Petrogenesis and tectonic setting of the Late Permian A-type granitic dyke swarm in Ulungur, East Junggar
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摘要:
中亚造山带西南缘的东准噶尔地区出露大量晚古生代花岗岩，是揭示该造山带地壳演化的良好对象。在东准噶尔北缘乌伦古西北的阿克吉拉识别出一套走向与区域构造线总体垂直的晚古生代花岗质岩墙，其时代和成因研究对深入理解本区的构造演化具有重要意义。SHRIMP锆石U-Pb测年结果显示其侵位于晚二叠世（266±2 Ma）。岩石地球化学组成上，它们具有高硅（SiO2=75.66%~76.69%）、富碱（Na2O+K2O=8.67%~9.16%）、低钙（CaO=0.06%~0.14%）和镁（MgO=0.04%~0.06%）的特征；具有明显的负Eu异常（δEu=0.16~0.18），相对亏损Ba、Sr、P、Ti等，明显富集Nb、Zr、Th、Ta、Hf等高场强元素，具有较大的Ga/Al值（>2.6），指示该花岗岩属弱过铝质A1型花岗岩。岩石具有正的εNd（t）值（+4.7）和年轻的模式年龄（655 Ma），暗示源区物质主要为年轻幔源物质。综合分析，推测该岩墙形成于后碰撞环境，由地幔上涌引起新生下地壳部分熔融而成。
Abstract:A large number of Late Paleozoic granites occur in the East Junggar on the southwest margin of the Central Asian Orogenic belt, providing a good chance to reveal the crustal evolution of the Central Asian Orogenic Belt. In this study, a series of Late Paleozoic granitic dykes striking vertically to the suture zone were recognized in Akejila, northwest of Ulungur of East Junggar. Their timing of emplacement and petrogenesis are critical to understand the tectono-crustal evolution of the study area. SHRIMP zircon U-Pb dating yielded a Late Permian age (266±2 Ma). Geochemical analyses indicate that they are characterized by relatively high concentration of silica (SiO2=75.66%~76.69%) and alkali (Na2O+K2O=8.67%~9.16%), but low calcium (CaO =0.06%~0.14%) and magnesia (MgO =0.04%~0.06%)content. The obvious negative Eu anomaly (δEu=0.16~0.18), relative depletion of Ba, Sr, P and Ti, and significant enrichment of Nb, Zr, Th, Ta and Hf, as well as high Ga/Al value (>2.6) characterize the weakly peraluminous A1 type granites. The positive εNd(t) value (+4.7) and a young model age (655 Ma) suggest that these dykes are mainly derived from the juvenile mantle. Therefore, the comprehensive analysis indicates that the dykes were formed by the partial melting of the juvenile lower crust caused by the upwelling of the mantle in a post-collision setting.
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Key words:
- East Junggar /
- A-type granite /
- U-Pb age /
- Permian /
- post-collision
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表 1 东准噶尔阿克吉拉细晶花岗岩(X19726-1.1)SHRIMP锆石U-Pb同位素分析结果
Table 1. SHRIMP zircon U-Pb analytical results of the aplite granite of the Akejila pluton from the East Junggar
