Zircon U-Pb age and geochemistry of volcanic rocks in Manketouebo Formation from Jalaid Banner, central Da Hinggan Mountains
-
摘要:
对大兴安岭中段扎赉特旗地区满克头鄂博组火山岩进行了锆石U-Pb年龄和地球化学研究。用LA-ICP-MS测得流纹质隐爆角砾岩(TW6)和流纹岩(TW14)中锆石的206Pb/238U年龄分别为157.2±1.2Ma和154.8±1.1Ma,表明火山岩形成于晚侏罗世。岩石地球化学特征表明,火山岩富硅碱、贫钙镁,为过铝质钙碱性系列;(La/Yb)N=20.24~22.68,轻、重稀土元素分馏明显;球粒陨石标准化稀土元素配分模式图呈右倾形式,Eu为正异常;原始地幔标准化蛛网图显示,大离子亲石元素Rb、K相对富集,高场强元素Nb、Ti、P强烈亏损,显示壳源岩浆的特征。综合本区火山岩的特征并结合他人研究成果,认为扎赉特旗地区满克头鄂博组火山岩的形成与蒙古-鄂霍次克洋闭合后伸展作用关系密切。
-
关键词:
- LA-ICP-MS锆石U-Pb年龄 /
- 地球化学 /
- 满克头鄂博组 /
- 大兴安岭中段 /
- 扎赉特旗
Abstract:Chronologic and geochemical studies of volcanic rocks in Manketouebo Formation from Jalaid Banner area are presented in this paper. The zircon U-Pb dating results show that the ages of rhyolitic breccia (TW6) and rhyolite (TW14) are 157.2±1.2Ma (MSWD=0.33, n=22) and 154.8±1.1Ma (MSWD=0.34, n=28) respectively, indicating that the volcanic rocks were formed in Late Jurassic. Geochemical characteristics indicate that the volcanic rocks are rich in silicon and alkali but poor in calcium and magnesium, and belong to peraluminous calc-alkali series. The chondrite-normalized REE patterns indicate that the volcanic rocks are enriched in light rare earth elements with significant fractionation of HREE and LREE ((La/Yb)N=20.24-22.68), and Eu has a positive anomaly. The primitive mantle-normalized trace element spidergram shows that the volcanic rocks contain high LILE(Rb, K) and low HFSE (Nb, Ti, P), suggesting crust magma source. In combination with all the characteristics of the volcanic rocks and other research results, the authors hold that the volcanic rocks in Manketouebo Formation were closely related to the lithosphere extension after the closure of Mongol-Okhotsk Ocean.
-
-
表 1 扎赉特旗地区满克头鄂博组火山岩LA-ICP-MS锆石U-Th-Pb同位素数据
Table 1 LA-ICP-MS zircon U-Th-Pb data of volcanic rocks of Manketouebo Formation in Jalaid Banner area
测试点 含量/10-6 Th/U 207Pb/206Pb 207Pb/235U 206Pb/238U 207Pb/206Pb 207Pb/235U 206Pb/238U Th U Pb 比值 1σ 比值 1σ 比值 1σ 年龄/Ma 误差/Ma 年龄/Ma 误差/Ma 年龄/Ma 误差/Ma WJH-TW6(流纹质隐爆角砾岩)样品206Pb/238U年龄加权平均值为157.2±1.2Ma(MSWD=0.33,n=22) 1 82 175 9 0.47 0.0578 0.0029 0.1992 0.0095 0.0248 0.0006 524 109 184 8 158 4 2 131 287 13 0.46 0.0561 0.0022 0.1873 0.0075 0.0245 0.0005 454 85 174 6 156 3 3 296 437 25 0.68 0.0502 0.0015 0.1718 0.0056 0.0248 0.0005 211 101 161 5 158 3 4 97 116 7 0.83 0.0511 0.0029 0.1676 0.0082 0.0249 0.0006 243 131 157 7 158 4 5 257 584 26 0.44 0.0515 0.0015 0.1773 0.0059 0.0249 0.0005 265 69 166 5 158 