Formation Age of BIF-Bearing Anshan Group Supracrustal Rocks in Anshan-Benxi Area: New Evidence from SHRIMP U-Pb Zircon Dating
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摘要: 鞍本是华北克拉通最为重要的BIF铁矿集中区之一，BIF赋存于鞍山群表壳岩中.通过对广泛分布的鞍山群表壳岩的12个样品进行锆石SHRIMP U-Pb定年，大都获得2.50~2.55 Ga岩浆锆石年龄，一些岩石中存在2.7~3.5 Ga碎屑锆石或外来锆石.一些东北部（东部）岩石记录了新太古代晚期-古元古代早期变质锆石年龄.结合前人研究成果，可得出如下结论：（1）鞍本地区广泛分布的鞍山群含BIF表壳岩形成时代为新太古代晚期；（2）鞍山群表壳岩形成于陆壳基底之上.该研究进一步支持了已有认识：鞍本为东部古陆块西缘新太古代晚期巨型BIF成矿带的重要组成部分，稳定的构造环境有利于大规模BIF形成.
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关键词:
- 鞍山群 /
- 新太古代 /
- 锆石SHRIMP U-Pb定年 /
- 鞍山-本溪地区 /
- 岩石学
Abstract: Anshan-Benxi is one of the most important BIF concentration areas in the North China Craton, the BIF occurred in the Anshan Group supracrustal rocks. Using SHRIMP U-Pb zircon dating technique, 12 supracrustal samples of the Anshan Group were analyzed. Most samples present 2.50-2.55 Ga zircon ages and 2.7-3.5 Ga detrital or xenocrystal zircons are observed in some samples. Combined with previous studies, main conclusions can be drawn as follows. (1) The widespread BIF-bearing Anshan Group supracrustal rocks in the Anshan-Benxi area were deposited during the Late Neoarchean. (2) The Anshan Group supracrustal rocks were formed over a continental basement. This study confirms that Anshan-Benxi is an important conponent of the huge Late Neoarchean BIF belt along the western margin of the eastern ancient terrane, and stable tectonic environment seems to be a key factor for the formation of huge-scale BIF ore deposit.-
Key words:
- Anshan Group /
- Neoarchean /
- SHRIMP U-Pb zircon dating /
- Anshan-Benxi area /
- petrology
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图 1 鞍本地区地质简图
图据Wan et al.(2015b)；图中给出了定年样品位置.编号为斜体的样品引自文献(王守伦和张瑞华，1995；代堰锫等，2012；万渝生等，2012；Cui et al., 2013; Han et al., 2014; Zhu et al., 2015; Li et al., 2016; Guo et al., 2017)；ZK7921位置不能准确确定，但在齐大山矿带上；G02-8位置不能准确确定，但在弓长岭矿区；其他的来自本文
Fig. 1. Geological sketch of the Anben area
图 2 鞍本地区鞍山群表壳岩的野外照片
a.表壳岩露头远景，眼前山铁矿；b.黑云变粒岩(A1502)，眼前山铁矿；c.二云石英片岩呈层状产出，弓长岭岭东矿区；d.二云石英片岩(A1114)，弓长岭岭东矿区；e.露头远景，表壳岩包体存在于2.5 Ga正长花岗岩中，连山关北；f.黑云二长变粒岩(A1217)，连山关北
Fig. 2. Field photos of the Anshan Group supracrustal rocks in Anben
图 3 鞍本地区鸡冠山乡BIF铁矿区鞍山群表壳岩的野外照片
a, b.白云片岩(A1437)；c, d.黑云变粒岩(A1504)；e, f.变质酸性火山岩(A1505)
Fig. 3. Field photos of the Anshan Group supracrustal rocks in Jiguanxiang BIF mine, Anben
图 4 鞍本地区鞍山群表壳岩的野外照片
a.表壳岩被2.5 Ga正长花岗岩脉切割，鸡冠山北；b.角闪变粒岩(A1225)，鸡冠山北；c.表壳岩被包裹于2.5 Ga正长花岗岩中，鸡冠山北西；d.黑云变粒岩(A1230)，鸡冠山北西；e~h.灯塔市八家子东，e.露头远景；f.黑云变粒岩发生皱褶变形，被包裹于深熔浅色体中，被花岗岩切割，g.黑云变粒岩被包裹于深熔浅色体中，h.黑云变粒岩(LN1333)
