36 2 2017 3 GeologicalScienceandTechnologyInformation Vol.36 No.2 Mar. 2017 doi:10.19509/j.cnki.dzkq.2017.0201,,,. : U-Pb [J].,2017,36(2):1-12. : U-Pb 1, 2, 1, 1, 1 (1., 264000;2. ( ), 430074) :, SiO 2,Na 2O CaO TiO 2 ;, Eu U-Pb 1000~700, 2500~1800 Ma2, -, 2500 Ma,2, 437~435 Ma,,, : ; ; ;U-Pb :P588.14 :A :1000-7849(2017)02-0001-12,, U-Pb,,, [1-8] [9] 1, [10] ;, -, [11] - ; [20],,, [12], ;,,,, [13] ; U-Pb [21],,, [14] ;, U-Pb -, [22] -,, -, ( 1) [15-19] :2016-09-10 : : (DD20160079) : (1988 ),,, E-mail:717104997@qq.com : (1969 ),,, E-mail:BZYang@cug.edu.cn

2 : U-Pb 3 3 PM02 Fig.3 SedimentaryinterlayersandthesampleslocationsofPM02sectioninKepingtageFormation + +7 + + + NIST610 1.90%, (CaO)=0.35% ~2.10% ( 02-9 30 (CaO), 6.48%), (K 2O)=0.63% ~ s, 10s, 2s, 2.56%, 1.11%~7.40% 60s 02-54 (Fe 2O 3+MgO) 5.19%, ICPMSDataCal [24] 3.28%, 02-9 Al 2O 3 CaO K 2O ( 17.45%) ( 3 3.1 10.69%), 1 3.2 (SiO 2 ) 67.28% ~92.58% ( 79.43%) 1 (Fe 2O 3 )=0.58%~1.83%, (MgO)=0.42%~ ( 4-a), 4 [25]; [26] (a) (b) Fig.4 Chondrite-normalized(a)andUCC(uppercontinentcrust)-normalized(b)REEpaternsofsandstoneinKepingtageFormation

4 2017 Table1 1 MjorandtraceelementsdateofsandstonefromtheKepingtageFormation 02-8 02-9 02-10 02-12 02-14 02-20 02-24 02-26 02-28 02-32 02-34 02-36 02-42 02-49 02-50 02-52 02-54 02-62 02-68 02-70 SiO2 81.43 67.28 79.95 84.41 74.80 74.51 74.19 81.24 81.74 73.85 81.37 92.58 79.75 76.41 75.08 81.85 75.26 82.19 84.60 86.20 Al2O3 7.79 9.24 7.93 4.99 10.56 10.73 8.57 7.56 8.08 11.96 8.52 2.96 8.71 10.47 11.24 6.85 10.19 7.32 5.90 5.88 TiO2 0.37 0.41 0.36 0.25 0.48 0.54 0.46 0.46 0.40 0.55 0.40 0.15 0.39 0.50 0.53 0.30 0.45 0.32 0.34 0.33 Fe2O3 1.03 1.42 1.29 1.09 1.64 1.83 1.56 1.24 1.02 1.43 0.97 0.58 1.10 1.82 1.28 0.91 1.46 0.88 0.94 0.91 FeO 2.28 1.98 2.85 1.30 3.05 2.98 2.88 2.62 1.80 2.77 1.88 0.82 1.97 1.82 2.37 1.68 3.68 2.18 1.65 0.88 CaO 0.55 6.48 0.59 2.10 0.71 0.74 2.03 0.68 0.47 0.38 0.37 0.35 0.95 0.72 0.70 1.80 0.58 0.79 1.12 0.83 MgO 1.19 1.31 1.31 0.76 1.62 1.63 1.90 1.20 0.95 1.67 1.16 0.42 1.18 1.49 1.53 0.91 1.51 0.91 0.79 0.66 K2O 1.58 1.73 1.56 0.90 1.83 2.02 1.64 1.30 1.50 2.43 1.93 0.63 1.64 2.45 2.56 1.39 1.87 1.19 0.94 1.21 Na2O 1.07 1.91 1.11 0.76 1.79 1.53 1.12 1.14 1.64 1.92 1.09 0.28 1.75 1.37 1.67 1.12 1.63 1.35 1.07 1.04 MnO 0.073 0.624 0.079 0.278 0.099 0.114 0.485 0.056 0.053 0.053 0.038 0.046 0.061 0.099 0.082 0.173 0.093 0.102 0.102 0.066 P2O5 0.110 0.113 0.141 0.087 0.120 0.123 0.154 0.092 0.076 0.158 0.132 0.042 0.100 0.148 0.137 0.109 0.099 0.047 0.059 0.075 2.22 7.40 2.69 2.97 2.98 3.09 4.70 2.31 2.00 2.74 2.07 1.11 2.30 2.59 2.74 2.80 2.99 2.34 2.29 1.79 99.70 99.92 99.87 99.89 99.69 99.84 99.69 99.89 99.72 99.91 99.93 99.96 99.90 99.88 99.93 99.89 99.82 99.62 99.80 99.88 La 30 35.7 36.2 24.7 25.7 39.4 35.7 39.3 24.5 45.9 42.4 23.6 32.8 41.4 49.7 27.7 44.9 22.3 29.0 43.1 Ce 72.1 63.3 75.1 52.7 59.2 79.0 77.7 73.9 52.0 84.8 79.7 44.1 61.5 76.1 94.2 56.5 96.5 53.9 64.5 85.1 Pr 9.34 7.49 8.27 6.61 7.42 9.16 9.29 8.26 6.34 9.59 8.61 4.60 7.20 9.09 11.00 7.29 11.10 6.91 7.85 9.79 Nd 37.4 28.3 31.8 26.2 29.2 34.5 36.8 30.6 24.1 34.3 31.7 15.2 26.9 34.3 41.4 29.4 41.8 27.0 29.9 37.4 Sm 6.75 5.41 6.05 5.24 5.58 6.39 7.29 5.33 4.12 5.59 5.51 1.93 4.70 6.28 7.36 5.79 6.90 4.74 5.16 6.88 Eu 1.24 1.20 1.28 1.19 1.10 1.32 1.60 1.03 0.87 1.16 1.12 0.40 1.02 1.32 1.56 1.19 1.42 1.02 1.06 1.47 Gd 5.35 5.07 5.67 4.74 4.66 5.64 6.65 4.66 3.41 