Activation of the Central Kunlun Suture Zone, East Kunlun: Evidence from Carboniferous granites
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摘要:
在东昆仑西段工作程度较低的阿克苏河地区，首次识别出石炭纪侵入岩浆活动。阿克苏复式岩体位于昆中断裂带西段，锆石LA-ICP-MS定年显示，花岗闪长斑岩结晶年龄为361±2.4 Ma，二长花岗岩结晶年龄为357.5±2.8 Ma，花岗闪长岩结晶年龄为354±4.3 Ma，代表这些岩体侵位于晚泥盆世—早石炭世（临近昆中缝合带西部），该阶段岩浆事件此前未见公开报道。主量元素分析显示，此套花岗闪长斑岩、二长花岗岩和花岗闪长岩具有富Si、Al、K的特征，为高钾钙碱性过铝质系列；微量和稀土元素分析显示，岩石具有轻、重稀土元素分馏和轻稀土元素富集及负Eu异常特征，富集大离子亲石元素（LILE）Th、U、Rb、K；亏损高场强元素（HFSE）Nb、P、Ti等。锶同位素分析显示，87Sr/86Sr初始值为0.70612~0.71009，εNd（t）为-7.1~-5.1，TDM2为1.51~1.69 Ga。综合岩石-矿物特征和地球化学分析，这些岩石应该属于I型花岗岩，主要为受幔源岩浆作用后地壳物质重熔的结果，指示东昆仑昆中缝合带在石炭纪处于拉张裂解的状态。结合区域岩相学和岩石学资料，推断这一裂解事件应该为古特提斯洋俯冲引起的弧后盆地初始扩张，并将前人认为的古特提斯洋俯冲开启时间为二叠纪提前到石炭纪。
Abstract:In this publication, we identified Carboniferous intrusions for the first time in the Aksu River area, which has been relatively poorly explored in the western part of the East Kunlun.The Aksu acidic complex is located in the west section of the Central Kunlun fault zone.Zircon LA-ICP-MS dating results reveal that the granodiorite porphyry was crystallized at 361 ± 2.4 Ma, the monzogranite at 357.5 ± 2.8 Ma, and the granodiorite at 354 ± 4.3 Ma, indicating that these rocks were intruded during Late Devonian to Early Carboniferous(close to the west of Central Kunlun Suture Zone) and this stage of the magmatic event has not previously been publicly reported.Analysis of major elements classifies these rocks as belonging to the high potassium calc-alkaline to calc-alkaline and peraluminous series.Trace and rare earth elements indicate that all rocks are enriched in large ion lithophile elements(such as Th, U, Rb, K), light rare earth elements and depleted in high field strength elements(such as Nb, P, Ti).These granites have high initial 87Sr/86Sr(0.70612~0.71009), low whole-rock εNd(t) values(-7.1~-5.1) and relative ancient TDM2 model ages ranging from 1.51 Ga to 1.69 Ga, which is comparable to the composition of enriched mantle or crust in the East Kunlun Orogen.Mineralogical and geochemical analyses indicate that the rocks are I-type granites, formed by remelting of crustal material, suggesting that the Central Kunlun Suture Zone underwent extensional setting during the Carboniferous.Combined with the regional geology and available geochronological data, we propose that this extensional event should be the result of the initial expansion of a back-arc basin caused by subduction of the Paleo-Tethys Ocean, which also places the time of initial subduction of the Paleo-Tethys Ocean in the Carboniferous rather than the Permian.
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Key words:
- granite /
- crustal remelting /
- fracture reactivation /
- Aksu River /
- East Kunlun /
- Early Carboniferous /
- geological survey engineering
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图 1 东昆仑造山带区域地质简图及岩浆岩带划分示意图(据Dong et al., 2018修改，年龄数据据Dong et al., 2018)
Figure 1.
图 3 东昆仑阿克苏河侵入体锆石阴极发光(CL)图像及锆石U-Pb年龄值(白色圆圈代表测点位置，圈中数字为分析点号，编号同表 1，锆石下方年龄为206Pb/238U表面年龄)
Figure 3.
图 6 阿克苏河侵入体球粒陨石标准化稀土元素配分图(a)和原始地幔标准化微量元素蛛网图(b) (球粒陨石和原始地幔数据据Sun et al., 1989)
Figure 6.
图 8 东昆仑区域岩浆岩年龄分布直方图及主要地质事件(据Dong et al., 2018修改)
Figure 8.
