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黏黏的小绿
我是史蒂夫
黏黏的小绿
黏黏的小绿
我是史蒂夫同位素比值 年龄(Ma)
含量(×10-6)
207Pb206Pb 1sigma 207Pb235U 1sigma 206Pb238U 1sigma 207Pb206Pb 1sigma 207Pb235U 1sigma 206Pb238U 1sigma
JJZ12-08-127 36 0.75 0.1020 0.0007 4.0739 0.0445 0.2893 0.0024 1661.1 12.2 1649.1 8.9 1638.3 12.1 99%
JJZ12-08-218 22 0.84 0.1017 0.0007 3.9392 0.0534 0.2809 0.0035 1657.4 17.4 1621.8 11.0 1596.0 17.5 98%
JJZ12-08-329 55 0.53 0.1087 0.0006 4.5919 0.0399 0.3065 0.0022 1776.9 9.3 1747.8 7.2 1723.6 11.0 98%
JJZ12-08-477 110 0.70 0.1127 0.0006 4.9630 0.0454 0.3197 0.0027 1843.5 9.4 1813.0 7.7 1788.0 13.2 98%
JJZ12-08-522 30 0.72 0.1136 0.0010 5.2077 0.0818 0.3330 0.0049 1857.1 15.3 1853.9 13.4 1853.1 23.8 99%
JJZ12-08-779 130 0.61 0.1127 0.0009 4.9049 0.0545 0.3162 0.0028 1842.9 14.0 1803.1 9.4 1770.9 13.5 98%
JJZ12-08-873 119 0.62 0.1676 0.0011 10.6538 0.1263 0.4612 0.0044 2600.0 11.1 2493.4 11.0 2444.9 19.3 98%
JJZ12-08-954 110 0.49 0.1471 0.0013 8.4317 0.2111 0.4159 0.0096 2313.3 15.4 2278.6 22.7 2241.7 43.8 98%
JJZ12-08-1059 83 0.70 0.1595 0.0014 9.7177 0.1270 0.4426 0.0045 2450.3 14.8 2408.4 12.0 2362.2 20.0 98%
JJZ12-08-1187 159 0.55 0.1133 0.0014 5.1959 0.0984 0.3328 0.0040 1853.7 22.2 1852.0 16.1 1851.9 19.1 99%
JJZ12-08-1248 58 0.83 0.1603 0.0017 10.1790 0.1378 0.4616 0.0036 2458.9 18.5 2451.2 12.5 2446.4 16.1 99%
JJZ12-08-1429 119 0.24 0.0969 0.0010 3.4760 0.0884 0.2608 0.0063 1564.8 18.7 1521.8 20.1 1494.0 32.3 98%
JJZ12-08-15185 206 0.89 0.1095 0.0010 4.8003 0.0875 0.3184 0.0051 1791.7 16.7 1785.0 15.3 1781.8 24.7 99%
JJZ12-08-16118 186 0.63 0.1477 0.0015 9.2073 0.1283 0.4531 0.0042 2320.4 18.4 2358.8 12.8 2408.9 18.8 97%
JJZ12-08-1732 39 0.81 0.1038 0.0017 4.2954 0.0917 0.3002 0.0037 1694.4 29.6 1692.5 17.6 1692.5 18.5 99%
JJZ12-08-1872 75 0.97 0.1078 0.0027 4.6215 0.1666 0.3074 0.0040 1764.8 46.3 1753.2 30.1 1727.9 19.7 98%
JJZ12-08-1991 74 1.23 0.1070 0.0024 4.6141 0.1394 0.3131 0.0051 1750.0 42.1 1751.8 25.2 1755.9 25.2 99%