5.29 4.98 1.92 4.13 5.58 6.47 4.79 5.83 3.82 4.40 6.25 Tb 0.75 0.87 0.92 0.84 0.74 0.89 1.12 0.70 0.53 0.81 0.76 0.29 0.64 0.86 1.01 0.76 0.83 0.55 0.63 0.95 Dy 3.66 5.03 4.98 4.84 4.00 4.81 6.48 3.65 2.93 4.60 4.05 1.69 3.39 4.74 5.55 3.89 4.19 2.77 3.13 4.82 Ho 0.66 0.98 0.92 0.92 0.75 0.94 1.26 0.71 0.59 0.93 0.79 0.36 0.64 0.93 1.09 0.70 0.80 0.53 0.56 0.86 Er 1.75 2.57 2.31 2.25 2.03 2.54 3.22 1.93 1.65 2.61 2.08 1.06 1.70 2.42 2.89 1.78 2.18 1.41 1.47 2.08 Tm 0.26 0.39 0.33 0.33 0.31 0.40 0.48 0.30 0.26 0.40 0.31 0.16 0.26 0.36 0.44 0.26 0.33 0.20 0.21 0.29 Yb 1.78 2.64 2.10 2.11 2.12 2.80 3.28 2.13 1.82 2.83 2.17 1.17 1.74 2.58 3.03 1.83 2.28 1.40 1.44 1.97 Lu 0.28 0.42 0.33 0.31 0.35 0.48 0.50 0.41 0.34 0.48 0.35 0.18 0.31 0.44 0.54 0.29 0.41 0.24 0.25 0.39 Th 6.09 7.39 6.51 3.80 8.47 8.29 7.29 10.80 7.14 7.42 6.90 2.50 8.27 10.40 9.27 7.48 7.69 6.94 5.59 8.82 Sc 6.94 7.43 6.85 5.71 9.30 8.80 8.15 6.88 5.95 7.35 7.39 2.80 7.59 8.96 8.10 6.08 7.45 5.61 4.20 4.64 Co 11.10 10.90 12.00 6.85 15.80 14.20 9.96 11.30 9.07 10.60 9.39 3.12 10.70 10.9 12.10 8.93 12.90 9.32 6.78 6.75 Cr 30.3 29.9 29.8 20.4 44.3 39.4 32.3 33.1 22.7 39.0 36.2 16.8 38.6 42.2 43.6 24.2 31.8 28.5 22.6 25.0 La/Sc 4.32 4.80 5.28 4.33 2.76 4.48 4.38 5.71 4.12 6.24 5.74 8.43 4.32 4.62 6.14 4.56 6.03 3.98 6.90 9.29 La/Y 1.65 1.30 1.39 0.92 1.25 1.51 1.00 2.03 1.49 1.73 1.96 2.18 1.86 1.63 1.68 1.44 2.04 1.52 1.92 1.75 Th/Sc 0.88 0.99 0.95 0.67 0.91 0.94 0.89 1.57 1.20 1.01 0.93 0.89 1.09 1.16 1.14 1.23 1.03 1.24 1.33 1.90 Sc/Cr 0.23 0.25 0.23 0.28 0.21 0.22 0.25 0.21 0.26 0.19 0.20 0.17 0.20 0.21 0.19 0.25 0.23 0.20 0.19 0.19 : %; 10-6, (LREE) (HREE) (LREE/HREE=1.14 ~13.16),Ce 02-36 ( REE) (96.65 10-6 ),, ;, -, (170.64 10-6 ), ( 2), Th/U [27] 0.06~4.69( Tw10-2 Tw62-45 Tw62-22 ( 4-b), ) 0.1,, Ce TW10, U-Pb 3.3 U-Pb 521 Ma, 2400~500Ma, 2 3, 1000~700 Ma,2400~1800 Ma 80 U-Pb ( 5) ( 7-a); TW32, U-Pb, 435Ma, 2500~400Ma, 2 (>15%),3, 1000~700,2500~1800 Ma 72 77 75 ( 7-b); TW62, U-Pb ( 6), 437Ma, 1800~400Ma, 2,,, 1000~700 Ma,2300~ -, 50~150μm, 1700 Ma( 7-c)

2 : U-Pb 5 Fig.5 5 U-Pb U-PbConcordiaofzirconsinsandstoneofKepingtageFormation Th/U 6 Fig.6 CLimagesofdetritalzirconsofthesandstoneinKepingtageFormation 2 U-Pb Table2 ZirconU-Pbage-datingofsandstonesinKepingtageFormation /Ma 207 Pb/ 206 Pb 1σ 207 Pb/ 235 U 1σ 206 Pb/ 238 U 1σ 207 Pb/ 206 Pb 1σ 207 Pb/ 235 U 1σ 206 Pb/ 238 U 1σ 1 0.63 0.1118 0.0028 5.0694 0.1316 0.3275 0.0057 1829 45 1831 22 1826 28 2 0.06 0.1444 0.0028 8.6988 0.1699 0.4363 0.0072 2281 34 2307 18 2334 32 3 0.77 0.1226 0.0032 3.7479 0.0990 0.2220 0.0045 1994 47 1582 21 1293 24 4 0.44 0.1567 0.0034 9.9139 0.1999 0.4587 0.0070 2420 37 2427 19 2434 31 5 0.34 0.0704 0.0017 1.4903 0.0364 0.1530 0.0024 943 45 926 15 918 14 6 0.51 0.0753 0.0020 1.8774 0.0492 0.1805 0.0032 1077 48 1073 17 1070 18 7 0.52 0.3941 0.0080 45.8602 0.9298 0.8422 0.0143 3887 30 3906 20 3939 50 8 0.50 0.0767 0.0021 1.4270 0.0380 0.1347 0.0024 1115 54 900 16 814 13 9 0.66 0.1110 0.0029 5.1991 0.1378 0.3388 0.0060 1817 47 1852 23 1881 29 10 0.55 0.1003 0.0024 3.9633 0.1034 0.2845 0.0046 1629 45 1627 21 1614 23 11 0.47 0.1547 0.0032 9.7709 0.2230 0.4553 0.0080 2399 35 2413 21 2419 35 12 0.11 0.0768 0.0016 2.1034 0.0458 0.1975 0.0030 1117 47 1150 15 1162 16 13 0.38 0.0666 0.0015 1.2441 0.0295 0.1348 0.0022 826 47 821 13 815 12 14 1.03 0.1616 0.0040 11.0147 0.2767 0.4930 0.0084 2473 41 2524 23 2583 36 15 0.50 