图 12 阿克苏河侵入体构造环境判别图(底图据Pearce et al., 1984)
Figure 12.
表 1 阿克苏河侵入体锆石LA-ICP-MS U-Th-Pb同位素测试结果
Table 1. Zircon LA-ICP-MS U-Th-Pb dating results of Aksu River intrusion
点号 同位素比值 年龄/Ma 232Th/238U 207Pb/206Pb σ 207Pb/235U σ 206Pb/238U σ Rho 207Pb/206Pb σ 207Pb/235U σ 206Pb/238U σ 花岗闪长斑岩(37°22′23″N、86°21′35″E) PM2-10-TW1-1 0.29 0.051 0.0019 0.4004 0.0143 0.0574 0.0008 0.39 239 87 342 10.4 359 5.1 PM2-10-TW1-2 0.33 0.053 0.0021 0.4145 0.0161 0.0571 0.0011 0.5 328 88.9 352 11.6 358 6.5 PM2-10-TW1-3 0.14 0.0568 0.0016 0.5771 0.015 0.0738 0.001 0.52 487 56.5 463 9.6 459 5.7 PM2-10-TW1-4 1.08 0.1246 0.0026 6.2138 0.1358 0.3612 0.0047 0.6 2033 37 2006 19.2 1988 22.3 PM2-10-TW1-5 0.71 0.0543 0.0021 0.4319 0.0165 0.0581 0.0009 0.41 389 85.2 364 11.7 364 5.7 PM2-10-TW1-6 0.54 0.0535 0.0021 0.4182 0.0155 0.0571 0.0008 0.38 350 90.7 355 11.1 358 5.1 PM2-10-TW1-7 0.27 0.0568 0.0018 0.4519 0.0148 0.0578 0.0008 0.42 483 72.2 379 10.3 362 5.1 PM2-10-TW1-8 1.10 0.0615 0.0019 0.9172 0.0296 0.1076 0.0014 0.4 657 66.7 661 15.7 659 8.1 PM2-10-TW1-9 0.06 0.0511 0.0019 0.4035 0.0148 0.0579 0.0011 0.52 256 83.3 344 10.7 363 6.6 PM2-10-TW1-10 0.45 0.0555 0.0021 0.4371 0.016 0.0574 0.0009 0.43 435 86.1 368 11.3 360 5.4 PM2-10-TW1-11 0.43 0.0545 0.0027 0.4174 0.0198 0.0564 0.0011 0.41 394 113 354 14.2 354 6.9 PM2-10-TW1-12 0.39 0.0543 0.0019 0.4355 0.0154 0.0581 0.0009 0.44 383 77.8 367 10.9 364 5.7 PM2-10-TW1-13 0.28 0.0513 0.0025 0.4034 0.0189 0.0575 0.001 0.37 254 80.5 344 13.7 360 6.2 PM2-10-TW1-14 0.14 0.0528 0.0017 0.423 0.0135 0.0578 0.0009 0.49 317 74.1 358 9.6 362 5.2 PM2-10-TW1-15 0.26 0.0501 0.0019 0.3999 0.0141 0.0579 0.0012 0.59 198 90.7 342 10.2 363 7.3 PM2-10-TW1-16 0.30 0.0527 0.0023 0.4222 0.0183 0.0581 0.0011 0.44 322 98.1 358 13 364 6.9 PM2-10-TW1-17 0.42 0.0576 0.0036 0.4618 0.0275 0.0579 0.0012 0.35 522 141.6 386 19.1 363 7.5 PM2-10-TW1-18 0.33 0.0551 0.0023 0.4391 0.0173 0.0576 0.0009 0.4 417 92.6 370 12.2 361 5.7 PM2-10-TW1-19 0.19 0.0527 0.002 0.4207 0.0143 0.0582 0.0009 0.45 317 85.2 357 10.2 365 5.3 PM2-10-TW1-20 0.38 0.0559 0.0022 0.4492 0.0166 0.058 0.0012 0.56 456 116.7 377 11.6 364 7.1 PM2-10-TW1-21 0.15 0.1629 0.0043 7.4011 0.3113 0.3163 0.0095 0.71 2487 44.4 2161 37.7 1771 46.6 PM2-10-TW1-22 0.35 0.0547 0.0036 0.4281 0.0249 0.058 0.0015 0.44 398 141.7 362 17.7 363 9.1 PM2-10-TW1-23 