Fig. 4. Field photos of the Anshan Group supracrustal rocks in Anben
图 5 鞍本地区鞍山群表壳岩的野外照片
a~c.歪头山西南BIF铁矿区，a.BIF铁矿区远景，b.不同类型岩石相互关系，表壳岩被2.5 Ga正长花岗岩切割，c.斜长角闪岩(LN1331)；d.黑云变粒岩(A1241)，歪头山西南；e.黑云变粒岩(LN1332)，歪头山西；f.黑云变粒岩被花岗岩脉切割，歪头山西
Fig. 5. Field photos of the Anshan Group supracrustal rocks in Anben
图 6 鞍本地区鞍山群表壳岩的锆石阴极发光图像
a, b.黑云变粒岩(A1502)，眼前山铁矿；c, d.二云石英片岩(A1114)，弓长岭岭东矿区；e, f.黑云二长变粒岩(A1217)，连山关北
Fig. 6. Cathodoluminescence images of zircons from the Anshan Group supracrustal rocks in Anben
图 7 鞍本地区鞍山群表壳岩的锆石U-Pb谐和图
a.黑云变粒岩(A1502)，眼前山铁矿；b.二云石英片岩(A1114)，弓长岭岭东矿区；c.黑云二长变粒岩(A1217)，连山关北；d~f.鸡冠山乡BIF铁矿，d.白云片岩(A1437)，e.黑云变粒岩(A1504)，f.变质酸性火山岩(A1505)
Fig. 7. Concordia diagrams for SHRIMP U-Pb zircon analyses of the Anshan Group supracrustal rocks in Anben
图 8 鞍本地区鸡冠山乡BIF铁矿区鞍山群表壳岩的锆石阴极发光图像
a, b.白云片岩(A1437)；c, d.黑云变粒岩(A1504)；e, f.变质酸性火山岩(A1505)
Fig. 8. Cathodoluminescence images of zircons from the Anshan Group supracrustal rocks in Jiguanxiang BIF mine, Anben
图 9 鞍本地区鞍山群表壳岩的锆石阴极发光图像
a, b.角闪变粒岩(A1225)，鸡冠山北；c, d.黑云变粒岩(A1230)，鸡冠山北西；e, f.黑云变粒岩(LN1333)，灯塔八家子东
Fig. 9. Cathodoluminescence images of zircons from the Anshan Group supracrustal rocks in Anben
图 10 鞍本地区鞍山群表壳岩的锆石U-Pb谐和图
a.角闪变粒岩(A1225)，鸡冠山北；b.黑云变粒岩(A1230)，鸡冠山北西；c.黑云变粒岩(LN1333)，灯塔八家子东；d.斜长角闪岩(LN1331)，歪头山西南BIF铁矿区；e.黑云变粒岩(A1241)，歪头山西南；f.黑云变粒岩(LN1332)，歪头山西
Fig. 10. Concordia diagrams for SHRIMP U-Pb zircon analyses of the Anshan Group supracrustal rocks in Anben
图 11 鞍本地区鞍山群表壳岩的锆石阴极发光图像
a, b.斜长角闪岩(LN1331)，歪头山西南BIF铁矿区；c, d.黑云变粒岩(A1241)，歪头山西南；e, f.黑云变粒岩(LN1332)，歪头山西
Fig. 11. Cathodoluminescence images of zircons from the Anshan Group supracrustal rocks in Anben
图 12 华北克拉通地质简图
据Wan et al.(2016a)修改；图中给出了＞2.6 Ga古陆块分布和新太古代晚期和古元古代BIF空间分布；EAT.东部古陆块；SAT.南部古陆块；CAT.中部古陆块；中国地图据1:1亿中华人民共和国地图(审图号：GS(2016)1552号，国家测绘地理信息局监制)修改
Fig. 12. Geological sketch of the North China Craton
附表 1 鞍本地区鞍山群表壳岩的锆石SHRIMP U-Pb同位素年龄
附表 1. SHRIMP U-Pb data for zircons from the Anshan Group supracrustal rocks in Anben
黑云变粒岩(A1502) 数据点 206Pbc
(%)U
(10-6)Th
(10-6)Th/
U206Pb*
(10-6)207Pb*/
206Pb*±% 207Pb*/
235U±% 206Pb*/
238U±% 误差相关系数 206Pb/
238U年龄(Ma)207Pb/
206Pb年龄(Ma)不谐和度
(%)1.1 1.36 499 251 0.52 150 0.159 0 1.10 7.520 1.8 0.343 2 1.4 0.80 1 902 ±23 2 445 ±18 22 2.1 2.88 725 143 0.20 159 0.152 1 1.40 5.148 1.9 0.245 6 1.4 0.74 1 416 ±18 2 369 ±22 40 3.1 2.47 329 119 0.37 122 0.168 9 1.70 9.740 2.2 0.418 7 1.5 0.65 2 255 ±28 2 546 ±28 11 4.1 0.38 133 16 0.12 54 0.171 6 0.86 11.190 1.8 0.473 1 1.5 0.87 2 497 ±32 2 573 ±14 3 5.1 0.22 432 271 0.65 