LA-ICP-MS zircon U-Pb dating and geochemical characteristics of the volcanic rocks in Deren Formation, northern Liaoning Province
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摘要:
通过对辽北平岗盆地中德仁组火山岩的岩石学、地球化学和年代学的研究，探讨了其岩石成因、形成时代、构造环境，以及华北克拉通东部岩石圈减薄时间和减薄机制。用LA-ICP-MS技术测定了平岗盆地中德仁组中部英安质角砾晶屑岩屑凝灰岩和上部流纹岩中的锆石U-Th-Pb同位素组成。获得前者的锆石206Pb/238U年龄为246.8±3.5Ma和169.6±4.6Ma，代表了2期岩浆活动的年龄，是平岗盆地基底早三叠世和中侏罗世岩浆活动的表现；后者的锆石206Pb/238U年龄为117.0±0.9Ma，表明流纹岩形成于早白垩世。德仁组火山岩富集大离子亲石元素K、Rb、Ba，亏损高场强元素Nb、Ta、Zr、Hf、Y、Yb；富集轻稀土元素，亏损重稀土元素，稀土元素配分曲线呈右倾型，表现出壳源特征。德仁组火山岩形成于活动大陆边缘火山弧环境，原始岩浆来源于盆地基底岩浆岩重熔。研究区在117~135Ma期间，发生了由正地形向负地形的重大转变，区域上发育伸展盆地和变质核杂岩，并在基底岩石重熔过程中受到地幔混染作用，表明研究区在早白垩世发生了岩石圈减薄，且减薄的起始时间早于117.0±0.9Ma，减薄机制为拆沉作用。
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关键词:
- 平岗盆地 /
- 德仁组火山岩 /
- LA-ICP-MS锆石U-Pb测年 /
- 岩石圈减薄 /
- 英安质角砾晶屑岩屑凝灰岩 /
- 流纹岩
Abstract:This paper presents detailed petrologic, geochemical and geochronologic data of the volcanic rocks in Deren Formation of Pinggang Basin, northern Liaoning Province. The authors investigated their petrogenesis, formation age and tectonic settings and discussed the thinning time and mechanism of North China Craton. The LA-ICP-MS zircon U-Pb dating was conducted on dacitic breccia-crystal-lithic tuff in Deren Formation and the upper rhyolite. The former yielded 206Pb/238U ages of 246.8±3.5Ma and 169.6±4.6Ma which are supposed to represent two stages of magmatism, reflecting the Early Triassic and Middle Cretaceous magma activities in the basement of Pinggang Basin. The latter yielded 206Pb/238U age of 117.0±0.9Ma, which indicates that the rhyolites were formed in the Early Cretaceous. Volcanic rocks in Deren Formation are enriched in large ion lithophile elements (e.g., K, Rb, Ba) but are depleted in high field strength elements (e.g., Nb, Ta, Zr, Hf, Y, Yb). Besides, due to enrichment of LREEs and depletion of HREEs, the REE patterns exhibit right-inclined feature. These geochemical characteristics show that the source of the primitive magma was derived from the crust, and they were probably formed at the setting of volcanic arc along the active continental margins, resulting from remelting of the basement magma rocks. Major changes from positive to negative landform in the study area occurred during 117~135Ma. In combination with wide distribution of extensional basins and metamorphic core complexes, the authors hold that the magma might have been affected by mantle contamination during remelting of these basement rocks, and the thinning of lithosphere might have occurred during Early Cretaceous (earlier than 117±1.2Ma), which resulted in the delamination.
