Discovery of Middle Jurassic volcanic rocks in the Duobaoshan area of Heilongjiang Province and constraints on the influence area of the Mongolian-Okhotsk Ocean closure
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摘要:
黑龙江省多宝山地区位于中亚造山带东段、兴安地块东南缘，发育大面积早—中侏罗世侵入岩，但至今未发现同时代的火山岩。在多宝山地区首次发现了同时期的火山岩，并确定为一套英安岩、流纹岩和粗面岩组合。为进一步明确其形成时代及反映的构造意义，对出露的火山岩开展了锆石U-Pb测年和岩石地球化学分析。锆石U-Pb年龄显示，火山岩形成时代为167.1~169.3 Ma，为中侏罗世喷发成岩。火山岩具有富碱（Na2O+K2O=3.70%~7.66%）、富铝（Al2O3=11.42%~19.00%）的特征，属于高钾钙碱性、过铝质（A/CNK=1.08~3.73）岩石。稀土元素呈轻稀土元素富集、重稀土元素亏损的右倾特征，具负Eu异常（δEu=0.53~0.79）。微量元素显示富集Rb、Ba、K、Th、U、Pb，亏损Nb、Ta、Ti、P、Sr。总体显示，该中侏罗世火山岩起源于新生陆壳物质的部分熔融。根据Ta-Yb、Nb-Y构造环境判别图解，该期火山岩形成于挤压背景环境。结合区域构造背景及其演化特征，综合认为，中侏罗世火山岩应是蒙古-鄂霍茨克洋闭合过程导致的陆-陆碰撞作用的产物。闭合导致的陆陆碰撞作用已影响到兴安地块东南缘。
Abstract:The Duobaoshan area of Heilongjiang Province is located in the eastern part of the Central Asian Orogenic Belt and the southeastern margin of the Xing'an Block, where large areas of Early-Middle Jurassic intrusive rocks are developed, but no contemporaneous volcanic rock has been reported there. During the exploration of gold deposits in the Duobaoshan area, volcanic rocks of the same period were discovered for the first time and they were identified as a suit of dacite, rhyolite, and trachyte. Zircon U-Pb dating and petrogeochemical analyses were carried out on these volcanic rocks to further clarify their formation age and tectonic significance. The U-Pb dating of zircons from the volcanic rocks yielded ages of 167.1~169.3 Ma, indicating that these rocks erupted during Middle Jurassic. The petrogeochemical analysis shows that the volcanic rocks are characterized by high alkali (Na2O+ K2O=3.70%~7.66%) and aluminum (Al2O3=11.42%~19.00%), and are peraluminous (A/CNK=1.08~3.73) with high potassium calcium alkali. The rare earth elements are characterized by the enrichment of light rare earth elements and right-leaning of heavy rare earth elements depletion, with slightly negative Eu anomalies (δEu=0.53~0.79).Trace elements are enriched in Rb, Ba, K, Th, U and Pb, and depleted in Nb, Ta, Ti, P and Sr.It is generally shown that the Mid-Jurassic volcanic rocks were derived from the partial melting of newly continental crust material. The discriminant diagrams of Ta-Yb and Nb-Y indicates that the Middle Jurassic volcanic rocks were formed in the compressional background. Combined with the regional tectonic setting and evolution characteristics, it is concluded that the Middle Jurassic volcanic rocks should be the product of the continent-continent collision caused by Mongolian-Okhotsk Ocean closure.Indicatively, the collision affected the southeastern margin of the Xing'an Block.
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致谢: 感谢黑龙江省地质科学研究所李檬、赵洪强高级工程师对采样工作的支持；感谢黑龙江省自然资源调查院周兴福教授级高级工程师对野外调查工作的指导与帮助。
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图版Ⅰ
a、b.英安岩，石英斑晶发生一定溶蚀；c.流纹岩；d.粗面岩；e、f.英安质熔结凝灰岩，显微镜下具明显的假流动构造。Qtz—石英；Pl—斜长石；Ser—绢云母；Bt—黑云母；Sa—透长石；Mc—微斜长石
图版Ⅰ.
