Genesis and tectonic significance of the Early Cretaceous intermediate volcanic rocks in Chaihe-Moguqi area, central Da Hinggan Mountains
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摘要:
大兴安岭中部柴河—蘑菇气地区早白垩世中性火山岩岩相学研究表明，其主要岩石组合为安山岩、英安岩、安山质晶屑凝灰熔岩、凝灰角砾熔岩等，LA-ICP-MS锆石U-Pb测年结果显示其形成于140~130Ma之间。岩石主量元素具有富钾钠、富铝，贫镁的特点，属高钾钙碱性岩石。相对富集轻稀土元素、亏损重稀土元素，无明显的Eu异常，微量元素主要富集大离子亲石元素（如Rb、K、LREE）和Ba、Sr元素，亏损高场强元素（Ta、Nb、P、Ti）。地球化学特征指示，这些早白垩世中性火山岩来源于新元古代和古生代期间新增生的下地壳玄武质岩石的部分熔融，并可能受到早先俯冲事件带来的流体的影响，形成于蒙古-鄂霍茨克洋闭合陆壳加厚之后的岩石圈伸展环境。
Abstract:In this paper, the authors studied the Early Cretaceous intermediate volcanic rocks in Chaihe-Moguqi area, central Da Hinggan Mountains. The intermediate volcanic rocks consist of andesite, dacite, intermediate lava and tuff, formed from ~140 to ~130Ma. Chemical analyses show that the intermediate volcanic rocks are classified as high-K calcalkaline volcanic rocks, and are characterized by enrichment of light rare earth elements (LREEs), large ion lithophile elements (LILEs), Ba, Sr, and depletion of heavy rare earth elements (HREEs), high field strength elements (HFSEs), with no distinct Eu anomalies. All the geochemical characteristics suggest that the Early Cretaceous intermediate volcanic rocks were derived from the partial melting of a juvenile lower crustal basaltic rocks, and might have been affected by the fluid caused by earlier subduction event. The authors hold that the generation of the Early Cretaceous intermediate volcanic rocks was related to the lithospheric extensional setting after the final closure of the Mongol-Okhotsk Ocean and subsequent continental thickening.
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表 1 研究区早白垩世中性火山岩测年结果
Table 1. Data of zircons for the Early Cretaceous intermediate volcanic rocks in study area
样品号 岩性 年龄/Ma 采样位置 方法 数据来源 Z11-84 安山质角砾凝灰熔岩 139±1 碾子山北 LA-ICP-MS A P010-5-2 英安岩 141±5 苏河屯 LA-ICP-MS B P9B2-2 安山岩 137±2 青年林场北山 SHRIMP C P11B11-3 角闪玄武安山岩 131±3 河中林场 SHRIMP C TW1 安山岩 133±7 哈布气林场 Rb-Sr D DH2011RZ27 安山岩 141±2 新立屯 LA-ICP-MS E 注：A—本文数据；B—吉林省区域地质矿产调查所提供数据；C—吉林大学刘正宏教授提供数据；D—辽宁省地质矿产调查院提供数据；E—中国地质调查局沈阳地质调查中心提供数据；Z11-84采样点坐标为北纬47°39′51″、东经122°51′34″ 
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表 2 早白垩世中性火山岩测年数据
Table 2. Age statistics for the Early Cretaceous intermediate volcanic rocks
