The petrogenesis of minette from Luocheng of Northern Guangxi: Geochemistry and U-Pb geochronology
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摘要:
对桂北罗城地区云煌岩开展系统的地球化学研究及LA-ICP-MS锆石U-Pb测年，获得锆石U-Pb年龄为248 ±1 Ma。其富钾（K2O/Na2O=4.23~136.2），富碱（K2O+Na2O=6.86%~8.03%），钾的含量显著高于大陆地壳平均值，富集轻稀土元素及大离子亲石元素，亏损高场强元素，具有较低的La/Nb值，Nb/U值低于洋中脊玄武岩、岛弧玄武岩及上地壳值，与全球平均俯冲沉积物接近，表明源区可能为早期俯冲交代作用形成的富集地幔。结合区域构造背景分析，推测桂北罗城地区云煌岩形成在中生代三叠纪（248±1 Ma）华南陆内岩石圈伸展减薄的背景下，软流圈上涌促使交代富集地幔发生部分熔融形成云煌岩岩浆，区域上NNE向的深大断裂为岩浆喷发提供通道。
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关键词:
- 云煌岩 /
- 地球化学 /
- LA-ICP-MS锆石U-Pb测年 /
- 岩石成因 /
- 桂北罗城
Abstract:In this paper, the authors conducted detailed study of geochemistry and LA-ICP-MS zircon U-Pb geochronology of lamproites in Luocheng of northern Guangxi, and obtained a zircon age of 248±1 Ma, indicating that the lamprophyre magmatic activity in this area occurred during the Triassic.The potassium content of minette is significantly higher than average content of continental crust.The rock is characterized by rich potassium (K2O/Na2O=4.23~136.2) and alkali (K2O+Na2O=6.86%~8.03%) and enrichment of light rare-earth elements and large ion lithophile elements as well as depletion of high field strength elements with low La/Nb ratios, Nb/U ratio less than MORB, OIB and the value of the earth's crust, being close to average relevant values of global diving sediments.These results show that the source area might have been the enriched mantle formed by early subduction metasomatism.Combined with regional tectonic background analysis, the authors infer that the diagenetic process of minette from Luocheng in northern Guangxi was as follows:the intracontinental lithosphere of South China experienced stretching and thinning in Mesozoic Triassic (255.5±3.5 Ma), the upwelling of the asthenosphere caused the partial melting of the enriched mantle to form the minettes magma, and the NNE-trending deep fault in the region provided the channel for the magma eruption.
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Key words:
- minette /
- geochemistry /
- LA-ICP-MS zircon U-Pb dating /
- petrogenesis /
- Luocheng, northern Guangxi
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表 1 桂北罗城地区水牛峒云煌岩D127锆石U-Th-Pb分析结果
Table 1. U-Th-Pb data for zircons from minette D127 of Shuiniudong in Luocheng area, northern Guangxi