149 0.165 7 0.60 9.140 1.6 0.400 3 1.5 0.92 2 170 ±27 2 515 ±10 14 6.1 1.40 371 157 0.44 153 0.166 2 1.00 10.840 1.8 0.473 3 1.5 0.83 2 498 ±31 2 519 ±17 1 7.1 5.25 1 887 543 0.30 183 0.096 2 3.40 1.403 3.6 0.106 0 1.5 0.41 649 ± 9 1 549 ±61 58 8.1 0.95 158 146 0.95 67 0.169 1 1.10 11.400 1.9 0.489 3 1.6 0.83 2 567 ±34 2 548 ±18 -1 9.1 0.27 205 187 0.94 70 0.164 9 0.79 9.000 1.8 0.395 6 1.6 0.89 2 149 ±29 2 507 ±13 14 10.1 6.74 363 429 1.22 104 0.153 8 4.20 6.450 4.5 0.305 0 2.1 0.46 1 716 ±31 2 385 ±69 28 11.1 1.74 386 185 0.50 131 0.162 6 1.00 8.690 1.9 0.387 6 1.6 0.84 2 112 ±28 2 482 ±17 1 12.1 2.35 682 320 0.48 172 0.152 6 1.20 6.010 1.8 0.285 6 1.5 0.80 1 620 ±21 2 374 ±19 32 13.1 6.37 3 356 1 666 0.51 216 0.082 6 4.10 0.794 4.2 0.069 8 1.5 0.35 435 ± 6 1 259 ±78 65 14.1 -0.01 97 79 0.84 41 0.168 5 0.76 11.460 1.7 0.492 9 1.6 0.90 2 583 ±33 2 543 ±13 -2 15.1 0.13 288 420 1.51 105 0.168 6 0.63 9.840 1.7 0.423 4 1.6 0.93 2 276 ±30 2 544 ±11 11 云母石英片岩(A1114) 1.1 0.95 197 311 1.63 103 0.233 0 1.50 19.270 3.1 0.600 0 2.7 0.86 3 029 ±64 3 073 ±25 1 2.1 0.13 663 127 0.20 331 0.232 4 0.39 18.610 2.4 0.581 0 2.4 0.99 2 952 ±56 3 069 ± 6 4 3.1 0.58 2 803 639 0.24 380 0.103 1 10.00 2.233 2.4 0.157 1 2.2 0.91 940 ±19 1 681 ±18 44 4.1 0.33 1 644 465 0.29 346 0.151 0 1.00 5.090 2.4 0.244 3 2.2 0.91 1 409 ±28 2 357 ±17 40 5.1 0.28 2 805 529 0.19 381 0.099 4 0.68 2.162 2.2 0.157 7 2.1 0.95 944 ±19 1 613 ±13 41 6.1 0.39 1 651 486 0.30 297 0.158 3 0.73 4.560 2.3 0.208 8 2.2 0.95 1 223 ±24 2 438 ±12 50 7.1 0.35 2 281 721 0.33 337 0.103 9 0.87 2.455 2.3 0.171 4 2.1 0.93 1 020 ±20 1 694 ±16 40 8.1 0.37 733 246 0.35 239 0.201 4 0.73 10.520 2.3 0.378 9 2.2 0.95 2 071 ±39 2 838 ±12 27 9.1 0.35 2 192 811 0.38 386 0.120 5 0.78 3.389 2.3 0.204 0 2.2 0.94 1 197 ±23 1 964 ±14 39 10.1 0.32 705 651 0.95 267 0.205 7 0.76 12.440 2.3 0.438 8 2.2 0.95 2 345 ±44 2 872 ±12 18 11.1 0.34 1 467 582 0.41 342 0.162 8 0.96 6.060 2.4 0.270 1 2.2 0.92 1 541 ±30 2 485 ±16 38 12.1 0.12 891 191 0.22 391 0.219 7 0.51 15.450 2.3 0.510 0 2.2 0.97 2 657 ±48 2 979 ± 8 11 13.1 0.27 885 197 0.23 283 0.190 0 0.67 9.740 2.3 0.371 9 2.2 0.96 2 038 ±38 2 742 ±11 26 黑云二长变粒岩(A1217) 数据点 206Pbc
(%)U
(10-6)Th
(10-6)Th/
U206Pb*
(10-6)207Pb*/
206Pb*±% 207Pb*/
235U±% 206Pb*/
238U±% 误差相关系数 206Pb/
238U年龄(Ma)207Pb/
206Pb年龄(Ma)不谐和度
