Zircon U-Pb age, geochemical characteristics and constraints on the Jinshajiang Paleo-Tethys collision of Early-Middle Triassic Malasongduo Formation volcanic rocks from the Gongjue area, Eastern Tibet
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摘要:
金沙江结合带中保留有大量晚古生代—中生代的岩石与构造信息，是研究金沙江古大洋洋陆俯冲-陆陆碰撞演化过程的主要窗口。对贡觉地区早—中三叠世英安岩-流纹岩的锆石U-Pb年龄、全岩地球化学特征进行报道，并探讨其岩石成因与岩浆源区。获得4组长英质火山岩LA-ICP-MS锆石U-Pb年龄，分别为246.2±1.7 Ma、245.5±0.7 Ma、244.7±0.6 Ma与246.2±0.5 Ma，一致指示贡觉地区马拉松多组火山岩的形成时代为245~246 Ma。地球化学分析显示，马拉松多组长英质火山岩具有高Si（SiO2=67.16%~74.62%），高K（K2O=3.44%~5.94%），贫Na（Na2O=1.75%~2.53%），贫Mg（MgO=0.28%~1.04%）的特点。A/CNK值范围为1.07~1.41，总体属过铝质高钾钙碱性岩石。稀土元素配分曲线呈现出轻稀土元素明显右倾，重稀土元素相对平缓的"V"字形；大离子亲石元素Rb、K、Th相对富集，高场强元素Nb、Ta、Sr、Ti相对亏损，指示岩浆来源于古老地壳。研究认为贡觉地区马拉松多组长英质火山岩为金沙江古洋壳西向俯冲造陆背景下，幔源基性岩浆底侵下地壳部分熔融的产物，贡觉地区此时正处于俯冲到碰撞的转换阶段。结合区域地质资料与前人研究，认为金沙江结合带贡觉地区大致经历了二叠纪的俯冲消减、早三叠世俯冲-碰撞转换、中三叠世的陆陆碰撞与晚三叠世的后碰撞造山阶段，直到晚三叠世后期造山运动结束。
Abstract:There is a large number of rock and structural information of the Late Paleozoic-Early Mesozoic retained in the Jinshajiang binding belt, which is the main window to study the evolution of ancient land subduction-land collision in the Jinshajiang.This paper reports the zircon U-Pb age and whole rock geochemical characteristics of the early Middle Triassic dacite-rhyolite in the Gongjue area, and discusses its petrogenesis and magma source area.Based on LA-ICP-MS zircon U-Pb dating, the weighted average U-Pb age of four felsic volcanic rocks is 246.2±1.7 Ma, 245.5±0.7 Ma, 244.7±6 Ma and 246.2±0.5 Ma, respectively, indicating the volcanic rocks were formed at 245~246 Ma.Geochemical analysis shows that felsic volcanic rocks in the study area are rich in Si (SiO2=67.16%~74.62%), rich in K (K2O=3.44%~5.94%), poor in Na (Na2O=1.75%~2.53%) and poor in Mg (MgO=0.28%~1.04%).The A/CNK values range from 1.07 to 1.41, indicating peraluminous high-K calc-alkaline characteristics.The REE distribution curve shows a "V" shape.Large ion lithophile elements and high field strength elements Rb, K, and Th are relatively enriched, while Nb、Ta、Sr and Ti are relatively depleted, indicating that the magma was originated from the ancient crust.It is suggested that the felsic volcanic rocks in the Gongjue area are the products of partial melting of the lower crust caused by the underplating of mantle-derived basic magma under the background of westward subduction of the Jinshajiang ancient oceanic crust, which is in the transition stage of subduction to collision.Combined with regional geological data and previous studies, it is considered that the Gongjue area of Jinshajiang junction belt experienced Permian subduction, Early Triassic subduction-collision transition, Middle Triassic continent- continent collision and Late Triassic post-collision extension, until the end of orogeny in late Late Triassic.
