Discovery of Late Cretaceous Baoshan Porphyry Copper Deposit in Dayaoshan, Qinhang Metallogenic Belt: Constraints from Zircon U-Pb Age and Hf Isotope
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摘要: 钦杭成矿带是华南地区重要的斑岩铜成矿带.前人研究表明区内斑岩铜矿床主要形成于中-晚侏罗世(180~155 Ma), 含矿斑岩为壳-幔相互作用的产物.对区内新近发现的钦杭带西南段大瑶山地区的宝山斑岩铜矿床进行研究, 结果表明其成岩成矿时代集中在晚白垩世.其中, 隐伏含矿花岗斑岩体的锆石LA-ICP-MS U-Pb年龄为91.1±0.6 Ma(1σ), 出露地表不含矿的两个花岗斑岩锆石U-Pb年龄分别为91.3±0.8 Ma(1σ)和90.1±1.0 Ma(1σ).含矿斑岩和不含矿斑岩的锆石Hf同位素组成相似, 初始εHf(91 Ma)为-8.74~-5.13, 两阶段Hf模式年龄TDM2集中在1 210~1 394 Ma.以上U-Pb-Hf同位素分析结果表明, 宝山铜矿床是一个晚白垩世早期(约91 Ma)形成的斑岩型铜矿床, 其含矿斑岩体的成因可能与中元古代地壳物质的部分熔融有关.结合前人的研究成果可知, 钦杭成矿带存在两期斑岩铜矿床成矿作用, 分别为中-晚侏罗世和晚白垩世, 其中晚白垩世成矿作用可能与华南板块边缘后碰撞伸展构造背景有关; 钦杭带西南侧大瑶山及邻区可能广泛发育有与燕山晚期岩浆活动(80~100 Ma)有关的钨-钼-铜(金)多金属矿床.Abstract: The Qinzhou Bay-Hangzhou Bay suture zone is an important porphyry copper metallogenic belt in southern China. Previous studies suggest that the ages of regional diagenesis and mineralization are mainly concentrated in the Late-Middle Jurassic (180-155 Ma), and the ore-bearing granite porphyry shows distinctly crust-mantle contamination. The Baoshan copper deposit is a porphyry-type Cu deposit newly discovered in the Dayaoshan region in the southwestern of the Qinhang metallogenic belt in recent years. The granite porphyry is dominated as small stock into Sheshan granodiorite, including two outcropped and one concealed magmatic emplacement. And the copper ore body is all hosted in the Baoshan concealed granite porphyry. In this paper, laser ablation (MC)-ICPMS U-Pb dating and Hf isotopic compositions of zircons from three granite porphyry samples in the Baoshan copper deposit are presented. Highly precise U-Pb results indicate that zircons from one concealed and two outcropped granite porphyries give weighted mean 206Pb/238U age of 91.1±0.6 Ma (1σ), 91.3±0.8 Ma (1σ) and 90.1±1.0 Ma (1σ), respectively. And the zircons crystallized in the late Yanshannian granites give εHf (91 Ma) values ranging from -8.74 to -5.13 and Hf model ages (TDM2) of 1 210-1 394 Ma. U-Pb and Hf isotopic data can be interpreted as the crystallization time of these granites and the mineralization age, indicating it was formed in the ~91 Ma and may be developed by reworking of Mesoproterozoic crust closely related to partial melting. Together with other published geochronological data, it is proposed that the late Yanshannian magmatite and related Cu (Au)-W-Mo deposit are widely developed in the Dayaoshan and its adjacent areas. Moreover, two epochs of porphyry copper mineralization are confirmed in this study, including the Middle-Late Jurassic and the Late Cretaceous, in the Qinhang metallogenic belt, and it is concluded that Late Cretaceous mineralization possibly resulted from the post-collisional crustal extension setting in the continental margin of the South China.
