Geochronology and isotopic geochemistry characteristics of the Maoling large gold deposit, Liaoning Province, China
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摘要:
猫岭矿床是华北克拉通北缘重要的含砷浸染型金矿之一，赋存于元古代辽河群变质岩中。矿体以脉状、似层状、透镜状等产出，受NE向和NW向韧性剪切带及次级断裂控制。选取猫岭矿床10件硫化物样品开展了Rb-Sr定年，获得Rb-Sr等时线年龄为2287±95Ma（MSWD=1.9），初始Sr同位素比值ISr=0.7117，显示成矿作用发生于古元古代早期。矿区内卧龙泉和猫岭岩体的LA-ICP-MS锆石U-Pb年龄分别为183.0±1.8Ma、128.8±1.6Ma，表明晚中生代岩浆活动与猫岭金矿化无成因联系。成矿流体的δ18OW值为6.3‰~9.7‰，δDW值为-97.2‰~-82.6‰，表明成矿流体主要来源于岩浆热液，混合部分大气降水。金属硫化物的δ34S值为+4.3‰~+10.5‰，平均值为+7.9‰，与辽河群盖县组的硫同位素组成相似，表明硫源区为古元古代盖县组。猫岭矿床形成于古元古代伸展构造背景，与辽河群早期的同构造岩浆-热液活动有关，同期形成的强硅化圈保护金矿体免受后期地质作用的破坏。
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关键词:
- 锆石U-Pb定年 /
- 硫化物Rb-Sr定年 /
- 同位素地球化学 /
- 猫岭金矿 /
- 辽东半岛
Abstract:The Maoling large gold deposit, located in northern North China Craton, is an As-bearing disseminated gold deposit. The ore bodies are hosted in the metamorphic rocks of the Proterozoic Liaohe Group. The gold orebodies appear as veins, bedded, and lenticular, and controlled by NE-and NW-striking ductile shear belts and secondary faults. We present Rb-Sr ages from ten metallic sulfide samples which reveal the mineralization timing of the Maoling gold deposit as 2287±95Ma (MSWD=1.9), initial Sr isotopic value ISr=0.7117. The high precision LA-ICP-MS zircon U-Pb dating method has been applied to measure the ages of the Wolongquan and Maoling granitic intrusions in the Maoling deposit, corresponding the dated ages of 183.0±1.8Ma, 128.8±1.6Ma, respectively. The Late Mesozoic magmatic activities were not related to the formation of the Maoling deposit. The calculated δ18O water values of ore-forming fluids show a range of 6.3‰ to 9.7‰. The δD values range of -97.2‰ to -82.6‰. H-O isotopic data indicate the ore-forming fluids were mainly derived from magmatic fluid with minor metoric water. The δ34S values recorded in the sulfide minerals from the Maoling deposit show a range of +4.3‰ to +10.5‰, averaging +7.9‰, similar to sulfur isotopic composition of the Gaixian Formaiton of the Liaohe Group. This evidence shows sulfur derived from strata of the Gaixian Formation. The Maoling gold deposit was formed in Paleoproterozoic extensional setting. The gold mineralization could be related to syntectonic magmatic hydrothermal activities in the early formation process of the Liaohe Group, and was not destroyed by later geological activitions as protection of contemporaneous strong silicfication belt.
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Key words:
- zircon U-Pb dating /
- sulfide Rb-Sr dating /
- isotopic chemistry /
- Maoling deposit /
- Liaodong Peninsula
