Age and petrogenetic implication of the Early Mesozoic dykes in the southwestern Ordos Basin
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摘要:
鄂尔多斯盆地西南部龙门地区早中生代侵入岩是盆地内少有的岩浆活动记录, 为探讨盆地早中生代形成构造背景提供了理想的研究对象。对鄂尔多斯盆地龙门地区早中生代侵入岩开展岩相学、岩石地球化学及年代学研究。结果表明, 侵入岩为钙碱性-高钾钙碱性闪长玢岩和二长玢岩, 二者均呈低Mg#、Cr、Ni和Co含量, 富集REE和LILE, 贫HFSE, 亏损Nb、Ta、Ti和P的特征, 锆石εHf(t)=-33.89~-9.73, tDM2=1564~2780 Ma, 主要为古元古代和部分新太古代陆壳物质部分熔融的产物。二长玢岩的轻、重稀土元素分馏略低于闪长玢岩, 具有更低的Yb、Y和高的Sr、Sr/Y值, 指示其为压力较高条件下盆地基底较深陆壳物质部分熔融的产物; 闪长玢岩则为较低压力下的较浅基底陆壳物质熔融的产物。两类岩石均获得242 Ma的形成年龄, 与盆地以南秦岭造山带早中生代洋盆俯冲闭合、陆-陆碰撞挤压初期的岩浆活动一致, 表明秦岭造山带早中生代以来的构造岩浆活动影响到鄂尔多斯盆地西南部地区, 盆地内早中生代侵入岩的出现是秦岭勉略洋盆向北俯冲汇聚挤压环境背景下, 鄂尔多斯盆地基底不同深度陆壳物质部分熔融侵入的结果。2类岩石的形成年龄与盆地南缘秦岭造山带中生代构造转折时期相对应, 即从晚三叠世长7段沉积开始, 鄂尔多斯盆地由之前的挤压环境开始向伸展环境转变。
Abstract:The Early Mesozoic dykes in Longmen area, the southwestern Ordos Basin are infrequent records of magmatism, which provides an ideal object for discussing the tectonic setting of the Early Mesozoic in the Ordos Basin.Petrography, petrogeochemistry and zircon U-Pb dating as well as Lu-Hf isotope for the Early Mesozoic dykes in the Longmen area of the southwestern Ordos Basin are studied.The result shows that these dykes are calc-alkaline to high poassium calc-alkaline dioritic porphyrite and monzonitic porphyrite characterized by low Mg#, Cr, Ni and Co contents.They are relatively rich in REE and LILE, poor in HFSE and depleted in Nb, Ta, Ti and P.However, the LREE/HREE ratios of monzonitic porphyrite are slightly lower and with much lower Yb, Y and higher Sr, Sr/Y ratios than those of the dioritic porphyrite, indicating that the former was formed by partial melting of deeper crustal materials under relatively high pressure, while the later was the product of melting of shallow crust material under lower pressure.Both of the dioritic and monzonitic porphyrite yield 242 Ma, consisting with those magmatism during the initial compression after the Early Mesozoic ocean basin closure in the Qinling orogenic belt.Their zircon εHf(t)=-33.89~-9.73, tDM2=1564~2780 Ma, which implies that the tectonic and magmatic activity occurred in Qinling orogenic belt since the Early Mesozoic has affected the southwestern Ordos Basin.All suggested that these dykes are resulted from the partial melting of Neoarchean and Paleoproterozoic basement of the Ordos Basin at different depths under the background of northward subduction of the Mianlue ocean basin in Qinling orogenic belt, which were roughly corresponding to the early Mesozoic tectonic transition from compression to extension in the Qinling orogenic belt.Consequently, the Ordos Basin has entered into a tectonic setting from the compression to the extension at the initiation of Chang 7 Member deposition during the Late Triassic.
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Key words:
- zircon U-Pb age /
- petrogeochemistry /
- intrusive dyke /
- Ordos Basin
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图 1 鄂尔多斯盆西南部地质简图(a，据翁凯, 2012修改) 及鄂尔多斯盆地构造单元划分图(b，据杨献忠等, 2019修改)
Figure 1.