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图 2 大瑶山社山地区宝山铜矿床区域地质简图
Fig. 2. Geological sketch of the Sheshan district, Dayaoshan, showing the location of the Baoshan porphyry Cu deposit
图 5 宝山斑岩铜矿床的矿物组成和结构特征
a.交错细脉状黄铜矿脉矿石;b.网脉状的石英-黄铁矿-黄铜矿脉矿石;c.稠密浸染状黄铜矿矿石;d.黄铜矿交代早期石英形成镶边结构;e.黄铜矿、黄铁矿呈脉状穿插;f.黄铜矿呈网脉状交代穿插早期形成的黄铁矿;g.黄铜矿与黄铁矿、闪锌矿密切共生;h.磁黄铁矿交代黄铜矿形成的交代残余结构,并与黄铁矿和闪锌矿共生;i.黝铜矿与黄铜矿、闪锌矿密切共生.Qz.石英;Ser.绢云母;Pl.斜长石;Py.黄铁矿;Ccp.黄铜矿;Sp.闪锌矿;Po.磁黄铁矿;Ttr.黝铜矿
Fig. 5. Photographs and micrographs showing mineralogy and texture of copper ores from the Baoshan porphyry Cu deposit
图 9 华南地区燕山晚期金属矿床时空分布特征
Fig. 9. Spatial-temporal distribution of late Yanshanian ore deposits in southern China
图 10 钦杭成矿带中-晚侏罗世和晚白垩世斑岩铜矿床的时空分布特征
Fig. 10. The spatial and temporal distribution of the Middle-Late Jurassic and the late Cretaceous porphyry copper deposits in the Qinhang metallogenic belt
表 1 社垌地区花岗斑岩LA-ICP-MS锆石U-Pb同位素分析结果
Table 1. LA-ICP-MS U-Pb data for zircons from the granite porphyry in the Shedong area
测试点号 Th(10-6) U(10-6) Th/U 207Pb/206Pb 207Pb/235U 206Pb/238U 207Pb/206Pb 207Pb/235U 206Pb/238U 比值 1σ 比值 1σ 比值 1σ 年龄(Ma) 1σ 年龄(Ma) 1σ 年龄(Ma) 1σ BS1 BS1-1 337 613 0.55 0.071 6 0.005 7 0.140 3 0.011 3 0.014 4 0.000 4 975.9 161.1 133.4 10.1 92.3 2.5 BS1-2 493 995 0.50 0.061 1 0.003 6 0.116 7 0.006 2 0.014 3 0.000 2 642.6 129.6 112.1 5.6 91.8 1.3 BS1-3 558 1 099 0.51 0.058 9 0.003 3 0.112 6 0.006 0 0.014 2 0.000 2 564.9 124.1 108.4 5.5 90.7 1.3 BS1-4 583 1 071 0.54 0.059 3 0.004 9 0.111 2 0.007 5 0.014 1 0.000 2 588.9 177.8 107.0 6.9 90.5 1.4 BS1-5 766 946 0.81 0.086 4 0.007 3 0.165 2 0.012 3 0.014 4 0.000 4 1 346.3 164.0 155.3 10.7 92.3 2.5 BS1-6 481 618 0.78 0.078 5 0.006 9 0.157 6 0.013 6 0.014 7 0.000 4 1 159.0 175.2 148.6 12.0 93.8 2.2 BS1-7 806 1 529 0.53 0.048 7 0.002 5 0.093 6 0.004 4 0.014 3 0.000 2 131.6 123.1 90.8 4.1 91.7 1.3 BS1-8 1 003 1 460 0.69 0.055 7 0.003 3 0.105 5 0.006 1 0.013 9 0.000 2 442.6 133.3 101.8 5.6 88.9 1.4 BS1-9 322 644 0.50 0.085 4 0.006 5 0.159 0 0.010 3 0.014 4 0.000 3 1 324.1 147.7 149.8 9.0 92.0 2.2 BS1-10 792 1 322 0.60 0.068 5 0.006 3 0.129 8 0.011 1 0.014 2 0.000 3 883.3 190.0 123.9 9.9 90.7 1.6 BS1-11 349 622 0.56 0.064 3 0.005 1 0.123 8 0.009 4 0.014 4 0.000 3 753.7 166.7 