0.37 0.0522 0.0021 0.416 0.0162 0.0577 0.0009 0.4 300 94.4 353 11.6 361 5.3 PM2-10-TW1-24 0.52 0.0528 0.0022 0.4216 0.0169 0.0584 0.001 0.43 317 94.4 357 12.1 366 6.4 PM2-10-TW1-25 0.36 0.0549 0.0034 0.4328 0.0211 0.0579 0.0011 0.39 409 138.9 365 15 363 6.8 PM2-10-TW1-26 0.25 0.0558 0.0022 0.4513 0.0185 0.0584 0.0011 0.46 456 88.9 378 13 366 6.7 PM2-10-TW1-27 0.27 0.0511 0.0017 0.4089 0.0132 0.0579 0.0008 0.43 256 77.8 348 9.5 363 5 PM2-10-TW1-28 0.56 0.0565 0.0021 0.4527 0.0168 0.058 0.0009 0.42 478 83.3 379 11.8 363 5.6 PM2-10-TW1-29 0.13 0.0534 0.0022 0.426 0.0168 0.0578 0.001 0.44 346 92.6 360 12 363 5.9 PM2-10-TW1-30 0.48 0.0568 0.0038 0.4374 0.0249 0.0574 0.0012 0.37 483 150.9 368 17.6 360 7.5 花岗闪长岩(37°22′46″N、86°22′23″E) PM2-16-TW1-1 0.90 0.1248 0.0028 6.3756 0.1611 0.3695 0.0056 0.6 2028 38.9 2029 22.2 2027 26.4 PM2-16-TW1-2 0.66 0.0664 0.0014 1.1776 0.0258 0.1286 0.0016 0.57 820 42.6 790 12 780 9.2 PM2-16-TW1-3 0.73 0.1158 0.0021 5.5322 0.1092 0.3453 0.0039 0.57 1894 33.3 1906 17 1912 18.7 PM2-16-TW1-4 0.59 0.0692 0.0016 1.3537 0.0348 0.1416 0.0023 0.63 906 46.3 869 15 854 13.2 PM2-16-TW1-5 1.21 0.0612 0.0024 0.9235 0.0364 0.11 0.0018 0.42 656 83.3 664 19.2 673 10.7 PM2-16-TW1-6 0.40 0.057 0.0023 0.4395 0.0173 0.0563 0.0009 0.41 500 88.9 370 12.2 353 5.5 PM2-16-TW1-7 0.61 0.0553 0.0014 0.4356 0.0121 0.0568 0.0008 0.51 433 57.4 367 8.5 356 5 PM2-16-TW1-8 0.52 0.0624 0.0031 0.9189 0.0433 0.1072 0.0022 0.44 687 107.4 662 22.9 657 12.9 PM2-16-TW1-9 0.09 0.0602 0.0015 0.8803 0.0234 0.1057 0.0016 0.57 609 55.5 641 12.6 647 9.4 PM2-16-TW1-10 1.09 0.1116 0.0027 4.3053 0.1064 0.2777 0.0039 0.57 1826 42.4 1694 20.4 1580 19.9 PM2-16-TW1-11 0.37 0.0545 0.002 0.4204 0.0153 0.0559 0.0009 0.44 394 85.2 356 11 351 5.6 PM2-16-TW1-12 0.72 0.0647 0.0033 0.9418 0.0345 0.1049 0.002 0.52 765 112 674 18.1 643 11.4 PM2-16-TW1-13 0.45 0.0698 0.0034 1.5918 0.0782 0.1657 0.0039 0.48 921 101.1 967 30.6 988 21.4 PM2-16-TW1-14 0.35 0.0961 0.0025 2.2282 0.0615 0.1657 0.0025 0.55 1550 48.3 1190 19.4 989 13.9 PM2-16-TW1-15 0.34 0.0732 0.002 1.8365 0.0488 0.1794 0.0026 0.55 1020 53.7 1059 17.5 1064 14.2 PM2-16-TW1-16 0.53 0.0728 0.0024 1.6725 0.0554 0.1651 0.0027 0.49 1009 68.5 998 21.1 985 14.7 PM2-16-TW1-17 0.78 0.1258 0.0026 6.7305 0.1392 0.3819 0.0048 0.61 2040 37 2077 18.3 2085 22.3 