(%)1.1 0.00 139 53 0.39 56.9 0.163 4 1.10 10.720 3.7 0.476 0 3.5 0.95 2 509 ±72 2 492 ±19 -1 2.1 0.04 167 71 0.44 69.6 0.161 1 0.81 10.790 3.5 0.486 0 3.4 0.97 2 553 ±72 2 467 ±14 -3 3.1 0.00 352 151 0.44 137 0.160 2 0.57 9.970 3.3 0.451 0 3.3 0.99 2 401 ±66 2 458 ± 10 2 4.1 0.32 181 37 0.21 78.5 0.163 5 1.00 11.360 3.6 0.504 0 3.4 0.96 2 629 ±74 2 493 ±17 -5 5.1 0.11 276 363 1.36 84.2 0.155 5 0.74 7.590 4.0 0.354 0 3.9 0.98 1 953 ±66 2 407 ±13 19 6.1 0.05 667 449 0.70 158 0.145 4 0.69 5.510 3.5 0.274 8 3.5 0.98 1 565 ±48 2 293 ±12 32 7.1 0.04 434 297 0.71 144 0.154 2 0.56 8.190 3.4 0.385 0 3.4 0.99 2 101 ±60 2 393 ± 10 12 白云片岩(A1437) 1.1 0.64 1 329 1 277 0.99 144 0.179 4 0.63 3.106 1.2 0.125 5 1.0 0.85 762.4 ± 7 2 648 ±11 71 2.1 0.04 474 362 0.79 204 0.296 7 0.25 20.550 1.0 0.502 4 1.0 0.97 2 624 ±22 3 453 ± 4 24 3.1 0.40 1 012 710 0.73 165 0.145 0 0.49 3.782 1.3 0.189 2 1.2 0.92 1 117 ±12 2 287 ± 9 51 4.1 0.82 2 341 1 379 0.61 171 0.102 8 0.78 1.195 1.2 0.084 3 1.0 0.77 522 ± 5 1 676 ±14 69 5.1 0.25 864 189 0.23 142 0.182 6 0.86 4.815 1.3 0.191 2 1.0 0.75 1 128 ±10 2 677 ±14 58 6.1 0.67 744 373 0.52 112 0.163 1 0.56 3.922 1.1 0.174 4 1.0 0.87 1 036 ± 9 2 488 ± 10 58 7.1 0.03 238 138 0.60 84 0.165 2 0.58 9.330 1.3 0.409 8 1.1 0.89 2 214 ±21 2 510 ± 10 12 8.1 0.00 197 117 0.61 105 0.316 1 0.60 27.120 1.2 0.622 2 1.1 0.88 3 119 ±27 3 551 ± 9 12 9.1 0.14 276 435 1.63 92 0.163 5 0.46 8.750 1.2 0.388 0 1.1 0.92 2 114 ±19 2 492 ± 8 15 10.1 0.02 244 112 0.48 111 0.186 5 0.48 13.610 1.4 0.529 5 1.3 0.94 2 739 ±29 2 711 ± 9 -1 11.1 0.04 88 89 1.04 37 0.186 6 0.79 12.570 1.6 0.488 4 1.4 0.87 2 564 ±29 2 713 ±13 6 12.1 - 149 118 0.82 59 0.168 1 0.65 10.710 1.4 0.462 1 1.2 0.88 2 449 ±25 2 539 ±11 4 黑云变粒岩(A1504) 1.1 1.11 365 262 0.74 130 0.165 1 0.83 9.300 1.6 0.408 6 1.4 0.87 2 209 ±27 2 508 ±14 12 2.1 0.38 388 173 0.46 152 0.165 8 0.61 10.370 1.5 0.453 8 1.4 0.92 2 412 ±28 2 515 ±10 4 3.1 0.10 150 91 0.63 64 0.166 9 0.72 11.420 1.7 0.496 1 1.5 0.90 2 597 ±33 2 527 ±12 -3 4.1 0.00 228 105 0.48 94 0.165 8 0.65 10.930 1.6 0.477 9 1.5 0.91 2 518 ±31 2 516 ±11 0 5.1 0.28 168 141 0.87 60 0.167 0 0.82 9.480 1.7 0.411 8 1.5 0.87 2 223 ±27 2 528 ±14 12 6.1 0.07 292 172 0.61 130 0.168 0 0.57 11.970 1.5 0.516 8 1.4 0.93 2 685 ±30 2 538 ± 10 -6 9.1 1.30 423 317 0.77 131 0.164 9 1.50 8.020 2.1 0.352 9 1.4 0.68 1 949 ±24 2 506 ±25 22 7.1 0.58 79 61 0.80 33 0.168 6 1.10 11.230 1.9 0.483 0 1.6 0.82 2 540 ±33 2 544 ±19 0 8.1 0.39 293 224 0.79 98 0.162 0 0.69 8.620 1.6 0.385 9 1.4 0.90 2 104 ±25 2 476 ±12 15 10.1 0.81 358 238 0.69 116 0.163 9 0.76 8.390 1.6 0.371 6 1.4 0.88 2 037 ±25 2 496 ±13 18 11.1 3.95 312 140 0.46 112 0.180 5 1.90 9.840 2.3 0.396 1 1.6 0.67 2 151 ±29 2 655 ±29 19 12.1 0.23 257 200 0.81 94 0.165 5 