118.5 8.5 91.9 2.0 BS1-12 650 894 0.73 0.070 4 0.006 1 0.135 3 0.011 0 0.014 4 0.000 3 942.6 180.1 128.8 9.9 91.9 2.0 BS1-13 394 705 0.56 0.062 8 0.003 9 0.122 4 0.007 1 0.014 3 0.000 3 701.9 133.3 117.2 6.4 91.7 1.8 BS1-14 885 1 288 0.69 0.047 7 0.002 8 0.093 1 0.005 4 0.014 3 0.000 2 87.1 133.3 90.4 5.0 91.4 1.6 BS1-15 358 657 0.55 0.067 6 0.004 6 0.134 2 0.009 1 0.014 6 0.000 3 857.4 141.5 127.9 8.1 93.4 1.7 BS1-16 701 1 381 0.51 0.048 6 0.002 3 0.092 4 0.004 1 0.014 1 0.000 2 127.9 112.9 89.7 3.8 90.1 1.2 BS1-17 1 519 1 826 0.83 0.050 0 0.003 4 0.098 8 0.006 7 0.014 4 0.000 2 194.5 159.2 95.6 6.2 92.3 1.5 BS1-18 448 801 0.56 0.059 1 0.004 0 0.118 9 0.007 7 0.015 1 0.000 5 572.3 152.8 114.1 7.0 96.7 3.3 BS2 BS2-1 2 566 27 123 0.09 0.047 4 0.002 7 0.094 1 0.005 3 0.014 2 0.000 1 77.9 120.4 91.3 5.0 90.7 0.7 BS2-2 2 255 8 496 0.27 0.043 3 0.010 0 0.090 7 0.020 0 0.013 8 0.000 2 - - 88.2 18.6 88.2 1.3 BS2-3 882 1 913 0.46 0.012 0 0.010 8 0.068 0 0.030 3 0.014 6 0.000 3 - - 66.8 28.9 93.5 1.9 BS2-4 3 183 11 639 0.27 0.033 8 0.012 4 0.153 0 0.044 7 0.013 8 0.000 4 - - 144.6 39.3 88.3 2.7 BS2-5 1 894 2 894 0.65 0.052 6 0.013 0 0.111 3 0.025 6 0.013 9 0.000 3 322.3 468.5 107.2 23.4 88.7 2.0 BS2-6 1 135 1 688 0.67 0.012 6 0.017 6 0.023 1 0.028 9 0.013 1 0.000 6 - - 23.2 28.7 83.8 3.9 BS2-7 378 615 0.61 0.000 0 0.000 0 0.000 0 0.000 0 0.013 8 0.000 4 - - 0.0 0.0 88.3 2.4 BS2-8 2 651 4 314 0.61 0.063 2 0.004 2 0.130 5 0.007 9 0.014 4 0.000 3 716.7 141.5 124.5 7.1 91.9 1.6 BS2-9 465 2 481 0.19 0.158 5 0.003 1 10.232 9 0.233 2 0.465 5 0.007 3 2 439.8 32.7 2 456.1 21.1 2 463.6 31.9 BS2-10 1 967 10 925 0.18 0.059 5 0.012 7 0.140 6 0.023 3 0.014 1 0.000 3 587.1 474.0 133.6 20.8 90.0 1.8 BS2-11 342 604 0.57 0.045 9 0.007 9 0.177 4 0.030 2 0.026 7 0.001 0 - - 165.8 26.1 169.9 6.1 BS2-12 463 943 0.49 0.058 4 0.006 7 0.133 4 0.021 1 0.016 0 0.000 5 542.6 251.8 127.1 18.9 102.2 3.2 BS2-13 382 607 0.63 0.060 6 0.007 3 0.125 1 0.014 6 0.015 6 0.000 5 633.4 262.9 119.6 13.1 100.0 2.9 BS2-14 2 488 14 683 0.17 0.061 3 0.005 4 0.123 7 0.011 1 0.014 0 0.000 2 650.0 186.1 118.4 10.1 89.9 1.0 BS2-15 2 735 12 755 0.21 0.047 9 0.008 7 0.093 3 0.017 5 0.013 8 0.000 2 94.5 381.4 90.6 16.3 88.2 1.2 BS2-16 2 475 10 