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表 1 贡觉地区马拉松多组英安岩-流纹岩LA-ICP-MS锆石U-Th-Pb分析结果
Table 1. LA-ICP-MS zircon U-Th-Pb data of the dacite and rhyolite from the Malasongduo Formation in the Gongjue area
测点号 含量/10-6 Th/U 同位素比值 年龄/Ma Pb Th U 207Pb/
206Pb1σ 207Pb/
235U1σ 206Pb/
238U1σ 207Pb/
206Pb1σ 207Pb/
235U1σ 206Pb/
238U1σ 20HJ01 1 7.1 56.8 163 0.35 0.055 0.0027 0.29 0.0131 0.0392 0.0005 391 109 259 10 248 3 2 8.5 69.3 198 0.35 0.054 0.002 0.2857 0.0102 0.0385 0.0004 383 85 255 8 244 3 3 18.8 283 407 0.70 0.059 0.0021 0.307 0.011 0.0373 0.0004 583 76 272 9 236 2 4 6.2 49.5 141 0.35 0.066 0.0031 0.3578 0.0165 0.0391 0.0006 820 98 311 12 247 3 5 10.5 91.5 245 0.37 0.053 0.002 0.2798 0.0104 0.0385 0.0004 320 118 250 8 244 3 6 9.2 77.3 213 0.36 0.052 0.0022 0.2783 0.0113 0.0387 0.0005 295 96 249 9 244 3 7 9.7 102 220 0.47 0.052 0.0023 0.2768 0.0117 0.0385 0.0004 300 100 248 9 244 3 8 14.9 184 332 0.56 0.054 0.0019 0.2849 0.0104 0.0382 0.0004 361 81 255 8 241 2 9 9.2 83.9 214 0.39 0.056 0.0025 0.2939 0.0134 0.0381 0.0004 435 134 262 10 241 3 10 9.4 92.5 217 0.43 0.050 0.0025 0.2656 0.0131 0.0383 0.0004 198 113 239 10 242 3 11 14.1 163 313 0.52 0.051 0.0018 0.2716 0.0092 0.0389 0.0004 233 83 244 7 246 2 12 10.0 91.1 223 0.41 0.056 0.0024 0.3013 0.0126 0.0393 0.0004 435 92 267 10 248 3 13 7.2 60.4 168 0.36 0.054 0.0026 0.2807 0.0129 0.0385 0.0005 350 109 251 10 243 3 14 13.1 121 274 0.44 0.067 0.0027 0.3792 0.0157 0.0412 0.0004 833 81 326 12 260 3 15 7.5 55.1 173 0.32 0.056 0.0025 0.3081 0.0136 0.0393 0.0005 478 96 273 11 248 3 16 10.5 86.1 240 0.36 0.056 0.0022 0.3036 0.0113 0.0394 0.0004 456 82 269 9 249 3 17 9.4 94.4 212 0.45 0.055 0.0024 0.2986 0.0127 0.0391 0.0004 433 96 265 10 247 3 18 9.2 85.9 214 0.40 0.053 0.0026 0.283 0.0126 0.0395 0.0005 309 111 253 10 250 3 19 17.0 123 250 0.49 0.151 0.0145 1.3523 0.1783 0.0491 0.0018 2355 165 869 77 309 11 20 8.4 66.5 193 0.34 0.047 0.0019 0.2558 0.0107 0.0397 0.0005 33.4 87 231 9 251 3 21 8.5 75.1 186 0.40 0.060 0.0027 0.3252 0.0143 0.0395 0.0005 591 94 286 11 250 3 22 16.9 194 372 0.52 0.049 0.0017 0.2684 0.009 0.0398 0.0004 143 86 241 7 251 3 23 11.7 111 272 0.41 0.051 0.002 0.2736 0.0104 0.0388 0.0004 256 89 246 8 246 3 24 10.8 92 251 0.37 0.054 0.0021 0.2909 0.0114 0.0387 