JJZ12-08-2029 122 0.24 0.1069 0.0016 4.4203 0.1112 0.3007 0.0069 1746.6 26.7 1716.1 20.8 1694.8 34.4 98%
JJZ12-08-2184 72 1.17 0.1072 0.0022 4.4818 0.1323 0.3026 0.0042 1751.5 38.7 1727.6 24.5 1704.4 20.8 98%
JJZ12-08-22100 77 1.29 0.1074 0.0021 4.4894 0.1257 0.3032 0.0055 1766.7 34.9 1729.0 23.3 1707.3 27.1 98%
JJZ12-08-2360 126 0.48 0.1134 0.0024 5.1677 0.1370 0.3309 0.0051 1854.0 37.5 1847.3 22.6 1842.7 24.7 99%
JJZ12-08-24123 190 0.65 0.1128 0.0034 4.8105 0.2675 0.3089 0.0079 1855.6 54.2 1786.7 46.8 1735.3 38.8 97%
JJZ12-08-25136 99 1.38 0.1068 0.0018 4.4178 0.1083 0.2999 0.0049 1746.3 31.0 1715.7 20.3 1690.6 24.2 98%
JJZ12-08-2647 34 1.37 0.1076 0.0014 4.4687 0.0898 0.3003 0.0038 1761.1 23.3 1725.2 16.7 1692.9 18.8 98%
JJZ12-08-27184 153 1.21 0.1130 0.0017 5.1314 0.1384 0.3284 0.0061 1850.0 27.8 1841.3 22.9 1830.8 29.6 99%
JJZ12-08-28130 82 1.59 0.1706 0.0029 11.4750 0.4184 0.4830 0.0104 2564.8 28.4 2562.5 34.1 2540.4 45.4 99%
JJZ12-08-29202 191 1.06 0.1155 0.0011 5.4194 0.0923 0.3396 0.0047 1888.0 16.5 1887.9 14.6 1884.9 22.6 99%
JJZ12-08-3094 67 1.40 0.1131 0.0013 5.0131 0.0601 0.3210 0.0022 1850.0 20.1 1821.5 10.2 1794.5 10.6 98%
JJZ12-08-3165 40 1.62 0.1068 0.0024 4.2564 0.1065 0.2893 0.0097 1746.3 40.7 1685.0 20.6 1637.8 48.4 97%
JJZ12-08-3266 63 1.06 0.1608 0.0013 10.3229 0.0871 0.4647 0.0022 2464.5 13.3 2464.2 7.8 2460.3 9.9 99%
JJZ12-08-33220 146 1.51 0.1585 0.0010 10.3877 0.1868 0.4743 0.0077 2439.8 11.1 2470.0 16.7 2502.3 33.9 98%
JJZ12-08-3446 36 1.26 0.1071 0.0008 4.5552 0.0545 0.3083 0.0033 1750.3 14.0 1741.1 10.0 1732.2 16.2 99%
JJZ12-08-3685 76 1.13 0.1125 0.0016 5.0486 0.1121 0.3235 0.0036 1842.6 59.4 1827.5 18.8 1806.8 17.5 98%
JJZ12-08-37161 97 1.67 0.1128 0.0015 5.0752 0.3772 0.3252 0.0204 1855.6 24.4 1832.0 63.1 1815.1 99.3 99%
JJZ12-08-3852 53 0.98 0.1123 0.0019 4.8643 0.1106 0.3127 0.0039 1838.9 63.4 1796.1 19.2 1754.1 19.3 97%
JJZ12-08-3969 72 0.95 0.1387 0.0019 7.8212 0.1502 0.4085 0.0058 2210.8 24.1 2210.6 17.3 2208.2 26.5 99%
JJZ12-08-40134 169 0.79 0.1359 0.0010 7.5226 0.1014 0.4007 0.0045 2175.6 11.6 2175.7 12.1 2172.2 20.5 99%