765 0.23 0.069 6 0.006 6 0.140 5 0.014 0 0.013 9 0.000 2 918.2 196.3 133.4 12.4 89.1 1.3 BS2-17 3 103 23 741 0.13 0.060 0 0.008 8 0.126 8 0.018 9 0.014 0 0.000 2 603.4 320.8 121.2 17.0 89.4 1.1 BS2-18 1 889 3 484 0.54 0.044 6 0.004 1 0.092 5 0.008 4 0.014 6 0.000 2 - - 89.8 7.8 93.4 1.3 BS3 BS3-1 590 1 044 0.57 0.057 9 0.001 9 0.559 4 0.018 2 0.070 3 0.001 1 527.8 71.1 451.1 11.9 437.7 6.4 BS3-2 1 246 3 368 0.37 0.048 1 0.001 9 0.094 2 0.003 4 0.014 2 0.000 2 105.6 90.7 91.4 3.1 91.1 1.0 BS3-3 1 205 3 952 0.30 0.048 9 0.001 5 0.095 5 0.002 8 0.014 2 0.000 1 142.7 67.6 92.6 2.6 90.8 0.9 BS3-4 961 1 435 0.67 0.048 4 0.003 0 0.093 1 0.005 6 0.014 1 0.000 2 120.5 137.0 90.4 5.2 90.2 1.1 BS3-5 1 595 1 955 0.82 0.049 3 0.002 6 0.097 6 0.005 3 0.014 3 0.000 3 161.2 124.1 94.6 4.9 91.4 1.9 BS3-6 742 1 019 0.73 0.061 4 0.004 4 0.123 5 0.009 3 0.014 4 0.000 3 653.7 149.1 118.2 8.4 92.3 1.6 BS3-7 138 416 0.33 0.068 2 0.002 1 1.234 7 0.038 4 0.132 1 0.001 9 875.9 64.8 816.5 17.5 800.1 10.8 BS3-8 551 2 072 0.27 0.049 0 0.002 0 0.097 9 0.004 1 0.014 4 0.000 2 150.1 93.5 94.8 3.8 92.1 1.0 BS3-9 467 889 0.53 0.055 7 0.003 1 0.105 2 0.005 4 0.014 2 0.000 2 438.9 122.2 101.6 5.0 90.9 1.5 BS3-10 782 3 053 0.26 0.052 2 0.001 9 0.103 5 0.003 8 0.014 4 0.000 2 294.5 89.8 100.0 3.5 92.0 1.2 BS3-11 602 2 071 0.29 0.050 5 0.002 4 0.098 6 0.004 7 0.014 2 0.000 2 216.7 111.1 95.5 4.3 90.8 1.3 BS3-12 1 442 7 470 0.19 0.048 8 0.001 5 0.095 6 0.003 0 0.014 1 0.000 2 139.0 74.1 92.7 2.7 90.3 1.2 BS3-13 1 089 3 337 0.33 0.045 3 0.001 6 0.087 8 0.003 1 0.014 0 0.000 2 - - 85.5 2.9 89.4 1.2 BS3-14 204 381 0.53 0.094 6 0.006 7 0.173 1 0.010 8 0.014 2 0.000 3 1 520.7 134.4 162.1 9.4 90.8 2.0 BS3-15 876 1 522 0.58 0.080 0 0.001 7 1.261 8 0.031 7 0.113 2 0.001 7 1 198.2 42.6 828.7 14.2 691.4 10.0 BS3-16 941 1 412 0.67 0.048 2 0.003 0 0.093 9 0.005 8 0.014 2 0.000 2 109.4 144.4 91.1 5.4 91.2 1.2 BS3-17 356 604 0.59 0.059 1 0.003 6 0.112 6 0.006 5 0.014 4 0.000 3 568.6 131.5 108.4 5.9 92.2 1.9 BS3-18 2 027 2 789 0.73 0.048 4 0.002 2 0.095 7 0.004 3 0.014 3 0.000 2 116.8 83.3 92.8 4.0 91.8 1.1 表 2 社垌地区花岗斑岩中锆石LA-MC-ICP-MS Hf同位素分析结果
Table 2. Hf isotope analyses of zircons from the granite porphyry in the Shedong area
