Late Triassic zircon U-Pb ages and Sr-Nd-Hf isotopes of Darongshan granites in southeastern Guangxi and their geological implications
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摘要:
对桂东南大容山花岗岩进行了详细的锆石U-Pb定年及Sr-Nd-Hf同位素研究，3个花岗岩样品获得的206Pb/238U年龄加权平均值分别为253.6±2.1Ma、256.4±1.8Ma和256.8±2.8Ma，暗示其形成于晚二叠世，而不是早—中三叠世；岩体的εNd（t）和εHf（t）值均为负值，分别集中于-9.18~-13.4和-5.5~-6.7之间，对应的两阶段Nd模式年龄（tDMc）和Hf模式年龄（TDM2）分别为1.55~1.84Ga和1.64~1.71Ga，表明岩体物质的源区主要为古元古代—中元古代的壳源物质。结合区域已有的研究成果，认为其形成可能与华南板块和印支地块之间在海西期—印支期的俯冲/碰撞拼合有关。
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关键词:
- 锆石U-Pb /
- Sr-Nd-Hf同位素 /
- 花岗岩 /
- 大容山 /
- 桂东南地区
Abstract:The petrogenesis and geodynamic processes of the Darongshan granite have been a subject of much controversy. In this paper, the authors report U-Pb ages and Sr-Nd-Hf isotopes for the Darongshan granite in southeastern Guangxi. LA-ICP-MS U-Pb zircon analysis yielded 206Pb/238U weighted mean age of 253.6±2.1Ma, 256.4±1.8Ma and 256.8±2.8Ma for three granite samples respectively, indicating that these granites are of Late Permian origin rather than the Early-Middle Triassic origin. They have relatively high εNd(t) values (-9.18~-13.4) and younger Nd model ages (tDMc=1.55~1.84Ga), which are consistent with εHf(t) values (-5.5~-6.7) and Hf model ages (TDM2=1.64~1.71Ga), suggesting an lower crustal source mixed with the Paleo-Mesoproterozoic materials. Combined with previous studies, the authors hold that the Darongshan granitic magmatism might have been related to anatexis of the lower crust due to the subduction/collision between Indosinian block and South China plate during the Hercynian to Indosinian period.
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Keywords:
- zircon U-Pb /
- Sr-Nd-Hf isotope /
- granite /
- Darongshan /
- southeastern Guangxi
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致谢: 锆石阴极发光照相和锆石U-Pb同位素测试分别得到中国地质大学地质过程与矿产资源国家重点实验室（GPMR）郑曙高级工程师和胡兆初研究员的帮助，薄片鉴定得到南京大学黄志诚老师的帮助，审稿专家对本文提出了宝贵的修改意见，在此一并表示感谢。
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图 2 大容山花岗岩典型锆石阴极发光(CL)照片（大于1000Ma为207Pb/206Pb年龄；小于1000Ma为206Pb/238U年龄，年龄值下面数据为εHf（t）值）
Figure 2. Representative cathodoluminescence (CL) images of zircons from the Darongshan granite
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图 3 大容山花岗岩锆石U-Pb谐和图
Figure 3. U-Pb concordia diagrams for zircons from the Darongshan granite
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表 1 大容山花岗岩LA-ICP-MS锆石U-Th-Pb同位素分析结果
Table 1 LA-ICP-MS U-Th-Pb isotope analyses of zircons from the Darongshan granites