0.0821 0.0028 1.2987 0.0385 0.1153 0.0019 1256 72 845 17 704 11 16 1.45 0.0634 0.0027 1.1033 0.0467 0.1266 0.0027 720 91 755 23 768 15 17 0.33 0.1066 0.0027 5.0931 0.1285 0.3458 0.0061 1743 47 1835 21 1914 29 18 0.26 0.2401 0.0050 19.4579 0.5018 0.5866 0.0133 3121 34 3065 25 2975 54 19 0.92 0.1555 0.0040 9.0218 0.2316 0.4206 0.0081 2407 42 2340 23 2263 37 20 1.46 0.0689 0.0029 1.5233 0.0654 0.1604 0.0033 898 89 940 26 959 18 21 0.85 0.1347 0.0032 7.7409 0.1852 0.4152 0.0072 2161 47 2201 22 2239 33 22 0.58 0.0704 0.0019 1.6758 0.0439 0.1730 0.0033 940 55 999 17 1029 18 23 0.68 0.1162 0.0045 5.1654 0.2108 0.3233 0.0076 1899 71 1847 35 1806 37 24 0.74 0.1341 0.0031 7.6228 0.1800 0.4085 0.0064 2154 41 2188 21 2208 29 25 0.44 0.1461 0.0034 8.9445 0.2035 0.4426 0.0082 2302 40 2332 21 2362 37

6 2017 2 Th/U /Ma 207 Pb/ 206 Pb 1σ 207 Pb/ 235 U 1σ 206 Pb/ 238 U 1σ 207 Pb/ 206 Pb 1σ 207 Pb/ 235 U 1σ 206 Pb/ 238 U 1σ 26 0.99 0.2313 0.0190 8.4797 1.2647 0.1883 0.0106 3061 131 2284 136 1112 58 27 0.43 0.0738 0.0027 1.6062 0.0548 0.1600 0.0032 1035 75 973 21 957 18 28 0.32 0.1696 0.0034 10.3302 0.2192 0.4396 0.0077 2554 33 2465 20 2349 34 29 0.81 0.0774 0.0027 1.3385 0.0497 0.1246 0.0021 1131 69 863 22 757 12 30 1.06 0.0638 0.0029 0.7467 0.0353 0.0842 0.0015 744 96 566 21 521 9 31 1.05 0.0785 0.0022 2.0761 0.0569 0.1914 0.0033 1161 54 1141 19 1129 18 32 0.41 0.1006 0.0036 1.8923 0.0621 0.1373 0.0025 1635 66 1078 22 829 14 33 0.59 0.2476 0.0061 20.9955 0.5394 0.6117 0.0109 3169 39 3138 25 3077 44 34 0.34 0.0976 0.0023 3.5585 0.0889 0.2629 0.0043 1589 44 1540 20 1505 22 35 0.84 0.0888 0.0071 1.5947 0.1583 0.1254 0.0023 1411 153 968 62 762 13 36 1.05 0.0643 0.0016 1.1018 0.0276 0.1245 0.0023 750 251 754 13 757 13 37 0.86 0.0685 0.0027 1.2006 0.0466 0.1279 0.0025 883 81 801 21 776 15 38 0.17 0.0696 0.0017 1.2803 0.0310 0.1335 0.0022 917 49 837 14 808 13 39 0.57 0.0668 0.0020 1.2335 0.0316 0.1348 0.0022 831 62 816 14 815 13 40 0.69 0.1187 0.0029 5.4628 0.1575 0.3315 0.0057 1937 44 1895 25 1846 28 41 0.57 0.1893 0.0050 13.4949 0.3495 0.5200 0.0106 2736 49 2715 24 2699 45 42 0.44 0.1522 0.0037 8.5122 0.2246 0.4071 0.0082 2370 42 2287 24 2202 38 43 0.42 0.2673 0.0058 23.9313 0.5562 0.6488 0.0119 3290 33 3266 23 3224 46 44 0.24 0.0717 0.0025 1.3958 0.0522 0.1414 0.0035 977 75 887 22 853 20 45 0.25 0.0772 0.0038 1.5937 0.0910 0.1495 0.0037 1128 98 968 36 898 21 46 0.83 0.1169 0.0036 5.3611 0.1683 0.3356 0.0075 1910 56 1879 27 1866 36 47 0.71 0.1165 0.0035 5.1279 0.1452 0.3217 0.0062 1903 59 1841 24 1798 30 48 0.90 0.0776 0.0025 1.3144 0.0427 0.1223 0.0023 1139 63 852 19 744 13 49 0.92 0.0986 0.0043 1.8329 0.0816 0.1357 0.0036 1598 81 1057 29 820 21 50 1.19 0.0652 0.0019 1.0784 0.0322 0.1203 0.0022 789 61 743 16 732 13 51 0.47 0.0741 0.0022 1.6281 0.0498 0.1599 0.0029 1056 60 981 19 956 16 52 0.50 0.0756 0.0019 1.9880 0.0565 0.1918 0.0039 1083 56 1111 19 1131 21 53 0.61 0.1117 0.0032 5.1141 0.1559 0.3319 0.0063 1828 51 1838 26 1848 30 54 0.83 0.0608 0.0017 1.0888 0.0322 0.1298 0.0022 632 64 748 16 786 13 55 0.33 0.0993 0.0023 3.9967 0.0955 0.2926 0.0049 1611 43 1634 19 1654 25 56 0.54 0.0755 0.0018 1.9253 0.0485 0.1845 0.0028 1083 47 1090 17 1092 15 57 0.98 0.1132 0.0035 5.4393 0.1816 0.3472 0.0063 1852 56 1891 29 1921 30 58 0.57 0.1526 0.0034 9.1978 0.2084 0.4359 0.0062 2376 38 2358 21 2332 28 59 0.69 0.0936 0.0024 3.5196 0.0987 0.2716 0.0049 1502 49 1532 22 1549 25 60 