ZirconU-Pb age and geochemical characteristics of the rhyolite of the Yudaokou basin in Weichang, Hebei Province, and their geological implications
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摘要:
对河北省围场县御道口盆地流纹岩进行SHRIMP锆石U-Pb定年，结果表明，盆地内流纹岩的锆石206Pb/238U年龄加权平均值为155.2±2.0Ma，属于晚侏罗世早期岩浆活动的产物，与辽源地块新民组和燕山陆內造山带髫髻山组的地质时代一致。流纹岩分为灰白色流纹岩和肉红色流纹岩2种，均具有较高的SiO2、K2O、Al2O3含量和低的CaO、MgO含量，属高钾钙碱性系列，肉红色流纹岩的K2O/Na2O和Fe2O3/FeO值略高于灰白色流纹岩。流纹岩的稀土元素总量较高，轻、重稀土元素分馏明显，负Eu异常明显，具右倾轻稀土元素富集型稀土元素配分曲线特征；富集大离子亲石元素Rb、Th、U、Ga、Y和高场强元素Zr、Hf、Nb、Ta，亏损大离子亲石元素Ba、Sr，具有A2型花岗岩和低Sr-Ba流纹岩的微量元素特征，具有较高的（87Sr/86Sr）i值（0.708606~0.711171）、较低的εNd（t）值（-9.78~-7.11）、相对年轻的TDM2（1520~1737Ma）和较低的（206Pb/204Pb）t、（207Pb/204Pb）t、（208Pb/204Pb）t值，在εNd（t）-（87Sr/86Sr）i图解上投影点位于下地壳和亏损地幔之间，在（207Pb/204Pb）t-（206Pb/204Pb）t和（208Pb/204Pb）t-（206Pb/204Pb）t图解上投影点位于下地壳和地幔之间，指示流纹岩可能是DMM型（亏损型）地幔岩浆、EMⅠ富集地幔岩浆和少量古老下地壳物质混合形成的年轻下地壳部分熔融的产物。御道口盆地流纹岩的锶-钕-铅同位素特征与内蒙古基底隆起带的长英质火山-侵入岩基本一致，也与燕山陆內造山带的长英质火山-侵入岩相似，但不同于辽源地块的长英质火山-侵入岩。
Abstract:The SHRIMP U-Pb dating of zircon yielded a 206Pb/238U age of 155.2±2.0Ma for rhyolites in Yudaokou basin, located in Weichang County, northern Hebei Province, indicating that its geological age is early Late Jurassic, consistent with that of Xinmin Formation of Liaoyuan Block and Tiaojishan Formation of the Yanshan intracontinental orogenic belt. The rhyolites can be divided into gray and pinkish red colors, and both are characterized by typical enrichment of SiO2, K2O and Al2O3, low content of CaO and MgO, thus belonging to high-K calc-alkaline series rocks. Only the ratios of K2O/Na2O and Fe2O3/FeO of cinnamon rhyolite are slightly higher than the values of the gray one. Furthermore, the rhyolites exhibit high content of ∑REE, obvious fractionation of LREE and HREE, and strong negative Eu anomaly, possessing features of enrichment of LREE. These rocks are characterized by enrichment of LILE such as Rb, Th, U, Ga and Y, but depletion of Ba and Sr. In addition, HFSE, such as Zr, Hf, Nb and Ta are enriched as well. All of the samples show the trace element characteristics of A2-type granite and low Sr-Ba rhyolite, sharing the features of relatively high (87Sr/86Sr)i values (0.708606~0.711171), low εNd(t) values (-9.78~-7.11), and young TDM2 (1520~1737Ma), lower (206Pb/204Pb)t (16.93~17.06), (207Pb/204Pb)t (15.37~15.43) and (208Pb/204Pb)t (37.30~37.72). The projection points are located between the lower crust and the depleted mantle in the diagram of εNd(t)-(87Sr/86Sr)i, and between the lower crust and mantle in the diagram of (207Pb/204Pb)t-(206Pb/204Pb)t and (208Pb/204Pb)t-(206Pb/204Pb)t, indicating that the rhyolite in the Yudaokou basin was probably formed by partial melting of young lower crust material which originated from DMM mantle, EMI enriched mantle magma and old lower crustal material. The source material was different from felsic volcanic-intrusive rocks in Liaoyuan Block, but similar to felsic volcanic-intrusive rocks in the Yanshan intracontinental orogenic belt.
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Key words:
- rhyolite /
- geochronology /
- geochemistry /
- early Late Jurassic /
- geological implications /
- Yudaokou basin
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图 10 御道口盆地流纹岩206Pb/204Pb-207Pb/204Pb（a，底图据参考文献[71]）和206Pb/204Pb-208Pb/204Pb（b）图解
Figure 10.