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图 2 英安岩锆石阴极发光图像及年龄
Figure 2. Cathodoluminescence images of the zircons from the dacite samples
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图 3 英安岩样品(ZK0402U-Pb02)锆石U-Pb年龄谐和图
Figure 3. The zircon U-Pb age concordia diagram of the dacite sample (ZK0402U-Pb02)
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图 4 英安岩样品(ZK0803U-Pb04)锆石U-Pb年龄谐和图
Figure 4. The zircon U-Pb age concordia diagram of the dacite sample(ZK0803U-Pb04)
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图 5 流纹岩样品(ZK0402U-Pb01)锆石阴极发光图像及年龄
Figure 5. Cathodoluminescence (CL) images of the zircons from the rhyolite sample(ZK0402U-Pb01)
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图 6 流纹岩(ZK0402U-Pb01)锆石U-Pb年龄谐和图
Figure 6. Zircon U-Pb age concordia diagram of the rhyolite sample(ZK0402U-Pb01)
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图 9 中侏罗世火山岩Yb-Ta图解(a)和Y-Nb图解[44] (b)
Figure 9. Yb-Ta (a) and Y-Nb(b) diagrams of the Middle Jurassic volcanic rocks
表 1 英安岩样品(ZK0402U-Pb-02)LA-ICP-MS锆石U-Th-Pb同位素测年数据
Table 1 LA-ICP-MS U-Th-Pb isotopic dating results of the zircon samples from the dacite(ZK0402U-Pb-02)
测点 含量/10-6 232Th/238U 207Pb/206Pb年龄/Ma 1σ 207Pb/235U年龄/Ma 1σ 206Pb/238U年龄/Ma 1σ 208Pb/232Th年龄/Ma 1σ 208Pb/232Th 1σ 207Pb/206Pb 1σ 207Pb/235U 1σ 206Pb/238U 1σ Pb Th U ZK0402U-Pb-02-01 9.91 252 303 0.8317 58 119 155 7.3 162 2.2 145 3.8 0.0072 0.0002 0.0472 0.0024 0.1652 0.0084 0.0255 0.0003 ZK0402U-Pb-02-02 4.45 92 130 0.7062 250 148 178 9.3 173 2.5 151 4.9 0.0075 0.0002 0.0512 0.0033 0.1912 0.0109 0.0273 0.0004 ZK0402U-Pb-02-03 3.14 52 98 0.5337 13 185 156 10.1 170 2.9 153 6.9 0.0076 0.0003 0.0463 0.0037 0.1658 0.0116 0.0267 0.0005 ZK0402U-Pb-02-04 4.25 87 130 0.6669 187 170 166 10.2 167 2.7 154 5.4 0.0076 0.0003 0.0498 0.0036 0.1775 0.0118 0.0262 0.0004 ZK0402U-Pb-02-05 3.07 49 95 0.5132 232 191 177 11.8 176 3.2 144 7.1 0.0071 0.0004 0.0508 0.0042 0.1907 0.0138 0.0276 0.0005 ZK0402U-Pb-02-06 2.99 95 83 1.1393 217 191 169 11.7 166 2.9 150 4.9 0.0074 0.0002 0.0505 0.0041 0.1813 0.0136 0.0261 0.0005 ZK0402U-Pb-02-07 3.52 77 111 0.6928 239 178 166 10.3 163 3.0 150 6.1 0.0074 0.0003 0.0509 