PM2-16-TW1-18 0.44 0.0516 0.0017 0.4069 0.0139 0.0562 0.0009 0.47 333 74.1 347 10 353 5.6 PM2-16-TW1-19 0.21 0.052 0.0014 0.4115 0.0118 0.0564 0.0008 0.49 283 61.1 350 8.5 354 5 PM2-16-TW1-20 0.53 0.058 0.0016 0.8603 0.0274 0.1054 0.0021 0.63 532 59.3 630 15 646 12.2 PM2-16-TW1-21 0.53 0.0555 0.0018 0.4386 0.0136 0.0566 0.0009 0.51 432 65.7 369 9.6 355 5.7 二长花岗岩(37°22′23″N、86°21′28″E) PM2-7-TW1-1 0.56 0.0537 0.002 0.4118 0.0147 0.0551 0.0009 0.46 367 85.2 350 10.6 346 5.3 PM2-7-TW1-2 0.40 0.0621 0.0028 0.4563 0.0225 0.0524 0.0013 0.5 680 91.7 382 15.7 329 7.7 PM2-7-TW1-3 0.47 0.0531 0.0024 0.4257 0.019 0.0579 0.0009 0.35 345 103.7 360 13.5 363 5.5 PM2-7-TW1-4 0.41 0.0562 0.0034 0.4465 0.025 0.058 0.0013 0.4 457 133.3 375 17.6 363 7.7 PM2-7-TW1-5 0.40 0.0546 0.0017 0.4191 0.0143 0.0549 0.001 0.53 394 66.7 355 10.2 344 6.2 PM2-7-TW1-6 0.43 0.0542 0.0021 0.4297 0.017 0.057 0.0009 0.4 389 82.4 363 12.1 357 5.8 PM2-7-TW1-7 0.44 0.059 0.0024 0.4451 0.0164 0.0548 0.0009 0.45 565 87 374 11.5 344 5.4 PM2-7-TW1-8 0.34 0.0557 0.0019 0.4503 0.0153 0.0585 0.0009 0.45 439 78.7 378 10.7 366 5.7 PM2-7-TW1-9 0.75 0.0675 0.003 1.2458 0.0585 0.1323 0.0023 0.37 854 89.8 822 26.5 801 13.1 PM2-7-TW1-10 0.43 0.0536 0.0016 0.4282 0.0135 0.0577 0.0009 0.49 354 68.5 362 9.6 361 5.7 PM2-7-TW1-11 0.34 0.0597 0.0025 0.4368 0.0189 0.053 0.0008 0.35 591 90.7 368 13.4 333 5.1 PM2-7-TW1-12 0.43 0.0537 0.0017 0.4253 0.0137 0.0572 0.0008 0.43 361 72.2 360 9.7 358 5.1 PM2-7-TW1-13 0.33 0.0584 0.0043 0.4614 0.0316 0.0579 0.001 0.25 546 161.1 385 21.9 363 5.9 PM2-7-TW1-14 0.40 0.0611 0.0022 0.8435 0.0312 0.0997 0.0018 0.49 643 75.9 621 17.2 613 10.6 PM2-7-TW1-15 0.41 0.0519 0.002 0.4359 0.0163 0.0614 0.001 0.44 280 88.9 367 11.5 384 6.1 PM2-7-TW1-16 0.59 0.1181 0.0023 4.2078 0.0949 0.255 0.0034 0.59 1928 36.3 1676 18.5 1464 17.3 PM2-7-TW1-17 0.46 0.0521 0.0018 0.4092 0.0137 0.0569 0.0008 0.42 300 79.6 348 9.9 357 5 PM2-7-TW1-18 0.06 0.0586 0.0018 0.5142 0.0156 0.0632 0.0011 0.57 550 66.7 421 10.5 395 6.6 PM2-7-TW1-19 0.11 0.0512 0.0013 0.3848 0.0094 0.0539 0.0007 0.53 250 59.3 331 6.9 338 4.1 PM2-7-TW1-20 0.28 0.0522 0.0021 0.4144 0.0156 0.0581 0.001 0.46 300 92.6 352 11.2 364 6.2 PM2-7-TW1-21 0.30 0.0493 0.0023 0.4873 0.0245 0.0711 0.0015 0.42 161 138.9 403 16.7 443 9 PM2-7-TW1-22 0.59 0.0556 0.0024 0.432 0.018 0.0563 