分析号 Th/10-6 U/10-6 Th/U 同位素比值 年龄/Ma 206Pb/238U 1σ 207Pb/235U 1σ 207Pb/206Pb 1σ 206Pb/238U 1σ 207Pb/235U 1σ 207Pb/206Pb 1σ Z11-84.1 26 33 0.80 0.021 0.0005 0.1767 0.0176 0.0608 0.0053 134 3 165 16 875 447 Z11-84.2 46 42 1.10 0.0222 0.0004 0.1950 0.0161 0.0639 0.0047 141 2 181 15 1120 343 Z11-84.4 27 39 0.69 0.0213 0.0006 0.1506 0.0182 0.0513 0.0033 136 4 142 17 146 598 Z11-84.5 28 33 0.86 0.0217 0.0005 0.1719 0.0189 0.0574 0.0049 138 3 161 18 852 497 Z11-84.6 20 26 0.78 0.0211 0.0006 0.1571 0.0197 0.0539 0.0069 135 4 148 19 181 625 Z11-84.7 41 42 0.98 0.0216 0.0004 0.2040 0.0114 0.0685 0.0048 138 3 189 11 1662 207 Z11-84.8 40 47 0.86 0.0219 0.0003 0.1742 0.0126 0.0576 0.0045 140 2 163 12 514 316 Z11-84.9 33 43 0.78 0.0218 0.0003 0.1635 0.0125 0.0544 0.0042 139 2 154 12 755 322 Z11-84.10 23 31 0.75 0.0219 0.0004 0.1714 0.0103 0.0567 0.0037 140 3 161 10 1997 220 Z11-84.11 27 39 0.70 0.0218 0.0004 0.1474 0.0158 0.0490 0.0049 139 3 140 15 147 587 Z11-84.12 27 32 0.83 0.0216 0.0005 0.2013 0.0115 0.0677 0.0058 138 3 186 11 2164 196 Z11-84.13 40 50 0.79 0.0220 0.0003 0.1660 0.0099 0.0547 0.0030 140 2 156 9 1222 233 Z11-84.14 27 36 0.75 0.0222 0.0004 0.1502 0.0176 0.0491 0.0039 142 2 142 17 152 565 Z11-84.15 25 33 0.76 0.0217 0.0005 0.1671 0.0096 0.0558 0.0055 138 3 157 9 1787 208 Z11-84.16 43 55 0.79 0.0215 0.0005 0.1815 0.0101 0.0611 0.0039 137 3 169 9 2076 194 Z11-84.17 29 41 0.72 0.0219 0.0003 0.1750 0.0125 0.0579 0.0045 140 2 164 12 1447 281 Z11-84.18 48 54 0.87 0.0220 0.0003 0.1899 0.0096 0.0625 0.0042 140 2 177 9 1329 199 Z11-84.19 24 33 0.72 0.0219 0.0005 0.2673 0.0231 0.0887 0.0097 139 3 241 21 1398 365 Z11-84.20 30 39 0.76 0.0215 0.0004 0.1525 0.0147 0.0514 0.0063 137 2 144 14 152 887 Z11-84.21 28 36 0.77 0.0201 0.0008 0.1849 0.0132 0.0668 0.0063 128 5 172 12 1677 271 Z11-84.22 29 40 0.71 0.0220 0.0007 0.1902 0.0174 0.0627 0.0074 140 4 177 16 697 377 Z11-84.23 27 37 0.74 0.0220 0.0004 0.1838 0.0157 0.0607 0.0049 140 3 171 15 1502 339 Z11-84.24 35 53 0.65 0.0220 0.0003 0.1636 0.0087 0.0539 0.0036 140 2 154 8 1034 216 Z11-84.25 42 55 0.77 0.0217 0.0002 0.1806 0.0080 0.0602 0.0025 139 2 169 7 1203 177
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表 3 早白垩世中性火山岩主量、微量和稀土元素分析结果
Table 3. Major, trace and rare earth elements analyses of the Early Cretaceous intermediate volcanic rocks