0.0039 0.1773 0.0119 0.0256 0.0005 ZK0402U-Pb-02-08 3.78 72 122 0.5861 198 200 163 13.0 161 3.0 153 6.6 0.0076 0.0003 0.0501 0.0046 0.1742 0.0151 0.0254 0.0005 ZK0402U-Pb-02-09 5.33 110 161 0.6832 189 146 173 9.7 175 2.8 150 5.3 0.0075 0.0003 0.0497 0.0031 0.1858 0.0113 0.0275 0.0004 ZK0402U-Pb-02-10 3.92 73 121 0.6000 143 178 166 10.6 173 2.9 149 6.2 0.0074 0.0003 0.0489 0.0039 0.1779 0.0123 0.0273 0.0005 ZK0402U-Pb-02-11 3.29 61 105 0.5771 361 168 175 11.9 166 3.3 153 6.3 0.0076 0.0003 0.0537 0.0041 0.1879 0.0139 0.0261 0.0005 ZK0402U-Pb-02-12 1.65 43 48 0.8965 506 256 176 14.5 169 4.6 155 8.2 0.0077 0.0004 0.0574 0.0066 0.1892 0.017 0.0265 0.0007 ZK0402U-Pb-02-13 3.40 64 108 0.5917 439 157 186 11.2 168 3.1 151 6.8 0.0075 0.0003 0.0557 0.0039 0.2007 0.0133 0.0264 0.0005 ZK0402U-Pb-02-14 1.97 49 59 0.8288 450 227 180 13.8 164 3.6 159 7.6 0.0079 0.0004 0.0559 0.0058 0.1938 0.0163 0.0257 0.0006 ZK0402U-Pb-02-15 4.43 102 133 0.7669 109 163 163 9.9 170 2.4 151 5.2 0.0075 0.0003 0.0482 0.0035 0.1737 0.0114 0.0267 0.0004 ZK0402U-Pb-02-16 3.91 91 116 0.7810 361 146 182 10.2 169 2.7 149 5.0 0.0074 0.0002 0.0537 0.0035 0.1963 0.0121 0.0266 0.0004 ZK0402U-Pb-02-17 3.87 103 112 0.9196 72 185 160 10.1 170 3.0 145 4.9 0.0072 0.0002 0.0475 0.0039 0.1705 0.0116 0.0267 0.0005 ZK0402U-Pb-02-18 5.25 145 152 0.9539 354 142 181 10.2 166 2.8 153 4.7 0.0076 0.0002 0.0536 0.0035 0.195 0.012 0.0262 0.0004 ZK0402U-Pb-02-19 4.55 73 144 0.5090 211 157 170 9.8 169 2.7 154 5.9 0.0077 0.0003 0.0501 0.0034 0.1826 0.0114 0.0265 0.0004 ZK0402U-Pb-02-20 10.94 288 314 0.9172 387 104 185 7.8 170 2.2 153 3.7 0.0076 0.0002 0.0544 0.0025 0.2001 0.0092 0.0267 0.0003 ZK0402U-Pb-02-21 1.73 41 51 0.7953 146 241 163 15.2 165 3.9 162 8.1 0.008 0.0004 0.049 0.0054 0.174 0.0176 0.026 0.0006 ZK0402U-Pb-02-22 3.18 68 93 0.7292 98 189 165 11.7 172 3.1 161 5.6 0.008 0.0003 0.048 0.004 0.1769 0.0136 0.027 0.0005 ZK0402U-Pb-02-23 12.59 289 367 0.7875 272 93 182 6.9 175 2.9 162 4.0 0.008 0.0002 0.0517 0.0021 0.1959 0.0081 0.0275 0.0005 ZK0402U-Pb-02-24 14.96 353 435 0.8115 200 97 168 5.7 170 1.3 153 3.0 0.0076 0.0001 0.0487 0.0019 0.1796 0.0066 0.0267 0.0002 ZK0402U-Pb-02-25 