图 7 样品TAS图解(a，底图据Middlemost, 1994)、AR-SiO2图解(b，底图据Wright, 1969)、硅-钾图解(c，底图据Peccerillo et al., 1976)和A/CNK-A/NK图解(d，底图据Maniar et al., 1989)
Figure 7.
图 8 鄂尔多斯盆地西南部X井盒8段侵入岩稀土元素球粒陨石标准化配分型式(a)和微量元素原始地幔标准化蛛网图(b) (标准化数据据Sun et al., 1989)
Figure 8.
图 9 鄂尔多斯盆地西南部X井盒8段侵入岩X-3样品(a)和X-7样品(b)小于300 Ma谐和锆石稀土元素球粒陨石标准化配分型式(标准化数据据Sun et al., 1989)
Figure 9.
图 10 X-3样品和X-7样品小于300 Ma锆石La-(Sm/La)N (a，据Hoskin, 2005修改)、LaN-U(b)、∑LREE-U(c)、δEu-δCe(d)、δEu-(Sm/La)N(e)和(Sm/La)N-(Yb/Gd)N图解(f)
Figure 10.
表 1 X-3和X-7样品锆石LA-ICP-MS U-Th-Pb分析结果(铅校正后数据)
Table 1. Original LA-ICP-MS U-Pb dating results of zircons from the X-3 and X-7 samples(after lead correction)
测点号 Th/U 含量 同位素比值 校正同位素年龄/Ma 谐和度/% Th/10-6 U/10-6 206Pbc/% 207Pb/206Pb 1σ 207Pb/235U 1σ 206Pb/238U 1σ 207Pb/206Pb 1σ 207Pb/235U 1σ 206Pb/238U 1σ X-3 1 0.07 149.23 2002.03 0.23 0.05267 0.0007 0.27743 0.00282 0.03819 0.00023 237 29 241 2 241 1 100 2 0.29 333.05 1134.07 - 0.05223 0.00082 0.27514 0.00359 0.03819 0.00024 295 18 247 3 242 1 102 3 0.09 86.46 943.30 0.04 0.05217 0.00091 0.27449 0.00412 0.03815 0.00025 293 22 246 3 241 2 102 4 0.22 374.59 1703.18 - 0.05127 0.00071 0.27021 0.00294 0.03821 0.00023 253 14 243 2 242 1 100 5 0.15 308.39 2026.07 0.62 0.06147 0.00076 0.38632 0.00348 0.04557 0.00027 477 29 307 3 286 2 107 6 0.37 44.22 119.92 - 0.12554 0.00159 6.45356 0.06122 0.37276 0.00247 2036 8 2040 8 2042 12 100 7 0.08 113.28 1400.40 - 0.05243 0.00078 0.27609 0.00331 0.03818 0.00024 304 16 248 3 242 1 102 8 0.14 101.29 713.35 - 0.11713 0.00125 6.3214 0.04173 0.39133 0.00228 1913 5 2021 6 2129 11 90 9 0.94 220.73 235.98 - 0.12915 0.00147 6.89602 0.0526 0.38716 0.00237 2086 6 2098 7 2110 11 99 10 0.08 150.21 1846.43 0.16 0.05821 0.00075 0.32966 0.00321 0.04107 0.00025 491 27 284 3 259 2 110 11 0.18 687.20 3822.98 2.13 0.09276 0.00109 0.58729 0.00477 0.04591 0.00027 1111 28 394 4 283 2 139 12 0.14 409.47 2973.40 0.54 0.05721 0.00071 0.27695 0.00251 0.0351 0.00021 328 29 231 2 221 1 105 13 0.13 418.80 3317.83 1.63 0.0683 0.00085 0.25264 0.00229 0.02682 0.00016 436 34 187 2 167.9 1 111 14 0.23 167.67 716.77 0.21 0.11809 0.00129 5.10137 0.0356 0.31325 0.00185 1905 18 1824 7 1753 9 109 15 0.13 299.25 2384.48 1.62 0.06594 0.00084 0.31726 0.00298 0.03489 0.00021 340 36 228 3 218 1 105 16 0.13 487.33 3785.42 0.09 0.05228 0.00067 0.21083 0.002 0.02924 0.00017 267 28 192 2 186 1 103 17 0.30 1483.19 4865.89 1.40 0.07329 