40Ar/39Ar Dating of Muscovite from the Zhelande Au Deposit, Irtysh Tectonic Zone, Xinjiang and Its Geological Implications
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摘要: 哲兰德金矿是额尔齐斯构造带上重要的造山型金矿,产出于韧性剪切带中,金矿化赋存于黄铁矿化闪长岩脉、含金石英脉和黄铁矿化千枚岩中,矿化与韧脆性剪切变形有关。沿剪切面理发育的白云母、绿泥石等新生矿物,为测定金矿形成时代提供了依据。本研究利用白云母40Ar/39Ar年代学手段,确定了韧性剪切带的形成时代和金成矿时代。结果表明白云母坪年龄为295.4±1.6 Ma,韧性剪切变形和金成矿作用发生在295 Ma,略早于多拉纳萨依金矿形成时间。结合前人资料认为,新疆额尔齐斯构造带造山型金矿形成于295~270 Ma。
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关键词:
- 地质特征 /
- 40Ar/39Ar年龄 /
- 造山型金矿 /
- 哲兰德 /
- 额尔齐斯构造带
Abstract:BACKGROUNDThe Zhelande gold deposit is an important orogenic gold deposit in the Irtysh tectonic belt. This deposit is hosted in the ductile shear zone. Mineralization occurs as gold-bearing pyritized diorite veins, gold-bearing quartz veins, and gold-bearing pyritized phyllite. The mineralization is related to the brittle-ductile shear deformation. Muscovite, chlorite and other new minerals occurred in the shear surface. OBJECTIVESTo determine the metallogenic age by 40Ar/39Ar method. METHODSMuscovite 40Ar/39Ar dating was used to constrain the timing of ductile shear deformation and gold mineralization. RESULTSResults show that the plateau age of the muscovite is 295.4±1.6 Ma, suggesting that the ductile shear deformation and gold mineralization occurred at about 295 Ma, slightly earlier than the formation of the Duolanasayi gold deposit. CONCLUSIONSCombined with previous data, the orogenic gold deposits in the Irtysh tectonic belt of Xinjiang possibly formed at 295-270 Ma. -
Key words:
- geological characteristics /
- Ar-Ar age /
- orogenic gold deposit /
- Zhelande /
- Irtysh tectonic zone
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图 1 哲兰德金矿区地质略图[15]
Figure 1.
表 1 哲兰德金矿中白云母40Ar/39Ar阶段升温加热分析
Table 1. Results of 40Ar/39Ar stepwise heating dating for muscovite from the Zhelande Au deposit
ZLD14-2白云母;样品质量(W)=10.68 mg;J=0.003493 T(℃) (40Ar/ 39Ar)m (36Ar/39Ar)m (37Ar/ 39Ar)m (38Ar/39Ar)m 40Ar(%) F 39Ar(×10-14 mol) 39Ar累积(%) 年龄±1σ(Ma) 700 75.1437 0.1149 0.0000 0.0347 54.81 41.1860 0.09 0.53 242.5±5.5 770 63.5889 0.0428 0.0000 0.0210 80.09 50.9296 0.34 2.48 295.4±3.5 820 57.4390 0.0242 0.1561 0.0176 87.55 50.2933 0.57 5.77 292.0±2.8 860 58.9824 0.0260 0.0000 0.0175 86.94 51.2802 0.84 10.58 297.2±2.8 900 55.6024 0.0159 0.0418 0.0155 91.55 50.9075 2.51 24.96 295.3±2.7 930 52.5392 0.0065 0.0962 0.0138 96.35 50.6258 1.33 32.60 293.7±2.7 960 52.8558 0.0067 0.0000 0.0138 96.26 50.8793 2.32 45.90 295.1±2.7 1000 53.8169 0.0096 0.0000 0.0141 94.75 50.9893 1.26 53.14 295.7±2.7 1040 53.6039 0.0086 0.0000 0.0140 95.24 51.0540 1.84 63.67 296.0±2.7 1080 52.2438 0.0041 0.0000 0.0132 97.69 51.0359 3.76 85.24 295.9±2.7 1120 52.2407 0.0036 0.0307 0.0133 97.94 51.1470 1.92 96.26 296.6±2.7 1160 55.5188 0.0166 0.2049 0.0157 91.19 50.6375 0.38 98.46 293.8±3.0 1400 63.0620 0.0388 0.0000 0.0190 81.80 51.5818 0.27 100.00 298.9±3.1 tT=295.3 Ma;tP=295.4±1.6 Ma;ti=296.0±3.0 Ma 注:表中下标m代表质谱测定的同位素比值;F=40Ar*/39Ar,是指放射性成因40Ar和39Ar比值;tT=总气体年龄;tP=坪年龄;ti=反等时线年龄。 -
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