测试点 Th/10-6 U/10-6 Th/U 普通铅(207法)校对后同位素比值 普通铅(207法)校对后表生年龄/Ma 207Pb/206Pb 1σ 207Pb/235U 1σ 206Pb/238U 1σ 207Pb/206Pb 1σ 207Pb/235U 1σ 206Pb/238U 1σ D127-1 63 376 0.17 0.0552 0.0108 0.2958 0.0570 0.0388 0.0014 422 347 263 45 246 9 D127-2 118 208 0.57 0.0518 0.0020 0.3029 0.0115 0.0424 0.0004 278 91 269 9 268 2 D127-3 172 524 0.33 0.0514 0.0013 0.2764 0.0065 0.0390 0.0003 258 40 248 5 247 2 D127-4 80 444 0.18 0.0599 0.0035 0.4267 0.0239 0.0517 0.0008 600 95 361 17 325 5 D127-5 95 416 0.23 0.0513 0.0020 0.2745 0.0105 0.0388 0.0004 254 68 246 8 245 3 D127-6 148 188 0.79 0.0698 0.0011 1.4047 0.0194 0.1460 0.0010 923 17 891 8 878 6 D127-7 70 302 0.23 0.0514 0.0026 0.2819 0.0141 0.0398 0.0004 257 98 252 11 252 2 D127-8 72 198 0.37 0.0506 0.0020 0.2789 0.0107 0.0400 0.0004 222 70 250 8 253 2 D127-9 122 279 0.44 0.0509 0.0020 0.2773 0.0106 0.0395 0.0003 238 74 248 8 250 2 D127-10 161 456 0.35 0.0515 0.0018 0.2803 0.0096 0.0395 0.0004 264 60 251 8 250 2 D127-11 70 214 0.33 0.0497 0.0106 0.3113 0.0658 0.0455 0.0017 180 334 275 51 287 11 D127-12 78 336 0.23 0.0514 0.0016 0.2756 0.0079 0.0389 0.0003 259 50 247 6 246 2 D127-13 93 328 0.28 0.0518 0.0012 0.2815 0.0059 0.0394 0.0003 277 35 252 5 249 2 D127-14 72 344 0.21 0.0523 0.0027 0.3407 0.0174 0.0472 0.0006 300 95 298 13 297 3 D127-15 74 166 0.45 0.0506 0.0081 0.2853 0.0454 0.0409 0.0010 220 290 255 36 259 6 D127-16 80 254 0.32 0.0508 0.0016 0.2738 0.0082 0.0391 0.0003 232 53 246 7 247 2 D127-17 239 351 0.68 0.0501 0.0014 0.2719 0.0070 0.0393 0.0003 201 46 244 6 249 2 D127-18 84 239 0.35 0.0495 0.0017 0.2706 0.0088 0.0397 0.0004 169 59 243 7 251 2 D127-19 173 506 0.34 0.0518 0.0010 0.2778 0.0050 0.0389 0.0003 276 28 249 4 246 2 D127-20 85 203 0.42 0.0511 0.0034 0.2762 0.0181 0.0392 0.0005 245 127 248 14 248 3 D127-21 80.3 174 0.46 0.0512 0.0028 0.2831 0.0152 0.0401 0.0005 251 101 253 12 253 3 D127-22 69 891 0.08 0.0651 0.0007 1.1222 0.0096 0.1251 0.0008 776 23 764 5 760 4 D127-23 103 279 0.37 0.0498 0.0025 0.2735 0.0131 0.0398 0.0004 187 93 245 10 252 2 D127-24 397 390 1.02 0.0513 0.0024 0.2733 0.0123 0.0387 0.0004 253 86 245 10 245 2 D127-25 64 374 0.17 0.0503 0.0011 0.2730 0.0054 0.0393 0.0003 211 33 245 4 249 2 D127-26 63 823 0.08 0.0640 0.0023 0.6937 0.0240 0.0786 0.0009 741 78 535 14 488 5 D127-27 98 161 0.57 0.1625 0.0026 9.7355 0.1402 0.4346 0.0043 2482 12 2410 13 2326 20 D127-28 48 541 0.09 0.0523 0.0013 0.2772 0.0065 0.0385 0.0003 298 41 248 5 243 2 D127-29 89 342 0.26 0.0522 0.0013 0.2832 0.0066 0.0394 0.0003 294 39 253 5 249 2 D127-30 144 447 0.32 0.0514 0.0010 0.2748 0.0049 0.0388 0.0003 257 28 247 4 245 2 
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表 2 桂北罗城地区上呇云煌岩D130锆石U-Th-Pb分析结果
Table 2. U-Th-Pb data for zircons from minette D130 ofShuiqi in Luocheng area, northern Guangxi