0.00092 0.24484 0.00222 0.02423 0.00014 690 34 190 2 152.2 0.9 125 18 0.28 72.21 260.18 - 0.12367 0.00146 6.08555 0.05008 0.35681 0.00222 2010 7 1988 7 1967 11 102 19 0.19 1063.90 5652.92 0.68 0.05915 0.00072 0.18713 0.00161 0.02294 0.00013 365 30 159 2 145.2 0.8 110 20 0.36 85.92 238.28 0.16 0.11712 0.00143 4.4386 0.03885 0.27482 0.00173 1895 20 1710 7 1563 9 121 21 0.49 123.85 254.54 - 0.12501 0.00144 6.06845 0.04733 0.35201 0.00215 2029 6 1986 7 1944 10 104 22 0.19 703.25 3689.50 - 0.06742 0.00084 0.30859 0.00277 0.03319 0.0002 851 9 273 2 210 1 130 23 0.12 36.55 316.34 - 0.11527 0.00131 5.38984 0.04123 0.33907 0.00205 1884 6 1883 7 1882 10 100 24 0.20 807.52 3981.17 1.28 0.0643 0.0008 0.24052 0.00218 0.02712 0.00016 383 34 185 2 170.3 1 109 25 0.18 456.79 2546.69 1.14 0.06551 0.00086 0.25317 0.00248 0.02802 0.00017 477 34 199 2 176 1 113 26 0.11 215.33 1976.10 0.44 0.05565 0.00085 0.26961 0.00338 0.03513 0.00022 294 36 228 3 222 1 103 27 1.69 338.60 200.57 - 0.12074 0.0015 5.79904 0.05292 0.34828 0.00224 1967 8 1946 8 1926 11 102 28 0.23 347.94 1527.13 - 0.05545 0.00083 0.29279 0.00358 0.03829 0.00024 430 16 261 3 242 1 108 29 0.10 145.92 1516.80 0.40 0.06894 0.00092 0.43126 0.00438 0.04536 0.00028 802 27 349 3 285 2 122 30 0.12 33.06 285.85 0.01 0.11312 0.00131 4.97977 0.0395 0.31922 0.00194 1850 7 1816 7 1786 9 104 31 1.15 38.82 33.70 0.02 0.11307 0.00248 4.92853 0.09867 0.3161 0.00309 1849 22 1807 17 1771 15 104 32 0.21 322.13 1571.22 - 0.06248 0.00091 0.31056 0.00364 0.03605 0.00022 691 15 275 3 228 1 121 33 0.11 340.26 3026.59 19.60 0.21889 0.00243 1.10534 0.00773 0.03662 0.00022 885 174 249 18 187 2 133 34 0.08 58.63 713.09 1.04 0.11083 0.00131 3.96734 0.03259 0.25958 0.00158 1683 32 1562 12 1474 9 114 35 0.14 107.11 745.51 0.23 0.11357 0.00122 4.80073 0.03214 0.30655 0.00178 1831 18 1771 6 1720 9 106 36 0.09 84.23 909.10 0.39 0.07185 0.00107 0.49371 0.00591 0.04983 0.00032 894 30 392 4 312 2 126 37 0.22 75.28 337.08 0.15 0.12401 0.00142 5.95316 0.04603 0.34812 0.00211 2000 22 1960 9 1923 10 104 38 0.13 259.99 2025.28 - 0.05265 0.00071 0.27748 0.00285 0.03822 0.00023 314 13 249 2 242 1 103 39 0.06 140.50 2306.52 0.88 0.05795 0.00078 0.29178 0.00302 0.03651 0.00022 242 33 230 3 229 1 100 40 0.08 119.79 1468.20 2.49 0.07295 0.00101 0.36819 0.00393 0.0366 0.00022 349 44 237 4 226 1 105 41 0.16 156.88 965.15 - 0.05284 0.00121 