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表 1 德仁组火山岩主量、微量和稀土元素分析结果
Table 1. Major, trace and rare earth elements of the volcanic rocks in Deren Formation
编号 PM020-20-TY1 PM020-25-TY1 PM020-26-TY1 PM020-27-TY1 PM020-19-TY1 PM022-10-TY1 PM022-20-TY1 PM020-18-TY1 PM022-6-TY1 PM022-6-TY2 岩性 流纹岩 流纹岩 流纹岩 流纹岩 英安岩 桁面岩 桁安岩 桁安岩 玄武桁安岩 玄武桁安岩 SiO2 72.2 71.4 73.24 73.64 66.14 62.18 61.14 62.12 49.68 51.80 TiO2 0.22 0.23 0.22 0.12 0.65 0.82 0.99 0.79 1.76 1.36 Al2O3 13.55 14.45 13.60 13.70 17.00 17.00 15.80 17.05 16.97 19.62 Fe2O3 1.26 1.10 1.26 0.92 0.77 2.70 2.01 1.86 4.69 1.84 Fe0 1.83 1.77 1.42 1.51 3.47 2.51 3.15 3.44 5.63 4.89 MnO 0.07 0.07 0.1 0.06 0.08 0.12 0.12 0.12 0.11 0.13 MgO 0.26 0.36 0.3 0.2 1.29 2.63 2.58 1.42 4.90 3.88 CaO 0.34 0.56 0.5 0.36 2.00 1.33 2.40 4.08 2.92 2.05 Na2O 3.63 3.76 3.67 3.95 3.22 4.22 4.53 4.39 2.92 4.60 K2O 4.92 4.39 4.62 4.46 3.89 4.10 2.93 2.77 4.54 3.95 P2O3 0.05 0.05 0.03 0.09 0.16 0.23 0.34 0.22 1.00 0.88 总计 98.33 98.14 98.96 99.01 98.67 97.84 95.99 98.26 95.12 95.0 烧失量 0.79 1.05 0.61 0.81 1.21 2.16 3.29 0.94 3.87 4.13 K 40255 35919 37801 36492 31828 33546 23973 22664 37146 32319 Rb 124 102 171 163 139 106 54.6 93 126 88.3 Ba 620 923 358 246 861 1367 1054 634 2587 2174 Th 8.65 8.65 12.7 14.0 8.95 9.24 4.62 9.52 9.69 10.0 Ta 1.07 1.25 1.84 1.95 1.37 0.69 0.56 1.20 1.23 1.14 Nb 15.3 14.6 17.2 15.9 15.9 12.0 12.7 13.5 28.5 29.6 Zr 430 453 380 384 459 527 260 504 443 507 Hf 12.2 11.6 11.3 12.3 11.2 12.7 7.32 11.4 12.7 11.3 Sr 49.3 87.4 77.1 41.7 337 481 618 466 1014 1570 A/CNK 1.137 1.209 1.138 1.144 1.293 1.052 1.032 0.967 0.911 1.038 σ43 2.48 2.32 2.26 2.3 2.16 3.52 2.92 2.63 6.66 7.03 La 31.5 35.4 34.5 46.6 35.0 32.7 38.6 34.9 57.0 65.1 Ce 82.4 87.5 89.6 86.5 71.4 62.6 72.1 70.1 105 114 Pr 8.13 8.46 8.44 11.2 8.47 7.92 8.95 8.08 13.8 14.8 Nd 31.1 30.4 32.4 44.7 33.2 27.6 32.4 30.2 52.7 51.1 Sm 5.07 4.86 5.78 8.69 5.43 5.18 5.40 5.32 8.04 8.30 Eu 0.66 0.79 0.50 0.54 1.31 1.59 1.54 1.50 2.39 2.46 Gd 4.51 4.00 4.86 7.00 4.64 4.97 5.09 4.75 6.93 7.01 Tb 0.74 0.66 0.89 1.24 0.74 0.74 0.65 0.77 0.92 1.01 Dy 4.25 3.57 5.38 6.86 4.01 4.02 3.15 4.53 4.00 4.28 Ho 0.73 0.64 1.05 1.32 0.76 0.80 0.69 0.95 0.90 0.96 Er 2.46 1.97 2.99 4.04 2.16 2.16 1.72 2.72 2.34 2.42 Tm 0.40 0.32 0.58 0.67 0.35 0.31 0.25 0.41 0.32 0.28 Yb 2.75 2.01 3.59 4.17 2.08 1.81 1.56 2.55 2.19 2.09 Lu 0.41 0.34 0.52 0.67 0.36 0.33 0.27 0.43 0.32 0.32 Y 22.0 18.9 29.7 36.7 20.0 23.0 18.2 24.3 22.1 23.2 ΣREE 197 200 221 261 190 176 191 192 279 297 LREE/HREE 9.78 12.39 8.62 7.63 10.25 9.09 11.88 8.77 13.33 13.92 (La/Yb)N 7.72 11.87 6.48 7.53 11.35 12.18 16.69 9.23 17.54 21.00 δEu 0.41 0.53 0.28 0.21 0.78 0.95 0.89 0.89 0.96 0.96 La/Sm 6.21 7.28 5.97 5.36 6.45 6.31 7.15 6.56 7.09 7.84 Gd/Yb 1.64 1.99 1.35 1.68 2.23 2.75 3.26 1.86 3.16 3.35 Sm/Nd 0.16 0.16 0.18 0.19 0.16 0.19 0.17 0.18 0.15 0.16 注: 主量元素含量单位为%，微量和稀土元素含量为10-6 
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表 2 德仁组火山岩LA-ICP-MS锆石U-Th-Pb同位素分析结果