3 6 277 163 22 1.69 0.1269 0.0115 0.5274 0.0619 0.0269 0.0008 2057 161 430 41 171 5 7 144 291 13 0.50 0.0504 0.0017 0.1711 0.0059 0.0248 0.0005 213 44 160 5 158 3 8 62 120 6 0.51 0.0500 0.0026 0.1699 0.0093 0.0249 0.0006 198 122 159 8 158 4 9 719 372 44 1.93 0.0482 0.0016 0.1642 0.0054 0.0247 0.0004 109 76 154 5 158 3 10 561 300 34 1.87 0.0517 0.0020 0.1752 0.0070 0.0246 0.0005 272 92 164 6 157 3 11 38 336 193 0.11 0.1566 0.0028 9.8986 0.2293 0.4566 0.0084 2420 31 2425 21 2425 37 12 310 342 36 0.91 0.0567 0.0017 0.2975 0.0096 0.0381 0.0007 480 65 264 8 241 4 13 191 839 27 0.23 0.0498 0.0013 0.1700 0.0047 0.0247 0.0004 183 59 159 4 157 2 14 478 950 44 0.50 0.0486 0.0012 0.1667 0.0046 0.0249 0.0005 128 53 157 4 159 3 15 631 347 40 1.81 0.0541 0.0020 0.1816 0.0069 0.0244 0.0004 376 85 169 6 155 3 16 63 110 5 0.57 0.0524 0.0036 0.1396 0.0078 0.0206 0.0005 306 127 133 7 131 3 17 1013 396 58 2.56 0.0496 0.0017 0.1639 0.0058 0.0240 0.0004 189 78 154 5 153 3 18 314 373 28 0.84 0.0932 0.0051 0.2823 0.0178 0.0216 0.0004 1492 104 253 14 138 2 19 313 445 25 0.70 0.0494 0.0015 0.1677 0.0053 0.0247 0.0004 165 68 157 5 157 3 20 243 428 21 0.57 0.0500 0.0016 0.1713 0.0055 0.0250 0.0004 195 106 161 5 159 3 21 88 210 9 0.42 0.0494 0.0026 0.1667 0.0087 0.0251 0.0006 165 126 157 8 160 4 22 373 337 51 1.11 0.0522 0.0014 0.3471 0.0091 0.0485 0.0007 295 68 303 7 305 5 23 31 49 6 0.63 0.0844 0.0059 0.6076 0.0668 0.0488 0.0014 1303 136 482 42 307 9 24 179 153 13 1.17 0.0591 0.0028 0.1965 0.0088 0.0247 0.0005 572 104 182 7 157 3 25 922 377 57 2.45 0.0510 0.0016 0.1754 0.0056 0.0251 0.0005 243 70 164 5 160 3 26 27 51 2 0.53 0.0547 0.0050 0.1657 0.0118 0.0245 0.0007 398 201 156 10 156 4 27 65 151 9 0.43 0.0542 0.0023 0.2395 0.0103 0.0325 0.0007 389 96 218 8 206 4 28 914 735 61 1.24 0.0490 0.0014 0.1658 0.0048 0.0245 0.0003 146 67 156 4 156 2 29 489 442 35 1.11 0.0506 0.0014 0.1740 0.0056 0.0248 0.0004 220 67 163 5 158 2 30 109 206 10 0.53 0.0498 0.0023 0.1684 0.0079 0.0247 0.0005 187 114 158 7 157 3 WJH-TW14(流纹岩)样品206Pb/238U年龄加权平均值为154.8±1.1Ma(MSWD=0.34,n=28) 1 225 323 18 0.70 0.0581 0.0025 0.1869 0.0082 0.0236 0.0005 532 99 174 7 150 3 2 102 130 8 0.78 0.0689 0.0038 0.2263 0.0130 0.0241 0.0006 896 114 207 11 153 4 3 197 207 15 0.95 0.0568 0.0031 0.1898 0.0097 0.0245 0.0005 483 116 176 8 156 3 4 122 217 10 0.56 0.0531 0.0026 0.1769 0.0085 0.0243 0.0006 345 111 165 7 155 4 5 338 446 26 0.76 0.0485 0.0016 0.1640 0.0061 0.0242 0.0005 124 71 154 5 154 3 6 129 222 11 0.58 0.0558 