0.36 0.1123 0.0027 5.2029 0.1297 0.3364 0.0066 1839 43 1853 21 1869 32 61 0.64 0.1167 0.0038 5.3954 0.1623 0.3385 0.0064 1905 55 1884 26 1880 31 62 0.87 0.1778 0.0036 11.7666 0.2567 0.4765 0.0078 2632 34 2586 20 2512 34 63 0.84 0.1084 0.0030 5.0125 0.1325 0.3347 0.0058 1773 56 1821 22 1861 28 64 3.53 0.0633 0.0029 0.8051 0.0353 0.0924 0.0015 717 98 600 20 570 9 65 0.49 0.0811 0.0022 2.1471 0.0580 0.1909 0.0034 1233 54 1164 19 1126 19 66 1.39 0.0868 0.0026 1.4324 0.0435 0.1188 0.0020 1367 57 903 18 724 12 67 0.48 0.1104 0.0024 4.9499 0.1093 0.3225 0.0047 1805 39 1811 19 1802 23 68 1.36 0.1088 0.0029 5.0221 0.1377 0.3332 0.0056 1789 49 1823 23 1854 27 69 0.40 0.0912 0.0022 1.3144 0.0351 0.1038 0.0018 1450 47 852 15 636 10 70 0.50 0.0715 0.0022 1.5703 0.0507 0.1594 0.0032 972 63 959 20 954 18 71 0.61 0.0699 0.0046 0.9947 0.0692 0.1039 0.0029 924 134 701 35 637 17 72 0.37 0.0762 0.0021 2.0296 0.0572 0.1918 0.0031 1102 49 1125 19 1131 17 73 0.14 0.0780 0.0022 2.1180 0.0595 0.1983 0.0041 1146 50 1155 19 1166 22 74 0.64 0.0644 0.0024 1.2241 0.0426 0.1397 0.0029 754 80 812 19 843 16 75 0.18 0.0757 0.0021 1.9555 0.0570 0.1869 0.0036 1088 55 1100 20 1104 20 76 0.58 0.0579 0.0028 0.9660 0.0435 0.1242 0.0027 524 108 686 22 755 15 77 0.83 0.0683 0.0023 1.1497 0.0363 0.1233 0.0025 880 69 777 17 749 14 78 0.48 0.1028 0.0022 4.3584 0.0896 0.3063 0.0044 1676 39 1704 17 1723 22 79 0.50 0.1208 0.0034 6.4403 0.1998 0.3837 0.0070 1969 50 2038 27 2094 32 80 0.40 0.0757 0.0018 1.7100 0.0420 0.1627 0.0026 1088 52 1012 16 972 14 1 1.09 0.0798 0.0028 2.2854 0.0823 0.2076 0.0037 1192 70 1208 25 1216 20 2 0.56 0.0812 0.0026 2.1996 0.0694 0.1967 0.0038 1228 62 1181 22 1158 20 3 0.51 0.1033 0.0030 4.0435 0.1244 0.2829 0.0055 1684 52 1643 25 1606 28 4 0.35 0.0704 0.0023 1.6284 0.0532 0.1681 0.0030 939 68 981 21 1002 17 5 0.90 0.1168 0.0041 5.8170 0.1924 0.3631 0.0073 1909 57 1949 29 1997 35 6 0.30 0.0795 0.0035 1.9016 0.0827 0.1735 0.0041 1185 90 1082 29 1031 22 7 0.99 0.0684 0.0039 1.5208 0.0828 0.1629 0.0037 883 117 939 33 973 21 8 0.48 0.0665 0.0027 1.2785 0.0533 0.1395 0.0032 820 79 836 24 842 18 9 0.48 0.1880 0.0055 13.6698 0.4106 0.5252 0.0112 2725 48 2727 28 2721 47 10 0.42 0.1708 0.0046 12.0758 0.3404 0.5111 0.0105 2566 45 2610 26 2661 45 11 0.48 0.0662 0.0024 1.2525 0.0432 0.1373 0.0025 813 71 825 19 830 14

2 : U-Pb 7 2 Th/U /Ma 207 Pb/ 206 Pb 1σ 207 Pb/ 235 U 1σ 206 Pb/ 238 U 1σ 207 Pb/ 206 Pb 1σ 207 Pb/ 235 U 1σ 206 Pb/ 238 U 1σ 12 1.06 0.0657 0.0032 1.1572 0.0536 0.1293 0.0025 796 98 781 25 784 14 13 1.35 0.1741 0.0049 10.4892 0.3010 0.4369 0.0092 2598 47 2479 27 2337 41 14 1.07 0.1778 0.0058 12.0882 0.4093 0.4923 0.0105 2632 55 2611 32 2581 45 15 0.56 0.1089 0.0034 4.6362 0.1443 0.3078 0.0055 1783 57 1756 26 1730 27 16 0.19 0.3817 0.0117 40.4508 1.4096 0.7581 0.0158 3839 46 3782 35 3637 58 17 0.70 0.1634 0.0048 10.7540 0.3205 0.4804 0.0103 2492 49 2502 28 2529 45 18 0.59 0.0704 0.0044 1.2472 0.0749 0.1335 0.0034 943 128 822 34 808 20 19 0.91 0.1647 0.0045 10.3941 0.2988 0.4594 0.0082 2506 46 2471 27 2437 36 20 0.15 0.1216 0.0034 5.4916 0.1590 0.3297 0.0066 1979 49 1899 25 1837 32 21 0.71 0.1733 0.0056 11.5698 0.3972 0.4881 0.0101 2591 54 2570 32 2563 44 22 0.67 0.0675 0.0025 1.2021 0.0448 0.1304 0.0026 854 76 802 21 790 15 23 0.40 0.0747 0.0028 1.5964 0.0626 0.1567 0.0030 1061 81 969 24 938 17 24 0.24 0.0626 0.0022 0.7254 0.0255 0.0849 0.0015 698 74 554 15 525 9 25 