表 1 御道口盆地流纹岩（YDK001）SHRIMP锆石U-Th-Pb同位素分析结果
Table 1. Analytical result of SHRIMP zircons U-Th-Pb of the rhyolite (YDK001) from the Yudaokou basin
测定点编号 206Pbc/% U/10-6 Th/10-6 232Th/238U 206pb*/10-6 206Pb/238U年龄/Ma 207Pb*/235U ±% 206Pb*/238U ±% 误差相关系数 1.1 -- 228 225 1.02 5.18 168.8±2.3 0.190 3.7 0.02654 1.4 0.375 2.1 0.31 76 45 0.61 1.60 155.5±3.0 0.176 14 0.02441 2.0 0.141 3.1 1.44 61 34 0.58 1.28 153.0±2.9 0.143 10 0.02401 1.9 0.190 4.1 0.36 73 43 0.61 1.57 158.6±4.0 0.173 20 0.02490 2.5 0.129 5.1 5.65 51 29 0.59 1.11 154.2±5.0 0.02421 3.3 6.1 1.42 63 43 0.71 1.32 153.3±4.8 0.146 29 0.02406 3.2 0.110 7.1 6.18 68 45 0.67 1.49 151.7±3.8 0.02382 2.6 8.1 -- 45 27 0.62 0.96 159.2±3.2 0.187 7.8 0.02500 2.1 0.265 9.1 1.32 79 62 0.81 1.65 152.8±3.3 0.125 29 0.02399 2.2 0.075 10.1 0.00 59 33 0.58 1.30 162.3±4.1 0.163 5.8 0.02549 2.6 0.443 11.1 1.26 78 53 0.70 1.63 152.7±6.8 0.183 24 0.0240 4.5 0.187 12.1 1.95 54 34 0.65 1.18 158.0±3.1 0.120 13 0.02481 2.0 0.156 13.1 1.12 56 36 0.67 1.17 153.9±4.1 0.138 34 0.02416 2.7 0.078 14.1 0.85 76 43 0.59 1.58 153.2±3.5 0.145 26 0.02404 2.3 0.088 15.1 -- 43 25 0.60 0.90 157.1±3.2 0.178 6.2 0.02468 2.1 0.335 16.1 0.96 55 33 0.61 1.18 156.2±3.0 0.153 9.1 0.02453 2.0 0.214 注：206Pb*为放射性成因铅；206Pbc为普通铅206Pb占总206Pb的百分比；普通铅根据实测204Pb进行校正；误差为1σ 
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表 2 御道口盆地流纹岩主量、微量和稀土元素分析结果及有关参数
Table 2. Analysis result of major, trace and rare earth element of the rhyolites from Yudaokou basin
岩性 肉红色流纹岩 灰白色流纹岩 样号 YDK001 YDK002 YDK003 YDK101 YDK102 YDK104 YDK105 YDK106 YDK107 SiO2 69.2 72.0 70.5 73.6 72.5 73.0 74.2 70.5 69.9 TiO2 0.44 0.42 0.41 0.18 0.19 0.21 0.19 0.16 0.15 Al2O3 16.5 15.1 15.1 12.8 13.2 13.8 12.9 14.7 14.3 MgO 0.26 0.26 0.25 0.15 0.11 0.11 0.09 0.11 0.10 MnO 0.12 0.04 0.04 0.06 0.06 0.06 0.06 0.08 0.09 Fe2O3 1.54 2.02 1.76 2.45 1.79 0.99 0.57 0.72 0.76 FeO 1.88 1.02 1.85 0.78 1.77 1.87 2.03 2.65 2.95 CaO 0.16 0.17 0.38 0.42 0.48 0.43 0.42 0.44 0.60 Na2O 1.81 1.09 0.91 1.62 1.59 1.55 2.64 1.89 2.15 K2O 6.55 6.89 7.24 6.48 6.23 5.67 5.07 6.07 6.11 P2O5 0.07 0.08 0.07 0.02 0.01 0.02 0.01 0.01 0.01 烧失量 1.44 1.10 1.58 1.44 2.08 2.17 1.88 2.32 2.70 总量 100 100 100 99.9 100 99.9 100 99.7 99.8 K2O+Na2O 8.36 7.98 8.15 8.10 7.82 7.22 7.71 7.96 8.26 K2O/Na2O 3.62 6.31 7.96 4.00 3.92 3.66 1.92 3.21 2.84 Fe2O3+FeO 3.42 3.04 3.61 3.23 3.56 2.86 2.60 3.37 3.71 Fe2O3/FeO 0.82 1.98 0.95 3.14 1.01 0.53 0.28 0.27 0.26 A/CNK 1.59 1.57 1.50 1.22 1.28 1.46 1.21 