0.0004 383 85 259 9 245 3 20HJ02-1 1 16.1 134 336 0.40 0.066 0.0025 0.3561 0.0129 0.0394 0.0004 806 80 309 10 249 2 2 7.9 71.6 175 0.41 0.058 0.0029 0.3091 0.0149 0.0389 0.0005 546 107 273 12 246 3 3 15.8 130 364 0.36 0.052 0.0021 0.2763 0.011 0.0389 0.0005 280 90 248 9 246 3 4 42.4 130 973 0.13 0.066 0.0016 0.3557 0.009 0.0389 0.0003 1200 49 309 7 246 2 5 22.3 137 518 0.27 0.052 0.0015 0.2767 0.0082 0.039 0.0003 265 69 248 6 246 2 6 7.2 61 161 0.38 0.050 0.0027 0.2682 0.0146 0.0388 0.0005 211 126 241 12 245 3 7 10.4 107 226 0.47 0.050 0.0024 0.2736 0.0133 0.0392 0.0004 213 111 246 11 248 3 8 10.4 84.7 235 0.36 0.058 0.0023 0.3094 0.012 0.0389 0.0004 517 85 274 9 246 2 9 8.1 82.6 182 0.45 0.050 0.0022 0.2668 0.0121 0.0384 0.0005 211 102 240 10 243 3 10 15.8 74 363 0.20 0.059 0.0019 0.3131 0.0112 0.0385 0.0005 546 72 277 9 244 3 11 10.1 119 225 0.53 0.054 0.0023 0.2831 0.0121 0.038 0.0004 369 64 253 10 240 3 12 9.1 96.1 205 0.47 0.050 0.0024 0.2633 0.0117 0.0388 0.0005 191 113 237 9 246 3 13 26.2 232 595 0.39 0.054 0.0013 0.289 0.0072 0.039 0.0004 354 56 258 6 247 2 14 11.5 144 249 0.58 0.051 0.0023 0.2712 0.0111 0.039 0.0005 239 104 244 9 247 3 15 10.0 66.7 229 0.29 0.052 0.002 0.2796 0.0105 0.039 0.0004 298 89 250 8 247 3 16 9.6 86.8 218 0.40 0.050 0.0024 0.2678 0.0127 0.0387 0.0004 206 111 241 10 245 3 17 10.9 124 239 0.52 0.050 0.0021 0.2688 0.0113 0.0387 0.0004 213 92 242 9 245 3 18 12.7 71.7 301 0.24 0.052 0.0019 0.2771 0.0101 0.0389 0.0004 272 83 248 8 246 2 19 11.3 95.3 256 0.37 0.054 0.0021 0.2876 0.0109 0.0389 0.0004 361 61 257 9 246 2 20 61.4 322 278 1.16 0.073 0.0016 1.5937 0.0349 0.1588 0.0014 1003 40 968 14 950 8 21 14.1 69.5 121 0.57 0.061 0.0021 0.8212 0.027 0.0972 0.0011 652 74 609 15 598 6 22 8.6 75.9 196 0.39 0.055 0.0023 0.2937 0.0127 0.0389 0.0005 398 93 261 10 246 3 23 34.7 168 433 0.39 0.055 0.0014 0.5416 0.014 0.0714 0.0006 406 56 439 9 445 4 24 9.8 94.4 219 0.43 0.052 0.0021 0.2769 0.0108 0.0388 0.0004 333 95 248 9 246 2 20HJ02-2 1 13.5 54.6 324 0.17 0.053 0.0017 0.2852 0.0091 0.0392 0.0003 317 74 255 7 248 2 2 15.9 125 327 0.38 0.077 0.0029 0.4203 0.0152 0.0396 0.0004 1126 74 356 11 250 2 3 9.0 95.7 200 0.48 0.051 0.0022 0.2686 0.0108 0.0388 0.0004 233 100 242 9 245 3 4 8.1 58.3 145 0.40 0.060 0.0027 