3.62 84 104 0.8087 272 170 178 11.1 173 2.9 157 5.6 0.0078 0.0003 0.0517 0.0038 0.1913 0.0131 0.0272 0.0005 ZK0803U-Pb-04-01 6.69 119 203 0.5862 56 135 164 8.9 174 2.4 156 4.9 0.0078 0.0002 0.047 0.0029 0.1752 0.0103 0.0273 0.0004 ZK0803U-Pb-04-02 6.99 87 219 0.3954 195 135 178 9.5 178 2.3 161 5.6 0.008 0.0003 0.05 0.0029 0.1915 0.0112 0.028 0.0004 ZK0803U-Pb-04-04 6.26 189 168 1.1250 239 135 176 8.9 173 2.3 152 3.5 0.0076 0.0002 0.051 0.003 0.1895 0.0105 0.0273 0.0004 ZK0803U-Pb-04-05 3.12 91 89 1.0316 483 176 182 11.1 167 3.3 149 5.1 0.0074 0.0003 0.0568 0.0045 0.1963 0.0131 0.0262 0.0005 ZK0803U-Pb-04-06 8.19 127 257 0.4942 367 118 187 8.7 174 2.3 150 5.1 0.0074 0.0003 0.0537 0.0027 0.2025 0.0103 0.0274 0.0004 ZK0803U-Pb-04-07 9.36 176 285 0.6175 387 122 184 8.4 170 2.3 158 4.3 0.0078 0.0002 0.0544 0.003 0.1983 0.0099 0.0267 0.0004 ZK0803U-Pb-04-08 6.46 68 206 0.3277 300 135 181 9.0 176 2.4 160 5.9 0.008 0.0003 0.0521 0.0031 0.1947 0.0106 0.0277 0.0004 ZK0803U-Pb-04-09 15.60 316 455 0.6945 256 94 179 6.6 175 1.4 157 3.5 0.0078 0.0002 0.0512 0.0021 0.1931 0.0078 0.0275 0.0002 ZK0803U-Pb-04-10 21.22 438 640 0.6844 83 93 165 6.2 171 1.5 151 2.7 0.0075 0.0001 0.0477 0.0019 0.1768 0.0072 0.0269 0.0002 ZK0803U-Pb-04-11 17.16 273 530 0.5151 243 79 179 6.1 174 1.6 152 3.4 0.0076 0.0002 0.0511 0.0019 0.1926 0.0071 0.0274 0.0003 ZK0803U-Pb-04-12 8.22 160 247 0.6478 346 100 184 7.0 173 1.9 147 3.8 0.0073 0.0002 0.0534 0.0024 0.1983 0.0082 0.0272 0.0003 ZK0803U-Pb-04-14 4.75 131 136 0.9632 389 145 181 9.7 166 2.5 145 4.6 0.0072 0.0002 0.0542 0.0034 0.1956 0.0114 0.0261 0.0004 ZK0803U-Pb-04-15 2.65 77 76 1.0211 232 216 166 10.1 165 3.1 148 5.2 0.0074 0.0003 0.0508 0.004 0.1774 0.0117 0.026 0.0005 ZK0803U-Pb-04-16 5.96 154 168 0.9167 195 122 171 8.1 172 2.6 160 4.4 0.008 0.0002 0.05 0.0026 0.1836 0.0094 0.027 0.0004 ZK0803U-Pb-04-17 14.43 217 456 0.4759 143 90 168 6.4 170 1.9 154 4.0 0.0076 0.0002 0.0489 0.0019 0.1801 0.0074 0.0267 0.0003 ZK0803U-Pb-04-18 7.39 128 211 0.6066 298 117 187 8.9 179 2.3 171 4.9 0.0085 0.0002 0.0523 0.0027 0.2028 0.0105 0.0282 0.0004 ZK0803U-Pb-04-19 22.94 401 696 0.5761 154 79 175 5.5 176 2.2 164 3.6 0.0082 