0.49 0.0641 0.0038 0.9653 0.0532 0.1133 0.0025 743 126 686 27 692 14 26 1.08 0.1034 0.0045 4.1312 0.1838 0.2919 0.0063 1687 80 1660 36 1651 32 27 0.14 0.0838 0.0024 2.1442 0.0637 0.1870 0.0038 1288 56 1163 21 1105 20 28 0.52 0.1103 0.0044 5.1316 0.2169 0.3375 0.0075 1806 72 1841 36 1875 36 29 0.89 0.0695 0.0036 1.3324 0.0699 0.1386 0.0027 922 92 860 30 836 15 30 1.13 0.0692 0.0041 1.3193 0.0765 0.1391 0.0038 906 122 854 34 840 21 31 1.14 0.0626 0.0031 1.1275 0.0576 0.1306 0.0029 694 106 767 27 791 17 32 0.36 0.1769 0.0057 10.5718 0.3570 0.4363 0.0109 2624 53 2486 31 2334 49 33 0.53 0.0681 0.0032 1.1231 0.0522 0.1203 0.0027 872 96 764 25 732 15 34 0.64 0.1069 0.0040 5.2314 0.2176 0.3536 0.0090 1748 69 1858 35 1952 43 35 0.74 0.0707 0.0030 1.3284 0.0586 0.1369 0.0034 950 87 858 26 827 19 36 1.08 0.0665 0.0023 1.3340 0.0453 0.1455 0.0029 820 77 861 20 876 16 37 0.56 0.1049 0.0044 4.9148 0.1979 0.3400 0.0080 1713 76 1805 34 1887 39 38 0.10 0.0740 0.0024 1.4593 0.0452 0.1427 0.0026 1043 65 914 19 860 15 39 0.60 0.1112 0.0032 5.6874 0.1582 0.3679 0.0062 1820 51 1929 24 2020 29 40 0.62 0.0700 0.0026 1.6224 0.0622 0.1667 0.0030 928 82 979 24 994 16 41 0.21 0.1742 0.0047 10.7021 0.3345 0.4396 0.0095 2598 44 2498 29 2349 42 42 1.15 0.0920 0.0036 3.0318 0.1196 0.2389 0.0054 1533 74 1416 30 1381 28 43 0.76 0.0990 0.0041 3.3349 0.1405 0.2450 0.0058 1606 78 1489 33 1412 30 44 0.48 0.0946 0.0033 3.1667 0.1022 0.2433 0.0053 1520 65 1449 25 1404 27 45 2.12 0.1620 0.0051 10.4105 0.2983 0.4643 0.0087 2477 48 2472 27 2459 38 46 0.58 0.0829 0.0029 1.9641 0.0689 0.1708 0.0037 1278 101 1103 24 1016 20 47 0.35 0.1197 0.0039 5.3034 0.1715 0.3185 0.0070 1952 58 1869 28 1782 34 48 4.14 0.0725 0.0043 0.8874 0.0483 0.0900 0.0024 999 119 645 26 556 14 49 0.32 0.1704 0.0058 10.6821 0.3524 0.4518 0.0105 2562 57 2496 31 2403 46 50 0.38 0.1420 0.0051 8.0855 0.3040 0.4054 0.0080 2254 63 2241 34 2194 37 51 0.66 0.0797 0.0029 1.4221 0.0490 0.1275 0.0024 1191 71 898 21 774 13 52 1.42 0.0777 0.0052 1.7403 0.1072 0.1639 0.0037 1140 133 1024 40 978 20 53 0.41 0.1620 0.0043 10.7324 0.2848 0.4724 0.0085 2477 44 2500 25 2494 37 54 1.06 0.1069 0.0046 4.8821 0.1923 0.3341 0.0076 1747 79 1799 33 1858 37 55 1.06 0.0603 0.0032 1.0586 0.0520 0.1286 0.0029 613 115 733 26 780 16 56 0.44 0.2342 0.0077 21.9533 0.6797 0.6719 0.0124 3081 53 3182 30 3313 48 57 0.57 0.1323 0.0067 5.9498 0.2946 0.3255 0.0083 2129 88 1969 43 1816 40 58 0.84 0.0731 0.0029 1.8213 0.0669 0.1809 0.0038 1017 47 1053 24 1072 21 59 0.76 0.0633 0.0037 1.1812 0.0729 0.1333 0.0032 720 124 792 34 806 18 60 0.52 0.1772 0.0046 12.8042 0.3434 0.5220 0.0115 2627 43 2665 25 2708 49 61 0.13 0.1122 0.0034 5.2871 0.1657 0.3401 0.0074 1835 56 1867 27 1887 36 62 0.23 0.0793 0.0030 1.8956 0.0796 0.1709 0.0036 1181 74 1080 28 1017 20 63 0.68 0.0637 0.0028 0.6224 0.0283 0.0698 0.0013 731 99 491 18 435 8 64 0.52 0.0684 0.0028 1.5533 0.0613 0.1649 0.0034 881 85 952 24 984 19 65 0.61 0.0876 0.0032 3.1199 0.1185 0.2578 0.0057 1376 71 1438 29 1478 29 66 0.23 0.0611 0.0022 0.8313 0.0302 0.0984 0.0018 643 77 614 17 605 11 67 1.07 0.0712 0.0035 1.2374 0.0626 0.1253 0.0027 965 100 818 28 761 15 68 0.21 0.0727 0.0021 1.6149 0.0561 0.1589 0.0029 1006 59 976 22 951 16 69 0.91 0.0571 0.0027 0.6617 0.0306 0.0839 0.0016 498 102 516 19 519 10 70 1.00 0.0684 0.0036 0.8969 0.0473 0.0961 0.0023 880 107 650 25 592 13 71 0.24 0.0713 0.0025 1.6099 0.0596 0.1630 0.0029 