JJZ12-08-41123 61 2.01 0.1230 0.0016 6.0861 0.1606 0.3601 0.0097 1999.7 22.5 1988.3 23.0 1982.4 45.9 99%
JJZ12-08-42231 218 1.06 0.1185 0.0025 5.7348 0.1758 0.3488 0.0057 1944.5 37.0 1936.6 26.5 1928.9 27.4 99%
JJZ12-08-4335 46 0.77 0.1098 0.0014 4.7007 0.0833 0.3106 0.0051 1798.2 23.3 1767.4 14.8 1743.5 25.1 98%
JJZ12-08-4548 40 1.19 0.1086 0.0008 4.7488 0.0459 0.3170 0.0021 1775.9 15.0 1775.9 8.1 1775.0 10.5 99%
JJZ12-08-46104 109 0.95 0.1205 0.0015 5.7963 0.1210 0.3457 0.0027 1964.8 22.2 1945.9 18.1 1914.2 13.0 98%
JJZ12-08-4735 38 0.94 0.1461 0.0013 8.2482 0.1207 0.4090 0.0049 2301.9 14.8 2258.6 13.3 2210.4 22.5 97%
JJZ12-08-48168 118 1.42 0.1744 0.0009 11.5079 0.0789 0.4778 0.0021 2611.1 8.6 2565.2 6.4 2517.5 9.0 98%
JJZ12-08-49120 126 0.95 0.1193 0.0009 5.6854 0.0536 0.3453 0.0024 1946.0 13.0 1929.2 8.1 1911.9 11.3 99%
JJZ12-08-5096 72 1.33 0.1668 0.0008 11.0026 0.0876 0.4784 0.0036 2525.6 41.5 2523.4 7.4 2520.2 15.5 99%
JJZ12-08-5160 77 0.77 0.1441 0.0007 7.8826 0.1405 0.3964 0.0069 2276.9 8.0 2217.7 16.1 2152.5 31.9 97%
JJZ12-08-5228 20 1.45 0.1134 0.0010 5.1375 0.1253 0.3279 0.0073 1855.3 16.2 1842.3 20.7 1828.2 35.7 99%
JJZ12-08-5334 81 0.42 0.1161 0.0016 5.4746 0.0953 0.3411 0.0029 1898.2 24.5 1896.6 14.9 1892.2 14.1 99%
JJZ12-08-54221 198 1.11 0.1153 0.0011 5.4113 0.0904 0.3398 0.0044 1887.0 -15.6 1886.7 14.3 1885.7 21.2 99%
JJZ12-08-5578 103 0.76 0.1167 0.0021 5.5230 0.1333 0.3399 0.0026 1906.5 32.6 1904.2 20.7 1886.1 12.6 99%
JJZ12-08-5664 87 0.73 0.1228 0.0013 6.1549 0.0853 0.3625 0.0033 1998.2 18.7 1998.1 12.1 1993.9 15.6 99%
JJZ12-08-5726 41 0.63 0.1156 0.0015 5.3538 0.0809 0.3354 0.0032 1900.0 23.5 1877.5 12.9 1864.7 15.3 99%
JJZ12-08-5828 28 1.00 0.1724 0.0014 11.3357 0.1600 0.4754 0.0053 2581.2 13.1 2551.1 13.2 2507.3 23.0 98%
JJZ12-08-5932 46 0.68 0.1136 0.0012 5.1278 0.0840 0.3268 0.0042 1857.1 19.0 1840.7 13.9 1822.8 20.4 99%
JJZ12-08-6029 26 1.14 0.1604 0.0014 9.8391 0.1345 0.4439 0.0050 2461.1 10.2 2419.8 12.6 2367.9 22.5 97%