0.0002 0.0491 0.0016 0.1878 0.0065 0.0276 0.0003 ZK0803U-Pb-04-20 25.87 449 792 0.5669 143 81 170 5.4 172 1.5 158 3.1 0.0079 0.0002 0.0489 0.0017 0.1824 0.0063 0.0271 0.0002 ZK0803U-Pb-04-21 8.55 133 267 0.4981 146 112 169 7.4 172 2.1 164 4.3 0.0081 0.0002 0.0489 0.0024 0.1814 0.0086 0.0271 0.0003 ZK0803U-Pb-04-22 11.45 208 329 0.6322 209 122 178 7.1 176 2.0 201 6.7 0.01 0.0003 0.0503 0.0027 0.1912 0.0083 0.0276 0.0003 ZK0803U-Pb-04-23 8.19 175 238 0.7353 394 126 194 9.5 176 2.9 178 5.1 0.0089 0.0003 0.0546 0.003 0.2101 0.0113 0.0277 0.0005 ZK0803U-Pb-04-24 12.64 293 378 0.7751 198 93 176 6.5 174 1.9 148 3.5 0.0073 0.0002 0.0501 0.002 0.1892 0.0076 0.0274 0.0003 ZK0803U-Pb-04-25 6.46 111 190 0.5842 256 131 187 9.7 182 2.5 172 5.6 0.0086 0.0003 0.0511 0.0029 0.2017 0.0115 0.0286 0.0004 ZK0803U-Pb-04-26 23.42 464 706 0.6572 165 89 178 6.5 178 1.8 159 3.1 0.0079 0.0002 0.0493 0.0019 0.1912 0.0076 0.028 0.0003 ZK0803U-Pb-04-27 5.71 202 152 1.3289 317 122 178 8.5 169 2.7 156 3.9 0.0077 0.0002 0.0527 0.0028 0.1916 0.0099 0.0266 0.0004 ZK0803U-Pb-04-28 7.19 105 220 0.4773 100 117 172 8.5 179 2.2 166 5.1 0.0082 0.0003 0.0478 0.0027 0.1846 0.01 0.0282 0.0003 ZK0803U-Pb-04-29 15.37 234 449 0.5212 409 81 197 6.2 181 1.7 185 4.1 0.0092 0.0002 0.0549 0.002 0.2144 0.0074 0.0285 0.0003 ZK0803U-Pb-04-30 7.42 134 234 0.5726 280 113 172 7.4 166 2.2 157 4.6 0.0078 0.0002 0.0519 0.0026 0.1842 0.0086 0.026 0.0004 ZK0803U-Pb-04-31 9.87 241 272 0.8860 372 116 188 7.8 174 2.0 173 4.7 0.0086 0.0002 0.054 0.0028 0.2029 0.0093 0.0274 0.0003 ZK0803U-Pb-04-33 6.48 251 174 1.4425 33 133 154 7.7 163 2.5 145 3.5 0.0072 0.0002 0.0465 0.0027 0.1633 0.0088 0.0257 0.0004 ZK0803U-Pb-04-34 2.06 53 60 0.8837 232 198 161 9.1 163 4.0 168 6.5 0.0084 0.0003 0.0508 0.0043 0.1722 0.0105 0.0256 0.0006 ZK0803U-Pb-04-36 17.30 363 519 0.6994 154 85 168 5.5 170 1.7 150 3.2 0.0074 0.0002 0.0491 0.0018 0.1801 0.0064 0.0266 0.0003 ZK0803U-Pb-04-37 4.25 109 121 0.9008 367 156 182 10.1 172 2.6 149 5.0 0.0074 0.0002 0.0537 0.0037 0.1966 0.0119 0.0271 0.0004 ZK0803U-Pb-04-38 21.23 439 618 0.7104 172 81 175 5.3 174 1.5 157 2.6 0.0078 0.0001 0.0495 0.0016 0.1877 0.0062 0.0273 0.0002 