0.4018 0.0183 0.049 0.001 617 103 343 13 308 6 5 10.7 101 241 0.42 0.053 0.0023 0.2819 0.012 0.0387 0.0004 328 100 252 10 245 2 6 33.0 193 774 0.25 0.066 0.0019 0.3453 0.0104 0.0377 0.0003 809 65 301 8 239 2 7 15.2 106 348 0.31 0.060 0.002 0.3204 0.0106 0.0386 0.0004 606 38 282 8 244 2 8 16.0 183 365 0.50 0.051 0.0019 0.2728 0.0107 0.0384 0.0005 261 87 245 9 243 3 9 37.4 60.1 358 0.17 0.080 0.0025 1.2043 0.0828 0.0989 0.0054 1199 60 803 38 608 32 10 7.9 87.8 170 0.52 0.053 0.0022 0.285 0.0112 0.0393 0.0004 320 90 255 9 249 3 11 6.4 50.3 145 0.35 0.055 0.0029 0.294 0.0143 0.0392 0.0005 417 117 262 11 248 3 12 15.1 72.2 357 0.20 0.059 0.0022 0.312 0.011 0.0388 0.0004 550 81 276 9 246 3 13 14.6 41.1 360 0.11 0.053 0.0019 0.2795 0.01 0.0386 0.0003 306 77 250 8 244 2 14 13.2 95.6 301 0.32 0.049 0.0017 0.2651 0.0093 0.0394 0.0004 143 81 239 7 249 3 15 23.7 392 477 0.82 0.052 0.0015 0.2761 0.0082 0.0387 0.0003 272 64 248 7 245 2 16 15.8 65.7 380 0.17 0.052 0.0018 0.2739 0.0093 0.0386 0.0004 333 81 246 7 244 2 17 9.9 100 222 0.45 0.053 0.0023 0.2813 0.0119 0.0386 0.0005 339 98 252 9 244 3 18 9.4 58.6 220 0.27 0.049 0.002 0.2592 0.0103 0.0386 0.0005 167 98 234 8 244 3 19 19.2 64.9 471 0.14 0.051 0.0015 0.2669 0.008 0.0383 0.0003 217 70 240 6 242 2 20 13.5 68.8 319 0.22 0.054 0.0019 0.2843 0.0104 0.0384 0.0004 354 80 254 8 243 2 21 17.2 153 317 0.48 0.098 0.0036 0.5463 0.0199 0.0404 0.0004 1591 69 443 13 255 3 22 11.3 121 251 0.48 0.052 0.0023 0.2769 0.0116 0.0386 0.0004 298 100 248 9 244 3 23 10.9 135 226 0.60 0.069 0.0028 0.3702 0.0159 0.0385 0.0005 909 84 320 12 243 3 24 11.8 115 267 0.43 0.051 0.0019 0.2728 0.0102 0.0386 0.0004 256 82 245 8 244 2 20HJ03 1 12.4 130 272 0.48 0.054 0.0023 0.2949 0.0129 0.0392 0.0004 383 94 262 10 248 3 2 12.7 120 281 0.43 0.053 0.0024 0.2842 0.0116 0.0392 0.0004 328 106 254 9 248 3 3 12.1 157 255 0.62 0.053 0.0024 0.2875 0.0128 0.0392 0.0004 328 104 257 10 248 3 4 130.2 358 715 0.50 0.073 0.0012 1.5444 0.0253 0.1526 0.001 1014 31 948 10 916 5 5 11.5 60.3 272 0.22 0.052 0.002 0.2786 0.0107 0.0391 0.0004 276 86 250 8 247 3 6 15.6 255 313 0.81 0.049 0.0019 0.2657 0.0103 0.0393 0.0004 132 91 239 8 249 3 7 13.8 74.8 327 0.23 0.049 0.0017 0.266 0.009 0.0392 0.0004 167 83 240 7 248 2 8 13.6 70.4 324 0.22 0.051 