JJZ12-08-61155 169 0.92 0.1131 0.0008 4.9137 0.0642 0.3143 0.0035 1849.7 11.9 1804.6 11.0 1761.7 17.2 97%
JJZ12-08-6229 35 0.84 0.1675 0.0013 11.0509 0.1592 0.4776 0.0063 2533.0 12.7 2527.4 13.4 2516.7 27.6 99%
JJZ12-08-635 8 0.69 0.1542 0.0030 9.1326 0.3802 0.4340 0.0184 2394.4 33.3 2351.4 38.1 2323.7 82.8 98%
JJZ12-08-64147 110 1.34 0.1606 0.0010 10.2582 0.1470 0.4630 0.0066 2462.0 10.2 2458.3 13.3 2452.8 29.1 99%
JJZ12-08-6524 36 0.66 0.1082 0.0010 4.5830 0.0659 0.3069 0.0037 1768.8 15.6 1746.2 12.0 1725.7 18.2 98%
JJZ12-08-6629 70 0.42 0.1487 0.0011 8.5653 0.2470 0.4179 0.0126 2331.8 11.9 2292.9 26.2 2251.0 57.3 98%
JJZ12-08-67226 156 1.45 0.1075 0.0016 4.6064 0.2718 0.3101 0.0169 1766.7 26.1 1750.4 49.3 1741.2 83.1 99%
JJZ12-08-6817 15 1.11 0.1092 0.0011 4.8071 0.1437 0.3184 0.0085 1787.0 18.5 1786.1 25.1 1781.8 41.6 99%
JJZ12-08-69288 220 1.31 0.1129 0.0011 5.0766 0.2014 0.3254 0.0104 1846.6 17.8 1832.2 33.7 1815.9 50.8 99%
JJZ12-08-7043 44 0.97 0.1084 0.0010 4.6907 0.0719 0.3134 0.0040 1773.8 12.2 1765.6 12.8 1757.5 19.5 99%
JJZ12-08-71561 124 4.52 0.1132 0.0010 5.0563 0.1124 0.3238 0.0068 1850.9 15.1 1828.8 18.8 1808.4 33.3 98%
JJZ12-08-7253 73 0.73 0.1337 0.0013 7.2409 0.0882 0.3923 0.0027 2147.2 16.7 2141.6 10.9 2133.3 12.3 99%
JJZ12-08-73215 154 1.39 0.1207 0.0015 5.8922 0.0820 0.3536 0.0019 1968.5 23.3 1960.1 12.1 1952.0 8.9 99%
JJZ12-08-7452 34 1.50 0.1229 0.0009 6.0697 0.0782 0.3579 0.0038 1999.1 12.8 1985.9 11.2 1972.3 18.0 99%
JJZ12-08-75110 49 2.26 0.1581 0.0021 10.3658 0.2754 0.4751 0.0110 2435.5 22.8 2468.0 24.6 2505.9 48.2 98%
JJZ12-08-76191 146 1.31 0.1512 0.0012 8.9403 0.2431 0.4290 0.0117 2359.0 13.4 2331.9 24.8 2301.1 52.9 98%
JJZ12-08-7744 41 1.07 0.1278 0.0038 6.4375 0.3047 0.3634 0.0092 2068.2 53.1 2037.4 41.6 1998.4 43.7 98%
JJZ12-08-78124 81 1.54 0.1087 0.0015 4.7670 0.1073 0.3159 0.0034 1788.9 25.9 1779.1 18.9 1769.8 16.4 99%
JJZ12-08-7977 98 0.78 0.1126 0.0013 5.0850 0.0746 0.3277 0.0036 1842.6 20.7 1833.6 12.5 1827.4 17.4 99%
