Sulfides Rb-Sr and zircon U-Pb ages of the Erdaohezi Pb-Zn deposit in the western slope of the Great Xing'an Range and their constraints on tectonic setting
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摘要:
二道河子铅锌矿床位于额尔古纳地块得尔布干成矿带的中段，地处大兴安岭西坡。为有效限制该矿床的成矿时代，对硫化物Rb-Sr年龄和安山玢岩锆石U-Pb年龄开展研究得出：该矿床的内生成矿作用共经历了3个成矿阶段：石英-黄铁矿阶段(Ⅰ)、石英-多金属硫化物阶段(Ⅱ)和石英-方解石-黄铁矿阶段(Ⅲ)，其中石英-多金属硫化物阶段是主要的矿化阶段；Ⅲ号矿带主成矿阶段5件闪锌矿和3件黄铁矿的Rb、Sr含量分别为0.081×10-6~2.632×10-6和0.661×10-6~3.186×10-6，Rb-Sr同位素等时线年龄为140.8±2.3 Ma，(87Sr/86Sr)i值为0.71025~0.71205；与矿体平行、局部切穿矿体的安山玢岩脉的锆石U-Pb年龄为138.8±1.7 Ma。上述结果表明，二道河子矿床为热液脉状铅锌矿床，形成于早白垩世，与次火山岩(安山玢岩)热事件相近。结合前人研究成果，推测成矿与安山质岩浆作用有关，形成于蒙古-鄂霍茨克洋闭合后的伸展环境。
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关键词:
- 硫化物 /
- Rb-Sr同位素定年 /
- 锆石U-Pb同位素定年 /
- 铅锌矿床 /
- 二道河子 /
- 得尔布干成矿带 /
- 大兴安岭
Abstract:The Erdaohezi Zn-Pb deposit is located in the middle segment of the Derbugan metallogenic belt in the Erguna block that is on the western slope of the Great Xing'an Range.Rb-Sr dating for sulfides and U-Pb dating for zircons from the andesitic porphyrite were carried out in order to constrain the mineralization age.Three endogenic mineralization stages have been identified, namely a quartz-pyrite stage(I), a quartz-polymetallic sulfide stage(Ⅱ), and a quartz-calcite-pyrite stage(Ⅲ), of which, the second stage is the main ore-forming stage.The Rb and Sr contents of 5 sphalerites and 3 pyrites formed at the main mineralization stage in the ore belt Ⅲ vary from 0.081×10-6 to 2.632×10-6 and 0.661×10-6 to 3.186×10-6, respectively.Accordingly, Rb-Sr isotopic dating of sulfides yields a well-defined isochron age of 140.8±2.3 Ma, close to the zircon U-Pb age(138.8±1.7 Ma)of the andesitic porphyrite crosscutting or parallel to the ore body.The calculated initial 87Sr/86Sr ratios range from 0.71025 to 0.71205, which is lower than that of the earth's crust, but higher than that of mantle.Combined with the previous studies, we suggest that the Erdaohezi deposit is a hydrothermal-vein deposit and is associated with the andesitic magmatism event(andesitic porphyrite).Additionally, mineralization occurred in an Early Cretaceous extensional setting after the closure of the Mongolia-Okhotsk Ocean.
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Key words:
- sulfide /
- Rb-Sr dating /
- zircon U-Pb dating /
- Pb-Zn deposit /
- Erdaohezi /
- Derbugan metallogenic belt /
- Great Xing'an Range
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图 1 二道河子矿床大地构造位置图(a)和区域地质图(b) (据段明新等, 2014修改)
Figure 1.
表 1 二道河子矿床黄铁矿和闪锌矿Rb-Sr同位素测试结果
Table 1. Rb-Sr isotopic results of pyrite and sphalerite from the Erdaohezi deposit
样品编号 测试矿物 Rb/10-6 Sr/10-6 87Rb/86Sr 计算误差 87Sr/86Sr 计算误差 测试误差 (87Sr/86Sr)i Rb/Sr 730-15-1 闪锌矿 0.4028 1.8180 0.6435 0.01 0.712384 0.00005 0.000008 0.71110 0.222 730-15-2 闪锌矿 0.2975 1.1090 0.7804 0.01 0.713609 0.00005 0.000017 0.71205 0.268 650-4-4 闪锌矿 0.0813 2.3470 0.1026 0.01 0.711196 0.00005 0.000009 0.71099 0.035 610-7-3 闪锌矿 0.3469 1.0160 0.9923 0.01 0.713073 0.00005 0.000008 0.71109 0.341 610-7-4 闪锌矿 0.1972 0.6608 0.8807 0.01 0.712014 0.00005 0.000015 0.71025 0.298 690-4-4 黄铁矿 2.6320 1.9580 3.9840 0.01 0.719006 0.00005 0.000008 0.71103 1.344 650-7-2 黄铁矿 1.8050 3.1860 1.6710 0.01 0.714323 0.00005 0.000009 0.71098 0.567 610-7-3 黄铁矿 1.2730 1.3870 2.7630 0.01 0.716597 0.00005 0.000009 0.71107 0.918 
