Zircon U-Pb geochronology and trace elements geochemistry of Hiltaba Suite in the north of Moonta-Wallaroo mining district, Yorke Peninsula, Gawler Craton, Australia
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摘要:
澳大利亚南澳州高勒克拉通广泛发育的Hiltaba岩套与该地区的铁氧化物铜金矿床关系密切，查明该岩套的成岩时代、成岩温度及构造背景，对铁氧化物铜金矿床的研究至关重要。对约克半岛Moonta-Wallaroo矿集区北部的眼球状花岗岩进行锆石U-Pb测年，测得年龄为1589±43 Ma，与前人确定的Hiltaba岩套岩浆事件（1595~1575 Ma）时间一致。通过锆石Ti温度计计算出花岗岩成岩温度为848~971℃，平均878℃，接近A型花岗岩的成岩温度。锆石的稀土元素配分模式呈现轻稀土元素亏损、重稀土元素富集及向左倾斜的特征，具有明显的正Ce异常和负Eu异常，δCe值变化范围较大（4.85~107.63），δEu值变化范围较小（0.17~0.36）。在锆石Y-Yb/Dy等判别图解中，样品多落入板内构造环境范围及附近，少数落入火山弧构造环境范围及附近；在锆石Hf-U/Yb等判别图解中，样品均落入陆壳环境范围。综合分析认为，该花岗岩形成于活动大陆边缘向陆内环境演变的构造背景。
Abstract:The Hiltaba Suite is widely developed in the Gawler Craton, South Australia, which is closely related to the IOCG deposits in the area. It is very important to find out the diagenetic age, diagenetic temperature and tectonic setting of the suite for the study of IOCG deposits. Zircon U-Pb dating of the augen granite collected from the north of the Moonta-Wallaroo mining district in the York Peninsula shows that the age is 1589 ±43 Ma, which is consistent with the magmatic event (1595~1575 Ma) of the Hiltaba Suite determined by previous geologists. According to zircon Ti thermometer, the diagenetic temperature of granite is 848~971℃, with an average of 878℃, which is close to that of A-type granite. The rare earth element patterns of zircon show the characteristics of LREE loss, HREE enrichment and left-dip, with obvious positive Ce anomaly and negative Eu anomaly, δCe varies widely (4.85~107.63) and δEu varies small (0.17~0.36). In the zircon Y-Yb/Dy and other discriminant diagrams, most of the samples fall within and near the within plate tectonic environment, and a few fall within and near the volcanic arc tectonic environment. In the zircon Hf-U/Yb and Y-Yb/Dy discriminant diagrams, the samples fall within the continental crust environment. Comprehensive analysis shows that the granite was formed in the tectonic setting of the evolution from the active continental margin to the intracontinental environment.
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Key words:
- Gawler Craton /
- IOCG deposits /
- Hiltaba Suite /
- diagenetic age /
- diagenetic temperature /
- tectonic setting
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表 1 眼球状花岗岩中代表性锆石LA-ICP-MS U-Th-Pb测试结果
Table 1. LA-ICP-MS U-Th-Pb data of representative zircons in the augen granite
点号 含量/10-6 Th/U 同位素比值 年龄/Ma Th U 207Pb/206Pb 1 σ 207Pb/235U 1 σ 206Pb/238U 1 σ 207Pb/206Pb 1 σ 207Pb/235U 1 σ 206Pb/238U 1 σ 1 342 621 0.55 0.0966 0.0023 3.3944 0.0826 0.2516 0.0033 1559 44 1503 19 1447 17 2 307 488 0.63 0.0979 0.0022 3.7373 0.0832 0.2739 0.0033 1584 43 1579 18 1560 17 3 451 974 0.46 0.0953 0.0020 3.3399 0.0694 0.2509 0.0029 1544 40 1490 16 1443 15 4 131 150 0.88 0.0970 0.0025 4.0733 0.1018 0.3018 0.0041 1566 48 1649 20 1700 20 5 239 490 0.49 0.0979 0.0023 3.6270 0.0793 0.2654 0.0031 1585 43 1555 17 1517 16 6 81 96 0.84 0.0959 0.0028 3.9585 