测试点号 176Yb/177Hf 176Lu/177Hf 176Hf/177Hf ±2σ 年龄(Ma) εHf(0) εHf(t) ±2s TDM1(Ma) ±2s fLu/Hf TDM2(Ma) ±2s U-Pb分析点 BS1 BS1-1 0.029 585 206 0.000 681 074 0.282 511 663 0.000 010 91.8 -9.2 -7.2 0.3 1 039 27 -0.98 1 319 44 2 BS1-2 0.018 353 393 0.000 439 082 0.282 503 085 0.000 010 90.7 -9.5 -7.6 0.3 1 045 27 -0.99 1 334 43 3 BS1-3 0.026 595 537 0.000 613 363 0.282 502 159 0.000 009 90.5 -9.5 -7.6 0.3 1 051 26 -0.98 1 336 42 4 BS1-4 0.030 467 614 0.000 698 217 0.282 499 691 0.000 010 92.3 -9.6 -7.7 0.3 1 057 27 -0.98 1 340 43 5 BS1-5 0.046 862 822 0.001 048 963 0.282 543 741 0.000 008 91.7 -8.1 -6.1 0.3 1 004 24 -0.97 1 262 38 7 BS1-6 0.052 766 262 0.001 174 678 0.282 540 928 0.000 009 92.0 -8.2 -6.2 0.3 1 012 25 -0.96 1 267 39 9 BS1-7 0.029 535 598 0.000 685 796 0.282 499 960 0.000 009 90.7 -9.6 -7.7 0.3 1 056 26 -0.98 1 340 42 10 BS1-8 0.030 360 205 0.000 710 995 0.282 526 147 0.000 009 91.9 -8.7 -6.7 0.3 1 020 25 -0.98 1 293 41 11 BS1-9 0.026 972 516 0.000 625 810 0.282 472 657 0.000 009 91.9 -10.6 -8.6 0.3 1 092 25 -0.98 1 389 41 12 BS1-10 0.043 962 504 0.001 021 778 0.282 480 508 0.000 009 91.4 -10.3 -8.4 0.3 1 093 25 -0.97 1 376 40 14 BS1-11 0.056 051 719 0.001 249 261 0.282 542 123 0.000 010 90.1 -8.1 -6.2 0.4 1 012 28 -0.96 1 266 44 16 BS1-12 0.044 915 100 0.001 002 886 0.282 529 647 0.000 008 92.3 -8.6 -6.6 0.3 1 023 23 -0.97 1 287 37 17 BS2 BS2-1 0.029 504 654 0.000 674 539 0.282 511 666 0.000 009 90.7 -9.2 -7.3 0.3 1 039 25 -0.98 1 319 39 1 BS2-2 0.167 285 140 0.003 589 543 0.282 498 292 0.000 008 88.2 -9.7 -8.0 0.3 1 146 24 -0.89 1 352 36 2 BS2-3 0.138 222 098 0.002 863 177 0.282 500 751 0.000 007 93.5 -9.6 -7.7 0.3 1 119 22 -0.91 1 344 33 3 BS2-4 0.037 655 113 0.000 902 188 0.282 470 560 0.000 005 88.3 -10.7 -8.8 0.2 1 103 15 -0.97 1 395 23 4 BS2-5 0.027 330 229 0.000 663 376 0.282 494 248 0.000 006 88.7 -9.8 -7.9 0.2 1 063 18 -0.98 1 351 29 5 BS2-6 0.025 658 337 0.000 629 880 0.282 497 614 0.000 007 83.8 -9.7 -7.9 0.2 1 058 19 -0.98 1 346 31 6 BS2-7 0.048 157 929 0.001 088 349 0.282 484 063 0.000 006 88.3 -10.2 -8.3 0.2 1 090 18 -0.97 1 371 29 7 BS2-8 0.027 024 475 0.000 662 325 0.282 477 141 0.000 006 91.9 -10.4 -8.5 0.2 1 087 18 -0.98 1 381 28 8 BS2-9 0.069 965 101 0.001 519 036 