969 72 974 23 973 16 72 0.56 0.1149 0.0039 4.9321 0.1745 0.3112 0.0066 1880 61 1808 30 1747 32 73 0.44 0.1577 0.0054 9.5935 0.3408 0.4396 0.0083 2432 58 2397 33 2349 37 74 0.42 0.0744 0.0029 1.8390 0.0722 0.1806 0.0038 1052 79 1059 26 1070 21 75 0.63 0.0692 0.0023 1.3169 0.0421 0.1382 0.0024 906 69 853 18 834 14 76 0.60 0.0687 0.0026 1.2298 0.0459 0.1298 0.0025 900 78 814 21 786 14 77 0.82 0.0639 0.0025 1.1585 0.0437 0.1320 0.0027 739 81 781 21 799 15 78 0.62 0.0908 0.0026 2.5252 0.0758 0.1999 0.0036 1443 54 1279 22 1175 20 79 1.46 0.0684 0.0026 1.5215 0.0580 0.1609 0.0035 883 117 939 23 962 20 80 0.32 0.0845 0.0029 2.1706 0.0739 0.1873 0.043 1303 67 1172 24 1107 23

8 2017 2 Th/U /Ma 207 Pb/ 206 Pb 1σ 207 Pb/ 235 U 1σ 206 Pb/ 238 U 1σ 207 Pb/ 206 Pb 1σ 207 Pb/ 235 U 1σ 206 Pb/ 238 U 1σ 1 0.27 0.1119 0.0022 4.0403 0.0885 0.2607 0.0039 1831 36 1642 18 1493 20 2 1.54 0.1218 0.0030 6.1044 0.1394 0.3642 0.0055 1983 44 1991 20 2002 26 3 0.36 0.0703 0.0029 1.3016 0.0526 0.1354 0.0025 1000 86 846 23 818 14 4 0.81 0.1122 0.0027 5.3199 0.1321 0.3438 0.0055 1836 44 1872 21 1905 27 5 0.45 0.1058 0.0027 4.5232 0.1184 0.3096 0.0053 1727 46 1735 22 1739 26 6 0.41 0.0743 0.0023 1.7081 0.0505 0.1673 0.0028 1050 61 1012 19 997 16 7 1.17 0.0694 0.0022 1.1712 0.0386 0.1224 0.0022 909 67 787 18 744 13 8 0.57 0.0666 0.0051 0.6217 0.0433 0.0701 0.0018 826 166 491 27 437 11 9 0.51 0.0706 0.0026 1.3185 0.0536 0.1346 0.0027 946 71 854 23 814 15 10 0.64 0.0745 0.0022 1.2552 0.0357 0.1233 0.0026 1055 63 826 16 749 15 11 0.65 0.0588 0.0033 0.5860 0.0309 0.0742 0.0017 561 124 468 20 462 10 12 0.48 0.0708 0.0022 1.3376 0.0380 0.1386 0.0029 952 63 862 17 837 17 13 0.57 0.1697 0.0040 11.0993 0.2643 0.4768 0.0095 2555 39 2532 22 2513 41 14 0.96 0.0847 0.0040 1.4035 0.0693 0.1202 0.0031 1309 92 890 29 731 18 15 0.10 0.0632 0.0033 0.9294 0.0475 0.1089 0.0026 722 111 667 25 666 15 16 0.62 0.0783 0.0027 1.4022 0.0449 0.1309 0.0023 1154 69 890 19 793 13 17 1.13 0.0908 0.0018 3.0044 0.0602 0.2425 0.0051 1443 38 1409 15 1400 26 18 4.69 0.0992 0.0079 2.1660 0.1263 0.1758 0.0055 1609 148 1170 41 1044 30 19 0.57 0.0632 0.0020 1.2002 0.0374 0.1380 0.0023 717 64 801 17 833 13 20 0.70 0.0728 0.0026 1.5204 0.0543 0.1514 0.0029 1009 40 939 22 909 16 21 1.33 0.1614 0.0040 10.4246 0.2418 0.4694 0.0083 2470 47 2473 21 2481 37 22 0.04 0.1392 0.0032 7.4292 0.2093 0.3840 0.0077 2217 41 2164 25 2095 36 23 0.79 0.0726 0.0025 1.7324 0.0599 0.1721 0.0031 1003 70 1021 22 1024 17 24 0.66 0.0746 0.0030 1.9031 0.0778 0.1851 0.0035 1059 80 1082 27 1095 19 25 0.35 0.1240 0.0032 6.7132 0.1779 0.3903 0.0073 2015 46 2074 23 2124 34 26 1.31 0.1273 0.0076 5.1365 0.3104 0.2944 0.0079 2061 106 1842 51 1663 39 27 0.92 0.0676 0.0032 1.2527 0.0583 0.1379 0.0046 857 92 825 26 833 26 28 0.56 0.0626 0.0037 0.6264 0.0359 0.0738 0.0017 694 126 494 22 459 10 29 0.67 0.0759 0.0022 2.0135 0.0625 0.1895 0.0034 1092 59 1120 21 1119 18 30 0.59 0.0712 0.0022 1.3311 0.0405 0.1343 0.0024 965 64 859 18 812 14 31 0.59 0.1096 0.0028 4.9089 0.1185 0.3216 0.0057 1794 46 1804 20 1798 28 32 1.17 0.0627 0.0025 1.0663 0.0410 0.1231 0.0024 698 90 737 20 748 14 33 0.90 0.0732 0.0051 1.0243 0.0739 0.1039 0.0035 1020 142 716 37 637 20 34 0.52 0.0665 0.0026 1.2712 0.0491 0.1369 0.0024 820 81 833 22 827 14 35 0.71 0.0635 0.0021 1.1887 0.0391 0.1353 0.0026 724 72 795 18 818 15 36 0.68 0.1101 0.0057 4.8590 0.2564 0.3245 0.0084 1811 93 1795 44 1812 41 