0.25631 0.00532 0.03518 0.00026 322 34 232 4 223 2 104 42 0.08 180.89 2331.01 0.52 0.0547 0.00075 0.26457 0.0028 0.03508 0.00021 223 32 221 2 221 1 100 43 0.05 39.29 801.34 - 0.11007 0.0014 3.0868 0.0284 0.20336 0.0012 1801 9 1429 7 1193 6 151 44 0.09 254.28 2858.73 4.25 0.08699 0.00125 0.4684 0.00526 0.03904 0.00024 363 62 249 6 237 1 105 45 0.53 1802.63 3420.75 0.25 0.06158 0.00093 0.33425 0.00405 0.03936 0.00024 591 43 284 4 248 2 115 46 0.97 119.59 123.09 3.23 0.1213 0.00196 4.84333 0.06432 0.28953 0.00205 1577 43 1586 17 1592 11 99 47 0.29 120.95 417.08 2.78 0.11373 0.0015 2.79877 0.0275 0.17845 0.00108 1490 34 1190 12 1031 6 145 48 0.30 106.69 350.13 - 0.12479 0.00166 5.37719 0.05356 0.31247 0.00195 2026 9 1881 9 1753 10 116 49 0.50 100.83 202.22 - 0.12564 0.00185 6.04759 0.07083 0.34904 0.00235 2038 12 1983 10 1930 11 106 50 0.08 98.08 1178.84 - 0.05406 0.00124 0.28594 0.006 0.03836 0.00027 312 53 249 5 242 2 103 51 0.30 74.14 245.00 - 0.12067 0.00175 5.6496 0.06494 0.3395 0.00224 1966 11 1924 10 1884 11 104 52 0.30 500.00 1675.56 - 0.06161 0.00114 0.3719 0.00597 0.04377 0.00028 661 23 321 4 276 2 116 53 0.25 144.01 579.19 - 0.11644 0.00146 4.91875 0.04519 0.30633 0.00184 1902 8 1805 8 1723 9 110 54 0.12 53.10 459.32 2.14 0.11892 0.00153 4.20229 0.04038 0.25624 0.00156 1684 54 1543 22 1442 9 117 X-7 1 0.45 1482.47 3330.95 0.56 0.0568 0.00074 0.24925 0.00235 0.03181 0.00018 303 39 209 3 201 1 104 2 0.24 665.17 2781.66 5.88 0.09802 0.00153 0.31892 0.00399 0.02359 0.00015 284 88 150 5 141.6 1 106 3 0.13 67.71 532.75 0.29 0.11607 0.0013 4.89957 0.03461 0.30607 0.0017 1865 17 1785 6 1717 8 109 4 0.22 479.82 2134.01 0.78 0.06394 0.00091 0.27701 0.00306 0.03141 0.00018 525 35 226 3 198 1 114 5 0.60 658.12 1096.63 - 0.11235 0.00128 3.02994 0.02191 0.19555 0.00108 1838 6 1415 6 1151 6 160 6 0.18 276.21 1497.46 - 0.05509 0.00083 0.26641 0.00321 0.03506 0.0002 416 17 240 3 222 1 108 7 0.26 736.54 2841.11 0.35 0.0575 0.00081 0.20994 0.00228 0.02647 0.00015 402 34 184 2 167.8 0.9 110 8 0.21 423.72 1991.96 1.15 0.06057 0.00105 0.24288 0.00357 0.02907 0.00018 268 49 189 3 183 1 103 9 0.44 47.82 108.16 0.29 0.12658 0.00175 6.24833 0.0667 0.35793 0.0024 2022 26 1994 11 1967 12 103 10 0.26 342.10 1297.48 0.18 0.08163 0.00104 0.55624 0.00511 0.04941 0.00028 1204 25 442 4 310 2 143 11 0.23 74.47 318.23 0.55 0.11994 0.00146 5.36167 0.0457 0.32413 