ZK0803U-Pb-04-39 10.07 153 309 0.4951 302 156 193 12.7 182 3.5 161 5.1 0.008 0.0003 0.0524 0.0035 0.2092 0.0151 0.0287 0.0006 ZK0803U-Pb-04-32 21.88 139 253 0.5494 309 77 427 10.6 449 4.3 409 8.2 0.0204 0.0004 0.0526 0.0017 0.5224 0.0159 0.0721 0.0007 ZK0803U-Pb-04-13 39.90 288 214 1.3458 854 -147 805 13.5 788 6.0 704 11.5 0.0354 0.0006 0.0675 0.0017 1.2091 0.0294 0.13 0.001 
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表 2 流纹岩样品(ZK0402U-Pb-01)LA-ICP-MS锆石U-Th-Pb同位素测年数据
Table 2 LA-ICP-MS U-Th-Pb isotopic dating results of the zircon samples from the rhyolite(ZK0402U-Pb-01)
测点 含量/10-6 232Th/238U 207Pb/206Pb年龄/Ma 1σ 207Pb/235U年龄/Ma 1σ 206Pb/238U年龄/Ma 1σ 208Pb/232Th年龄/Ma 1σ 208Pb/232Th 1σ 207Pb/206Pb 1σ 207Pb/235U 1σ 206Pb/238U 1σ Pb Th U ZK0402U-Pb-01-01 8.12 119 274 0.4348 302 119 171 8.4 161 2.0 162 4.7 0.0081 0.0002 0.0523 0.0027 0.1840 0.0098 0.0254 0.0003 ZK0402U-Pb-01-02 8.09 140 254 0.5491 300 147 178 8.0 171 2.3 164 4.6 0.0082 0.0002 0.0522 0.0026 0.1914 0.0094 0.0268 0.0004 ZK0402U-Pb-01-03 5.07 100 155 0.6421 417 126 184 9.3 166 2.9 175 6.7 0.0087 0.0003 0.0551 0.0031 0.1985 0.0110 0.0262 0.0005 ZK0402U-Pb-01-04 9.83 193 301 0.6417 346 106 180 6.9 169 2.3 160 3.7 0.0080 0.0002 0.0534 0.0024 0.1941 0.0081 0.0266 0.0004 ZK0402U-Pb-01-05 10.86 147 353 0.4153 132 101 165 6.7 168 1.9 162 4.6 0.0081 0.0002 0.0487 0.0022 0.1770 0.0077 0.0264 0.0003 ZK0402U-Pb-01-06 6.00 87 191 0.4571 261 131 174 8.5 169 2.4 165 5.7 0.0082 0.0003 0.0515 0.0029 0.1866 0.0099 0.0266 0.0004 ZK0402U-Pb-01-07 8.64 132 292 0.4513 42.7 119 154 7.1 161 2.1 151 4.5 0.0075 0.0002 0.0469 0.0024 0.1634 0.0081 0.0253 0.0003 ZK0402U-Pb-01-08 10.00 133 333 0.4000 176 115 166 7.4 166 2.3 159 4.7 0.0079 0.0002 0.0496 0.0024 0.1775 0.0086 0.0261 0.0004 ZK0402U-Pb-01-09 9.67 153 321 0.4754 64.9 100 156 5.6 163 2.1 167 4.8 0.0083 0.0002 0.0473 0.0020 0.1659 0.0065 0.0256 0.0003 ZK0402U-Pb-01-10 8.49 225 241 0.9337 261 122 172 8.2 166 2.2 162 4.0 0.0080 0.0002 0.0514 0.0027 0.1850 0.0096 0.0262 0.0003 ZK0402U-Pb-01-11 27.57 222 926 0.2400 200 67 170 4.4 172 1.7 159 4.0 0.0079 0.0002 0.0488 0.0014 0.1819 0.0051 0.0270 0.0003 ZK0402U-Pb-01-12 8.17 170 251 