点号 Pb/10-6 Th/10-6 U/10-6 Th/U 同位素比值 表面年龄/Ma 207Pb/206Pb 1σ 207Pb/235U 1σ 206Pb/238U 1σ 207Pb/206Pb 1σ 207Pb/235U 1σ 206Pb/238U 1σ DRS1001（堇青石花岗岩） 1 19 83 457 0.18 0.049 0.002 0.26 0.01 0.0392 0.0004 129 70 238 8 248 3 2 29 103 672 0.15 0.051 0.003 0.28 0.02 0.0393 0.0004 245 112 249 12 249 2 3 16 74 352 0.21 0.050 0.002 0.28 0.01 0.0399 0.0004 178 67 247 8 252 3 4 21 106 473 0.22 0.049 0.002 0.27 0.01 0.0398 0.0005 154 67 242 8 252 3 5 19 129 415 0.31 0.050 0.002 0.28 0.01 0.0402 0.0004 200 59 248 7 254 2 6 15 68 331 0.20 0.051 0.002 0.28 0.01 0.0402 0.0004 243 53 254 7 254 2 7 15 70 333 0.21 0.052 0.002 0.29 0.01 0.0402 0.0005 300 73 258 9 254 3 8 10 46 228 0.20 0.050 0.003 0.28 0.02 0.0404 0.0006 176 101 248 12 255 4 9 21 52 494 0.11 0.051 0.002 0.28 0.01 0.0406 0.0005 244 62 255 8 256 3 10 20 62 449 0.14 0.052 0.002 0.29 0.01 0.0406 0.0004 272 62 259 8 257 3 11 19 47 420 0.11 0.052 0.002 0.30 0.01 0.0409 0.0005 304 62 263 8 258 3 12 10 51 214 0.24 0.049 0.002 0.28 0.01 0.0409 0.0005 154 89 252 11 259 3 13 15 47 315 0.15 0.060 0.003 0.36 0.02 0.0435 0.0007 398 131 286 14 272 4 14 20 69 336 0.21 0.054 0.002 0.39 0.02 0.0511 0.0008 357 73 332 13 321 5 15 23 61 384 0.16 0.056 0.002 0.41 0.02 0.0527 0.0006 465 59 352 11 331 4 16 39 114 216 0.53 0.068 0.002 1.41 0.05 0.1504 0.0022 857 43 895 19 903 12 17 169 226 1001 0.23 0.069 0.001 1.45 0.04 0.1505 0.0024 904 30 912 16 904 14 DRS1004（角闪黑云钾长花岗岩） 1 24 225 461 0.49 0.065 0.003 0.36 0.01 0.0401 0.0005 241 155 248 14 249 3 2 9 91 207 0.44 0.054 0.003 0.29 0.01 0.0401 0.0005 356 87 260 11 253 3 3 19 191 381 0.50 0.053 0.002 0.30 0.01 0.0402 0.0005 348 71 264 10 254 3 4 13 117 268 0.44 0.049 0.002 0.27 0.01 0.0402 0.0006 142 69 241 9 254 4 5 14 102 285 0.36 0.052 0.002 0.28 0.01 0.0403 0.0005 289 69 255 9 255 3 6 24 281 475 0.59 0.051 0.002 0.28 0.01 0.0404 0.0005 237 65 255 8 255 3 7 9 80 189 0.42 0.051 0.003 0.28 0.02 0.0403 0.0006 259 94 253 12 255 4 8 31 323 634 0.51 0.051 0.002 0.28 0.01 0.0404 0.0004 240 57 254 7 255 2 9 12 123 242 0.51 0.049 0.002 0.28 0.01 0.0406 0.0005 168 81 248 10 256 3 10 22 217 439 0.50 0.052 0.002 0.29 0.01 0.0405 0.0006 292 49 259 7 256 3 11 20 183 401 0.46 0.049 0.002 0.28 0.01 0.0406 0.0005 150 66 247 8 257 3 12 12 81 262 0.31 0.051 0.002 0.29 0.01 0.0410 0.0005 246 91 258 11 259 3 13 18 156 364 0.43 0.059 0.002 0.33 0.01 0.0412 0.0004 552 53 292 8 260 3 14 237 3268 4312 0.76 0.052 0.001 0.30 0.01 0.0412 0.0003 286 22 265 3 260 2 15 13 144 250 0.58 0.056 0.002 0.32 0.01 0.0413 0.0006 453 57 281 9 261 4 16 11 129 207 0.62 0.052 0.003 0.30 0.02 0.0420 0.0006 270 95 265 12 265 4 17 10 86 191 0.45 0.058 0.005 0.34 0.03 0.0434 0.0008 525 154 297 22 274 5 18 12 61 187 0.32 0.056 0.002 0.42 0.02 0.0533 0.0014 459 71 355 16 335 9 DRS1006-1（堇青石黑云母二长花岗岩） 1 72 1285 1324 0.97 0.050 0.002 0.27 0.01 0.0397 0.0007 184 72 245 10 251 4 2 8 142 158 0.90 0.058 0.003 0.31 0.02 0.0399 0.0006 509 101 277 14 252 4 3 7 108 147 0.73 0.050 0.003 0.27 0.02 0.0402 0.0006 208 104 248 12 254 4 4 17 260 322 0.81 0.051 0.002 0.28 0.01 0.0403 0.0004 245 68 253 8 255 2 5 34 557 587 0.95 0.066 0.002 0.37 0.01 0.0408 0.0004 794 61 320 10 258 2 6 29 328 567 0.58 0.058 0.002 0.33 0.01 0.0413 0.0003 377 92 272 9 259 2 7 78 1746 1258 1.39 0.05 0.001 0.31 0.01 0.0413 0.0004 408 37 277 6 261 3 8 248 1907 2772 0.69 0.056 0.002 0.55 0.02 0.0710 0.0014 432 58 445 15 442 8 9 18 140 184 0.76 0.073 0.004 0.73 0.03 