0.00194 1896 21 1845 8 1801 9 105 12 0.15 192.26 1317.12 0.36 0.07826 0.00105 0.46945 0.0047 0.04349 0.00025 1082 26 378 3 273 2 138 13 0.20 115.45 563.54 3.68 0.12873 0.00145 4.61592 0.03285 0.26 0.00146 1657 37 1530 15 1441 8 115 14 0.19 227.44 1207.40 0.16 0.09638 0.00113 1.13198 0.00875 0.08517 0.00047 1532 20 761 5 526 3 145 15 0.18 70.41 385.35 - 0.11941 0.00138 5.79434 0.04411 0.35184 0.00203 1947 6 1946 7 1943 10 100 16 0.39 119.76 306.83 0.01 0.12448 0.00147 6.16808 0.04908 0.3593 0.00211 2021 7 2000 7 1979 10 102 17 0.20 338.88 1736.63 0.85 0.0672 0.001 0.34111 0.00406 0.0368 0.00022 625 36 270 4 231 1 117 18 0.09 25.20 268.15 0.67 0.11378 0.00143 3.84701 0.03469 0.24517 0.00148 1781 25 1562 10 1405 8 127 19 0.43 169.54 393.39 0.43 0.12521 0.00141 5.96263 0.0428 0.34532 0.00196 1988 20 1945 8 1905 10 104 20 0.18 105.08 592.11 0.24 0.11084 0.00143 2.64902 0.02488 0.1733 0.00105 1785 20 1301 7 1028 6 174 21 0.22 70.16 320.97 0.01 0.12334 0.00146 5.82797 0.04692 0.34262 0.00202 2005 7 1951 7 1899 10 106 22 0.23 416.49 1792.14 1.64 0.07163 0.00127 0.33627 0.00509 0.03404 0.00022 562 50 244 5 212 1 115 23 0.16 85.53 535.73 0.22 0.11117 0.00135 2.54393 0.02155 0.16593 0.00097 1792 20 1272 7 988 5 129 24 0.21 346.18 1669.99 0.30 0.05779 0.00085 0.27308 0.0032 0.03427 0.0002 429 35 236 3 217 1 109 25 0.40 207.01 513.97 - 0.12058 0.00135 6.30375 0.04544 0.37911 0.00216 1965 6 2019 6 2072 10 95 26 0.19 362.66 1938.80 0.86 0.05835 0.00095 0.2739 0.00372 0.03404 0.00021 270 43 219 3 214 1 102 27 0.31 170.82 543.82 0.52 0.12061 0.00136 3.96894 0.02897 0.23863 0.00135 1909 17 1598 6 1373 7 139 28 0.18 230.13 1293.19 1.64 0.08294 0.00111 0.52141 0.00524 0.04559 0.00027 940 32 367 4 283 2 130 29 0.08 87.14 1156.13 - 0.11035 0.00118 4.97778 0.03206 0.3271 0.00179 1805 5 1816 5 1824 9 99 30 0.20 344.82 1751.67 - 0.09081 0.00125 0.81557 0.00859 0.06512 0.00039 1443 11 606 5 407 2 149 31 0.21 275.83 1331.98 0.01 0.06458 0.00097 0.39641 0.0048 0.04451 0.00027 761 15 339 3 281 2 121 32 0.34 144.94 423.90 0.37 0.11348 0.0013 4.46582 0.03374 0.28537 0.00163 1813 18 1702 6 1613 8 112 33 0.11 173.07 1527.43 1.27 0.06344 0.00103 0.31658 0.00425 0.03619 0.00022 350 43 238 4 226 1 105 34 0.21 136.95 657.90 2.62 0.11832 0.00139 2.50813 0.02006 0.15372 0.00089 1606 26 1130 8 899 5 126 35 0.19 246.86 1282.57 - 0.05396 0.00085 0.28431 0.00367 0.03821 0.00023 369 18 254 3 242 1 105 