0.001 0.43 439 93.5 365 12.8 353 6.4 PM2-7-TW1-23 0.53 0.0513 0.0031 0.4063 0.0205 0.0575 0.001 0.34 254 138.9 346 14.8 361 6.2 PM2-7-TW1-24 0.44 0.0516 0.0019 0.4064 0.0144 0.0571 0.0009 0.44 333 82.4 346 10.4 358 5.6 PM2-7-TW1-25 0.52 0.0495 0.0017 0.3729 0.0127 0.0541 0.0008 0.43 172 75 322 9.4 340 5 PM2-7-TW1-26 0.43 0.0602 0.0039 0.4861 0.0279 0.0574 0.001 0.3 613 140.7 402 19.1 360 5.9 PM2-7-TW1-27 0.59 0.0521 0.003 0.4248 0.0263 0.0583 0.0014 0.39 300 131.5 359 18.8 365 8.3 PM2-7-TW1-28 0.19 0.0718 0.0025 0.5879 0.0202 0.0588 0.001 0.49 989 72.2 470 12.9 369 6.3 注：Rho代表误差相关系数，Rho=(σ6/38/206Pb/238U)/(σ7/35/207Pb/235U) 
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表 2 阿克苏河侵入体主量、微量及稀土元素分析结果
Table 2. Major, trace and rare earth element compositions of the Aksu River intrusion
元素 PM2-10-TW1 PM2-10-YQ1 PM2-16-TW1 PM2-16-YQ2 PM2-16-YQ3 PM2-7-TW1 PM2-9-YQ1 花岗闪长斑岩 花岗闪长岩 二长花岗岩 SiO2 71.44 71.33 72.54 72.35 69.2 77.53 76.23 TiO2 0.32 0.31 0.27 0.25 0.44 0.04 0.04 Al2O3 13.97 13.59 14.24 13.8 14.78 12.37 12.66 Fe2O3 0.75 0.67 0.47 0.45 0.84 0.18 0.24 FeO 2.1 2.28 1.92 1.6 2.78 0.56 0.63 MnO 0.07 0.08 0.06 0.04 0.07 0.02 0.03 MgO 0.83 0.81 0.73 0.71 1.19 0.17 0.18 CaO 1.16 0.87 2.28 2.57 2.77 0.5 0.89 K2O 3.54 3.38 2.54 2.83 2.03 3.72 4.17 Na2O 4.33 4.17 3.41 3.48 3.23 3.45 3.56 P2O5 0.08 0.08 0.08 0.08 0.12 0.03 0.02 烧失量 1.58 1.48 0.87 1.15 1.56 0.89 1.21 Mg# 35 34 36 39 38 30 28 A/CNK 1.07 1.12 1.14 1.02 1.18 1.16 1.05 A/NK 1.28 1.30 1.71 1.58 1.98 1.28 1.23 Rb 101 90.8 69.3 80.6 74.5 182 201 Ba 1035 1146 806 898 413 197 203 Th 9.73 9.88 9.84 9.55 8.75 11.7 10 U 2.21 2.2 1.33 1.85 1.41 3.74 3.85 K 119.23 115.03 85.59 95.73 69.17 125.32 140.36 Ta 0.7 0.67 1.03 0.9 1.11 1.63 1.49 Nb 9.26 9.17 11.1 6.47 12.7 10.7 11 La 31.3 31.3 32.3 32.8 32.7 16.3 13.1 Ce 64.1 62 64 66.5 67.9 37 29.3 Sr 153 165 214 208 311 34.5 37.2 Nd 26.9 25.7 28.6 26.4 27.4 17.9 14.6 P 3.73 3.77 3.73 3.74 5.66 1.4 0.93 Zr 136 124 114 117 141 53.7 49.4 Hf 4.42 4.23 3.65 4.07 4.4 2.8 2.67 Sm 5.39 5.29 5.22 5.4 5.56 5.41 4.14 Ti 1.5 1.47 1.26 1.17 2.08 0.19 0.19 Y 23.7 23.3 14.8 15.4 18.9 44.2 40.7 Yb 2.48 2.41 1.67 1.65 1.71 4.86 4.44 Lu 0.39 0.37 0.26 0.26 0.26 0.7 0.66 La 31.3 31.3 32.3 32.8 32.7 16.3 13.1 Ce 64.1 62 64 66.5 67.9 37 29.3 Pr 7.59 7.26 7.77 7.78 7.84 4.98 3.88 Nd 26.9 25.7 28.6 26.4 27.4 