LA-ICP-MS zircon U-Pb age and petrochemical characteristics of magmatite from the Dadonggou gold deposit in east Liaoning
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摘要:
大东沟金矿位于华北克拉通北缘东段。对矿区内的岩浆岩进行了锆石U-Pb年代学和岩石地球化学研究。用LAICP-MS方法，测得花岗闪长岩和石英闪长岩中锆石207Pb/206Pb年龄加权平均值分别为2147±10Ma和140.8±1.2Ma，花岗闪长岩经历了1874±18Ma的后期热液活动事件。元素地球化学测试结果显示，两者均为高钾钙碱性I型花岗岩类。石英闪长岩稀土元素配分模式为明显的右倾模式，具有弱负Eu异常，而花岗闪长岩为平坦的右倾模式，具有明显的正Eu异常，两者呈现轻稀土相对富集的特征。微量元素均富集Rb、Ba、K等大离子亲石元素。石英闪长岩表现为亏损Nb、Ta、Zr、Hf、Ti等高场强元素，而花岗闪长岩表现为Th、Nb、Ta、Ti等高场强元素亏损。结合区域大地构造背景及相关研究认为，花岗闪长岩形成于大陆弧后盆地的构造背景，主要是由约2.2Ca的岩浆底侵加热导致下地壳基性火成岩部分熔融而成；石英闪长岩形成于伊佐奈岐板块向华北板块斜向俯冲的构造背景，具有壳幔混合的特征，为俯冲带流体交代地幔，使其部分熔融，形成基性岩浆与地壳熔融物质混合而成的产物。
Abstract:The Dadonggou gold deposit is located in the east of the northern margin of North China craton.In this paper, zircon UPb chronology and petrochemistry of magmatite from the Donggou gold deposit were studied. The LA-ICP-MS method was used and the ages of zircon in granodiorite and quartz diorite are 2147±10Ma(207Pb/206Pb age-weighted mean, n=17, MSWD=0.59) and 140.8 ±1.2Ma(206Pb/238U age-weighted mean, n=22, MSWD=0.48) respectively; nevertheless, the granite diorite experienced late hydrothermal events of 1874 ±18Ma.Elemental geochemical test results show that both granodiorite and quartz diorite are high potassium calc-alkaline I type granite. Quartz diorite is a right-dipping model with weak negative Eu anomalies, but granodiorite is a relatively flat right-dipping model with obvious positive Eu anomalies; they both show characteristics of relatively rich light rare earth elements. As for trace elements, they are all enriched in large ion lithophile elements Rb, Ba and K. Quartz diorite is characterized by depletion of high field strength elements such as Nb, Ta, Zr, Hf and Ti, but the granodiorite shows the depletion of high field strength elements such as Th, Nb, Ta and Ti. Combined with regional tectonic evolution and related studies, the authors have reached the conclusion that granodiorite was formed in the tectonic background of continental back-arc basin, mainly caused by partial melting of the lower crustal igneous rocks due to the magmatic heating action of ~2.2Ca. However, quartz diorite was formed in the tectonic background of the oblique subduction of Izanagi plate to the North China plate, which had the feature of crust-mantle mixing.It was the fluid metasomatic mantle in the subduction zone, and the basic magma formed by partial melting was mixed with the crust molten material.
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致谢: 在野外工作期间辽宁省第五地质队有限责任公司刘显高高级工程师给予了悉心指导和帮助，锆石U-Pb同位素测试由中国地质科学院国家地质实验测试中心的赵令浩博士完成，审稿专家对本文进行了细致的审阅并提出了大量建设性修改意见，在此一并表示感谢。
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图 1 辽东古元古代裂谷地质构造简图（据参考文献[1]修改）
1—太古宙古陆；2—北缘斜坡；3—中央凹陷；4—南缘浅台；5—构造岩相带界线；6、7—吕梁旋回主要背斜与向斜；8—郯庐断裂系；9—地名
Figure 1. Simplified geological-structural map of Liaodong Paleoproterozoic rift
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图 2 大东沟金矿地质图
1—第四系；2—灰色矿化绢云千枚岩；3—深灰色绢云千枚岩；4—含炭绢云千枚岩；5—含绿泥绢云千枚岩；6—变质石英砂岩；7—黑云母化绢云千枚岩；8—黑云母角岩；9—黑云母石英闪长岩；10—花岗闪长岩；11—云英岩；12—钠长斑岩；13—水库；14—性质不明断层；15—挤压破碎带；16—采样位置；17—勘探线位置及编号；18—钻孔位置及编号；19—村庄
Figure 2. Geological map of the Dadonggou gold deposit
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图版Ⅰ
a.花岗闪长岩；b.花岗闪长岩镜下照片（－）；c.花岗闪长岩镜下照片（+）；d.石英闪长岩；e.石英闪长岩中的暗色包体；f.石英闪长岩镜下照片（+）。Q—石英；Pl—斜长石；Bi—黑云母；Aml—角闪石；Chl—绿泥石
图版Ⅰ.