0.6775 122 106 165 7.9 168 2.6 159 4.8 0.0079 0.0002 0.0483 0.0025 0.1760 0.0091 0.0264 0.0004 ZK0402U-Pb-01-13 15.46 291 473 0.6155 211 103 173 7.4 171 1.9 173 4.5 0.0086 0.0002 0.0502 0.0023 0.1859 0.0087 0.0268 0.0003 ZK0402U-Pb-01-14 9.54 179 297 0.6038 367 105 180 7.9 167 2.0 158 4.1 0.0078 0.0002 0.0537 0.0026 0.1939 0.0092 0.0262 0.0003 ZK0402U-Pb-01-15 15.14 213 480 0.4429 332 80 185 6.2 174 2.0 164 5.3 0.0081 0.0003 0.0531 0.0019 0.2003 0.0073 0.0273 0.0003 ZK0402U-Pb-01-16 8.63 136 264 0.5151 300 120 179 8.3 172 2.2 172 5.1 0.0085 0.0003 0.0522 0.0027 0.1933 0.0097 0.0271 0.0004 ZK0402U-Pb-01-17 9.53 112 302 0.3713 354 115 184 8.1 172 1.9 175 4.7 0.0087 0.0002 0.0536 0.0027 0.1990 0.0096 0.0270 0.0003 ZK0402U-Pb-01-18 6.80 155 208 0.7467 78 139 156 8.0 163 2.4 158 4.5 0.0078 0.0002 0.0474 0.0031 0.1665 0.0091 0.0256 0.0004 ZK0402U-Pb-01-19 10.75 129 355 0.3638 394 93 185 7.0 168 2.2 169 4.5 0.0084 0.0002 0.0546 0.0022 0.1993 0.0083 0.0263 0.0004 ZK0402U-Pb-01-20 10.62 240 321 0.7460 345 94 179 7.1 166 2.2 153 3.9 0.0076 0.0002 0.0532 0.0022 0.1926 0.0083 0.0261 0.0003 ZK0402U-Pb-01-21 12.45 192 395 0.4878 233 98 172 6.4 168 1.8 165 4.5 0.0082 0.0002 0.0507 0.0021 0.1841 0.0075 0.0264 0.0003 ZK0402U-Pb-01-22 15.07 165 481 0.3434 169 91 173 6.2 173 1.8 170 4.3 0.0084 0.0002 0.0494 0.0019 0.1858 0.0072 0.0271 0.0003 ZK0402U-Pb-01-23 7.82 104 256 0.4044 139 98 163 5.8 165 1.9 167 4.9 0.0083 0.0002 0.0488 0.0021 0.1743 0.0067 0.0259 0.0003 ZK0402U-Pb-01-24 11.14 152 351 0.4323 209 112 172 7.3 170 2.0 180 13.3 0.0089 0.0007 0.0503 0.0023 0.1847 0.0085 0.0267 0.0003 ZK0402U-Pb-01-25 9.08 134 301 0.4456 150 150 161 7.4 162 2.3 173 6.3 0.0086 0.0003 0.0491 0.0025 0.1716 0.0085 0.0255 0.0004
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表 3 中侏罗世火山岩主量、稀土及微量元素分析结果
Table 3 Major, trace and rare earth elements compositions of the Middle Jurassic volcanic rocks