1.40 1.27 La 78.6 77.8 70.3 123 134 116 118 112 100 Ce 152 154 148 232 246 132 151 166 196 Pr 17.6 17.2 15.6 27.4 30.0 24.9 25.7 24.6 21.9 Nd 61.6 60.5 54.5 99.2 107.8 87.7 90.7 88.0 77.9 Sm 10.8 10.3 9.35 17.0 18.2 14.8 15.6 14.9 13.2 Eu 1.61 1.42 1.29 0.16 0.14 0.11 0.11 0.11 0.10 Gd 9.01 8.99 8.59 14.5 15.9 13.1 14.0 12.9 11.9 Tb 1.47 1.46 1.38 2.29 2.66 2.13 2.42 2.09 2.04 Dy 8.96 8.63 8.21 13.3 16.6 13.2 16.1 12.1 13.2 Ho 1.80 1.73 1.65 2.57 3.48 2.76 3.40 2.38 2.68 Er 5.33 5.10 4.86 7.27 10.3 8.49 10.4 6.69 8.14 Tm 0.90 0.81 0.80 1.19 1.76 1.42 1.75 1.09 1.33 Yb 6.46 5.60 5.42 7.87 11.51 9.20 11.12 7.20 8.81 Lu 0.97 0.83 0.82 1.14 1.63 1.30 1.59 1.06 1.28 ΣREE 357 354 331 549 600 427 462 452 458 ΣLREE 323 321 299 499 536 375 401 406 409 ΣHREE 34.9 33.2 31.7 50.1 63.9 51.5 60.8 45.5 49.3 ΣL/ΣH 9.24 9.68 9.43 9.96 8.40 7.28 6.60 8.93 8.30 (La/Yb)N 8.22 9.40 8.76 10.6 7.86 8.50 7.17 10.5 7.70 (La/Sm)N 4.60 4.77 4.73 4.57 4.64 4.93 4.75 4.75 4.77 (Gd/Yb)N 1.13 1.30 1.28 1.50 1.12 1.15 1.02 1.45 1.09 δEu 0.49 0.44 0.43 0.03 0.02 0.02 0.02 0.02 0.02 Rb 235 254 229 378 353 220 254 354 306 Sr 118 105 125 33.6 33.8 45.2 32.2 37.4 30.8 Ba 478 406 487 58.6 62.3 30.0 19.4 43.0 28.2 Th 17.2 17.4 17.2 28.7 32.2 27.7 26.0 28.8 24.0 U 4.40 2.94 2.63 4.13 5.75 5.61 4.81 6.09 4.61 Zr 653 681 597 650 720 757 744 769 735 Hf 19.2 20.9 16.2 24.6 25.1 24.0 24.9 23.3 23.5 Nb 31.7 35.0 31.3 42.4 42.9 46.3 44.0 40.3 37.7 Ta 2.25 2.44 2.16 3.00 3.08 3.14 2.85 2.87 2.65 Y 45.6 45.5 41.9 64.6 92.2 71.4 91.7 61.4 71.5 V 7.67 5.53 7.64 0.69 0.57 0.59 0.56 0.51 0.36 Ga 27.1 28.0 27.4 33.3 34.8 34.5 35.4 41.5 38.3 Rb/Sr 2.00 2.42 1.84 11.3 10.5 4.87 7.89 9.46 9.91 Ti/Zr 4.10 3.73 4.18 1.68 1.62 1.70 1.56 1.28 1.26 Ti/Y 58.7 55.7 59.6 16.9 12.6 18.0 12.7 16.0 12.9 Zr+Nb+Ce+Y 882 915 819 989 1101 1006 1031 1037 1040 104Ga/Al 3.09 3.50 3.42 4.93 4.99 4.71 5.19 5.32 5.07 TZr/℃ 970 977 956 948 965 985 964 980 962 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 御道口盆地流纹岩锶-钕-铅-氧同位素分析结果及有关参数
Table 3. Sr-Nd-Pb-O isotopic compositions of the rhyolite from Yudaokou basin
元素 肉红色流纹岩 灰白色流纹岩 YDK001 YDK002 YDK003 YDK105 YDK107 Rb/10-6 235 254 229 254 306 Sr/10-6 118 105 125 32.2 30.8 87Rb/86Sr 5.64 6.82 5.19 22.3 28.0 (87Sr/86Sr)s 0.721404 0.723629 0.722611 0.757936 0.771323 2σ 0.000012 0.000013 0.000011 0.000014 0.000012 (87Sr/86Sr)i 0.708967 0.708606 0.711171 0.708862 0.709631 Sm/10-6 10.8 10.3 10.4 15.6 13.2 Nd/10-6 61.6 60.5 54.5 90.7 77.9 