测点 Pbrad/10-6 238U/10-6 232Th/10-6 Th/U 同位素比值 年龄/Ma 207Pb/206Pb 1σ 207Pb/235U 1σ 206Pb/238U 1σ 207Pb/206Pb 1σ 207Pb/235U 1σ 206Pb/238U 1σ 1 683.0 7297.0 31770.7 4.4 0.05756 0.00100 0.33286 0.00679 0.04206 0.00081 513 20 292 5 266 5 2 27.2 533.4 333.2 0.6 0.05554 0.00104 0.32428 0.00728 0.04207 0.00059 434 26 285 6 266 4 3 34.5 656.8 585.9 0.9 0.05536 0.00138 0.32195 0.01068 0.04190 0.00056 427 50 283 8 265 3 4 31.0 577.3 501.7 0.9 0.05264 0.00167 0.31719 0.00924 0.04211 0.00102 313 30 280 7 266 6 5 89.4 1714.9 1532.1 0.9 0.05499 0.00097 0.31745 0.00646 0.04196 0.00070 412 21 280 5 265 4 6 34.8 701.7 485.0 0.7 0.05296 0.00111 0.30538 0.00840 0.04201 0.00102 327 28 271 7 265 6 7 18.6 339.7 207.2 0.6 0.04703 0.00187 0.30342 0.00667 0.04200 0.00075 51 24 269 5 265 5 8 49.5 1008.1 870.9 0.9 0.05564 0.00119 0.31814 0.00816 0.04204 0.00094 438 26 280 6 265 6 9 27.7 504.9 343.1 0.7 0.05096 0.00164 0.32316 0.00719 0.04211 0.00055 239 28 284 6 266 3 10 506.3 6177.0 22562.9 3.7 0.05532 0.00119 0.31796 0.00945 0.04206 0.00107 425 30 280 7 266 7 11 30.8 608.5 437.3 0.7 0.05235 0.00120 0.30142 0.00740 0.04206 0.00071 301 28 268 6 266 4 12 36.6 748.1 624.2 0.8 0.05359 0.00086 0.30827 0.00617 0.04206 0.00068 354 21 273 5 266 4 13 27.0 480.5 408.2 0.8 0.04900 0.00185 0.30826 0.00773 0.04206 0.00068 148 30 273 6 266 4 14 40.1 861.6 514.2 0.6 0.05525 0.00108 0.31669 0.00736 0.04202 0.00076 422 24 279 6 265 5 15 38.8 798.7 546.9 0.7 0.05475 0.00111 0.31453 0.00695 0.04208 0.00066 402 24 278 5 266 4 16 24.9 440.2 344.3 0.8 0.06286 0.01484 0.30555 0.00766 0.04200 0.00070 703 27 271 6 265 4 17 49.3 1020.5 744.6 0.7 0.05591 0.00122 0.32230 0.00811 0.04204 0.00070 449 28 284 6 265 4 18 92.8 1847.7 1851.8 1.0 0.05492 0.00116 0.31212 0.00992 0.04176 0.00128 409 32 276 8 264 8 19 52.2 1092.0 796.4 0.7 0.05402 0.00133 0.30890 0.00853 0.04209 0.00092 372 29 273 7 266 6 20 40.1 781.0 842.4 1.1 0.05500 0.00130 0.31751 0.00913 0.04196 0.00078 412 33 280 7 265 5 
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表 2 阿克吉拉细晶花岗岩主量、微量和稀土元素分析结果
Table 2. Analytical results of major, trace elements and REE of the Akejila aplite granites