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表 1 猫岭矿床卧龙泉岩体和猫岭岩体LA-ICP-MS锆石U-Th-Pb分析结果
Table 1. LA-ICP-MS zircon U-Th-Pb data of the Wolongquan and Maoling intrusions from the Maoling deposit
样品号 含量/10–6 同位素比值 Th/U 年龄/Ma Pb Th U 207Pb/206Pb 1σ 207Pb/235U 1σ 206Pb/238U 1σ 206Pb/238U 1σ 卧龙泉岩体 LM-122.01 168 713 5090 0.0504 0.00103 0.1983 0.0038 0.02851 0.0003 0.1 181.2 1.9 LM-122.02 143 709 4462 0.05112 0.00064 0.202 0.0027 0.0286 0.00031 0.2 181.8 1.9 LM-122.03 70 488 2205 0.04992 0.00079 0.197 0.0029 0.02864 0.0003 0.2 182 1.9 LM-122.04 51 231 1609 0.05283 0.00096 0.2091 0.0039 0.02864 0.00026 0.1 182 1.6 LM-122.05 116 776 3585 0.05073 0.0008 0.2002 0.004 0.02864 0.0005 0.2 182.1 3.1 LM-122.06 119 1077 3483 0.05096 0.00115 0.2015 0.0048 0.02865 0.00032 0.3 182.1 2.0 LM-122.07 65 373 2072 0.04976 0.0007 0.1971 0.0027 0.02871 0.00026 0.2 182.4 1.6 LM-122.08 40 158 1121 0.05488 0.00177 0.2192 0.0073 0.02878 0.00036 0.1 182.9 2.3 LM-122.09 119 557 3478 0.0565 0.00128 0.2241 0.0051 0.02883 0.0003 0.2 183.2 1.9 LM-122.10 48 955 1218 0.05624 0.0018 0.2251 0.0072 0.02887 0.00033 0.8 183.5 2.1 LM-122.11 160 1271 4533 0.0533 0.00112 0.2125 0.0037 0.02888 0.00029 0.3 183.5 1.8 LM-122.12 85 460 2843 0.05639 0.00148 0.2236 0.0075 0.02891 0.00096 0.2 183.7 6.0 LM-122.13 109 373 3168 0.05823 0.0014 0.2325 0.0046 0.02893 0.00035 0.1 183.8 2.2 LM-122.14 43 182 1378 0.05502 0.00127 0.2193 0.0048 0.02899 0.00041 0.1 184.2 2.6 LM-122.15 212 733 6450 0.05835 0.00087 0.2346 0.0042 0.02906 0.00029 0.1 184.6 1.8 LM-122.16 65 236 1972 0.05665 0.00122 0.2282 0.0051 0.02915 0.00028 0.1 185.2 1.7 猫岭岩体 LM-119.01 10 377 382 0.05065 0.00261 0.1383 0.0069 0.0199 0.00044 1.0 127.0 2.8 LM-119.02 5 153 199 0.04875 0.004 0.1337 0.0099 0.01993 0.00082 0.8 127.2 5.2 LM-119.03 7 181 255 0.04903 0.00199 0.1346 0.0055 0.01993 0.00032 0.7 127.2 2.0 LM-119.04 6 185 223 0.05034 0.003 0.1388 0.0086 0.02 0.0005 0.8 127.7 3.2 LM-119.05 11 342 444 0.0482 0.0019 0.1326 0.0048 0.02013 0.0004 0.8 128.5 2.5 LM-119.06 8 270 301 0.04901 0.00165 0.1357 0.0047 0.02023 0.00029 0.9 129.1 1.8 LM-119.07 9 242 291 0.04939 0.00353 0.1383 0.0096 0.0204 0.00054 0.8 130.2 3.4 LM-119.08 7 185 235 0.04931 0.00183 0.1378 0.0051 0.02046 0.00034 0.8 130.6 2.2 LM-119.09 9 279 331 0.04962 0.00186 0.1385 0.005 0.02047 0.00041 0.8 130.7 2.6 LM-119.10 27 420 546 0.05216 0.00234 0.2732 0.011 0.03824 0.00143 0.8 241.9 8.9 LM-119.11 8 117 141 0.04956 0.00364 0.2689 0.0213 0.03941 0.00134 0.8 249.2 8.3 LM-119.12 689 1069 1678 0.1205 0.0012 5.0004 0.0898 0.30131 0.0053 0.6 1697.8 26.2 LM-119.13 571 744 1434 0.1173 0.0018 4.9207 0.0989 0.30301 0.00477 0.5 1706.2 23.6 
