.03 0.00 K2O 0.08 0.05 0.05 0.02 0.01 0.06 0.09 0.03 0.07 0.03 0.06 0.02 0.04 0.02 0.03 CaO 7.86 8.41 8.76 2.71 2.04 8.19 7.96 10.25 10.63 10.81 10.55 18.49 17.13 15.99 8.75 P2O5 0.01 0.02 0.02 0.02 0.00 0.00 0.01 0.00 0.00 0.00 0.00 0.01 0.00 0.03 0.05 NiO 0.00 0.00 0.02 0.01 0.00 0.01 0.02 0.01 0.00 0.05 0.02 0.00 0.00 0.00 0.00 V2O3 0.00 0.00 0.02 0.00 0.00 0.00 0.00 0.00 0.02 0.02 0.00 0.00 0.00 0.00 0.02 总计 99.32 99.55 99.51 100.06 99.09 99.06 99.78 99.84 99.50 99.76 99.23 99.12 99.83 99.14 99.90 An 40 42 44 15 12 43 42 51 51 52 51 86 79 75 44 Ab 59 58 56 85 88 56 58 48 49 47 49 14 21 25 56 Or 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0
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