样品 X19726-1.1 X19726-1.2 X19726-1.3 X19726-1.4 X19726-1.5 样品 X19726-1.1 X19726-1.2 X19726-1.3 X19726-1.4 X19726-1.5 SiO2 76.41 76.25 76.26 76.69 75.66 Sc 2.0 2.0 2.0 2.0 2.0 TiO2 0.11 0.11 0.11 0.11 0.11 Be 3.0 1.0 5.0 3.0 4.0 Al2O3 12.59 12.73 12.69 12.78 12.92 Cs 0.5 0.3 0.4 0.2 0.4 Fe2O3 1.10 1.21 1.26 0.97 1.17 Sn 2.0 3.0 3.0 2.0 2.0 MnO 0.01 0.01 0.01 0.01 0.01 W 1.2 1.5 1.1 1.0 1.3 MgO 0.06 0.05 0.07 0.04 0.06 Mo 0.9 2.2 1.8 1.6 1.1 CaO 0.07 0.06 0.14 0.06 0.06 Cu 0.6 0.4 0.5 0.3 0.5 Na2O 4.32 4.57 4.20 4.28 4.54 Pb 0.5 1.8 1.6 1.4 1.1 K2O 4.55 4.21 4.47 4.57 4.62 Zn 5.0 9.0 10.0 4.0 8.0 P2O5 0.01 0.01 0.01 0.02 0.01 As 1.5 1.4 1.1 1.0 0.9 FeO 0.20 0.20 0.21 0.20 0.20 Au 0.5 0.5 3.6 0.5 0.5 烧失量 0.70 0.70 0.70 0.40 0.80 Tl 0.1 0.1 0.1 0.1 0.1 总计 99.23 99.21 99.22 99.53 99.16 Se 0.5 0.5 0.5 0.5 0.5 Mg# 0.35 0.31 0.37 0.26 0.35 Hf 7.7 7.5 7.1 7.4 8.2 K2O+Na2O 8.87 8.78 8.67 8.85 9.16 Ta 2.0 1.90 1.9 2.0 2.0 A/NK 1.05 1.05 1.08 1.07 1.04 Th 14.3 13.20 13.80 14.1 15.7 A/CNK 1.04 1.04 1.06 1.06 1.03 U 2.9 3.20 3.60 2.40 3.7 La 12.30 35.00 34.40 29.10 32.60 Co 0.3 0.3 0.2 0.3 0.4 Ce 22.80 64.70 68.40 57.60 64.40 Ni 20.0 20.0 20.0 20.0 20.0 Pr 2.74 7.39 7.31 6.06 6.87 Rb 78.7 72.5 80.4 80.6 84.3 Nd 9.30 24.30 23.60 19.60 22.20 Sr 16.2 18.1 19.9 14.3 22.2 Sm 2.11 4.79 4.92 4.24 4.52 Ga 18.7 18.7 18.8 18.7 18.2 Eu 0.13 0.28 0.27 0.23 0.26 V 8.0 8.0 10.0 8.0 8.0 Gd 2.66 4.54 4.76 4.33 4.47 Zr 201.4 184.1 176.7 189.4 202.3 Tb 0.57 0.80 0.82 0.79 0.83 Nb 33.9 31.6 31.9 32.5 33.7 Dy 3.81 4.90 5.09 5.06 5.17 Ba 33.0 32.0 36.0 33.0 37.0 Ho 0.89 1.10 1.10 1.17 1.17 ΣREE 91.26 187.88 192.48 170.09 184.70 Er 3.07 3.53 3.44 3.48 3.47 LREE 49.38 136.46 138.90 116.83 130.85 Tm 0.51 0.53 0.54 0.57 0.56 HREE 41.88 51.42 53.58 53.26 53.85 Yb 3.60 3.59 3.51 3.98 3.88 LR/HR 1.18 2.65 2.59 2.19 2.43 Lu 0.57 0.53 0.52 0.58 0.60 δEu 0.17 0.18 0.17 0.16 0.18 Y 26.20 31.90 33.80 33.30 33.70 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 东准噶尔乌伦古花岗岩带主要富碱花岗岩Sm-Nd同位素特征
Table 3. The Sm-Nd isotope data of the alkali-rich granites from Ulungur granite belt in the East Junggar
样品号 岩性 年龄/Ma Sm Nd 147Sm/144Nd 143Nd/144Nd 2α εNd(t) TDM/Ma T2DM/Ma 参考文献 X19726-1.1 细晶花岗岩 265 2.11 9.30 0.1372 0.512848 1 4.7 745 655 本文 08WLG-13 A型花岗岩 308 8.07 38.72 0.1260 0.512769 8 5.3 665 635 [52] 08WLG-16 A型花岗岩 308 7.36 41.60 0.1070 0.512749 7 5.7 575 606 [52] 08WLG-17 A型花岗岩 308 9.64 54.37 0.1072 0.512746 7 5.6 581 612 [52] 08WLG-07 A型花岗岩 308 12.90 62.29 0.1252 0.512809 6 6.0 590 568 [52] G40 过碱性花岗岩 325 9.6 52.00 0.1116 0.51272 14 5.18 640 670 [32] G46 过碱性花岗岩 325 10.3 40.5 0.1539 0.51282 12 5.4 840 650 [32] G72 过碱性花岗岩 322.1 8.5 50 0.1041 0.51268 11 4.57 650 710 [32] G81 过碱性花岗岩 322.1 5.6 32.4 0.1052 0.51272 10 5.43 600 650 [32] G20 