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表 2 X-3样品锆石原位Lu-Hf同位素分析数据
Table 2. Data from in situ Lu-Hf isotope analysis of zircon grains from the X-3 sample
测点号 年龄/Ma 176Yb/177Hf 2σ 176Lu/177Hf 2σ 176Hf/177Hf 2σ εHf(t) tDM/Ma tDM2/Ma fLu/Hf 1 242 0.059449 0.000221 0.001634 0.000008 0.282204 0.000029 -15.06 1503 1834 -0.95 2 0.040815 0.000212 0.000991 0.000006 0.282196 0.000028 -15.24 1489 1843 -0.97 3 0.003517 0.000169 0.000082 0.000004 0.281665 0.000017 -33.87 2171 2779 -1.00 4 0.050132 0.000102 0.001302 0.000006 0.282353 0.000031 -9.73 1280 1564 -0.96 7 0.031920 0.000491 0.000930 0.000012 0.281918 0.000024 -25.06 1871 2338 -0.97 28 0.073503 0.000424 0.001974 0.000015 0.282325 0.000036 -10.82 1343 1619 -0.94 38 0.054996 0.000331 0.001349 0.000006 0.282192 0.000028 -15.44 1509 1853 -0.96 50 0.040347 0.000067 0.001131 0.000003 0.282278 0.000034 -12.36 1380 1698 -0.97
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表 3 样品主量、微量和稀土元素分析结果
Table 3. Analysis result of major, trace and rare earth elements of the samples
样号 X-2 X-3 X-5 X-6 X-7 样号 X-2 X-3 X-5 X-6 X-7 深度/m 3706.5 3703.3 3656.7 3655.8 3654 深度/m 3706.5 3703.3 3656.7 3655.8 3654 岩性 闪长玢岩 二长玢岩 岩性 闪长玢岩 二长玢岩 SiO2 61.29 59.36 65.72 66.16 66.11 Ce 141.8 164.1 53.6 51.6 51.2 TiO2 0.30 0.35 0.21 0.21 0.23 Pr 15.83 18.40 5.72 5.53 5.46 Al2O3 18.59 18.08 18.22 18.22 18.12 Nd 59.9 70.1 20.8 20.4 19.9 TFe2O3 5.04 5.15 2.68 2.64 2.83 Sm 10.36 12.07 3.51 3.44 3.34 MnO 0.15 0.16 0.09 0.10 0.10 Eu 2.62 3.11 1.06 1.04 1.01 MgO 0.57 0.42 0.49 0.53 0.58 Gd 7.91 9.51 2.52 2.48 2.46 CaO 6.65 5.62 3.03 2.45 3.36 Tb 1.06 1.29 0.36 0.35 0.34 Na2O 4.14 4.45 5.78 5.87 6.82 Dy 5.10 6.25 1.86 1.84 1.81 K2O 3.22 6.30 3.70 3.76 1.79 Ho 0.90 1.11 0.35 0.35 0.34 P2O5 0.07 0.10 0.06 0.06 0.06 Er 2.45 3.04 1.03 1.02 1.00 总和 100 100 100 100 100 Tm 0.35 0.43 0.16 0.15 0.15 烧失量 8.19 3.38 3.00 3.16 5.61 Yb 2.21 2.67 1.01 1.00 0.96 σ 2.96 7.07 3.96 4.00 3.21 Lu 0.33 0.40 0.15 0.15 0.14 A/CNK 0.83 0.74 0.96 1.00 0.94 Hf 6.44 5.98 3.96 3.81 3.75 A/NK 1.81 1.28 1.35 1.33 1.38 Ta 1.10 1.27 1.16 1.18 1.15 AR 1.82 2.66 2.61 2.74 2.34 W 180 286 301 296 372 Na2O+K2O 7.36 10.76 9.48 9.63 8.61 Pb 62.5 78.1 57.8 63.5 87.0 K2O/Na2O 0.78 1.42 0.64 0.64 0.26 Th 28.0 27.1 11.4 11.1 11.1 Mg# 20.8 16.1 30.0 31.7 32.4 U 15.35 12.59 6.93 6.96 6.71 V 37.4 50.2 16.8 18.4 15.5 ∑REE 326 380 121 117 116 