Table 2. LA-ICP-MS zircon U-Th-Pb age data from volcanic rocks in Deren Formation
点号 Pb/10-6 Th/10-6 U/10-6 Th/U 同位素比值 同位素年龄值/Ma 207Pb/206Pb 1σ 207Pb/235U 1σ 206Pb/238U 1σ 207Pb/206Pb 1σ 207Pb/235U 1σ 206Pb/238U 1σ RZ30(英安质角砾晶屑岩屑凝灰岩)，206Pb/206U年龄加权平均值为246.8±3.5Ma(MSWD=2.9，n=12)和169.6±4.6Ma(MSWD=1.2, n=4) 1 63.0 697 1300 0.54 0.0534 0.0014 0.2897 0.0082 0.0396 0.0006 346 92 258 6 250 4 2 85.3 1124 1802 0.62 0.0540 0.0015 0.2847 0.0083 0.0384 0.0006 372 61 254 7 243 4 3 106 1606 1966 0.82 0.0505 0.0010 0.2819 0.0060 0.0406 0.0005 220 46 252 5 256 3 4 106 1639 2141 0.77 0.0518 0.0009 0.2717 0.0053 0.0381 0.0005 276 44 244 4 241 3 5 23.0 257 725 0.35 0.0465 0.0022 0.1702 0.0081 0.0268 0.0004 33 98 160 7 171 2 7 98.0 1023 2121 0.48 0.0518 0.0013 0.2698 0.0065 0.0379 0.0004 276 57 243 5 240 3 8 115 2162 2041 1.06 0.0538 0.0012 0.2879 0.0067 0.0391 0.0005 361 52 257 5 247 3 9 151 2158 2963 0.73 0.0526 0.0009 0.2825 0.0055 0.0390 0.0005 309 37 253 4 247 3 10 60.5 660 1260 0.52 0.0500 0.0013 0.2673 0.0076 0.0388 0.0005 195 27 240 6 245 3 11 56.8 742 1093 0.68 0.0544 0.0016 0.2988 0.0083 0.0403 0.0006 391 67 265 7 255 4 13 132 1974 2575 0.77 0.0535 0.0011 0.2919 0.0074 0.0394 0.0004 350 50 260 6 249 3 14 145 2947 2715 1.09 0.0510 0.0011 0.2746 0.0064 0.0390 0.0004 243 55 246 5 247 3 17 27.9 740 791 0.93 0.0525 0.0022 0.1871 0.0077 0.0263 0.0004 306 129 174 7 168 3 18 26.8 462 800 0.58 0.0523 0.0025 0.1946 0.0090 0.0272 0.0004 298 142 181 8 173 3 19 101 2021 1932 1.05 0.0546 0.0013 0.2844 0.0066 0.0380 0.0003 394 58 254 5 240 2 20 26.3 410 829 0.49 0.0561 0.0023 0.1985 0.0073 0.0262 0.0004 457 91 184 6 167 3 RZ33(流纹岩)，206Pb/238U年龄加权平均值为117.0±0.9Ma(MSWD=0.86, n=15) 1 40.7 1317 1813 0.73 0.0494 0.0018 0.1224 0.0048 0.0182 0.0004 169 85 117 4 116 2 2 19.7 899 766 1.17 0.0539 0.0031 0.1303 0.0066 0.0180 0.0004 369 131 124 6 115 2 3 21.9 926 875 1.06 0.0467 0.0024 0.1135 0.0056 0.0180 0.0003 32 119 109 5 115 2 4 61.9 1784 2628 0.68 0.0488 0.0015 0.1252 0.0038 0.0186 0.0002 139 72 120 3 119 1 8 51.0 2127 2087 1.02 0.0461 0.0015 0.1160 0.0041 0.0182 0.0003 400 -324 111 4 117 2 10 43.0 1574 1744 0.90 0.0544 0.0018 0.1378 0.0047 0.0184 0.0002 387 69 131 4 117 2 11 17.0 456 700 0.65 0.0679 0.0038 0.1706 0.0095 0.0185 0.0004 865 117 160 8 118 2 12 88.5 2421 3759 0.64 0.0506 0.0012 0.1288 0.0033 0.0184 0.0002 233 56 123 3 117 1 13 40.2 1330 1675 0.79 0.0499 0.0016 0.1231 0.0039 0.0179 0.0002 191 71 118 4 115 1 14 34.7 1104 1467 0.75 0.0542 0.0018 0.1346 0.0045 0.0182 0.0003 389 74 128 4 116 2 15 30.4 926 1246 0.74 0.0504 0.0022 0.1296 0.0059 0.0187 0.0003 213 102 124 5 119 2 16 34.1 914 1486 0.62 0.0504 0.0021 0.1256 0.0050 0.0182 0.0002 213 92 120 4 117 2 18 53.9 1620 2237 0.72 0.0484 0.0015 0.1229 0.0040 0.0184 0.0002 120 74 118 4 118 2 19 16.1 524 670 0.78 0.0541 0.0027 0.1325 0.0064 0.0183 0.0004 376 111 126 6 117 2 20 53.5 1548 2254 0.69 0.0564 0.0019 0.1402 0.0044 0.0182 0.0002 478 72 133 4 116 2
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