0.002 0.274 0.0107 0.0392 0.0005 228 93 246 9 248 3 9 8.9 87.6 198 0.44 0.053 0.002 0.2864 0.0109 0.0391 0.0004 332 87 256 9 247 3 10 13.2 61.9 315 0.20 0.052 0.0018 0.2833 0.0093 0.0392 0.0003 302 84 253 7 248 2 11 17.0 94 402 0.23 0.053 0.0016 0.2848 0.0088 0.039 0.0004 322 75 254 7 247 2 12 12.2 59.3 292 0.20 0.053 0.002 0.2847 0.0107 0.039 0.0004 320 87 254 8 247 3 13 16.6 79.4 404 0.20 0.050 0.0016 0.264 0.0086 0.0383 0.0004 189 74 238 7 242 2 14 21.4 200 492 0.41 0.053 0.0016 0.2778 0.0084 0.0379 0.0003 320 68 249 7 240 2 15 68.9 1473 1276 1.16 0.053 0.0012 0.2903 0.0069 0.0392 0.0003 339 50 259 5 248 2 16 10.7 152 229 0.66 0.055 0.0023 0.2876 0.012 0.0382 0.0005 394 96 257 9 242 3 17 16.6 63.8 400 0.16 0.052 0.002 0.2772 0.0105 0.0387 0.0004 272 86 248 8 245 2 18 9.7 102 211 0.49 0.051 0.0022 0.2715 0.0115 0.0391 0.0004 220 102 244 9 247 3 19 13.1 129 287 0.45 0.056 0.0022 0.2977 0.0112 0.039 0.0004 435 89 265 9 247 3 20 14.3 35.7 349 0.10 0.051 0.0017 0.2726 0.0094 0.0388 0.0004 235 84 245 7 245 2 21 15.7 91.6 369 0.25 0.053 0.0019 0.2845 0.0102 0.0387 0.0004 339 83 254 8 245 2 22 12.6 107 282 0.38 0.052 0.002 0.2784 0.0103 0.0391 0.0004 283 89 249 8 247 2 23 16.6 77.2 393 0.20 0.050 0.0016 0.2711 0.0081 0.0392 0.0004 213 42 244 6 248 2 24 15.9 198 350 0.57 0.051 0.0019 0.2689 0.0096 0.0386 0.0004 220 53 242 8 244 2 
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表 2 贡觉地区马拉松多组英安岩-流纹岩主量、微量和稀土元素数据
Table 2. Major, trace element and REE compositions of the dacite and rhyolite from Malasongduo Formation in the Gongjue area
元素 20HJ-03-
YQ120HJ-03-
YQ220HJ-02-
YQ120HJ-02-
YQ220HJ-02-
YQ320HJ-02-
YQ420HJ-02-
YQ520HJ-02-
YQ620HJ-01-
YQ120HJ-01-
YQ4SiO2 73.58 71.89 67.54 67.16 71.77 71.94 74.62 77.77 72.41 73.22 Al2O3 12.58 13.05 12.83 12.88 12.71 12.85 12.73 11.51 10.45 12.96 CaO 0.37 0.40 2.51 2.59 0.52 0.44 0.33 0.32 3.15 0.41 MgO 0.68 0.55 0.96 0.94 1.04 0.98 0.41 0.37 0.31 0.28 K2O 5.29 4.75 4.09 4.17 5.00 4.89 5.94 4.98 3.44 4.96 Na2O 1.97 2.37 1.75 1.90 2.14 2.26 1.97 1.78 1.93 2.36 TiO2 0.48 0.63 0.80 0.78 0.61 0.63 0.35 0.33 0.25 0.34 P2O5 0.17 0.17 0.15 0.14 0.16 0.16 0.17 0.15 0.068 0.088 MnO 0.025 0.029 0.047 0.063 0.058 0.051 0.027 0.02 0.074 0.025 Fe2O3 2.87 3.70 4.90 4.76 3.99 3.87 1.20 1.28 3.52 3.30 烧失量 