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表 2 二道河子矿床安山玢岩锆石U-Th-Pb同位素分析结果
Table 2. Zircon U-Th-Pb data for andesitic porphyry from the Erdaoehzi deposit
测点号 元素含量/10-6 Th/U 同位素比值 年龄/Ma Pb Th U 207Pb/206Pb 1σ 207Pb/235U 1σ 206Pb/238U 1σ 207Pb/235U 1σ 206Pb/238U 1σ 1 12.53 575.06 400.44 1.44 0.0498 0.0028 0.1540 0.0087 0.0224 0.0003 145 8 143 2 2 5.84 178.73 218.85 0.82 0.0457 0.0031 0.1377 0.0086 0.0222 0.0004 131 8 142 3 3 7.55 229.84 273.70 0.84 0.0498 0.0029 0.1525 0.0088 0.0224 0.0004 144 8 143 2 4 8.22 263.48 306.59 0.86 0.0499 0.0026 0.1474 0.0078 0.0215 0.0003 140 7 137 2 5 10.24 427.28 363.97 1.17 0.0476 0.0027 0.1377 0.0077 0.0210 0.0003 131 7 134 2 6 14.78 530.14 513.54 1.03 0.0523 0.0024 0.1597 0.0074 0.0222 0.0003 150 6 141 2 7 13.21 395.73 478.80 0.83 0.0488 0.0021 0.1509 0.0066 0.0223 0.0003 143 6 142 2 8 14.14 381.37 536.71 0.71 0.0484 0.0022 0.1463 0.0065 0.0219 0.0003 139 6 140 2 9 3.64 111.63 134.66 0.83 0.0530 0.0046 0.1544 0.0134 0.0213 0.0005 146 12 136 3 10 14.40 443.41 527.98 0.84 0.0495 0.0020 0.1480 0.0059 0.0216 0.0002 140 5 138 2 11 19.20 620.18 719.63 0.86 0.0491 0.0020 0.1437 0.0059 0.0212 0.0003 136 5 135 2 12 8.10 250.25 294.92 0.85 0.0516 0.0038 0.1594 0.0119 0.0226 0.0004 150 10 144 3 13 11.46 200.64 474.36 0.42 0.0531 0.0037 0.1539 0.0111 0.0209 0.0003 145 10 133 2 14 12.86 400.00 477.41 0.84 0.0506 0.0027 0.1499 0.0079 0.0215 0.0003 142 7 137 2 15 6.47 126.59 258.09 0.49 0.0523 0.0033 0.1565 0.0097 0.0219 0.0004 148 8 140 2 16 22.86 809.24 807.70 1.00 0.0501 0.0018 0.1509 0.0055 0.0218 0.0002 143 5 139 2
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表 3 得尔布干成矿带铅锌多金属矿床岩石/矿石年龄
Table 3. The results of isotopic dating for rock/ore samples of the Pb-Zn deposits in the Derbugan metallogenic belt
矿床名称 测试岩石(矿物) 定年方法 年龄 资料来源 得耳布尔 粗面安山岩 LA-ICP-MS锆石U-Pb 167.0±2.0 Ma Xu et al., 2018 岩屑晶屑凝灰岩 LA-ICP-MS锆石U-Pb 164.8±1.6 Ma 闪锌矿 Rb-Sr等时线 141.6±1.9 Ma 赵岩等, 2017 比利亚谷 流纹质火山角砾熔岩 LA-ICP-MS锆石U-Pb 159.2±1.8 Ma 吴涛涛等, 2014 二道河子 岩屑晶屑凝灰岩 SHRIMP锆石U-Pb 164.2±2.3 Ma 李进文等, 2011 岩屑晶屑凝灰岩 LA-ICP-MS锆石U-Pb 161.0±3.1 Ma Yan et al., 2015 硫化物 Rb-Sr等时线 130.5±3.6 Ma Xu et al., 2020 东珺 玄武粗面安山岩 SHRIMP锆石U-Pb 166.0±3.7 Ma 张斌等, 2011 闪锌矿 Rb-Sr等时线 130.2±4.4 Ma 杨郧城等, 2015 甲乌拉 石英斑岩 SHRIMP锆石U-Pb 150.1±1.8 Ma Niu et al., 2017 正长斑岩 SHRIMP锆石U-Pb 148.8±2.2 Ma 二长岩斑岩 SHRIMP锆石U-Pb 145.3±1.9 Ma 花岗斑岩 LA-ICP-MS锆石U-Pb 141.9±0.5 Ma 曹艳华等, 2020 花岗斑岩 LA-ICP-MS锆石U-Pb 146.4±1.6 Ma 杨梅等, 2017 石英二长斑岩 LA-ICP-MS锆石U-Pb 152.2±1.5 Ma 刘桂香等, 2018 白云母 Ar-Ar等时线 131.88±0.83 Ma Niu et al., 2020 硫化物 Rb-Sr等时线 142.7±1.3 Ma 李铁刚等, 2014 查干布拉根 二长花岗斑岩 LA-ICP-MS锆石U-Pb 143±2 Ma Li et al., 2016 绢云母 Ar-Ar等时线 137±3 Ma
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