ZIRCON U-PB AGE AND TECTONIC SETTING OF THE MIDDLE ORDOVICIAN INTRUSIVE ROCKS IN DUOBAOSHAN AREA, HEILONGJIANG PROVINCE
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摘要:
多宝山地区位于兴蒙造山带东段扎兰屯-多宝山岛弧构造带，早古生代地质体发育，且与区域成矿作用关系密切. 通过对多宝山地区中奥陶世侵入岩的岩相学、岩石地球化学、同位素年代学特征的研究，对其形成时代、构造环境及成矿作用进行了探讨. 定年结果显示花岗闪长岩LA-MC-ICP-MS锆石U-Pb年龄为488±3 Ma，形成时代为中奥陶世；岩浆物质来源以幔源为主，同熔了部分壳源物质，伴随强烈的构造热事件和岩浆侵入喷发活动，大量深源流体带来Au、Cu等成矿元素，在有利成矿条件和扩容空间下，形成多宝山铜（钼）矿床. 研究显示，中奥陶世花岗闪长岩形成于与板块俯冲有关的岛弧环境.
Abstract:The Duobaoshan area is located in Zhalantun-Duobaoshan island arc tectonic belt in the eastern section of Xing'an-Mongolian orogenic belt, with the Early Paleozoic geological bodies developed and closely related to regional mineralization. The formation age, tectonic setting and mineralization are discussed based on the study of petrography, lithogeochemistry and isotopic chronology of the Middle Ordovician intrusive rocks in Duobaoshan area. The LA-MC-ICP-MS zircon U-Pb age of granodiorites is 488±3 Ma, indicating that the granodiorites were formed in the Middle Ordovician. The magma source is mainly mantle origin with some crust-derived materials. With intensive tectonic thermal events and magmatic intrusion-eruption activities, a large number of deep fluids bring metallogenic elements such as Au and Cu to form Duobaoshan Cu-Mo deposit under favorable minerogenetic conditions and expanded space.
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Key words:
- granodiorite /
- zircon U-Pb age /
- tectonic setting /
- Middle Ordovician /
- Cu-Mo deposit /
- Heilongjiang Province
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表 1 样品D7046锆石U-Pb同位素测年数据表
Table 1. U-Pb isotopic dating data of zircons in sample D7046
测点 元素含量/10-6 206Pb/238U 207Pb/235U 207Pb/206Pb 208Pb/232Th 232Th/238U 206Pb/238U Pb U Th 比值 1σ 比值 1σ 比值 1σ 比值 1σ 比值 1σ 年龄/Ma 1σ 1 9.11 113.82 40.82 0.0785 0.0010 0.6208 0.0133 0.0574 0.0011 0.0262 0.0007 0.3586 0.002 487 6 2 9.84 121.77 43.20 0.0793 0.0011 0.6133 0.0139 0.0561 0.0012 0.0268 0.0007 0.3548 0.002 492 7 3 9.55 117.64 45.91 0.0793 0.0009 0.6157 0.0138 0.0563 0.0011 0.0255 0.0006 0.3903 0.002 492 6 4 7.57 94.33 35.92 0.0783 0.0010 0.6211 0.0152 0.0575 0.0013 0.0257 0.0007 0.3808 0.005 486 6 5 7.89 101.58 29.17 0.0785 0.0010 0.6193 0.0145 0.0572 0.0013 0.0233 0.0006 0.2872 0.002 487 6 6 7.18 91.88 29.59 0.0782 0.0009 0.6199 0.0136 0.0575 0.0012 0.0233 0.0006 0.3221 0.001 485 5 7 8.48 107.52 37.21 0.0789 0.0010 0.6197 0.0152 0.0570 0.0013 0.0220 0.0006 0.3461 0.002 490 6 8 10.41 128.73 55.60 0.0781 0.0010 0.6181 0.0136 0.0574 0.0011 0.0248 0.0006 0.4320 0.004 485 6 9 6.15 77.32 26.30 0.0794 0.0010 0.6200 0.0203 0.0566 0.0019 0.0233 0.0008 0.3402 0.005 493 6 10 11.14 135.43 64.57 0.0788 0.0010 0.6186 0.0136 0.0569 0.0011 0.0242 0.0006 0.4768 0.003 489 6 11 12.14 144.69 72.38 0.0788 0.0009 0.6291 0.0136 0.0579 0.0012 0.0268 0.0006 0.5003 0.009 489 6 12 8.16 104.27 35.98 0.0781 0.0009 0.6177 0.0128 0.0574 0.0011 0.0224 0.0005 0.3451 0.004 485 6 13 8.22 103.55 33.87 0.0785 0.0010 0.6199 0.0169 0.0573 0.0015 0.0263 0.0008 0.3271 0.003 487 6 14 14.65 180.79 84.46 0.0780 0.0010 0.6213 0.0130 0.0577 0.0010 0.0234 0.0005 0.4672 0.003 484 6 15 12.06 149.57 59.21 0.0787 0.0010 0.6235 0.0123 0.0575 0.0010 0.0248 0.0006 0.3959 0.003 488 6 16 6.59 83.82 26.97 0.0783 0.0010 0.6140 0.0151 0.0569 0.0013 0.0250 0.0007 0.3217 0.002 486 6 17 7.74 96.77 35.55 0.0787 0.0010 0.6241 0.0165 0.0575 0.0014 0.0246 0.0006 0.3673 0.002 488 6 18 10.60 127.03 70.27 0.0781 0.0012 0.6153 0.0169 0.0571 0.0012 0.0247 0.0010 0.5532 0.003 485 7 19 9.70 121.57 44.55 0.0786 0.0010 0.6090 0.0145 0.0562 0.0012 0.0248 0.0006 0.3664 0.004 488 6 20 7.89 100.01 32.93 0.0781 0.0010 0.6217 0.0147 0.0577 0.0012 0.0256 0.0006 0.3292 0.001 485 6 21 8.40 104.94 39.16 0.0786 0.0009 0.6105 0.0128 0.0563 0.0011 0.0248 0.0006 0.3731 0.004 488 6 22 13.55 163.73 80.29 0.0786 0.0010 0.6248 0.0136 0.0577 0.0012 0.0252 0.0006 0.4904 0.005 488 6 23 10.79 132.55 57.12 0.0789 0.0010 0.6161 0.0132 0.0566 0.0011 0.0244 0.0007 0.4309 0.005 490 6 24 9.25 114.65 44.12 0.0788 0.0010 0.6175 0.0133 0.0568 0.0011 0.0253 0.0007 0.3849 0.003 489 6 测试单位：中国地质调查局天津地质调查中心. 