1.86 2.35 4.29 4.45 1.88 1.79 1.57 1.42 4.25 1.91 总计 99.9 99.9 99.9 99.8 99.9 99.9 99.3 99.9 99.9 99.9 Cu 1.86 1.73 21.4 17.0 5.64 28.1 1.79 1.62 4.55 52.5 Pb 3.85 5.09 45.6 36.6 27.4 19.0 2.05 2.06 12.8 14 Zn 40.3 35.2 27.4 23.3 74.8 80.1 15.3 14.8 48.8 59.5 Cr 14.8 19.3 37.9 34.8 20.9 22.7 7.01 8.54 3.88 3.86 Ni 5.82 9.84 15.4 14.6 7.78 8.30 1.44 1.22 0.75 0.66 Co 4.44 4.99 8.81 8.58 5.41 4.90 1.80 1.64 1.96 1.61 Li 12.9 8.94 30.7 27.4 20.9 21.1 8.40 10.0 7.03 3.98 Rb 228 231 162 157 224 219 246 231 149 229 Cs 30.4 32.9 6.62 6.63 5.19 4.96 7.67 6.57 10.4 11.7 Sr 39.1 39.8 52.9 59.4 62.0 63.3 27.1 22.2 81.7 32.5 Ba 822 710 784 800 807 803 622 524 948 1040 V 29.6 45.0 74.2 68.2 42.0 42.2 26.5 21.1 18.1 19.3 Sc 6.56 9.99 14.1 13.6 5.27 9.51 4.21 3.34 6.10 9.69 Nb 13.0 15.1 16.4 15.9 14.5 14.4 12 10.9 14.0 18.7 Ta 1.16 1.33 1.34 1.32 1.26 1.22 1.13 1.00 1.10 1.81 Zr 239 287 306 298 275 283 206 186 296 379 Hf 7.31 8.3 9.83 9.06 8.61 8.46 6.8 5.93 9.71 12.8 Be 1.63 1.81 1.53 1.56 1.42 1.58 1.16 1.1 2.38 2.14 Ga 16.5 16.9 17.7 17.6 16.6 16.7 15.9 14.8 15.5 22.2 Sn 4.28 3.9 3.71 3.72 3.8 3.77 5.06 4.4 5.73 4.98 Tl 1.11 1.09 0.85 0.85 1.14 1.07 1.16 1.02 0.68 1.02 U 4.32 4.37 4.43 4.44 5.49 4.52 5.16 4.16 3.09 5.28 Th 21.9 23.9 26.1 24 15.6 20.9 21.9 16.6 12.5 22.6 La 34 32.7 57.1 49.1 29.7 30.8 21.1 25.2 27.1 49.7 Ce 72.5 82.4 104 101 84.4 60.5 39.6 65.3 63.2 95.2 Pr 8.12 7.94 12.2 13 6.44 7.91 5.11 5.17 7.25 11.6 Nd 30.2 28.2 51 46.8 20.6 25.2 18.8 17.4 24.2 42.6 Sm 5.22 4.53 7.56 7.9 3.17 4.24 3.07 2.94 5.32 7.68 Eu 0.89 0.86 1.4 1.54 0.73 0.83 0.53 0.44 1.15 1.44 Gd 5.43 4.84 8.23 8.14 3.87 4.51 3.36 3.2 4.87 7.64 Tb 1.03 0.98 1.68 1.67 0.67 0.89 0.67 0.58 1.09 1.57 Dy 4.62 5.17 8.23 8.2 3.13 4.12 3.45 2.4 7.12 8.14 Ho 0.89 0.92 1.55 1.54 0.53 0.84 0.67 0.42 1.42 1.65 Er 2.66 2.92 4.55 4.64 1.6 2.46 1.9 1.4 3.96 4.97 Tm 0.37 0.45 0.68 0.72 0.23 0.39 0.33 0.2 0.73 0.75 Yb 2.46 2.85 4.39 4.46 1.46 2.65 1.97 1.46 4.76 5.15 Lu 0.32 0.34 0.55 0.58 0.19 0.31 0.24 0.17 0.61 0.63 Y 21.1 24.1 39 40.4 14.1 20.8 17.4 12.1 39.6 42.4 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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① 西藏自治区地质调查院一分院.中华人民共和国1∶ 25 万贡觉县幅(H47C002002)地质图.2007.
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