37 0.92 0.0647 0.0033 1.1847 0.0603 0.1336 0.0027 765 108 794 28 808 15 38 0.60 0.0630 0.0023 1.1407 0.0411 0.1299 0.0021 709 76 773 20 787 12 39 0.85 0.0766 0.0058 1.2860 0.0920 0.1250 0.0036 1111 150 840 41 759 21 40 0.75 0.1633 0.0048 10.7965 0.3289 0.4751 0.0081 2500 50 2506 28 2506 35 41 1.58 0.1093 0.0042 4.4588 0.1658 0.2940 0.0061 1787 70 1723 31 1661 30 42 0.37 0.1160 0.0035 5.1327 0.1573 0.3184 0.0067 1895 55 1842 26 1782 33 43 0.54 0.1706 0.0051 11.1183 0.3299 0.4704 0.0088 2565 50 2533 28 2485 39 44 1.13 0.1143 0.0039 5.1129 0.1794 0.3243 0.0071 1868 62 1838 30 1811 35 45 0.06 0.0716 0.0023 1.5365 0.0488 0.1549 0.0028 976 65 945 20 929 15 46 0.60 0.0645 0.0037 1.1142 0.0602 0.1259 0.0028 767 122 760 29 764 16 47 0.96 0.1719 0.0042 10.1744 0.2557 0.4247 0.0060 2576 41 2451 23 2282 27 48 0.72 0.1194 0.0043 4.9504 0.1860 0.3046 0.0067 1947 65 1811 32 1714 33 49 2.02 0.1034 0.0057 4.4726 0.2516 0.3193 0.0089 1687 102 1726 47 1786 43 50 0.63 0.0679 0.0023 1.3018 0.0453 0.1385 0.0026 866 103 847 20 836 15 51 0.80 0.0854 0.0028 2.7775 0.0989 0.2333 0.0046 1325 63 1350 27 1352 24 52 0.45 0.0646 0.0021 1.2314 0.0393 0.1388 0.0029 761 67 815 18 838 16 53 1.80 0.0659 0.0025 1.1130 0.0400 0.1229 0.0023 803 78 760 19 747 13 54 1.64 0.1124 0.0035 5.8032 0.1737 0.3760 0.0075 1839 56 1947 26 2058 35 55 0.47 0.1161 0.0030 4.8947 0.1245 0.3039 0.0049 1898 46 1801 21 1711 24 56 0.51 0.1728 0.0051 11.9019 0.3560 0.4990 0.0101 2585 50 2597 28 2609 43 57 0.53 0.0754 0.0036 1.9548 0.0924 0.1910 0.0045 1080 92 1100 32 1127 25 58 0.57 0.0656 0.0034 1.2912 0.0686 0.1410 0.0028 794 107 842 30 850 16 59 0.79 0.0652 0.0027 1.2414 0.0464 0.1393 0.0027 783 83 820 21 841 15 60 0.70 0.0649 0.0026 1.2375 0.0496 0.1377 0.0024 772 85 818 23 832 13 61 1.36 0.0703 0.0026 1.1712 0.0410 0.1206 0.0020 937 74 787 19 734 11 62 0.63 0.0668 0.0022 1.1920 0.0406 0.1284 0.0025 831 69 797 19 779 15 63 0.85 0.0854 0.0078 0.8102 0.0717 0.0709 0.0024 1326 177 603 40 442 15 64 1.25 0.0656 0.0034 1.1320 0.0585 0.1253 0.0027 794 107 769 28 761 16 65 0.52 0.0657 0.0027 1.1997 0.0495 0.1318 0.0026 798 85 800 23 798 15 66 0.46 0.0706 0.0022 1.6270 0.0514 0.1657 0.0028 946 62 981 20 988 16 67 0.27 0.0659 0.0020 1.2053 0.0383 0.1317 0.0023 803 63 803 18 798 13 68 0.70 0.0811 0.0034 2.1510 0.0947 0.1909 0.0037 1233 82 1165 31 1126 20 69 0.61 0.1221 0.0036 5.8197 0.1760 0.3458 0.0060 1987 47 1949 26 1915 29

2 : U-Pb 9 2 Th/U /Ma 207 Pb/ 206 Pb 1σ 207 Pb/ 235 U 1σ 206 Pb/ 238 U 1σ 207 Pb/ 206 Pb 1σ 207 Pb/ 235 U 1σ 206 Pb/ 238 U 1σ 70 0.60 0.0780 0.0026 1.3332 0.0460 0.1243 0.0024 1147 67 860 20 755 14 71 0.58 0.0701 0.0024 1.1789 0.0454 0.1217 0.0023 931 75 791 21 740 13 72 0.50 0.1448 0.0050 8.4477 0.3074 0.4234 0.0067 2285 59 2280 33 2276 30 73 0.40 0.0746 0.0030 1.2853 0.0543 0.1254 0.0024 1059 81 839 24 761 14 74 0.38 0.0671 0.0027 1.2208 0.0472 0.1335 0.0024 843 83 810 22 808 14 75 0.68 0.0675 0.0028 1.1336 0.0469 0.1215 0.0019 854 118 769 22 739 11 76 0.54 0.1046 0.0033 4.0976 0.1327 0.2861 0.0055 1709 59 1654 26 1622 28 77 0.28 0.1216 0.0032 5.9240 0.1629 0.3527 0.0058 1979 47 1965 24 1947 28 78 0.56 0.0976 0.0033 3.4929 0.1205 0.2596 0.0047 1589 63 1526 27 1488 24 79 0.54 0.1108 0.0038 4.5500 0.1689 0.2947 0.0052 1813 63 1740 31 1665 26 80 0.65 0.1629 0.0053 7.4442 0.2441 0.3300 0.0067 2487 55 2166 29 1838 33 7 U-Pb Fig.7 ColumngraphforzirconagesdistributionofKepingtageFormation 02-9 