0.280 971 270 0.000 006 2 463.6 -63.7 -11.1 0.2 3 215 16 -0.95 3 415 26 9 BS2-10 0.137 161 931 0.002 965 278 0.282 497 768 0.000 006 89.9 -9.7 -7.9 0.2 1 126 19 -0.91 1 351 28 14 BS2-11 0.080 257 895 0.001 584 024 0.282 495 144 0.000 008 88.2 -9.8 -8.0 0.3 1 088 22 -0.95 1 352 34 15 BS2-12 0.157 061 829 0.003 447 804 0.282 514 917 0.000 007 89.4 -9.1 -7.3 0.3 1 116 22 -0.90 1 321 32 17 BS2-13 0.083 185 298 0.001 713 157 0.282 477 905 0.000 006 93.4 -10.4 -8.5 0.2 1 117 17 -0.95 1 382 26 18 BS3 BS3-1 0.038 334 603 0.000 874 628 0.282 422 136 0.000 008 437.7 -12.4 -3.0 0.3 1 170 21 -0.97 1 381 34 1 BS3-2 0.095 609 284 0.002 248 220 0.282 569 603 0.000 008 91.1 -7.2 -5.3 0.3 1 000 24 -0.93 1 219 37 2 BS3-3 0.095 243 013 0.002 262 837 0.282 560 071 0.000 008 90.8 -7.5 -5.6 0.3 1 014 24 -0.93 1 236 37 3 BS3-4 0.040 223 513 0.000 949 194 0.282 500 233 0.000 008 90.2 -9.6 -7.7 0.3 1 063 21 -0.97 1 341 34 4 BS3-5 0.032 618 561 0.000 782 086 0.282 516 584 0.000 007 91.4 -9.0 -7.1 0.2 1 035 19 -0.98 1 310 31 5 BS3-6 0.080 545 969 0.001 922 978 0.282 533 529 0.000 009 92.3 -8.4 -6.5 0.3 1 043 25 -0.94 1 283 39 6 BS3-7 0.042 903 161 0.001 025 361 0.282 521 673 0.000 008 92.1 -8.9 -6.9 0.3 1 035 22 -0.97 1 302 35 8 BS3-8 0.037 522 736 0.000 876 529 0.282 514 342 0.000 009 90.9 -9.1 -7.2 0.3 1 041 24 -0.97 1 315 38 9 BS3-9 0.029 839 358 0.000 710 579 0.282 512 016 0.000 009 92.0 -9.2 -7.2 0.3 1 040 24 -0.98 1 318 38 10 BS3-10 0.043 303 571 0.000 974 822 0.282 488 628 0.000 010 90.8 -10.0 -8.1 0.3 1 080 27 -0.97 1 362 44 11 BS3-11 0.027 287 773 0.000 635 586 0.282 493 117 0.000 008 90.3 -9.9 -7.9 0.3 1 064 23 -0.98 1 353 37 12 BS3-12 0.031 453 080 0.000 743 271 0.282 488 159 0.000 008 89.4 -10.0 -8.1 0.3 1 074 23 -0.98 1 362 37 13 BS3-13 0.071 859 173 0.001 627 517 0.282 573 233 0.000 009 90.8 -7.0 -5.1 0.3 978 26 -0.95 1 211 41 14 BS3-14 0.044 186 948 0.001 033 210 0.282 497 419 0.000 010 91.2 -9.7 -7.8 0.4 1 069 29 -0.97 1 346 46 16 BS3-15 0.041 845 850 0.000 971 087 0.282 515 080 0.000 009 92.2 -9.1 -7.1 0.3 1 043 26 -0.97 1 313 41 17 BS3-16 0.039 798 846 0.000 905 322 0.282 497 919 0.000 010 91.8 -9.7 -7.7 0.4 1 065 28 -0.97 1 344 45 18 -
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