0.0029 0.1849 0.0092 0.0246 0.0006 456 119 172 8 157 4 7 185 321 16 0.58 0.0527 0.0021 0.1720 0.0067 0.0239 0.0005 322 93 161 6 152 3 8 155 272 13 0.57 0.0498 0.0022 0.1626 0.0071 0.0240 0.0005 187 102 153 6 153 3 9 193 311 15 0.62 0.0495 0.0022 0.1650 0.0071 0.0242 0.0005 172 97 155 6 154 3 10 194 339 17 0.57 0.0491 0.0022 0.1607 0.0072 0.0239 0.0004 154 107 151 6 152 3 11 45 108 4 0.42 0.0503 0.0042 0.1636 0.0122 0.0241 0.0006 209 -5 154 11 154 4 12 82 139 7 0.59 0.0538 0.0032 0.1831 0.0111 0.0248 0.0005 361 127 171 10 158 3 13 232 257 16 0.90 0.0496 0.0026 0.1629 0.0074 0.0241 0.0005 189 120 153 7 154 3 14 550 341 33 1.61 0.0472 0.0020 0.1580 0.0065 0.0244 0.0005 61 106 149 6 156 3 15 104 147 16 0.71 0.0538 0.0022 0.3951 0.0162 0.0536 0.0011 365 60 338 12 336 7 16 174 304 14 0.57 0.0487 0.0019 0.1632 0.0065 0.0244 0.0005 200 97 154 6 155 3 17 237 261 16 0.91 0.0496 0.0023 0.1651 0.0076 0.0243 0.0005 176 107 155 7 155 3 18 189 317 15 0.60 0.0521 0.0031 0.1777 0.0113 0.0244 0.0005 300 137 166 10 155 3 19 118 197 10 0.60 0.0461 0.0024 0.1579 0.0077 0.0251 0.0005 400 -280 149 7 160 3 20 166 300 13 0.55 0.0495 0.0020 0.1651 0.0066 0.0245 0.0005 172 94 155 6 156 3 21 144 247 11 0.59 0.0498 0.0024 0.1673 0.0079 0.0244 0.0005 187 108 157 7 155 3 22 172 289 13 0.60 0.0530 0.0024 0.1769 0.0079 0.0243 0.0005 328 100 165 7 155 3 23 154 215 12 0.72 0.0501 0.0027 0.1651 0.0086 0.0243 0.0005 198 128 155 7 155 3 24 321 437 39 0.74 0.0516 0.0014 0.3045 0.0086 0.0426 0.0006 333 58 270 7 269 4 25 168 284 13 0.59 0.0450 0.0021 0.1501 0.0069 0.0243 0.0005 - - 142 6 155 3 26 177 327 15 0.54 0.0497 0.0020 0.1660 0.0066 0.0244 0.0005 189 94 156 6 155 3 27 190 330 15 0.57 0.0486 0.0021 0.1618 0.0068 0.0243 0.0004 132 99 152 6 155 2 28 64 96 5 0.67 0.0552 0.0037 0.1786 0.0110 0.0245 0.0006 420 148 167 9 156 4 29 136 211 11 0.64 0.0519 0.0024 0.1747 0.0079 0.0245 0.0004 280 106 163 7 156 3 30 264 266 17 0.99 0.0479 0.0023 0.1599 0.0077 0.0243 0.0004 95 111 151 7 155 3 表 2 满克头鄂博组流纹岩主量、微量和稀土元素分析结果
Table 2 Major elements, trace elements and REE data of rhyolite samples in Manketouebo Formation
样品号 TW14-YQ5 TW14-YQ6 TW14-YQ7 TW14-YQ8 TW14-YQ9 样品号 TW14-YQ5 TW14-YQ6 TW14-YQ7 TW14-YQ8 TW14-YQ9 SiO2 78.40 77.69 76.71 78.48 77.64 Tm 0.086 0.084 0.081 0.081 0.088 Al2O3 13.29 13.35 13.73 13.15 13.37 Yb 0.58 0.57 0.56 0.53 0.57 Fe2O3 0.65 0.64 0.59 0.53 0.41 Lu 0.081 0.081 0.076 0.077 0.090 FeO 0.49 0.49 0.31 0.40 0.47 Y 6.18 5.73 5.17 5.17 5.84 CaO 0.10 0.13 0.092 0.088 0.072 Ba 602 