6.48% ) (TiO 2 )(0.15%~0.55%, 0.40%),, U-Pb (TiO 2 )- (Fe 2O 3+MgO) ( 8- a) K 2O/Na 2O- (SiO 2 ) ( 8-b) [28-29], (REE) [30] ;,, ( REE Th Sc Cr Ni ),, La/Sc 2.76~9.29, [31-33] ; ( ) 5.32;La/Y 0.92~2.18, 1.61;Th/Sc 0.67~1.90, 1.10; 4 4.1 ( 8-c), 4.2,, U-Pb [34] 2, 1000~700,2500~, Fe 2O 3+MgO TiO 2 Al 2O 3 SiO 2 1800 Ma, -, K 2O/Na 2O Al 2O 3 /(Na 2O+CaO), (SiO 2 ),Na 2O CaO TiO 2 U-Pb 2500 Ma (Tw10 (SiO 2 )(67.28%~92.58%, 7,Tw32 8,Tw62 3 ) 79.43%), (Na 2O)(0.28%~1.92%, 1.31%) (CaO)(0.35%~2.10%, 0.86%, Sc/Cr 0.17~0.28, 0.22 La/Y-Sc/Cr,

10 2017 8 A. ;B. ;C. ;D. (a b [32];c [17]) Fig.8 Discriminatiomdiagramsofsandstonefrom KepingtageFormationfortectonicseting U-Pb 2600 Ma, TIMS 2565 Ma [28-29] 2500~1800 Ma [(2492±19) (1836±25)Ma] [47-49] [(1943±6)Ma], -, -,Carrola [35] (1962±27)Ma [50] (2100~ 1800 Ma) [36] [9-10] 1000~700 Ma U-Pb [(807±21) 20 Ma],,, [(755±15)Ma] A ( [(815±57)Ma] ( U-Pb 8), 753 Ma) [ SHRIMP,3 U-Pb (757.4±6.2)Ma], ( 7), [37-41],, Rodinia, [42], Rodinia 850~750 Ma, 5,, (1),, 2 [(435±8),(437±11)Ma], (2) 1000, ~700 Ma 2500~1800 Ma, 2500 Ma, [(430.6±1.6)Ma],, - - - (3), [(419.2±3.1),(418±2.7) Ma] [43-44] :, [1],,. [45-46],, [M]. :,1991:1-29.

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12 2017 [42],,,. Newinsightsfromgeochemistry,geochronologyandpetrology [J].,2010,31(1):65-72. [43],,,. 598. [J].,2006,25 [47],,,. [J]. (6):725-729. [44],,,. [48],,,, [J].,2013, : SHRIMP LA-ICP-MS [J]. 32(2/3):220-238. [45] Wang B,Shu L,Faure M,etal.Paleozoictectonicsofthe southernchinesetianshan:insightsfrom structural,chrono- logicalandgeochemicalstudiesofthe Heiyingshan ophiolitic 104. [46]ChenXJ,ShuLs,Santosh M.LatePaleozoicpost-colisional magmatismintheeastern Tianshan Belt,NorthwestChina:,2009,28(12):1804-1816. :,2007,37(2):145-154. [49],,. : [J].,2002,21(2):55-62. [50]CarrolaA R,Graham SA,ChangEZ,etal.Sinianthrough Permiantectonostratigraphic evolution ofthe northwestern Tarim Basin,China[J].GeologicalSocietyofAmericaMemoir, 2001,194:47-70. ProvenanceAnalysisfrom EarlySilurianKepingtage FormationinKepingArea,Xinjiang: Constraintsfrom GeochemicalCharacteristicsand ZirconU-PbGeochronology LiLulu 1,YangBaozhong 2,YinYonghui 1,LiuLonglong 1,WangBing 1 (1.No.7GoldGeologicalPartyofPAP,YantaiShandong264000,China; 2.SchoolofEarthSciences,ChinaUniversityofGeosciences(Wuhan),Wuhan430074,China) melange(nw China)[J].Tectonophysics,2011,497(1/4):85- ofbimodalvolcanicrocks[j].lithos,2011,127(3/4):581- Abstract:Takinggray-greensandstoneofKepingtageFormationforresearchobjects,systematicgeochem- icalandisotopicgeochronologicalanalysesareapplied.resultssuggestthattherearehighcontentofsio 2 andlowcontentofna 2O,CaOandTiO 2. LREE> HREE,abnormityofEuisnegative.U-Pbagesof zirconsconcentratein1000-700 Maand2500-1800 Ma,whichmaycorrespondingtotectonicuplifting eventsoccurredduringlateproterozoicnanhuatoqingbaikouperiodand magmaticemplacementcouple withintensetectonicmovementsduringpaleoproterozoic.severalu-pbagesofzirconsover2500ma,may berelatedtoremeltingofarcheozoicstrata.twou-pbagesofzirconsbetween437 Mato435 Mamaybe relatedtomagmationresultedfromsouthwardsubductionofthesouth Tianshan Ocean.Analysesshow thatthekepingareawassituatedonapassivecontinentalmarginduringearlysilurian.sedimentaryrocks aremainlysourcedfrom Pre-Cambrianbasementrocksin Tabeiarea,mixing withseveralgranitzircons from EarlySilurian. Keywords:KepingtageFormation;geochemistry;provenanceregion;U-Pbdating