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表 2 猫岭矿床金属硫化物Rb-Sr同位素分析结果
Table 2. Rb-Sr isotopic analyses of metallic sulfides from the Maoling deposit
序号 样号 样品描述 分析矿物 Rb/10–6 Sr/10–6 87Rb/86Sr 87Sr/86Sr(2σ) 1 LM-11 石英-毒砂±磁黄铁矿脉 毒砂 0.3243 2.117 0.4508 0.725791±0.000009 2 LM-12 石英-毒砂±磁黄铁矿脉 毒砂 0.2506 1.439 0.5136 0.734573±0.000012 3 LM-12 石英-毒砂±磁黄铁矿脉 磁黄铁矿 0.6938 0.3416 5.981 0.909864±0.000010 4 LM-13 石英-毒砂±磁黄铁矿脉 毒砂 0.1235 7.408 0.0492 0.711808±0.000008 5 LM-14 石英-毒砂±磁黄铁矿脉 毒砂 0.0839 1.973 0.1247 0.714946±0.000009 6 LM-18 石英-毒砂±磁黄铁矿脉 毒砂 0.1407 0.4209 0.9834 0.742992±0.000007 7 LM-19 石英-毒砂±磁黄铁矿脉 毒砂 0.1531 0.4108 1.105 0.752298±0.000013 8 LM-20 石英-毒砂±磁黄铁矿脉 磁黄铁矿 0.7345 0.5931 3.654 0.832743±0.000009 9 LM-21 石英-毒砂±磁黄铁矿脉 毒砂 0.3821 0.5696 1.982 0.775928±0.000008 10 LM-22 石英-毒砂±磁黄铁矿脉 毒砂 0.3509 0.6188 1.675 0.761271±0.000016
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表 3 猫岭矿床氢、氧同位素分析结果
Table 3. Hydrogen and oxygen isotope compositions of the Maoling deposit
样号 成矿阶段 样品描述 测试矿物 δD/‰ δ18Oquartz/‰ δ18Owater/‰ T/℃ LM-2 Ⅰ 石英-毒砂±磁黄铁矿脉 石英 -87.7 15.2 8.6 308 LM-3 Ⅰ 石英-毒砂±磁黄铁矿脉 石英 -89.2 16.1 9.5 308 LM-4 Ⅰ 石英-毒砂±磁黄铁矿脉 石英 -82.6 16.3 9.7 308 LM-1 Ⅱ 石英-磁黄铁矿±毒砂脉 石英 -86.0 14.9 7.2 279 LM-5 Ⅱ 石英-磁黄铁矿±毒砂脉 石英 -89.5 14.7 7.0 279 LM-6 Ⅱ 石英-磁黄铁矿±毒砂脉 石英 -83.6 15.2 7.5 279 LM-7 Ⅱ 石英-磁黄铁矿±毒砂脉 石英 -97.2 14.0 6.3 279 LM-10 Ⅱ 石英-磁黄铁矿±毒砂脉 石英 -82.7 15.0 7.3 279 注：流体包裹体完全均一温度(T)数据据参考文献[11]
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表 4 猫岭矿床金属硫化物硫同位素分析结果
Table 4. Sulfur isotopic compositions of metallic sulfides from the Maoling deposit
序号 样号 成矿阶段 测试矿物 δ34S/‰ 数据来源 序号 样号 成矿阶段 测试矿物 δ34S/‰ 数据来源 1 LM-11 Ⅱ 磁黄铁矿 5.5 本文 22 L9* Ⅰ 毒砂 4.3 [11] 2 LM-13 Ⅱ 磁黄铁矿 5.0 本文 23 L8-1* Ⅰ 毒砂 6.8 [11] 3 LM-18 Ⅱ 磁黄铁矿 6.5 本文 24 L8* Ⅰ 毒砂 8.1 [11] 4 LM-20 Ⅰ 毒砂 8.5 本文 25 L8-2* Ⅰ 毒砂 9.1 [11] 5 LM-21 Ⅱ 磁黄铁矿 6.1 本文 26 L9-1* Ⅱ 毒砂 9.2 [11] 6 LM-22 Ⅱ 磁黄铁矿 6.1 本文 27 L14-2* Ⅰ 毒砂 9.0 [11] 7 LM-101 Ⅰ 毒砂 9.7 本文 28 L5* Ⅱ 方铅矿 6.4 [11] 8 LM-103 Ⅰ 毒砂 9.3 本文 29 L5-1* Ⅱ 黄铁矿 10.0 [11] 9 LM-104 Ⅰ 磁黄铁矿 6.8 本文 30 3LH3208* Ⅰ 毒砂 8.9 [11] 10 LM-107 Ⅰ 毒砂 9.2 本文 31 MSP94* Ⅰ 毒砂 9.9 [11] 11 LM-110 Ⅰ 毒砂 10.1 本文 32 3LH3216* Ⅰ 毒砂 9.1 [11] 12 LM-112 Ⅰ 磁黄铁矿 7.6 本文 33 3LH3227* Ⅰ 毒砂 9.7 [11] 13 LM-113 Ⅰ 磁黄铁矿 7.5 本文 34 MSP48* Ⅰ 磁黄铁矿 7.4 [11] 14 LM-114 Ⅱ 磁黄铁矿 7.3 本文 35 MSP68* Ⅰ 磁黄铁矿 7.2 [11] 15 LM-115 Ⅱ 磁黄铁矿 7.2 本文 36 MSZHC* Ⅱ 毒砂 7.4 [11] 16 LM-116 Ⅱ 磁黄铁矿 6.8 本文 37 MSZHD* Ⅱ 毒砂 9.0 [11] 17 L30 Ⅰ 毒砂 5.2 [11] 38 MND* Ⅰ 毒砂 10.2 [11] 18 L31 Ⅰ 毒砂 7.4 [11] 39 MNQD* Ⅰ 毒砂 9.8 [11] 19 L32* Ⅱ 毒砂 4.6 [11] 40 MNZHC* Ⅰ 磁黄铁矿 7.3 [11] 20 L33* Ⅰ 毒砂 10.5 [11] 41 MSCH* Ⅱ 磁黄铁矿 7.5 [11] 21 L14-1* Ⅰ 毒砂 8.7 [11] 42 MNZHD* Ⅱ 磁黄铁矿 8.3 [11]
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