0.65 9.740 1.6 0.427 0 1.4 0.91 2 292 ±28 2 513 ±11 9 13.1 0.33 381 302 0.82 119 0.1682 0.64 8.420 1.6 0.363 1 1.4 0.91 1 997 ±24 2 540 ±11 21 14.1 0.10 187 114 0.63 78 0.166 2 0.68 11.130 1.6 0.485 6 1.5 0.91 2 551 ±31 2 520 ±11 -1 15.1 0.05 238 140 0.61 98 0.167 0 0.61 11.060 1.6 0.480 5 1.4 0.92 2 530 ±30 2 527 ±10 0 16.1 0.03 104 88 0.87 44 0.166 8 0.88 11.320 1.8 0.492 0 1.6 0.87 2 579 ±34 2 526 ±15 -2 变质酸性火山岩(A1505) 数据点 206Pbc
(%)U
(10-6)Th
(10-6)Th/
U206Pb*
(10-6)207Pb*/
206Pb*±% 207Pb*/
235U±% 206Pb*/
238U±% 误差相关系数 206Pb/
238U年龄(Ma)207Pb/
206Pb年龄(Ma)不谐和度
(%)1.1 0.86 644 425 0.68 121 0.154 6 1.30 4.600 1.9 0.215 9 1.4 0.72 1 260 ±16 2 396 ±23 47 2.1 0.04 233 195 0.86 93 0.164 7 0.64 10.520 1.6 0.463 1 1.5 0.91 2 453 ±30 2 504 ±11 2 3.1 0.31 287 190 0.68 93 0.160 9 0.81 8.290 1.8 0.374 0 1.6 0.89 2 048 ±28 2 465 ±14 17 4.1 1.77 325 222 0.70 126 0.166 1 1.00 10.130 1.8 0.442 7 1.5 0.83 2 363 ±30 2 518 ±17 6 5.1 10.95 612 612 1.03 156 0.154 3 5.00 5.430 4.9 0.256 4 1.7 0.35 1 471 ±23 2 387 ±79 38 6.1 1.86 176 140 0.82 45 0.159 5 2.10 6.400 2.9 0.291 1 2.1 0.71 1 647 ±31 2 449 ±35 33 7.1 1.10 552 548 1.03 132 0.156 7 0.89 5.930 1.7 0.274 7 1.5 0.86 1 565 ±21 2 419 ±15 35 8.1 2.30 596 387 0.67 147 0.155 3 1.20 5.960 1.9 0.278 6 1.5 0.79 1 584 ±21 2 404 ±19 34 9.1 1.58 573 328 0.59 146 0.157 6 0.99 6.310 1.8 0.290 5 1.5 0.85 1 644 ±22 2 429 ±16 32 10.1 0.16 118 68 0.59 44 0.168 0 0.91 10.140 1.9 0.437 6 1.7 0.88 2 340 ±33 2 538 ±15 8 11.1 0.05 283 315 1.15 105 0.166 4 0.65 9.920 1.7 0.432 5 1.6 0.92 2 317 ±31 2 521 ±11 8 12.1 2.14 584 510 0.90 100 0.153 6 1.40 4.124 2.0 0.194 9 1.6 0.77 1 148 ±16 2 385 ±22 52 13.1 0.65 509 324 0.66 122 0.156 1 0.79 5.970 1.7 0.277 4 1.5 0.89 1 578 ±22 2 414 ±13 35 14.1 0.09 163 138 0.87 62 0.166 4 0.67 10.070 3.6 0.439 0 3.5 0.98 2 347 ±69 2 521 ±11 7 15.1 0.05 291 190 0.68 111 0.164 5 0.54 10.050 1.5 0.442 9 1.4 0.93 2 364 ±28 2 503 ± 9 6 角闪变粒岩(A1225) 1.1 0.07 197 110 0.58 82 0.165 2 0.76 11.000 3.5 0.483 0 3.4 0.98 2 541 ±71 2 510 ±13 -1 2.1 0.33 133 104 0.81 70 0.197 7 0.90 16.650 3.9 0.611 0 3.8 0.97 3 073 ±94 2 808 ±15 -9 2.2 0.07 217 20 0.09 99 0.191 5 0.56 14.090 3.3 0.533 0 3.2 0.99 2 756 ±72 2 756 ± 9 0 3.1 0.08 636 292 0.48 134 0.150 0 0.64 5.080 3.3 0.245 6 3.2 0.98 1 416 ±41 2 346 ±11 40 4.1 0.96 915 808 0.91 110 0.130 5 2.50 2.483 4.0 0.137 8 3.2 0.80 832 ±25 2 107 ±43 61 5.1 0.10 131 76 0.60 51 0.163 0 0.76 10.230 3.3 0.455 0 3.3 0.97 2 418 ±66 2 487 ±13 3 6.1 0.07 89 104 1.20 37 0.163 4 0.96 10.750 3.5 0.477 0 3.3 0.96 2 514 ±69 2 491 ±16 -1 7.1 0.03 377 58 0.16 77 0.156 2 0.68 5.120 3.3 0.237 5 3.2 0.98 1 374 ±40 2 415 ±12 43 8.1 0.08 73 38 0.53 32 0.167 2 1.30 11.800 3.7 0.512 0 3.5 0.94 2 664 ±76 2 530 ±22 -5 9.1 0.07 182 124 0.70 74 0.165 0 0.81 10.760 3.4 0.473 0 3.3 0.97 2 497 ±69 2 508 ±14 0 黑云变粒岩(A1230) 1.1 0.00 33 17 0.54 15 0.168 1 1.70 12.240 4.6 0.528 0 4.3 0.93 2 733 ±95 2 539 ±28 -8 1.2 0.28 316 193 0.63 92 0.156 6 0.72 7.280 3.9 0.337 0 3.9 0.98 1 873 ±63 2 420 ±12 23 2.1 0.15 126 134 1.10 57 0.165 7 1.10 11.910 4.1 0.521 0 4.0 0.97 2 704 ±88 2 515 ±18 -7 3.1 0.79 548 312 0.59 124 0.150 3 1.30 5.390 4.1 0.260 0 3.9 0.95 1 488 ±52 2 351 ±23 37 4.1 0.96 291 180 0.64 105 0.168 2 1.50 9.650 4.3 0.416 0 4.1 0.94 2 241 ±77 2 541 ±24 12 5.1 0.30 222 167 0.78 55 0.150 9 1.30 6.020 4.2 0.289 0 3.9 0.95 1 638 ±57 2 357 ±22 31 6.1 0.87 282 371 1.36 76 0.157 8 1.40 6.750 4.2 0.310 0 3.9 0.95 1 741 ±60 2 434 ±23 28 7.1 0.41 250 149 0.62 81 0.157 2 1.20 8.140 4.1 0.375 0 4.0 0.96 2 054 ±70 2 427 ±20 15 8.1 0.13 113 153 1.40 46 0.165 2 1.60 10.840 4.4 0.476 0 4.2 0.94 2 508 ±86 2 510 ±26 0 9.1 0.56 346 513 1.53 106 0.161 1 1.30 7.870 4.1 0.354 0 3.9 0.95 1 954 ±66 2 469 ±22 21 10.1 0.38 56 48 0.88 24 0.165 9 1.70 11.520 4.5 0.503 0 4.2 0.93 2 628 ±91 2 517 ±28 -4 黑云变粒岩(LN1333) 数据点 206Pbc
(%)U
(10-6)Th
(10-6)Th/
U206Pb*
(10-6)207Pb*/
206Pb*±% 207Pb*/
235U±% 206Pb*/
238U±% 误差相关系数 206Pb/
238U年龄(Ma)207Pb/
206Pb年龄(Ma)不谐和度
(%)1.1 0.02 200 152 0.78 82 0.165 9 0.55 10.890 1.2 0.475 9 1.1 0.89 2 510 ±22 2 517 ±9 0 2.1 0.17 214 142 0.68 81 0.165 3 0.38 10.030 1.1 0.440 0 1.0 0.94 2 351 ±21 2 511 ±6 6 3.1 0.06 268 225 0.87 97 0.163 9 0.33 9.460 1.2 0.418 7 1.2 0.96 2 255 ±22 2 496 ±6 10 4.1 0.05 257 121 0.49 101 0.168 6 0.31 10.670 1.2 0.458 8 1.1 0.96 2 434 ±23 2 544 ± 5 4 6.1 0.10 173 98 0.59 72 0.166 7 0.42 11.200 1.2 0.487 2 1.1 0.93 2 559 ±23 2 525 ± 7 -1 7.1 0.09 168 64 0.40 71 0.167 8 0.40 11.400 1.2 0.492 9 1.1 0.94 2 583 ±23 2 536 ± 7 -2 8.1 0.08 170 76 0.46 71 0.167 5 0.42 11.240 1.2 0.486 9 1.1 0.93 2 557 ±23 2 533 ± 7 -1 5.1 0.07 257 286 1.15 99 0.166 0 0.32 10.280 1.1 0.449 1 1.1 0.96 2 391 ±21 2 518 ± 5 5 9.1 0.07 125 55 0.46 52 0.167 3 0.46 11.060 1.2 0.479 4 1.1 0.93 2 525 ±24 2 531 ± 8 0 10.1 0.03 219 417 1.96 76 0.166 3 0.36 9.290 1.2 0.405 0 1.2 0.96 2 192 ±22 2 521 ±6 13 11.1 0.10 229 145 0.66 86 0.163 8 0.37 9.890 1.1 0.438 2 1.0 0.94 2 342 ±21 2 495 ±6 6 12.1 0.05 185 70 0.39 78 0.168 0 0.38 11.340 1.1 0.489 6 1.1 0.94 2 569 ±23 2 538 ±6 -1 斜长角闪岩(LN1331) 1.1 0.21 158 63 0.42 65 0.164 8 0.45 10.800 