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表 2 花岗闪长岩主量、稀土和微量元素分析结果表
Table 2. Contents of major, rare earth and trace elements in granodiorites
样品号 P109
Tc54P109
Tc58P114
Tc18P114
Tc32D7046 样品号 P109
Tc54P109
Tc58P114
Tc18P114
Tc32D7046 SiO2 66.52 67.26 65.6 65.02 64.64 Dy 1.59 2.1 2.59 2.96 2.29 TiO2 0.38 0.37 0.35 0.4 0.37 Ho 0.32 0.43 0.53 0.59 0.48 Al2O3 16.61 15.88 15.55 16.53 16.25 Er 1.01 1.23 1.6 1.71 1.45 Fe2O3 1.16 1.5 3.22 3.47 3.13 Tm 0.15 0.18 0.24 0.24 0.22 FeO 3.31 2.79 1.74 1.87 1.69 Yb 0.98 1.18 1.68 1.6 1.56 MnO 0.055 0.059 0.13 0.12 0.13 Lu 0.15 0.17 0.34 0.31 0.32 MgO 1.64 1.67 1.48 1.2 1.66 Y 6.8 8.74 14.3 16 13.3 CaO 0.63 1.15 3.26 0.76 3.2 δEu 0.91 0.9 0.92 0.82 0.96 Na2O 4.13 4.07 4.29 4.01 4.37 ΣREE 64.42 90.01 74.62 82.65 67.59 K2O 3.17 2.65 1.86 1.71 1.95 LREE 51.3 72.9 50.26 55.38 45.26 P2O5 0.19 0.2 0.16 0.18 0.15 HREE 6.32 8.37 10.06 11.27 9.03 Los 2.06 2.26 1.8 4.4 2.04 LR/HR 8.12 8.71 5 4.91 5.01 Total 97.795 97.599 97.64 95.27 97.54 La/Yb 10.71 12.8 3.61 1.53 4.68 A/CNK 2.09 2.02 1.65 2.55 1.71 （La/Yb）N 7.22 8.62 2.43 1.03 3.16 A/NK 2.28 2.36 2.53 2.89 2.57 Eu/Sm 0.29 0.28 0.3 0.27 0.31 MF 73.16 71.98 77.02 81.65 74.38 Sm/Nd 0.2 0.19 0.2 0.2 0.2 K2O+Na2O 7.3 6.72 6.15 5.72 6.32 Ce/Yb 25.31 28.81 14.05 17.06 12.95 Na2O/K2O 1.3 1.54 2.31 2.35 2.24 Rb 44 41 30 33 33 σ 2.27 1.86 1.67 1.49 1.85 Sr 226 217 524 265 500 AR 2.47 2.3 1.97 1.99 1.96 Ba 687 528 532 650 628 DI 80.4 79.48 72.63 78.69 71.98 Nb 7 7.1 3.5 5.1 3.6 SI 12.23 13.17 11.76 9.79 12.97 Ta 0.46 0.43 0.23 0.26 0.21 La 10.5 15.1 6.06 2.44 7.3 Zr 102 101 87 90 77 Ce 24.8 34 23.6 27.3 20.2 Hf 3.2 3.2 2.9 3.8 2.1 Pr 2.72 3.94 3.2 3.92 2.68 Th 3.06 3.41 0.21 0.42 0.35 Nd 10.6 15.9 13.8 17.3 11.9 Cr 31.4 24.9 8.97 16.3 11.9 Sm 2.08 3.09 2.77 3.49 2.42 Sc 9.79 9.54 9.49 10.7 10.5 Eu 0.6 0.87 0.83 0.93 0.76 U 1.03 1.15 2.44 2.73 2.68 Gd 1.86 2.71 2.66 3.36 2.34 Rb/Sr 2.14 13 1.03 2.09 1.44 Tb 0.26 0.37 0.42 0.5 0.37 Nb/Ta 21.56 19.71 9.32 7.89 11.9 测试单位：国土资源部哈尔滨矿产资源监督检测中心. 含量单位：主量元素为%，稀土和微量元素为10-6.
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