JJZ12-08-8092 194 0.48 0.1145 0.0014 5.3113 0.0751 0.3367 0.0032 1872.2 22.2 1870.7 12.1 1870.9 15.5 99%
JJZ12-08-81271 113 2.39 0.1214 0.0013 5.8860 0.0755 0.3515 0.0031 1977.5 18.8 1959.2 11.1 1942.0 14.7 99%
JJZ12-08-8280 62 1.29 0.1089 0.0010 4.7671 0.0514 0.3174 0.0023 1783.3 16.4 1779.1 9.1 1777.0 11.1 99%
JJZ12-08-83215 160 1.34 0.1127 0.0012 4.9941 0.0569 0.3214 0.0024 1842.9 18.8 1818.3 9.6 1796.8 11.8 98%
JJZ12-08-8437 25 1.49 0.1032 0.0011 4.2273 0.0876 0.2967 0.0051 1683.3 20.2 1679.3 17.0 1675.1 25.2 99%
JJZ12-08-8653 59 0.90 0.1100 0.0009 4.8650 0.0452 0.3206 0.0019 1799.1 14.8 1796.2 7.8 1792.9 9.3 99%
JJZ12-08-8736 32 1.11 0.1131 0.0012 5.1092 0.0754 0.3272 0.0033 1850.0 18.7 1837.6 12.5 1824.6 15.9 99%
JJZ12-08-88178 112 1.58 0.1608 0.0014 10.1890 0.1390 0.4586 0.0037 2464.8 14.8 2452.1 12.6 2433.5 16.6 99%
JJZ12-08-8978 85 0.92 0.1164 0.0013 5.4359 0.0639 0.3389 0.0024 1902.2 21.5 1890.5 10.1 1881.2 11.7 99%
JJZ12-08-9082 77 1.06 0.1166 0.0012 5.4477 0.0726 0.3378 0.0022 1905.6 19.6 1892.4 11.4 1876.1 10.4 99%
JJZ12-08-9195 117 0.81 0.1589 0.0011 9.9387 0.0836 0.4529 0.0025 2444.1 12.5 2429.1 7.8 2408.2 11.2 99%
JJZ12-08-9284 101 0.83 0.1134 0.0018 4.9649 0.0718 0.3179 0.0018 1854.6 27.8 1813.4 12.2 1779.2 8.6 98%
JJZ12-08-9355 87 0.63 0.1721 0.0020 11.4809 0.1934 0.4823 0.0059 2588.9 19.8 2563.0 15.7 2537.4 25.9 98%
JJZ12-08-9461 88 0.70 0.1588 0.0010 10.0174 0.0799 0.4571 0.0032 2442.9 10.5 2436.4 7.4 2426.7 14.1 99%
JJZ12-08-95169 68 2.48 0.1225 0.0012 6.0397 0.0660 0.3572 0.0023 1994.4 18.5 1981.6 9.5 1968.8 11.0 99%
JJZ12-08-9625 36 0.69 0.1064 0.0011 4.4991 0.0661 0.3062 0.0034 1738.9 23.1 1730.8 12.2 1721.9 16.8 99%
JJZ12-08-9754 108 0.50 0.1130 0.0013 4.9741 0.0909 0.3184 0.0038 1850.0 20.5 1814.9 15.4 1782.1 18.6 98%
JJZ12-08-9874 108 0.68 0.1134 0.0030 4.9893 0.1581 0.3184 0.0021 1854.0 48.3 1817.5 26.8 1781.8 10.3 98%
JJZ12-08-10098 149 0.66 0.1075 0.0012 4.6069 0.0625 0.3099 0.0022 1758.3 26.1 1750.5 11.3 1740.4 10.6 99%
表1 姜家寨铁矿串岭沟组碎屑锆石U-Pb年代学测试结果