0.1151 0.2967 0.0049 1546 49 1626 24 1675 24 7 454 535 0.85 0.0986 0.0028 3.7424 0.0969 0.2721 0.0037 1598 54 1580 21 1552 19 8 466 742 0.63 0.0976 0.0026 3.5643 0.1082 0.2611 0.0057 1589 51 1542 24 1495 29 9 401 881 0.46 0.0992 0.0028 3.7575 0.0941 0.2715 0.0038 1610 47 1584 20 1549 19 10 254 400 0.63 0.0981 0.0025 4.2550 0.1022 0.3117 0.0046 1588 48 1685 20 1749 22 11 279 429 0.65 0.0978 0.0023 4.1256 0.0965 0.3024 0.0041 1583 44 1659 19 1703 20 12 478 979 0.49 0.0971 0.0022 3.2652 0.0769 0.2411 0.0033 1569 42 1473 18 1392 17 13 366 607 0.60 0.0980 0.0021 3.7823 0.0774 0.2774 0.0030 1587 41 1589 16 1578 15 14 307 682 0.45 0.0980 0.0023 3.4856 0.0956 0.2558 0.0051 1587 43 1524 22 1469 26 15 373 570 0.65 0.0986 0.0023 4.0140 0.0912 0.2930 0.0033 1598 43 1637 19 1656 17 
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表 2 眼球状花岗岩中代表性锆石微量元素含量
Table 2. Trace element compositions of representative zircons in the augen granite
点号 La Ce Pr Nd Sm Eu Gd Tb Dy Ho Er Tm Yb Lu Y Hf Nb Ta ΣREE ΣLREE ΣHREE δEu δCe 1 1.84 61.3 2.83 20.7 33.9 8.00 113 33.4 311 90.9 351 68.2 627 113 2676 12228 8.98 5.26 1837 129 1708 0.36 5.33 2 0.97 51.6 0.89 6.36 8.05 1.77 32.7 11.8 128 45.0 196 42.2 395 76.8 1300 11434 7.87 4.32 997 70 927 0.29 12.58 3 1.77 85.6 2.17 11.3 11.8 2.57 35.6 12.5 133 45.8 209 46.9 463 92.4 1361 12850 10.7 5.59 1154 115 1039 0.35 9.22 4 0.68 29.4 0.29 3.10 5.64 1.06 24.4 8.09 92.8 34.9 153 31.4 287 56.0 996 10298 3.66 1.69 727 40 687 0.24 16.35 5 0.83 49.5 1.45 12.5 17.8 4.74 72.7 21.0 186 54.3 206 41.3 383 73.9 1619 12009 7.74 4.03 1125 87 1039 0.35 8.61 6 2.01 23.1 0.67 5.77 7.18 1.60 28.3 8.73 95.4 34.5 149 29.8 267 52.5 996 9958 3.39 1.67 705 40 665 0.30 4.85 7 1.66 64.2 2.12 19.1 27.6 7.18 114 33.4 314 92.0 341 64.2 550 102 2732 10079 6.93 3.29 1732 122 1610 0.34 7.14 8 0.88 104 1.08 7.16 8.26 1.54 29.4 10.6 126 46.4 217 47.4 462 93.2 1374 11539 10.3 5.43 1154 123 1032 0.27 22.50 9 0.85 56.0 1.09 8.45 12.2 3.06 44.8 14.1 140 44.1 190 41.4 410 83.0 1332 13084 9.24 5.37 1050 82 968 0.36 12.13 10 0.02 37.4 0.10 1.48 2.95 0.48 15.6 5.61 69.1 27.6 134 30.5 301 62.8 845 11482 6.93 4.11 688 42 646 0.17 107.63 11 0.07 47.9 0.23 2.71 4.26 0.98 23.1 7.77 89.9 34.3 160 35.1 339 69.3 1026 11477 7.20 3.90 814 56 758 0.24 58.59 12 2.10 108 1.64 8.47 7.76 1.83 27.7 9.43 109 39.9 192 44.0 445 94.1 1246 12913 10.1 6.35 1090 130 960 0.34 13.54 13 0.22 52.3 0.37 2.98 4.26 0.86 19.7 7.27 86.1 32.7 156 35.7 353 74.3 985 11777 8.36 4.64 825 61 764 0.24 35.87 14 0.99 52.7 1.52 11.1 17.8 4.42 72.2 21.0 201 60.9 257 58.2 545 105 1821 12174 11.3 6.25 1408 89 1319 0.33 8.55 15 0.15 43.9 0.30 2.75 4.54 0.86 23.8 8.49 99.1 39.2 181 39.2 374 76.3 1158 11651 9.11 4.71 894 53 842 0.20 38.41 注：微量元素含量单位为10-6
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表 3 锆石Ti温度计计算结果
Table 3. Calculation results of zircon Ti thermometer
点号 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 T/℃ 870 867 859 927 859 971 899 872 848 874 875 858 865 858 866
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