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图 3 花岗闪长岩（DD08）和石英闪长岩（DD09）锆石阴极发光图像及U-Pb年龄
（DD08为207Pb/206Pb年龄，DD09为206Pb/238U年龄）
Figure 3. The cathodoluminescence images and U-Pb ages of zircon grains for granodiorite (DD08) and quartz diorite (DD09)
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图 4 大东沟矿区岩浆岩锆石U-Pb谐和图及年龄
Figure 4. Zircon U-Pb condordia diagrams and weighted average age diagrams of magmatite from the Dadonggou deposit
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图 6 大东沟矿区岩浆岩稀土元素球粒陨石标准化图解（a）和微量元素原始地幔标准化蛛网图（b）（标准化数值据参考文献[13]）
Figure 6. Chondrite-normalized REE patterns (a) and primitive mantle-normalized trace element spider diagrams(b) of magmatite from the Dadonggou deposit
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图 8 大东沟花岗闪长岩源区岩石判别图解
Figure 8. Discrimination diagram of source rocks for granodiorite from the Dadonggou deposit
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图 9 大东沟矿区岩浆岩Y-Nb（a）和（Y+Nb）-Rb（b）构造环境图解[42]
VAG—火山弧花岗岩；syn-COLG—同碰撞花岗岩；WPG—板内花岗岩；ORG—洋脊花岗岩
Figure 9. Y-Nb (a) and (Y+Nb)-Rb (b) diagrams of tectonic discrimination of magmatite from the Dadonggou deposit
表 1 大东沟金矿区花岗闪长岩和石英闪长岩锆石U-Th-Pb同位素测试结果
Table 1 The zircon U-Th-Pb isotopic test results for granodiorite and quartz diorite in the Dadonggou gold deposit
测点号 含量/10-6 Th/U 同位素比值 年龄/Ma Pb Th U 207Pb/235U 1σ 206Pb/238U 1σ 207Pb/206Pb 1σ 207Pb/235U 1σ 206Pb/238U 1σ 207Pb/206Pb 1σ DD08-1 351 54 63 0.87 7.96461 0.18704 0.43743 0.00615 0.1349 0.00174 2227 21 2339 28 2163 22 2 2623 516 590 0.87 5.29804 0.07447 0.33184 0.00445 0.11465 0.00118 1869 12 1847 22 1874 18 3 197 34 48 0.71 7.32554 0.29407 0.40871 0.00653 0.13393 0.00258 2152 36 2209 30 2150 33 4 307 38 56 0.69 8.26433 0.17607 0.45327 0.00627 0.13379 0.00163 2260 19 2410 28 2148 21 5 593 91 93 0.98 7.66163 0.13664 0.42445 0.00577 0.13272 0.00149 2192 16 2281 26 2134 20 6 517 69 98 0.71 7.55391 0.15626 0.4103 0.00565 0.13229 0.00161 2179 19 2216 26 2129 21 7 258 39 66 0.60 7.07075 0.1314 0.39822 0.00543 0.13329 0.00155 2120 17 2161 25 2142 20 8 724 99 131 0.76 7.03708 0.17647 0.38628 0.00548 0.13714 0.00189 2116 22 2106 25 2191 24 9 750 116 125 0.93 6.94606 0.1178 0.36792 0.00497 0.13414 0.00149 2105 15 2020 23 2153 19 10 827 129 141 0.91 7.6063 0.15172 0.42351 0.00579 0.13358 0.00159 2186 18 2276 26 2146 21 11 466 99 91 1.08 7.1141 0.13686 0.41021 0.00558 0.13203 0.00157 2126 17 2216 25 2125 21 12 450 94 76 1.24 7.3301 0.17625 0.40491 