二长花岗岩 322 4.2 23.3 0.1093 0.51271 14 5.1 640 680 [32] G29 二长花岗岩 322 3.45 18.9 0.1103 0.51273 12 5.42 620 650 [32] OT01 花岗闪长岩 309.6 3.49 16.4 0.1287 0.5128 13 5.95 630 600 [32] OT09 花岗闪长岩 309.6 4.04 18.6 0.1313 0.51283 12 6.4 590 560 [32] KLP04 花岗闪长岩 314.7 5.7 28.5 0.1207 0.51279 10 6.05 590 590 [32] G120 正长花岗岩 308.5 3.96 17.4 0.1381 0.51286 10 6.69 590 530 [32] JR2 过碱性花岗岩 300 13.49 70.58 0.1155 0.512792 6 6.09 557 [28] JR6 过碱性花岗岩 300 13.33 67.13 0.1201 0.512829 5 6.67 523 [28] SW1 过碱性花岗岩 300 15.09 88.33 0.1033 0.512788 7 6.47 501 [28] SW2 过碱性花岗岩 300 14.74 76.43 0.1166 0.512806 8 6.37 541 [28] SW3 过碱性花岗岩 300 9.90 42.75 0.1400 0.512811 6 5.56 702 [28] SW5 过碱性花岗岩 300 16.60 78.29 0.1282 0.512817 5 6.13 594 [28] SW6 过碱性花岗岩 300 12.33 62.52 0.1192 0.512797 6 6.04 570 [28] SW8 过碱性花岗岩 300 9.96 45.55 0.1323 0.512827 5 6.17 606 [28] SR6 过碱性花岗岩 300 5.15 19.79 0.1574 0.512848 6 5.61 819 [28] SR121 过碱性花岗岩 300 12.02 56.00 0.1297 0.512769 4 5.12 692 [28] SR127 过碱性花岗岩 300 9.59 33.68 0.1722 0.512877 6 5.56 1003 [28] STS6 过碱性花岗岩 300 9.30 46.29 0.1214 0.512751 5 5.06 660 [28] STS9 碱性脉 300 2.94 17.24 0.1031 0.512737 10 5.54 570 [28] STS86 过碱性花岗岩 300 9.08 34.09 0.1611 0.512847 4 5.44 878 [28] XCH1 铝质花岗岩 270 7.06 32.09 0.1330 0.5128 7.00 5.55 641 [28] XCH2 铝质花岗岩 270 5.52 26.19 0.1275 0.5128 9.00 5.84 591 [28] XCH4 铝质花岗岩 270 7.51 31.82 0.1427 0.5128 9.00 5.52 694 [28] XCH6 铝质花岗岩 270 7.1 31.37 0.1368 0.5128 14.00 5.85 627 [28] XCH11 铝质花岗岩 270 6.55 32.73 0.1211 0.5128 15.00 5.51 597 [28]
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表 4 东准噶尔乌伦古带富碱性花岗岩带主要岩体形成时代
Table 4. The age data of alkali-rich granites from Ulungur granite belt in the East Junggar
样号 岩体 年龄/Ma 误差/Ma 岩性 参考文献 X19726-1 阿克吉拉 265 1.9 A型花岗岩 本文 08WLG-07 杰德卡拉 291 A型花岗岩 [52] JR1 杰德卡拉 314.2 5.2 过碱性花岗岩 [28] LNB111 轮安北 300 过碱性花岗岩 [28] SR3 萨尔铁列克 292 碱性花岗岩 [45] 08WLG-13 萨尔铁列克 308 A型花岗岩 [52] SR121 萨尔铁列克 322.1 2.2 过碱性花岗岩 [28] SW1 萨吾德格尔 311.2 2.5 过碱性花岗岩 [28] STS5 塔斯嘎克 325 2 过碱性花岗岩 [28] G40 塔斯嘎克 301 过碱性花岗岩 [32] KLP02 库日喀孜干 314.7 2 正长花岗岩 [32] G76 萨尔铁列克 322.1 2.2 石英花岗岩 [32] G49 南-塔斯嘎克 325 2 过碱性花岗岩 [32] W-1 阿舒达斯 319.3 2.5 碱性花岗岩 [32] 02ET01 二台东 273 32 富碱闪长岩 [34] St7 萨尔铁列克 302 霓石钠铁闪石花岗岩 [29] St12-1 萨尔铁列克 294 钠铁闪石细晶花岗岩 [29] C8 塔斯嘎克 309 黑云母花岗岩 [29] SW5 萨吾德格尔 300 碱性花岗岩 [45] YP-3 蕴都卡拉 315.2 碱性花岗岩 [65] ZHB-1 扎河坝 250 碱性长石花岗岩 [66] ZHB-7 扎河坝 250 钾长花岗岩 [66] J12 恰库尔特 255 2.4 碱性花岗岩 [67]
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