620 924 583 891 MgO 0.34 0.44 0.30 0.30 0.26 Cr 9.74 5.83 8.90 6.82 9.74 Na2O 1.49 1.80 2.26 2.10 2.39 Ga 16.7 15.5 15.2 16.2 14.7 K2O 3.63 3.40 3.53 3.15 3.42 Nb 9.59 9.71 10.4 9.19 9.58 P2O5 0.049 0.061 0.026 0.030 0.013 Rb 109 103 102 99.8 96.2 TiO2 0.13 0.12 0.12 0.13 0.13 Sr 42.6 43.0 79.8 61.1 88.9 MnO 0.033 0.030 0.025 0.027 0.026 Zr 55.9 55.7 67.1 65.1 63.8 烧失量 1.68 1.66 1.80 1.78 1.70 Li 11.1 10.0 8.84 9.66 9.18 总计 100.29 99.82 99.51 100.17 99.91 Be 1.86 1.91 1.81 1.84 1.70 La 18.34 17.95 16.86 16.95 16.03 Sc 1.07 0.80 0.47 0.93 0.86 Ce 27.78 24.55 29.25 25.99 28.52 Co 1.47 1.58 1.30 1.30 1.31 Pr 4.26 4.19 3.52 3.65 3.45 Ni 7.33 7.76 4.99 5.53 5.39 Nd 14.6 14.4 11.5 11.8 12.1 U 0.46 0.60 0.41 0.39 0.40 Sm 2.47 2.37 1.97 2.05 1.97 Hf 2.24 2.25 2.38 2.20 2.47 Eu 0.87 0.70 0.83 0.67 0.96 Ta 0.51 0.54 0.55 0.54 0.61 Gd 1.42 1.27 1.21 1.07 1.25 Th 5.20 5.22 4.58 6.40 3.85 Tb 0.26 0.26 0.22 0.22 0.23 DI(分异指数) 90.5 90.3 91.6 91.4 92.1 Dy 1.25 1.18 1.08 1.07 1.05 Mg# 37.96 48.77 38.56 37.75 56.13 Ho 0.22 0.21 0.19 0.19 0.21 ΣREE 72.65 68.26 67.66 64.75 66.93 Er 0.45 0.42 0.34 0.36 0.44 δEu 1.31 1.12 1.53 1.24 1.75 表 3 大兴安岭地区满克头鄂博组火山岩锆石U-Pb同位素年龄统计
Table 3 Reported zircon U-Pb ages of volcanic rocks of Manketouebo Formation in Da Higgan Mountains
-
周其林, 王献忠, 吉峰, 等.大兴安岭中生代火山岩地层对比[J].地质论评, 2013, 59(6):255-265. http://d.old.wanfangdata.com.cn/Periodical/dzlp201306008 Zhang J H, GaoS, Ge W C, et al.Geochronology of the Mesozoic volcanic rocks in the Great Xing'an Range, northeastern China:implications for subduction-induced delamination[J]. Chemical Geology, 2010, 276:144-165. doi: 10.1016/j.chemgeo.2010.05.013
杨扬, 高福红, 陈井胜, 等.赤峰地区中生代火山岩锆石U-Pb年代学证据[J].吉林大学学报:地球科学版, 2012, 42(增刊2):257-268. http://www.cnki.com.cn/Article/CJFDTOTAL-CCDZ2012S2029.htm 张超, 杨伟红, 和钟铧, 等.大兴安岭中南段塔尔气地区满克头鄂博组流纹岩年代学和地球化学研究[J].世界地质, 2014, 33(2):255-265. doi: 10.3969/j.issn.1004-5589.2014.02.002 杜洋, 刘正宏, 崔维龙, 等.大兴安岭克一河地区满克头鄂博组火山岩形成时代、地球化学特征及地质意义[J].世界地质, 2017, 36(1):54-65. doi: 10.3969/j.issn.1004-5589.2017.01.005 王春宇, 王东彬, 屈嘉骥.大兴安岭北段克一河地区满克头鄂博组流纹岩的年代及地球化学特征[J].黑龙江科技大学学报, 2017, (1):46-50. doi: 10.3969/j.issn.2095-7262.2017.01.010 周智超, 蒋职权.内蒙古扎赉特旗满克头鄂博组火山岩地球化学特征及其成因[J].西部资源, 2017, (3):1-4. doi: 10.3969/j.issn.1672-562X.2017.03.002 Liu Y S, Gao S, Hu Z, et al. Continental andoceanic crust recyclinginduced melt-peridotite interactions in the Trans-North China Orogen:U-Pb dating, Hf isotopes and trace elements in zircons from mantle xenoliths[J]. Journal of Petrology, 2009, 51(1&2):537-571.