0.00566 0.13453 0.0018 2153 21 2192 26 2158 23 13 452 118 156 0.75 4.8441 0.08304 0.28008 0.00377 0.12363 0.00144 1793 14 1592 19 2009 20 14 872 189 115 1.65 7.39634 0.13693 0.39855 0.00538 0.13238 0.00154 2161 17 2162 25 2130 20 15 325 60 74 0.82 7.70733 0.15562 0.38722 0.00526 0.13274 0.0016 2198 18 2110 24 2135 21 16 366 71 106 0.67 7.53115 0.14242 0.41168 0.00556 0.13289 0.00156 2177 17 2223 25 2137 20 17 423 80 123 0.65 5.79661 0.1105 0.29586 0.00401 0.13491 0.00164 1946 17 1671 20 2163 21 18 325 61 284 0.21 3.98935 0.06076 0.25093 0.00333 0.11658 0.00129 1632 12 1443 17 1905 20 19 315 60 88 0.68 7.04878 0.13114 0.39017 0.00525 0.13502 0.00159 2118 17 2124 24 2164 20 20 559 109 99 1.10 7.13277 0.14496 0.40243 0.00546 0.13439 0.00165 2128 18 2180 25 2156 21 DD09-1 72 186 122 1.52 0.15074 0.00584 0.02231 0.0004 0.05026 0.0019 143 5 142 3 207 86 2 30 77 74 1.04 0.14841 0.00931 0.02255 0.00054 0.04703 0.00293 141 8 144 3 51 143 3 43 111 97 1.15 0.14748 0.00621 0.02221 0.00042 0.04728 0.00196 140 6 142 3 63 96 4 26 72 54 1.32 0.14452 0.01439 0.02052 0.00079 0.05422 0.00547 137 13 131 5 380 213 5 30 91 55 1.66 0.15012 0.00972 0.02157 0.00056 0.04928 0.0032 142 9 138 4 161 145 6 64 168 88 1.91 0.15022 0.00912 0.02235 0.00052 0.04737 0.00285 142 8 143 3 67 138 7 53 131 91 1.44 0.1697 0.01381 0.02035 0.00065 0.06267 0.00512 159 12 130 4 697 165 8 99 278 163 1.71 0.14874 0.00888 0.02171 0.00049 0.04879 0.00288 141 8 138 3 138 133 9 66 172 116 1.48 0.15162 0.01309 0.02208 0.00067 0.0498 0.00428 143 12 141 4 186 188 10 109 298 157 1.90 0.14694 0.00769 0.02193 0.00045 0.0474 0.00244 139 7 140 3 69 119 11 63 202 105 1.92 0.14598 0.00744 0.02153 0.00045 0.04932 0.00248 138 7 137 3 163 114 12 105 326 163 2.00 0.14377 0.00412 0.02069 0.00032 0.04955 0.00135 136 4 132 2 174 63 13 51 155 93 1.66 0.14699 0.00773 0.02175 0.00046 0.04896 0.00255 139 7 139 3 146 118 14 36 105 65 1.62 0.14864 0.00536 0.02248 0.0004 0.04727 0.00167 141 5 143 3 63 83 15 28 89 66 1.35 0.1495 0.01099 0.0218 0.0006 0.05197 0.00382 142 10 139 4 284 159 16 46 138 69 2.00 0.14841 0.00856 0.02186 0.0005 0.05002 0.00286 141 8 139 3 196 128 17 28 90 74 1.21 0.14982 0.00526 0.02209 0.00038 0.04819 0.00165 142 5 141 2 109 79 18 56 165 119 1.39 0.14633 0.00425 0.02189 0.00035 0.05003 0.00139 139 4 140 2 197 63 19 25 81 66 1.23 0.15233 0.00996 0.02222 0.00056 0.05113 0.00333 144 9 142 4 247 143 20 57 172 100 1.72 0.14889 0.00461 0.02236 0.00036 0.04772 0.00142 