Table 1 U-Pb isotopic compositions of zircons from Chuanlinggou Formation in Jiangjiazhai iron deposit
姜家寨宣龙式铁矿串岭沟组底部砂页岩典型碎屑锆石阴极发光照片与年龄数据
Fig.3 Ages and cathodoluminescence images of zircons from the lower part of the Chuanlinggou Formation in Jiangjiazhai iron deposit
锆石Th/U-年龄图解
Fig.4 Diagram of Th/U vs. age of zircons from the Chuanlinggou Formation
碎屑锆石年龄测试结果通过线性概率和概率密度分析(图5)，识别出三组主要峰值年龄，对他们进行加权平均年龄计算得出：(1) 9.1Ma，加权平均年龄为.9Ma(n=21，MSWD=0.72)；(2) 7.1Ma，加权平均年龄为.8Ma(n=22，MSWD=0.08)；(3) 4.8Ma，加权平均年龄为.8Ma(n=10，MSWD=0.71)(图5、图6)。此外，碎屑锆石年代学测试显示，在6.5Ma，9.7Ma出现较小峰值，少量锆石年龄散布于4.4Ma及1.11Ma(图5)。测试结果中存在4颗较年轻的岩浆成因碎屑锆石谐和年龄： JJZ12-08-2，.4Ma；JJZ12-08-1，.2Ma；JJZ12-08-84，.2Ma和JJZ12-08-17，.6Ma。4颗锆石CL图像显示锆石环带发育，测试位置位于锆石幔部，为岩浆锆石年龄。
姜家寨铁矿串岭沟组碎屑锆石年龄概率分布图(a)和线性概率图(b)
Fig.5 Probability density map (a) and linear probability plots (b) of ages of zircons from the Chuanlinggou Formation in Jiangjiazhai iron deposit
姜家寨铁矿串岭沟组碎屑锆石三组主要峰值年龄谐和图
Fig.6 Concordia plots for the three major age peaks of detrital zircons from the Chuanlinggou Formation in Jiangjiazhai iron deposit
4.1 串岭沟组年龄及对成矿时代的约束
近年来，随着高精度锆石年代学测试技术的发展，对华北克拉通中元古代地层的年代学研究有了快速的发展，得到了许多重要的年代学数据(图7)，尤其是对中元古代的地层的时代界限有了新的认识(；)。
、、对侵入密云群的环斑花岗岩进行的年代学研究得到其形成时代为Ma，由此推断其不整合上覆的常州沟组沉积岩形成时代应不早于1673Ma。测得蓟县侵入串岭沟组的辉绿岩形成时代为1638±14Ma。测得蓟县青山岭侵入串岭沟组闪长玢岩脉锆石年龄为1634±9Ma。此外，测得串岭沟组上部凝灰岩形成时代为1621±12Ma，此数据略小于前人获得的侵入串岭沟组岩脉的年龄，在误差范围内与其相似。根据上述研究，可以初步限定串岭沟组的形成时代应处于Ma之间。
本次研究，通过对串岭沟组底部砂页岩碎屑锆石U-Pb年代学研究，获得了4颗较年轻的岩浆锆石谐和年龄(JJZ12-08-2，.4Ma；JJZ12-08-1，.2Ma；JJZ12-08-84，.2Ma和JJZ12-08-17，.6Ma)，进一步的限定了串岭沟组的形成下限，其形成时代不早于1657Ma。串岭沟组的形成时代应处于阈值Ma之间，与推测的串岭沟组沉积的年龄(16.5~16.4亿年)一致。同时，结合本地区常州沟组地层的厚度，本次研究获得的数据亦支持提出的对长城系地层年代学的修改建议，长城系开始的时间应晚于1673Ma，可能为推测的16.6亿年。
如上所述，串岭沟组下部砂页岩是宣龙式铁矿床的赋矿层位，对姜家寨铁矿床赋矿围岩的研究约束了其形成时代，同时也制约了铁矿床的形成时代。宣龙式铁矿床的形成时代小于或接近于1657Ma。
4.2 对华北克拉通演化的指示
华北克拉通是全球最古老的克拉通之一， 经历了多阶段的构造演化和强烈的变质改造，目前对华北克拉通的形成时间以及演化过程仍然存在争议，主要有以下三种认识：(1)华北克拉通在太古代已开始形成陆核，然后由多个独立块体拼贴而成(；；；，；)，进一步的研究认为华北克拉通在新太古代末(2.5Ga)，微陆块被火山-沉积岩系焊接，随后发生变质作用和花岗岩化，完成稳定大陆的克拉通化，古元古代(1.85Ga)经历了一次挤压构造事件(；)；(2)华北克拉通东、西块体约于 2.5Ga 左右碰撞拼合(；；；)；(3)华北克拉通西部陆块与东部陆块沿中部带发生碰撞拼合，在1.85Ga形成现今统一的华北克拉通结晶基底(，，；； ；，，；；；；)。另有研究认为板块构造主导了古元古代的地壳运动和地幔相互作用，华北克拉通是Columbia超大陆的组成部分(； ；； ，；；；)。