147Sm/144Nd 0.110197 0.107278 0.119975 0.108911 0.107462 (143Nd/144Nd)s 0.512122 0.512183 0.512165 0.512052 0.512046 2σ 0.000014 0.000011 0.000015 0.000011 0.000009 (143Nd/144Nd)i 0.512010 0.512074 0.512043 0.511942 0.511937 εNd(t) -8.36 -7.11 -7.71 -9.70 -9.78 ƒSm/Nd -0.44 -0.46 -0.39 -0.45 -0.46 TDM2/Ma 1621 1520 1569 1730 1737 U/10-6 4.401 2.944 2.631 4.813 4.613 Th/10-6 17.19 17.43 17.23 25.98 23.95 Pb/10-6 34.62 28.24 23.71 28.89 38.42 (206Pb/204Pb)s 17.155 17.175 17.229 17.178 17.127 2σ 0.010 0.008 0.014 0.018 0.011 (207Pb/204Pb)s 15.383 15.369 15.436 15.432 15.424 2σ 0.014 0.008 0.020 0.023 0.013 (208Pb/204Pb)s 37.566 37.600 37.844 38.168 38.002 2σ 0.011 0.007 0.014 0.028 0.016 (206pb广4pb)t 16.96 17.02 17.06 16.93 16.95 (207Pb/204Pb)t 15.38 15.37 15.43 15.43 15.42 (208Pb/204Pb)t 37.32 37.30 37.49 37.72 37.70 δ18OV-SMOW‰ 7.7 7.4 9.5 9.0 6.5 注：锶、钕、铅同位素比值年龄校正时采用本文获得的流纹岩SHRIMP锆石U-Pb年龄155Ma，计算公式见参考文献[10]
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表 4 华北陆块北缘断裂带两侧晚侏罗世—早白垩世早期火山岩锆石U-Pb年龄
Table 4. Zircon U-Pb ages of the Late Jurassic-early Early Cretaceous volcanic rocks from both sides of the fault zone on the northern margin of the North China Block
地点 岩石地层单位 岩性 分析方法 年龄/Ma 资料来源 辽源地块 克旗红山子 新民组 流纹岩 SHRIMP 156.5±1.6 [8] 流纹岩 154.7±1.7 流纹岩 156.5±1.4 克旗芝瑞克旗万合永克旗托河 流纹岩 156.9±1.7 [13] 流纹岩 159.6±1.5 [16] 流纹岩 159.6±1.5 [19] 内蒙古基底隆起带 围场御道口 流纹岩 155.2±2.0 本文 围场多本沟 流纹岩 156.6±1.8 [15] 沽源 张家口组 粗面岩 138.4±1.3 [11] 粗面岩 139.5±1.3 [11] 流纹岩 138.6±1.4 [9] 丰宁 流纹岩 140.2±1.9 [33] 粗面岩 140.3±1.4 [14] 张家口 英安岩 LA-ICP-MS 139.6±2.6 [50] 英安岩 136.1±1.4 英安岩 143.0±3.7 英安岩 138.9±2.7 燕山板内造山带 滦平 张家口组 玄武安山岩 LA-ICP-MS 130.2±3.0 [51] 玄武安山岩 131.4±3.7 流纹岩 135.2±2.3 [52] 凝灰岩 135.7±1.8 流纹岩 SHRIMP 135.4±1.6 [53] 流纹岩 136.3±3.4 熔结凝灰岩 135.4±1.6 [54] 凝灰岩 133.9±2.5 沉凝灰岩 130.1±2.5 凌源 英安岩 LA-ICP-MS 132.4±1.4 [55] 角砾熔岩 130.2±1.5 酸性凝灰岩 129.6±0.9 酸性凝灰岩 129.4±0.8 英安岩 129.1±1.7 流纹岩 131.7±1.7 滦平 髫髻山组 安山岩 LA-ICP-MS 162.8±3.2 [52] 安山岩 153.8±5.0 [50] 承德 粗安岩 155.5±2.9 [56] 岩屑凝灰岩 152.5±0.9 流纹岩 164.4±2.7 [50] 玻屑凝灰岩 SHRIMP 151.5±3.4 [57] 凝灰岩 153.3±3.3 安山岩 153.6±3.8 [58] 北京西山 安山岩 157.0±3.0 [59] 北票 蓝旗组 流纹岩 160.0±6.0 [60] 安山玢岩 153.0±2.0 安山玢岩 153.5±1.2 [61] 凝灰岩 157.2±3.8 流纹英安岩 LA-ICP-MS 154.0±4.7 [50] 朝阳 安山岩 161.8±2.1 凌源 英安岩 157.1±2.4 [52] 英安岩 156.9±3.0 [50] 安山质熔岩 159.4±3.6 [62] 凝灰岩 158.0±1.0 [59] 安山质角砾岩 SHRIMP 158.0±1.0 [59] 宁城 粗安岩 152.6±2.6 [54] 石英粗安岩 163.8±2.6 粗面质凝灰岩 164.6±2.0 [57] 粗安岩 164.6±2.4 [63] 凝灰岩 165.0±1.2 [60]
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