测试点 Th
/10-6U
/10-6Th/U 普通铅(207法)校对后同位素比值 普通铅(207法)校对后表生年龄/Ma 207Pb/206Pb 1σ 207Pb/235U 1σ 206Pb/238U 1σ 207Pb/206Pb 1σ 207Pb/235U 1σ 206Pb/238U 1σ D130-01 92 347 0.26 0.0506 0.0015 0.2734 0.0074 0.0392 0.0003 221 49 245 6 248 2 D130-02 135 265 0.51 0.0509 0.0027 0.2749 0.0141 0.0392 0.0004 238 98 247 11 248 3 D130-03 92 481 0.19 0.0683 0.0009 1.2631 0.0118 0.1343 0.0008 876 10 829 5 812 5 D130-04 131 398 0.33 0.0519 0.0016 0.2800 0.0083 0.0392 0.0004 281 51 251 7 248 2 D130-05 79 335 0.24 0.0521 0.0013 0.2815 0.0065 0.0392 0.0003 291 39 252 5 248 2 D130-06 80 367 0.22 0.0580 0.0055 0.4343 0.0404 0.0543 0.0012 531 166 366 29 341 8 D130-07 74 267 0.28 0.0510 0.0025 0.2777 0.0133 0.0395 0.0004 240 91 249 11 250 3 D130-08 123 387 0.32 0.0513 0.0019 0.2777 0.0096 0.0393 0.0004 255 61 249 8 248 2 D130-09 84 294 0.29 0.0583 0.0024 0.3120 0.0123 0.0389 0.0003 539 74 276 10 246 2 D130-10 76 428 0.18 0.0503 0.0124 0.4311 0.1055 0.0621 0.0025 211 385 364 75 389 15 D130-11 66 265 0.25 0.0539 0.0059 0.4851 0.0528 0.0653 0.0011 367 216 402 36 408 7 D130-12 338 373 0.91 0.0530 0.0021 0.4414 0.0170 0.0605 0.0007 327 68 371 12 378 4 D130-13 74 447 0.17 0.0513 0.0014 0.2757 0.0073 0.0390 0.0003 252 46 247 6 247 2 D130-14 139 253 0.55 0.0512 0.0047 0.2774 0.0250 0.0393 0.0006 249 177 249 20 249 4 D130-15 314 312 1.01 0.0512 0.0041 0.2780 0.0216 0.0394 0.0007 252 145 249 17 249 4 D130-16 80 429 0.19 0.0516 0.0011 0.2781 0.0056 0.0391 0.0003 268 33 249 4 247 2 D130-17 95 394 0.24 0.0513 0.0011 0.2782 0.0054 0.0394 0.0003 253 31 249 4 249 2 D130-18 107 569 0.19 0.0514 0.0015 0.2788 0.0076 0.0393 0.0003 259 47 250 6 249 2 D130-19 54 473 0.11 0.0516 0.0011 0.2781 0.0053 0.0391 0.0003 270 30 249 4 247 2 D130-20 89 250 0.36 0.0508 0.0013 0.2769 0.0065 0.0395 0.0003 234 40 248 5 250 2 D130-21 55 435 0.13 0.0509 0.0026 0.2743 0.0135 0.0391 0.0005 238 91 246 11 247 3 D130-22 57 181 0.31 0.0526 0.0096 0.2825 0.0507 0.0390 0.0014 312 319 253 40 246 8 D130-23 75 410 0.18 0.0514 0.0012 0.2770 0.0061 0.0391 0.0003 258 36 248 5 247 2 D130-24 38 160 0.23 0.0519 0.0070 0.2795 0.0372 0.0391 0.0008 281 257 250 29 247 5 D130-25 60 506 0.12 0.0511 0.0016 0.2787 0.0085 0.0396 0.0003 247 57 250 7 250 2 D130-26 78 300 0.26 0.0513 0.0013 0.2774 0.0064 0.0392 0.0003 254 39 249 5 248 2 D130-27 53 250 0.21 0.0525 0.0024 0.2825 0.0125 0.0391 0.0004 306 81 253 10 247 3 D130-28 70 193 0.36 0.0509 0.0024 0.2755 0.0126 0.0393 0.0005 236 85 247 10 248 3 D130-29 111 568 0.19 0.0514 0.0066 0.2774 0.0351 0.0391 0.0011 260 235 249 28 248 7 D130-30 81 392 0.21 0.0527 0.0066 0.3331 0.0409 0.0459 0.0011 314 231 292 31 289 7