141 4 143 2 85 70 21 41 115 65 1.77 0.15132 0.00582 0.0225 0.00041 0.05048 0.0019 143 5 143 3 217 85 22 46 118 80 1.47 0.14952 0.00699 0.02225 0.00044 0.04808 0.00221 142 6 142 3 103 105 23 34 99 74 1.34 0.14947 0.00886 0.02175 0.0005 0.04881 0.00287 141 8 139 3 139 132 24 50 145 125 1.16 0.1472 0.00815 0.02168 0.00047 0.04965 0.00271 139 7 138 3 179 123 25 55 162 116 1.39 0.15003 0.00593 0.0223 0.0004 0.05048 0.00195 142 5 142 3 217 87 
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表 2 大东沟金矿区花岗闪长岩和石英闪长岩主量、微量和稀土元素含量
Table 2 Analytical results of major, trace and rare earth elements from granodiorite and quartz diorite in the Dadonggou gold deposit
元素 DD002
石英闪长岩DD004
石英闪长岩DD006
花岗闪长岩DD007
花岗闪长岩SiO2 58.67 58.7 71.97 72.06 TiO2 0.654 0.639 0.102 0.097 Al2O3 15.95 15.95 14.88 15.25 TFe2O3 6.71 6.74 2.32 2.06 MnO 0.106 0.106 0.067 0.068 MgO 4.88 4.84 0.329 0.294 CaO 5.78 5.8 3.71 3.24 Na2O 3.24 3.21 0.59 0.57 K2O 2.9 2.91 4.38 4.17 P2O5 0.233 0.222 0.029 0.033 烧失量 0.47 0.47 1.19 1.73 总计 99.06 99.07 99.39 99.43 FeO 5.33 5.22 1.79 1.43 Na2O+K2O 6.14 6.12 4.97 4.74 K2O/Na2O 0.9 0.91 7.42 7.32 Mg# 58.51 58.74 18.04 18.51 A/NK 1.88 1.89 2.6 2.79 A/CNK 0.84 0.84 1.19 1.34 σ43 2.35 2.33 0.85 0.77 Li 24.8 30.1 12.4 13.9 Be 2.02 2.02 1.24 1.28 Sc 16.4 15.8 1.08 1.07 V 143 141 5.37 5.39 Cr 213 201 5.25 3.35 Co 20.8 20.3 1.1 0.972 Ni 52.2 48.8 2.16 1.76 Cu 20.5 24.3 6.25 6.03 Zn 77.9 75.1 32.3 33 Ga 20.5 19.6 16.6 16.3 Rb 99.9 103 125 119 Sr 612 587 104 142 Zr 17.5 16 52.9 50.9 Nb 9.24 9.28 3.52 3.36 Cs 6.12 5.71 3.28 3.79 Ba 865 830 1241 1302 Hf 1.05 0.945 2.2 2.19 Ta 0.699 0.704 0.353 0.318 Tl 0.591 0.669 0.443 0.402 Pb 20 20.2 13.5 14.5 Th 11 10 3.22 3.73 U 2.08 2.5 2.15 1.69 La 40.4 39.2 2.6 2.45 Ce 74 72.9 4.69 4.33 Pr 8.45 8.25 0.566 0.522 Nd 32.7 31.7 2.31 2.07 Sm 5.81 5.79 0.514 0.483 Eu 1.57 1.55 0.36 0.378 Gd 5.13 5.05 0.645 0.622 Tb 0.82 0.825 0.154 0.142 Dy 4.16 4.23 1.08 0.964 Ho 0.801 0.808 0.246 0.213 Er 2.2 2.18 0.733 0.649 Tm 0.365 0.368 0.128 0.115 Yb 2.29 2.32 0.819 0.76 Lu 0.308 0.331 0.113 0.111 Y 20.8 20.4 6.41 5.84 ΣREE 179 175.5 14.96 13.81 LREE/HREE 10.14 9.89 2.82 2.86 (La/Yb)N 12.65 12.12 2.28 2.31 δEu 0.88 0.88 1.91 2.11 δCe 0.98 0.99 0.95 0.94 Nb/Ta 13.22 13.18 9.97 10.57 Rb/Sr 0.16 0.18 1.2 0.84 注：Mg#=[100Mg/(Mg+TFe)]；A/NK=[Al2O3/(Na2O+K2O)](mol)；A/CNK=[Al2O3/(CaO+Na2O+K2O)](mol)；σ43=(Na2O+K2O)2/ (SiO2-43)；主量元素含量单位为%，微量和稀土元素含量单位为10-6
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