样号 YTZK01 YTZK02 YTZK03 YTZK04 YTZK05 YTZK06 YTZK07 岩石名称 英安岩 粗面岩 流纹岩 流纹岩 英安岩 英安岩 英安岩 SiO2 66.14 60.2 77.88 73.95 64.03 61.23 66.78 TiO2 0.98 0.7 0.11 0.27 0.86 1.10 0.72 Al2O3 15.37 19.00 11.42 13.18 16.89 18.77 14.54 Fe2O3 2.15 2.12 1.19 0.64 2.72 2.15 1.27 FeO 2.57 1.82 0.06 0.99 1.36 5.75 2.28 MnO 0.11 0.08 0.02 0.08 0.05 0.15 0.16 MgO 1.12 1.3 0.25 1.01 0.92 1.60 1.20 CaO 1.84 2.92 0.57 1.68 0.46 0.29 2.61 Na2O 4.32 3.88 1.93 0.10 0.23 0.26 3.27 K2O 2.88 3.78 3.97 3.60 4.41 3.79 3.13 P2O5 0.35 0.33 0.04 0.08 0.23 0.17 0.21 烧失量 1.46 3.14 2.04 4.41 4.24 3.81 3.48 总量 99.29 99.27 99.48 100.01 96.40 99.06 99.64 分异指数(DI) 69.77 65.65 85.6 79.49 71.24 63.43 70.50 Na2O+ K2O 7.20 7.66 5.90 3.70 4.64 4.05 6.40 A/NK 1.50 1.81 1.53 3.25 3.28 4.15 1.66 A/CNK 1.13 1.20 1.34 1.85 2.82 3.73 1.08 SI 8.59 10.09 3.40 15.98 9.67 11.83 10.74 AR 2.44 2.07 1.95 1.66 1.73 1.54 2.19 σ43 2.24 3.41 1.00 0.44 1.02 0.9 1.72 Rb — — — 127.11 154.74 127.15 78.81 Ba — — — 412.84 566.55 401.77 814.69 Th 8.54 11.14 10.52 13.17 7.69 7.40 7.89 U — — — 4.36 2.47 1.68 2.42 Nb 13.4 13.99 12.56 10.67 13.41 15.11 12.12 Ta 0.91 1.31 2.05 1.07 0.81 0.97 0.77 Pb 11.6 19.1 26.6 30.09 17.81 2.19 24.87 Sr 276 372 91 65.51 77.39 77.04 388.49 Zr 321 308 133 101.35 302.37 226.51 251.32 Hf — — — 3.37 7.53 5.81 6.62 Y 40.07 36.33 12.79 18.06 37.53 24.04 33.76 La 41.03 49.09 29.31 30.0 37.3 28.7 34.4 Ce 86.85 82.47 57.48 59.4 80.70 61.80 75.00 Pr 11.61 12.19 6.53 6.50 9.83 7.31 9.03 Nd 47.52 47.79 22.30 21.6 40.0 28.6 36.2 Sm 9.65 9.40 3.45 3.86 7.91 5.85 7.66 Eu 2.29 2.33 0.55 0.66 1.92 1.24 1.75 Gd 8.93 8.42 2.75 2.79 7.49 4.94 6.67 岩石名称 英安岩 粗面岩 流纹岩 流纹岩 英安岩 英安岩 英安岩 Tb 1.42 1.35 0.41 0.47 1.13 0.80 1.02 Dy 7.94 7.42 2.20 2.83 6.37 4.26 5.75 Ho 1.56 1.38 0.43 0.59 1.31 0.92 1.18 Er 4.26 3.9 1.37 1.73 3.55 2.49 3.28 Tm 0.62 0.55 0.23 0.28 0.52 0.35 0.50 Yb 3.81 3.57 1.62 2.00 3.34 2.50 3.22 Lu 0.55 0.54 0.27 0.33 0.52 0.40 0.48 ∑REE 228.04 230.40 128.90 132.96 201.93 150.07 186.20 ∑LREE 198.95 203.27 119.62 121.95 177.69 133.42 164.09 ∑HREE 29.09 27.13 9.28 11.01 24.24 16.65 22.10 δEu 0.74 0.79 0.53 0.59 0.75 0.69 0.73 δCe 0.92 0.77 0.94 0.96 0.97 0.98 0.98 (La/Yb)N 7.28 9.29 12.23 10.14 7.55 7.74 7.23 (La/Sm)N 2.68 3.29 5.35 4.89 2.97 3.08 2.83 (Gd/Yb)N 1.90 1.91 1.38 1.13 1.82 1.60 1.68 ∑LREE/∑HREE 6.84 7.49 12.89 11.07 7.33 8.02 7.42 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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