Cr 7.13 11.4 13.2 14.2 11.5 LREE/HREE 15.1 14.4 15.3 14.9 15.0 Co 36.5 73.1 79.0 79.3 73.8 ∑LREE 306 355 114 110 108 Ni 1.91 2.90 5.65 5.20 3.85 ∑HREE 20.31 24.70 7.44 7.35 7.21 Cu 0.63 3.23 1.21 1.31 2.63 (La/Yb)N 24.4 23.5 20.5 19.8 20.6 Zn 94.8 101.3 66.5 71.0 69.6 (La/Sm)N 4.70 4.67 5.34 5.19 5.31 Rb 103.4 145.6 84.7 85.3 62.2 (Gd/Lu)N 3.00 2.95 2.02 2.11 2.10 Sr 502 2043 1297 1501 369 δEu 0.85 0.86 1.04 1.04 1.03 Y 26.00 32.37 10.07 10.12 9.76 Sr/Y 19.3 63.1 128.8 148.3 37.8 Zr 282 259 167 161 154 Y+Nb 46.5 54.4 26.0 26.5 26.1 Nb 20.5 22.1 15.9 16.4 16.4 Nb/Ta 18.6 17.4 13.7 13.9 14.2 Ba 329 2799 1411 1565 133 Zr/Hf 43.8 43.3 42.2 42.1 41.0 La 75.3 87.3 29.0 27.6 27.5 锆石饱和温度/℃ 751 757 注：主量元素含量单位为%，微量和稀土元素含量单位为10-6。A/CNK=Al2O3/(Ca+Na2O+K2O)摩尔数分数比；A/NK=Al2O3/(Na2O+ K2O)摩尔数分数比；TFe2O3表示全铁的含量；Mg#=100×Mg/(Mg+Fe2+)，σ=K2O+Na2O)2/SiO2－43)；锆石饱和温度TZr=12900/[2.95+0.85M+ln(496000/Zr溶体)]－273.15(℃)，该计算公式据Watson et al.(1983)所提出的公式变形而来
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表 4 X-3和X-7样品小于300 Ma的谐和锆石微量元素分析结果
Table 4. Analysis results of trace elements of the less than 300 Ma concordant zircons from the X-3 and X-7 samples
测点号 La Ce Pr Nd Sm Eu Gd Tb Dy Ho Er Tm Yb Lu Ti Y Nb Hf ∑REE ∑LREE (Sm/La)N (Yb/Gd)N δEu 1 6.55 22.3 2.41 13.0 6.38 1.83 24.5 8.38 103 40.3 191 41.4 404 73.2 2.60 1418 6.45 6626 939 52.4 1.51 19.9 0.39 2 59.3 184 24.8 115 28.7 2.76 40.0 9.30 89.5 31.5 138 28.1 250 41.3 2977 1071 25.2 5940 1043 415 0.75 7.56 0.25 3 0.56 5.61 0.23 1.69 2.25 0.71 12.9 4.74 60.2 24.6 120 26.4 261 46.9 8.68 853 2.51 6159 567 11.0 6.27 24.4 0.31 4 0.08 18.3 0.13 1.48 2.44 0.94 12.9 4.16 50.7 20.7 102 22.8 231 42.1 2.55 740 1.59 6216 509 23.3 47.2 21.6 0.41 5 1.26 15.3 0.48 2.98 3.62 1.29 20.3 7.07 86.6 34.6 167 36.8 363 64.3 5.70 1221 3.85 7057 805 25.0 6.16 21.7 0.38 7 2.73 10.2 1.06 5.57 3.48 1.08 16.2 5.89 72.7 29.5 144 32.5 326 60.5 3.45 1026 3.29 6377 712 24.1 1.97 24.3 0.37 10 0.86 6.62 0.38 3.23 3.42 1.24 18.5 6.95 86.9 34.8 171 38.0 385 71.2 2.23 1213 3.08 6346 827 15.7 0.85 25.2 0.04 12 1.10 13.6 0.60 3.64 5.04 1.79 28.0 9.57 112 43.3 202 43.6 414 72.6 41.3 1493 5.59 6409 951 25.7 7.10 17.9 0.37 15 4.41 31.6 3.03 28.8 19.0 6.31 41.4 11.6 124 44.6 202 42.7 408 71.9 4.64 1509 7.18 6016 1040 93.1 6.68 11.9 0.67 16 21.2 66.9 8.12 46.8 18.6 5.51 37.9 10.3 107 39.1 173 36.5 351 62.1 3.38 1330 7.70 6888 985 167 1.36 11.2 0.62 19 26.7 