样品号 B1068-1 B2005-2 B2010-1 B2022-1 B2034-1 B2082-2-1 B3007-1 B4063-1 B5049-3 HfP38-2-1 SiO2 58.40 55.40 62.30 68.40 60.90 63.80 69.10 67.00 55.10 60.42 T1O2 0.98 1.68 0.44 0.39 0.76 0.66 0.55 0.58 1.09 0.91 Al2O3 16.90 15.70 15.30 15.70 16.35 16.60 14.80 15.10 16.90 18.00 Fe2O3 3.62 6.65 2.36 1.78 2.29 3.41 2.47 1.99 3.46 2.90 FeO 3.52 1.85 1.20 1.02 2.95 1.12 0.62 2.02 4.70 1.52 MnO 0.10 0.11 0.07 0.04 0.10 0.07 0.06 0.08 0.13 0.11 MgO 2.67 3.15 1.67 0.45 1.96 1.40 0.45 1.38 3.74 1.74 CaO 5.28 6.57 4.06 2.08 5.06 2.74 1.16 2.29 5.78 3.81 Na2O 4.27 3.25 1.73 4.56 3.05 4.50 3.99 3.75 3.37 4.72 K2O 1.66 2.12 3.01 3.80 3.01 3.58 4.84 4.43 2.74 3.36 P2O5 0.27 0.91 0.12 0.08 0.24 0.23 0.12 0.17 0.37 0.37 烧失量 1.78 2.14 7.36 1.09 2.67 1.47 1.29 0.64 1.82 1.94 总计 99.45 99.53 99.62 99.40 99.34 99.58 99.45 99.43 99.20 99.80 σ 2.28 2.33 1.16 2.75 2.05 3.14 2.99 2.79 3.09 3.75 A/CNK 0.92 0.80 1.13 1.02 0.93 1.02 1.06 1.00 0.89 0.98 Na2O+K2O 5.93 5.37 4.74 8.36 6.06 8.08 8.83 8.18 6.11 8.08 Cr 30.20 70.60 17.80 15.90 20.60 16.50 14.20 24.50 30.00 3.21 Rb 24.8 32.4 100 94.9 64.1 86.1 115 76.4 39.4 101.4 Sr 563 807 1480 388 668 571 491 400 671 664.4 Ba 659 953 1190 1020 1020 979 1180 782 664 1065 Th 4.14 3.48 6.02 6.75 4.84 7.32 6.58 8.26 3.6 9.69 U 1.04 0.98 1.39 1.49 1.19 1.95 1.91 2.06 1.18 2.49 Nb 6.76 17.2 6.81 7.34 6.34 9.18 9.25 9.42 6.78 7.69 Ta 0.5 1.1 0.4 0.4 0.41 0.54 0.47 0.64 0.36 0.53 Zr 224 405 235 290 190 247 271 210 158 194.8 Hf 5.89 9.71 6.38 7.91 5.04 6.6 7.24 6.04 4.38 14.91 La 24.2 60.4 26.2 26.3 24.1 32.6 30.6 27.8 19.3 32.62 Ce 50 131 51.7 53.1 48.3 67.6 60.5 55.9 40 62.37 Pr 6.99 16.8 6.6 6.1 5.96 8.1 8 7.21 5.98 7.19 Nd 29.4 68.3 24.5 23.3 23 31.1 32.4 27.3 25.7 29.78 Sm 6.01 12.2 4.44 4.11 4.22 5.51 6.09 4.98 5.4 5.75 Eu 1.59 2.77 1.22 1.21 1.32 1.48 1.56 1.1 1.52 1.96 Gd 4.84 9.27 3.63 3.32 3.62 4.43 4.79 4.08 4.43 4.15 Tb 0.71 1.44 0.56 0.55 0.56 0.67 0.8 0.69 0.78 0.73 Dy 4.15 6.74 3.04 3.03 2.9 3.72 4.76 3.79 4.13 3.67 Ho 0.82 1.19 0.61 0.61 0.56 0.72 0.93 0.72 0.78 0.73 Er 2.31 3.24 1.74 1.78 1.64 2.01 2.66 2 2.28 1.92 Tm 0.35 0.44 0.27 0.28 0.25 0.32 0.4 0.31 0.33 0.3 Yb 2.28 2.76 1.89 1.97 1.62 2.15 2.83 2.06 2.13 2.2 Lu 0.35 0.42 0.31 0.31 0.26 0.34 0.44 0.32 0.32 0.27 Y 22.2 31 16.8 16.6 15.4 20.2 24.9 18.8 21.6 20.3 ∑REE 156.20 347.97 143.51 142.57 133.71 180.95 181.66 157.06 134.68 173.93 LR/HR 7.48 11.43 9.52 9.63 9.37 10.19 7.90 8.90 6.45 9.99 δEu 0.87 0.77 0.90 0.97 1.01 0.89 0.85 0.72 0.92 1.17 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 4 早白垩世中性火山岩锆石原位Hf同位素分析结果
Table 4. In situ zircon Hf isotopic compositions of the Early Cretaceous intermediate volcanic rocks