17.9 14.6 Sm 5.39 5.29 5.22 5.4 5.56 5.41 4.14 Eu 1.03 0.89 1.08 1.08 1.31 0.14 0.12 Gd 4.77 4.78 4.26 4.4 4.9 5.91 4.77 Tb 0.75 0.76 0.61 0.62 0.7 1.2 0.99 Dy 4.36 4.3 3.18 3.14 3.69 7.81 6.62 Ho 0.86 0.85 0.57 0.56 0.65 1.54 1.34 Er 2.54 2.57 1.66 1.64 1.89 4.73 4.21 Tm 0.37 0.38 0.25 0.24 0.26 0.74 0.66 Yb 2.48 2.41 1.67 1.65 1.71 4.86 4.44 Lu 0.39 0.37 0.26 0.26 0.26 0.7 0.66 Y 23.7 23.3 14.8 15.4 18.9 44.2 40.7 ΣREE 152.83 148.86 151.43 152.47 156.77 109.22 88.83 δEu 0.61 0.53 0.68 0.66 0.75 0.08 0.08 TZr/℃ 793 789 789 783 809 728 713 注：主量元素含量单位为%，微量和稀土元素含量单位为10-6; A/CNK=molar[Al2O3/(CaO +Na2O+K2O)]; A/NK=molar [Al2O3/(Na2O+K2O)]; δEu = EuN/(SmN*GdN)1/2; TTi-in-zircon(℃)=(4800±86)/((5.711±0.072)-logαSiO2+logαTiO2-log(Ti-in-zircon))
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表 3 阿克苏河侵入体标准矿物计算结果
Table 3. Mineral composition of Aksu River intrusion
样品号 PM2-10-TW1 PM2-10-YQ1 PM2-16-TW1 PM2-16-YQ2 PM2-16-YQ3 PM2-7-TW1 PM2-9-YQ1 石英(Q) 28.35 30.80 37.09 34.84 35.24 42.16 37.31 斜长石(P) 43.40 41.09 40.99 42.90 42.66 32.23 34.99 钙长石(An) 5.18 3.81 10.74 12.13 13.24 2.23 4.16 钠长石(Ab) 38.22 37.29 30.25 30.77 29.42 30.00 30.83 正长石(Or) 22.33 21.60 16.11 17.89 13.21 23.12 25.81 刚玉(C) 0.75 1.17 1.33 0.37 1.79 1.24 0.48 紫苏辉石(Hy) 4.38 4.54 3.78 3.37 5.99 1.08 1.23 钛铁矿(Il) 0.35 0.34 0.30 0.27 0.50 0.04 0.04 磁铁矿(Mt) 0.28 0.30 0.24 0.20 0.37 0.07 0.08 磷灰石(Ap) 0.16 0.16 0.16 0.16 0.25 0.06 0.04 合计 100 100 100 100 100 100 100 分异指数(DI) 94.07 93.50 94.19 95.63 91.11 97.51 98.12 密度/(g·cc-1) 2.69 2.70 2.71 2.69 2.75 2.65 2.65 液相密度 2.40 2.40 2.41 2.41 2.44 2.35 2.36 干粘度 0.92 0.95 1.02 1.02 0.90 1.29 1.19 湿粘度 0.69 0.70 0.75 0.74 0.69 0.83 0.80 液相线温度 801.26 789.57 780.42 778.71 827.88 688.14 713.40 A/CNK 1.09 1.14 1.16 1.04 1.21 1.17 1.06
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表 4 阿克苏河侵入体Sr-Nd同位素分析结果
Table 4. Sr-Nd isotopic data of Aksu River intrusion
样品号 87Rb/86Sr 87Sr/86Sr 2σ (87Sr/86Sr)i 147Sm/144Nd 143Nd/144Nd 2σ (143Nd/144Nd)i εNd(0) εNd(t) TDM2/Ma PM2-7-TW1 14.516 0.774857 0.000022 0.70899 0.1735 0.512324 0.000007 0.511918 -6.1 -5.1 1521 PM2-10-TW1 1.8995 0.71988 0.000018 0.71009 0.1190 0.512142 0.000007 0.511860 -9.7 -6.1 1606 PM2-16-TW1 1.0037 0.715145 0.000019 0.70068 0.1121 0.512078 0.000007 0.511821 -10.9 -7.1 1681
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