95.6 10.6 65.7 30.0 8.72 79.7 23.4 245 84.8 356 70.5 639 104 5.92 2784 13.8 6917 1840 237 1.74 9.70 0.51 24 23.9 120 12.1 83.1 38.2 15.2 61.1 15.0 147 50.8 220 45.2 422 69.8 25.2 1699 10.2 6351 1324 293 2.48 8.35 0.96 26 0.49 5.89 0.29 3.00 3.13 1.46 16.7 5.90 72.4 27.8 128 27.6 265 47.1 3.05 935 3.11 6360 605 14.3 9.87 19.2 0.49 28 0.42 23.5 0.40 4.27 4.54 1.49 18.4 6.21 74.0 29.7 144 31.9 321 58.8 21.4 1037 3.46 5548 718 34.6 16.9 21.0 0.43 38 1.28 9.07 0.55 4.25 4.24 2.09 22.4 7.55 88.4 33.5 154 32.9 314 56.3 2.48 1126 3.24 5419 731 21.5 5.13 17.0 0.53 39 5.36 24.3 2.64 20.3 11.4 4.01 25.8 7.73 88.2 33.9 160 36.1 359 68.1 3.18 1161 6.61 6129 848 67.9 3.29 16.9 0.69 40 3.26 15.3 1.44 11.8 7.76 2.52 23.8 6.98 72.8 24.6 103 21.0 202 35.9 3.67 825 4.45 6919 532 42.1 3.69 10.3 0.52 41 2.82 12.2 1.01 6.55 6.21 2.38 27.7 9.62 113 42.5 193 41.4 410 75.7 4.43 1351 2.47 6251 944 31.2 3.41 17.9 0.47 42 1.28 9.16 0.92 8.81 9.50 4.14 41.1 13.5 148 52.2 226 46.8 442 78.4 95.3 1777 5.62 5872 1081 33.8 11.5 13.0 0.55 44 27.1 64.4 7.04 30.6 10.4 8.28 35.2 7.90 56.1 12.4 35.57 5.58 44.8 6.96 322 460 7.51 5789 352 148 0.60 1.54 1.19 50 0.19 2.79 < 0.12 1.50 4.18 2.10 22.5 7.80 83.5 29.3 118 23.1 208 36.9 5.12 948 3.09 5505 540 10.8 35.0 11.2 0.53 1 3.08 39.2 1.37 12.0 14.8 3.79 60.4 18.5 203 70.8 311 62.9 589 87.4 6.15 2415 14.7 5476 1477 74.3 7.46 11.8 0.33 2 22.4 84.8 8.26 50.4 23.2 9.02 43.4 12.2 125 43.9 194 41.5 414 65.0 586 1505 24.6 7712 1138 198 1.60 11.5 0.86 6 9.60 30.9 2.71 12.5 4.69 0.78 15.5 5.16 60.6 23.8 116 26.9 291 50.2 5.06 816 4.88 6805 650 61.2 0.76 22.7 0.25 7 12.3 45.2 2.88 21.2 19.2 7.24 58.1 15.9 163 55.1 239 48.6 454 65.2 5.33 1931 14.0 6042 1206 108 2.42 9.44 0.61 8 6.13 25.0 1.43 10.1 9.50 3.40 28.9 8.50 95.8 36.3 167 36.9 386 61.8 5.91 1261 8.04 6981 877 55.6 2.40 16.1 0.58 24 14.1 43.0 4.22 19.9 6.89 1.20 20.3 6.93 84.3 33.8 167 38.6 414 73.2 3.78 1201 6.85 7319 928 89.3 0.76 24.7 0.29 26 12.0 42.6 3.81 18.7 7.00 1.14 18.5 6.03 68.9 26.6 126 28.8 299 52.4 14.2 869 5.73 6999 711 85.2 0.91 19.5 0.29 33 0.50 5.74 0.23 1.60 2.38 0.64 13.6 5.02 60.0 23.1 109 24.6 262 42.0 3.05 752 3.77 6640 551 11.1 7.43 23.4 0.27 35 0.11 6.06 0.11 1.39 3.56 0.99 19.8 6.88 82.2 31.1 143 31.2 311 50.7 2.97 1049 2.84 5776 688 12.2 50.1 19.0 0.28 注：微量元素含量单位为10-6; 上部测点号1~50为X-3样品，下部测点号1~35为X-7样品
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