分析点 年龄/Ma 176Yb/l77Hf 2σ 176Lu/177Hf 2σ 176Hf/177Hf 2σ 176Hf/177Hf (corr) 2σ εHf(0) εHf(t) 2σ TDM1(Hf)/Ma TDM2(Hf)/Ma fLu/Hf Z11-84.1 134 0.0300 0.0000 0.0008 0.0000 0.282977 0.000019 0.282981 0.000019 7.4 10.26 0.7 382 482 -0.98 Z11-84.2 141 0.0430 0.0001 0.0011 0.0000 0.282859 0.000025 0.282863 0.000025 3.2 6.21 0.9 553 714 -0.97 Z11-84.4 136 0.0446 0.0001 0.0012 0.0000 0.282941 0.000023 0.282944 0.000023 6.1 8.96 0.8 439 556 -0.96 Z11-84.5 138 0.0347 0.0003 0.0010 0.0000 0.282971 0.000024 0.282975 0.000024 7.2 10.12 0.9 393 493 -0.97 Z11-84.6 135 0.0359 0.0001 0.0011 0.0000 0.282975 0.000019 0.282979 0.000019 7.3 10.18 0.7 388 487 -0.97 Z11-84.7 138 0.0458 0.0001 0.0015 0.0000 0.282979 0.000025 0.282983 0.000025 7.5 10.35 0.9 386 479 -0.96 Z11-84.8 140 0.0249 0.0001 0.0007 0.0000 0.282949 0.000023 0.282953 0.000023 6.4 9.40 0.8 421 534 -0.98 Z11-84.9 139 0.0204 0.0000 0.0006 0.0000 0.282965 0.000020 0.282968 0.000020 6.9 9.93 0.7 398 504 -0.98 Z11-84.10 140 0.0224 0.0000 0.0007 0.0000 0.282954 0.000020 0.282958 0.000020 6.6 9.57 0.7 414 525 -0.98 Z11-84.11 139 0.0447 0.0002 0.0012 0.0000 0.282904 0.000023 0.282907 0.000023 4.8 7.73 0.8 492 628 -0.96 Z11-84.12 138 0.0301 0.0001 0.0008 0.0000 0.282932 0.000025 0.282936 0.000025 5.8 8.73 0.9 446 570 -0.98 Z11-84.14 142 0.0297 0.0002 0.0008 0.0000 0.282883 0.000025 0.282886 0.000025 4.0 7.08 0.9 515 666 -0.98 Z11-84.15 138 0.0318 0.0001 0.0008 0.0000 0.282917 0.000032 0.282921 0.000032 5.3 8.23 1.1 467 599 -0.97 Z11-84.16 137 0.0301 0.0001 0.0008 0.0000 0.282994 0.000025 0.282997 0.000025 8.0 10.91 0.9 359 448 -0.98 Z11-84.17 140 0.0411 0.0001 0.0011 0.0000 0.282963 0.000023 0.282967 0.000023 6.9 9.84 0.8 406 510 -0.97 Z11-84.18 140 0.0367 0.0001 0.0010 0.0000 0.282894 0.000030 0.282897 0.000030 4.4 7.42 1.1 503 646 -0.97 Z11-84.19 139 0.0351 0.0001 0.0011 0.0000 0.282991 0.000028 0.282995 0.000028 7.9 10.84 1.0 365 453 -0.97 Z11-84.20 137 0.0341 0.0000 0.0010 0.0000 0.282976 0.000024 0.282980 0.000024 7.4 10.28 0.8 385 483 -0.97 Z11-84.22 140 0.0354 0.0001 0.0010 0.0000 0.282966 0.000028 0.282970 0.000028 7.0 10.00 1.0 399 501 -0.97
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表 5 早白垩世中性火山岩微量元素特征与不同构造环境安山岩对比[37]
Table 5. Trace element characteristics of the Early Cretaceous intermediate volcanic rocks and a comparison with andesites
安山岩类 Nb Y Zr/Y Rb/Sr Ba/Rb Ba/Sr 研究区中性火山岩平均值 8.68 20.78 11.81 0.13 12.22 1.60 安第斯安山岩平均值 10.0 15.0 14.6 0.11 10.0 1.05 大陆岛弧安山岩平均值 9.4 22.0 5.4 0.09 8.2 1.16 大洋岛弧低钾安山岩平均值 0.8 25.0 2.2 0.04 18.5 0.61 大洋岛弧其他安山岩平均值 5.0 20.0 4.7 0.08 13.0 0.73 注：Nb和Y的单位为10-6
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