0.0731 0.0014 1016 62 557 20 455 8 10 27 176 250 0.70 0.056 0.002 0.66 0.02 0.0853 0.0010 446 55 513 14 527 6 11 189 702 1682 0.42 0.058 0.001 0.77 0.01 0.0962 0.0006 516 28 578 8 592 3 12 271 551 1677 0.33 0.065 0.003 1.24 0.05 0.1366 0.0022 769 55 817 22 826 12 13 82 225 435 0.52 0.070 0.001 1.47 0.02 0.1543 0.0010 901 22 918 9 925 6 14 201 848 933 0.91 0.071 0.003 1.56 0.06 0.1581 0.0025 948 50 954 23 946 14 15 87 281 422 0.67 0.068 0.003 1.52 0.06 0.1607 0.0028 870 55 938 25 960 16 16 300 166 1568 0.11 0.082 0.004 1.95 0.08 0.1702 0.0037 1241 50 1097 29 1013 20 17 213 369 1078 0.34 0.074 0.001 1.77 0.04 0.1725 0.0020 1044 24 1036 14 1026 11 18 87 168 357 0.47 0.078 0.001 2.18 0.03 0.2033 0.0013 1141 19 1175 10 1193 7 19 30 51 117 0.44 0.089 0.002 2.64 0.06 0.2155 0.0024 1275 67 1259 23 1249 13 20 41 75 158 0.47 0.084 0.002 2.47 0.07 0.2142 0.0021 1281 38 1264 20 1251 11 21 60 112 197 0.57 0.092 0.002 3.12 0.05 0.2448 0.0016 1471 22 1437 13 1412 8 22 98 201 304 0.66 0.089 0.001 3.15 0.04 0.2552 0.0015 1413 18 1445 11 1465 8 23 95 134 289 0.46 0.095 0.001 3.47 0.05 0.2642 0.0015 1535 18 1522 11 1511 8 24 204 43 524 0.08 0.122 0.002 5.81 0.10 0.3448 0.0025 1983 21 1948 15 1910 12 25 103 181 151 1.20 0.162 0.003 10.4 0.2 0.4617 0.0036 2479 20 2468 17 2447 16 
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表 2 大容山花岗岩Sr-Nd同位素组成
Table 2 Sr and Nd isotopic compositions of the Darongshan granites
样品号 87Rb/86Sr 87Sr/86Sr
(2σ)147Sm/144Nd 143Nd/144Nd
(2σ)(87Sr/86Sr)i (143Nd/144Nd)i εNd(t) tDMc/Ga DRS1001 11.279 0.76728±5 0.1387 0.511924±4 0.726049 0.511691 -12.03 1.74 DRS1004 12.637 0.76136±4 0.1275 0.512051±4 0.715155 0.511837 -9.18 1.55 DRS1006-1 7.289 0.75759±5 0.1224 0.511826±3 0.730945 0.511620 -13.41 1.84 注：87Rb/86Sr和147Sm/144Nd值据Rb、Sr、Sm、Nd微量元素分析结果和Sr、Nd同位素组成计算；球粒陨石均一储库（CHUR）组成：87Rb/86Sr=0.0827，87Sr/86Sr=0.7045，147Sm/144Nd=0.1967，143Nd/ 144Nd=0.512638；亏损地幔(DM)取值：147Sm/144Nd=0.2137，143Nd/144Nd=0.51315；大陆地壳(CC)取值：147Sm/144Nd=0.118；lRb=1.42×10-11a；lSm=6.54×10-12/a；同位素初始比值为t=255Ma时的比值；(87Sr/86Sr)i和(143Nd/144Nd)分别代表初始Sr和Nd同位素比值
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表 3 大容山花岗岩Hf同位素分析结果
Table 3 Zircon Hf isotopic compositions of the Darongshan granites
点号 年龄 176Hf/177Hf 2σ 176Lu/177Hf 176Yb/177Hf εHf(t) TDM1/Ga TDM2/Ga fLu/Hf 1 257 0.282445 0.000027 0.000892 0.028449 -6.1 1.14 1.67 -0.97 2 255 0.282454 0.000026 0.001938 0.064830 -5.9 1.16 1.66 -0.94 3 254 0.282453 0.000023 0.000840 0.026935 -5.8 1.13 1.65 -0.97 4 257 0.282470 0.000026 0.002750 0.094671 -5.5 1.16 1.63 -0.92 5 257 0.282284 0.000023 0.000086 0.003776 -11.6 1.33 2.02 -1.00 6 260 0.282461 0.000023 0.001206 0.041247 -5.6 1.13 1.64 -0.96 7 257 0.282427 0.000028 0.000645 0.020979 -6.7 1.16 1.71 -0.98 8 257 0.282437 0.000027 0.000884 0.030112 -6.4 1.15 1.69 -0.97 9 257 0.282455 0.000032 0.001695 0.058142 -5.9 1.15 1.66 -0.95 10 257 0.282446 0.000024 0.000802 0.026554 -6.0 1.14 1.67 -0.98
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