本文研究获得的华北克拉通中部带串岭沟组底部砂页岩中两组峰值年龄2.45Ga和 1.85Ga，分别清楚地记录了太古代晚期(2.5Ga左右)华北克拉通深变质作用和花岗岩化的时代和古元古代(1.85Ga)挤压构造事件或统一的华北克拉通结晶基底形成时代。尽管目前对克拉通拼合时间以及构造演化方式的争议依然存在，但1.8Ga之前的这两次重要的构造-热事件的形成时代在越来越多的得到了精确的趋同的年代学数据的证实(；；；； ；；；，；；；；;)。
华北克拉通长城系地层锆石U-Pb年代学制约
Fig.7 Zircon U-Pb age constraints on the Changcheng System strata in the NCC
华北克拉通在1.85~1.7Ga期间进入伸展构造体制(；)，内部及边部发生了拉张，抬升等地质事件，以富镁基性岩墙、斜长岩-辉长岩-纹长二长岩-环斑花岗岩以及A型花岗岩和富钾火山岩广泛发育为特征，形成时代集中于18~16亿年，对应于古元古代末-中元古代初Columbia全球性的非造山岩浆活动，是一次超大陆裂解事件(；，；；；；；；；，；； ，；，，；；)。
研究认为古元古代基性岩墙群均匀的分布在华北克拉通的各个地区，不同地区岩墙的展布特征有所不同，根据变质情况将其分为2类，一类遭受了高压麻粒岩-麻粒岩相变质作用，另一类未变质。其具有大陆碱性玄武岩和橄榄玄武岩的特征，富集Fe-Ti副矿物，有富集地幔的源区特征。变质岩墙多形成于或变质于Ma，未变质的岩墙多形成于Ma(；)。通过地质地球化学特征对比研究认为，晋冀蒙交界地区高密度发育的基性岩墙群可划分为三组：S-Ⅰ岩群NNW向展布，相对低FeO-TiO2-P2O5，成分相当于高MgO拉斑玄武岩；S-ⅡNNW向展布，岩墙高FeO-TiO2-P2O5，表现为Fenner趋势，由碱性到亚碱性高Fe玄武岩组成；S-EW岩墙EW向展布，表现为Bowen趋势，高Fe拉斑玄武岩和安山岩。他们都经历过壳幔的混染作用，而Fenner和Bowen趋势同时出现与峨眉山大火山岩省的特征类似，源于深部地幔，亦表明了拉张构造环境的特征。Lu et al.(2008)对富镁基性岩墙、斜长岩-辉长岩-纹长二长岩-环斑花岗岩以及A型花岗岩和富钾火山岩形成年代学数据总结研究提出在1.8~1.6Ga时间内华北克拉通的拉张事件可分为三幕(时期)：1.78Ga、1.70Ga和1.62Ga。
在这一时期中(1720Ma前后)，以河北大庙地区为代表，发育有典型的矿浆型钒钛磁铁矿-磷灰石矿床。年代学和地球化学研究得出大庙斜长杂岩体中苏长岩(辉长岩)与大庙式钒钛磁铁矿-磷灰石铁矿具有同源特征，铁矿床的形成与斜长岩-苏长岩-辉长岩杂岩体有着密切的联系，是同一幔源岩浆不同演化阶段的产物(；；；)。
本文对姜家寨铁矿床串岭沟组砂页岩碎屑锆石年代学的研究中，测试得到1774.1Ma的峰值年龄与基性岩墙群一致，记录并证实了1.8Ga后在华北克拉通中部带发生的拉张-抬升、壳幔作用和地幔上涌的地质事件，揭示了华北克拉通演化在其不同陆块间演化整体的同一性。目前，尽管对于1.8~1.6Ga发育的富镁基性岩墙、斜长岩-辉长岩-纹长二长岩-环斑花岗岩以及A型花岗岩和富钾火山岩起始时间、相互关系、成岩成矿间的相互作用仍有很多未解答的问题，但是，串岭沟组的峰值年代学数据清楚表明了这次岩浆事件在该地区活动强烈，沉积岩在形成中接受了来自华北克拉通抬升事件中产生的基性岩墙群的剥蚀产物，他们是沉积岩形成中的主要的物质来源之一，基于时间和区域的一致性，我们推断这一时期上述富含铁质的基性岩墙群也极有可能是宣龙式铁矿床中铁质的主要物源之一。
(1)对宣化姜家寨铁矿床串岭沟组铁矿体上部砂页岩进行的LA-MC-ICP-MS年代学研究，获得了三组主要的峰值年龄，加权平均值分别为.9Ma、.8Ma和.8Ma。代表了华北克拉通中部带经历的三期较为重要的地质构造、岩浆作用和变质作用事件的时间。
(2)我们获得的4颗较年轻的岩浆锆石，年龄为4.4Ma，这代表了沉积岩形成的时间下限，同时制约了姜家寨宣龙式铁矿床的形成时代不早于1657Ma。
(3)形成于17~18亿年的富铁基性岩墙群是串岭沟组的主要物源之一，其也可能是宣龙式铁矿床中铁质的主要物源之一。
致谢 本文在野外地质调查期间得到了河北省地勘局第三地质大队的热情帮助和支持；审稿专家对本文提出了修改意见和下一步工作的建议；在此一并致以衷心的感谢。
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