Liu, Y S, Hu Z C, Zong K Q, et al. Reappraisement and refinement of zircon U-Pb isotope and trace element analyses by LA-ICPMS[J]. Chinese Science Bulletin, 2010, 55(15):1535-1546. doi: 10.1007/s11434-010-3052-4
Ludwig K R. Isoplot 3.0-a geochronological toolkit for Microsoft Excel[J]. Special Publication Berkeley Geochronology Center, 2003:1-70. https://www.researchgate.net/publication/284758218_ISOPLOT_30_A_Geochronological_Toolkit_for_Microsoft_Excel_Berkeley_Geochronology_Center_Special_Publication
李鹏川, 李世超, 刘正宏, 等.内蒙古林西地区满克头鄂博组火山岩形成时代及构造环境[J].世界地质, 2016, 35(1):77-88. doi: 10.3969/j.issn.1004-5589.2016.01.008 许文良, 王枫, 裴福萍, 等.中国东北中生代构造体制与区域成矿背景:来自中生代火山岩组合时空变化的制约[J].岩石学报, 2013, 29(2):339-353. http://d.old.wanfangdata.com.cn/Periodical/ysxb98201302001 Wang F, Zhou X H, Zhang L C, et al. Late Mesozoic volcanism in the Great Xing'an Range (NE China):Timing and implications for the dynamic setting of NE Asia[J]. Earth and Planetary Science Letters, 2006, 251:179-198. doi: 10.1016/j.epsl.2006.09.007
秦涛, 郑常青, 崔天日, 等.内蒙古扎兰屯地区白音高老组火山岩地球化学、年代学及其地质意义[J].地质与资源, 2014, 23(2):146-153. doi: 10.3969/j.issn.1671-1947.2014.02.011 孟恩, 许文良, 杨德彬, 等.满洲里地区灵泉盆地中生代火山岩的锆石U-Pb年代学、地球化学及其地质意义[J].岩石学报, 2011, 27(4):1209-1226. http://www.cnki.com.cn/Article/CJFDTOTAL-YSXB201104029.htm 林强, 葛文春, 孙德有, 等.中国东北地区中生代火山岩的大地构造意义[J].地质科学, 1998, 32(2):129-139. http://www.wanfangdata.com.cn/details/detail.do?_type=perio&id=QK199800069875 Yuan H L, Gao S, Liu X, et al. Accurate U-Pb age and trace element determinations of zircon by laser ablation-inductively coupled plasma-mass spectrometry[J]. Geostandards and Geoanalytical Research, 2004, 28(3):353-370.
郭锋, 范蔚铭, 王岳军, 等.大兴安岭南段晚中生代双峰式火山作用[J].岩石学报, 2001, 17(1):161-168. http://d.old.wanfangdata.com.cn/Periodical/ysxb98200101017 张玉涛, 张连昌, 英基丰, 等.大兴安岭北部扎兰屯脉岩群的地球化学特征及其地质意义[J].岩石学报, 2006, 22(11):2733-2742. http://d.old.wanfangdata.com.cn/Periodical/ysxb98200611011 高晓峰, 郭锋, 李超文.南兴安岭晚中生代火山岩的岩石成因(Ⅱ):Pb同位素制约[J].中山大学学报(自然科学版), 2009, 48(6):121-126. doi: 10.3321/j.issn:0529-6579.2009.06.024 赵国龙, 杨桂林, 傅嘉友, 等.大兴安岭中南部中生代火山岩[M].北京:北京科学技术出版社, 1989:1-260. 孟凡超, 刘嘉麒, 崔岩, 等.中国东北地区中生代构造体制的转变:来自火山岩时空分布与岩石组合的制约[J].岩石学报, 2014, 30(12):3569-3586. http://d.old.wanfangdata.com.cn/Periodical/ysxb98201412008