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表 3 桂北罗城地区云煌斑岩主量元素含量测试结果
Table 3. Analyses of major elements of lamproite from Luocheng area, northern Guangxi
% 样号 SiO2 Al2O3 CaO Fe2O3 FeO K2O MgO MnO Na2O P2O5 TiO2 CO2 H2O+ 烧失量 总计 H163-1 46.44 11.47 13.65 1.64 1.98 6.1 4.06 0.06 1.24 1.06 1.17 8.68 2.22 11.12 110.89 H163-2 45.5 11.14 13.44 2 2.05 6.35 3.97 0.07 1.36 1.24 1.16 9.51 1.54 10.98 110.31 H163-3 47.2 11.57 12.83 1.53 1.9 6.48 4.07 0.07 1.53 0.78 1.18 8.81 2.26 10.53 110.74 H126-1 44.98 9.87 10.6 3.11 3.63 6.59 7.2 0.11 1.44 1.42 1.34 7.41 1.9 8.54 108.14 H126-2 47.63 10.25 9.19 3.1 3.02 6.33 7.79 0.1 1.46 1.44 1.29 5.81 2.24 7.37 107.02 H126-3 47.45 10.18 8.94 3.24 2.96 6.28 7.65 0.1 1.47 1.95 1.28 5.59 2.37 7.28 106.74
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表 4 桂北罗城地区云煌岩微量元素含量测试结果
Table 4. Analyses of trace elements of minette from Luocheng area, northern Guangxi
10-6 样号 Li Be Cr Mn Co Ni Cu Zn Ga Rb Sr Mo Cd In Cs Sc Ba Tl Pb Bi Th U Nb Ta Zr Hf Sn Sb Ti W As V La Ce Pr Nd Sm Eu Gd Tb Dy Ho Er Tm Yb Lu Y H163-1 27.7 3.25 592 506 25.7 210 56.1 128 16.2 392 611 0.6 0.11 0.06 7.27 16.2 4368 2.46 33.4 1.41 59.2 9.64 59.1 2.68 444 12.5 6.68 0.99 6436 5.71 2.81 127 81.6 138 16 60.7 12.9 2.58 9.78 1.22 5.97 0.92 2.5 0.28 1.88 0.26 28.9 H163-2 26.2 3.62 707 591 51 267 66.3 223 17.8 400 613 0.59 0.08 < 0.05 7.24 18 3891 2.37 39.4 1.3 58.6 7.93 61.1 2.66 456 12.5 6.69 0.98 7387 5.48 2.44 147 80.6 144 16.5 65 14 3.03 10.2 1.26 6.49 0.94 2.59 0.29 1.9 0.26 31.3 H163-3 29.3 4.58 605 525 39 193 54.7 67.1 15.6 387 629 0.83 0.1 0.06 7.54 18.3 5259 2.57 60 1.31 61.7 17.4 59 2.62 459 11.9 6.65 0.9 7170 4.55 3.21 131 82.7 151 16.9 64.6 14.6 2.52 9 1.16 5.93 0.87 2.42 0.29 1.91 0.26 29 H126-1 33.7 9.89 742 914 41.7 274 61.2 80.6 14.4 412 837 1.03 0.06 0.06 23.2 19.8 4820 3.2 95.3 0.92 87.7 12.6 63.3 2.73 714 17.7 8.08 0.77 8596 3.14 1.94 144 100 203 23.3 90.8 19.4 3.72 13.2 1.63 8.07 1.11 3.07 0.33 2.05 0.28 33.5 H126-2 33.5 8.67 711 830 43.5 275 65.1 86.7 17.6 460 855 2.19 0.1 0.08 15.9 17.4 4127 3.93 94.8 1.01 82.4 11.7 64.5 2.76 749 17.8 7.73 0.85 7726 3.7 1.9 129 82.6 170 19.7 82 16.9 3.41 13.1 1.69 8.48 1.23 3.37 0.39 2.35 0.34 36.7 H126-3 40.3 11.6 843 1028 48.8 313 84.2 113 20.2 505 980 3.49 0.08 0.07 17.9 22 4646 3.97 99.7 1.12 84.2 12.5 66.9 2.75 812 18 8.78 1.08 9435 3.14 2.8 160 96.9 206 23.8 92.6 20.5 3.91 15.1 1.91 9.07 1.29 3.62 0.41 2.39 0.34 40
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