1.3 0.475 3 1.2 0.93 2 507 ±25 2 506 ± 8 0 2.1 0.12 162 80 0.51 67 0.163 8 0.40 10.930 1.2 0.483 9 1.1 0.94 2 544 ±23 2 496 ± 7 -2 3.1 0.03 207 53 0.26 85 0.164 5 0.36 10.840 1.1 0.478 0 1.1 0.95 2 519 ±22 2 502 ±6 -1 4.1 0.03 259 69 0.28 109 0.165 6 0.30 11.170 1.1 0.489 1 1.0 0.96 2 567 ±22 2 514 ± 5 -2 5.1 0.09 591 250 0.44 156 0.159 4 0.33 6.761 1.0 0.307 6 1.0 0.95 1 729 ±15 2 449 ±6 29 6.1 0.04 322 159 0.51 133 0.163 8 0.29 10.870 1.1 0.481 3 1.0 0.96 2 533 ±21 2 496 ± 5 -1 7.1 0.06 184 81 0.45 79 0.164 8 0.37 11.300 1.1 0.497 4 1.1 0.95 2 602 ±23 2 506 ±6 -4 8.1 0.09 126 50 0.41 51 0.164 9 0.47 10.580 1.2 0.465 4 1.1 0.92 2 463 ±23 2 506 ± 8 2 9.1 0.05 164 139 0.88 71 0.166 1 0.39 11.550 1.5 0.504 5 1.4 0.96 2 633 ±31 2 518 ± 7 -5 10.1 0.34 192 239 1.29 80 0.165 0 0.55 10.930 1.3 0.480 6 1.2 0.91 2 530 ±25 2 507 ± 9 -1 11.1 0.16 135 43 0.33 56 0.164 8 0.47 10.980 1.2 0.483 0 1.1 0.92 2 540 ±23 2 506 ± 8 -1 12.1 0.10 57 68 1.23 23 0.164 4 0.79 10.400 1.5 0.458 5 1.3 0.86 2 433 ±26 2 502 ±13 3 黑云变粒岩(A1241) 数据点 206Pbc
(%)U
(10-6)Th
(10-6)Th/
U206Pb*
(10-6)207Pb*/
206Pb*±% 207Pb*/
235U±% 206Pb*/
238U±% 误差相关系数 206Pb/
238U年龄(Ma)207Pb/
206Pb年龄(Ma)不谐和度
(%)1.1 0.20 901 692 0.79 221 0.244 4 0.71 9.590 3.3 0.284 5 3.2 0.98 1 614 ±46 3 149 ±11 49 2.1 0.06 822 530 0.67 113 0.207 7 0.44 4.560 3.2 0.159 3 3.2 0.99 953 ±28 2 888 ± 7 67 3.1 0.21 823 510 0.64 164 0.207 4 1.20 6.600 3.4 0.230 8 3.2 0.94 1 339 ±38 2 886 ±19 54 4.1 0.94 866 663 0.79 192 0.238 9 0.51 8.380 3.2 0.254 3 3.2 0.99 1 461 ±42 3 114 ± 8 53 5.1 0.16 682 476 0.72 208 0.274 5 0.33 13.390 3.2 0.354 0 3.2 0.99 1 952 ±54 3 332 ± 5 41 6.1 0.87 697 477 0.71 167 0.236 6 1.60 9.010 3.6 0.276 0 3.2 0.89 1 571 ±45 3 098 ±25 49 7.1 0.34 674 456 0.70 182 0.260 6 0.36 11.200 3.2 0.311 8 3.2 0.99 1 750 ±49 3 251 ± 6 46 8.1 0.03 938 614 0.68 248 0.262 4 0.35 11.110 3.2 0.307 0 3.2 0.99 1 726 ±48 3 261 ± 6 47 9.1 0.13 864 546 0.65 146 0.210 3 0.44 5.690 3.2 0.196 4 3.2 0.99 1 156 ±34 2 908 ± 7 60 10.1 0.53 811 397 0.51 165 0.218 9 0.63 7.100 3.2 0.235 3 3.2 0.98 1 362 ±39 2 973 ± 10 54 11.1 3.71 1 156 947 0.85 174 0.185 4 1.60 4.270 3.5 0.166 5 3.2 0.91 993 ±30 2 709 ±24 63 12.1 0.18 915 702 0.79 258 0.254 8 0.45 11.490 3.2 0.327 0 3.2 0.99 1 824 ±50 3 215 ± 7 43 黑云变粒岩(LN1332) 1.1 0.16 274 233 0.88 102 0.166 3 0.41 9.980 1.1 0.435 2 1.0 0.93 2 329 ±20 2 521 ±7 8 2.1 2.54 337 71 0.22 94 0.149 8 1.30 6.480 1.6 0.314 1 1.1 0.67 1 761 ±16 2 343 ± 20 25 3.1 0.08 163 108 0.68 68 0.164 8 0.50 11.070 1.2 0.487 4 1.1 0.91 2 559 ±24 2 505 ±9 -2 4.1 0.17 173 109 0.65 71 0.166 2 0.44 10.880 1.2 0.474 7 1.1 0.93 2 504 ±22 2 520 ±7 1 5.1 10.70 321 321 1.03 95 0.158 0 10.00 6.440 10.0 0.296 8 1.5 0.15 1 676 ±22 2 428 ±170 31 6.1 0.17 83 48 0.60 34 0.165 7 0.68 10.930 1.4 0.478 4 1.2 0.88 2 520 ±26 2 514 ±11 0 7.1 0.17 193 113 0.61 81 0.167 3 0.43 11.290 1.2 0.489 6 1.1 0.93 2 569 ±23 2 531 ±7 -2 8.2 1.11 343 327 0.99 78 0.158 4 5.80 5.690 5.9 0.260 9 1.1 0.18 1 494 ±14 2 438 ±98 39 8.1 0.24 162 188 1.20 58 0.163 9 0.65 9.320 1.3 0.412 3 1.1 0.86 2 225 ±20 2 497 ±11 11 9.1 3.09 160 170 1.09 44 0.163 1 1.90 6.920 2.2 0.308 1 1.2 0.53 1 732 ±18 2 487 ± 32 30 10.1 0.46 122 53 0.45 51 0.167 4 0.64 11.180 1.3 0.484 4 1.1 0.88 2 546 ±24 2 532 ±11 -1 11.1 0.09 155 132 0.88 64 0.166 3 0.44 11.090 1.2 0.483 7 1.1 0.93 2 543 ±23 2 521 ±7 -1 
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附表 2 鞍本地区表壳岩锆石年龄总结
附表 2. Summary of zircon U-Pb ages for the Anshan Group supracrustal rocks in Anben
顺序号 样品编号 岩石名称 位置 外来或碎屑锆石年龄(Ma) 岩浆锆石年龄
(Ma)变质锆石年龄
(Ma)定年方法 经纬度 数据来源 1 A1114 二云石英片岩 弓长岭岭东矿区 3 069±12 SHRIMP N41°05′49″/E123°32′6″ 本文 2 A1217 黑云二长变粒岩 连山关北 2 469±13 SHRIMP N41°00′11″/E123°44′51″ 本文 3 A1225 角闪变粒岩 鸡冠山乡北 2 756 2 502±13 SHRIMP N41°22′24″/E123°34′56″ 本文 4 A1230 黑云变粒岩 鸡冠山北西 2 519±23 SHRIMP N41°23′41″/E123°31′03″ 本文 5 A1241 黑云变粒岩 歪头山西南 3 490±110 SHRIMP N41°28′05″/E123°35′48″ 本文 6 LN1331 斜长角闪岩 歪头山西南 2 505±4 SHRIMP N41°28′04″/E123°35′57″ 本文 7 LN1332 黑云变粒岩 歪头山西 2 521±7 SHRIMP N41°29′51″/E123°32′22″ 本文 8 LN1333 黑云变粒岩 灯塔市八家子东 2 531±6 SHRIMP N41°26′36″/E123°33′58″ 本文 9 A1437 白云片岩 鸡冠山 2 711, 2 539 SHRIMP N41°18′11″/E123°35′22″ 本文 10 A1502 黑云变粒岩 眼前山 2 538±17 SHRIMP N41°04′23″/E123°08′07″ 本文 11 A1504 黑云变粒岩 鸡冠山 2 528±9 SHRIMP N41°18′07″/E123°35′16″ 本文 12 A1505 变质酸性火山岩 鸡冠山 2 514±9 SHRIMP N41°18′07″/E123°35′16″ 本文 13 WTS1-15 斜长角闪岩(变质基性岩脉) 歪头山 2 523±12 2 481±19 LA-ICP-MS Cui et al., 2013 14 CTG-7 片麻状绿泥石化黑云片
麻岩(绿泥石英片岩)陈台沟
(ZK26钻孔的负815m)2 608~2 733 2 551±10 2 469±23 LA-ICP-MS 代堰锫等，2013 15 G02-8 斜长角闪片岩 弓长岭 2 554±12 SHRIMP Han et al., 2014 16 A0420 黑云变粒岩 弓长岭 2 705, 2 911 2 528±10 SHRIMP 万渝生等，2012 17 ZK7921 黑云变粒岩 齐大山
(ZK7921钻孔的负207m)2 533±53 同位素稀释法 王守伦和张瑞华，1995 18 WTS-11 斜长角闪岩 歪头山 2 611±5，2 530±7 CAMECA 代堰锫等，2012 19 15YK30-1 绿泥片岩(变质英安岩) 鸡冠山东南 2 756±11 2 574±13 LA-ICP-MS Guo et al., 2017 20 15YK24-2 绿泥片岩(变质英安岩) 东鞍山 3 009, 2 609~2 612 2 560±7 LA-ICP-MS Guo et al., 2017 21 石英片岩，黑云变粒岩 齐大山 2 700~3 000 2 530~2 560 1 840~1 880 LA-ICP-MS Li et al., 2016 22 DNF4-3 绿泥角闪片岩 南芬铁矿区 2 552±18 2 482 LA-ICP-MS Zhu et al., 2015
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