Rb-Sr ISOCHRON AGE OF FLUID INCLUSIONS IN THE QUARTZ OF XUJIACUN GOLD DEPOSIT, HEILONGJIANG PROVINCE
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摘要:
徐家村金矿床位于佳木斯地块西南部，矿体赋存于晚二叠世二长花岗岩中.通过对含金石英脉石英中的流体包裹体进行Rb-Sr同位素年龄及H、O同位素测定，获取成矿年龄，探讨成矿流体来源及其与赋矿花岗岩的成因联系.结果显示：石英流体包裹体Rb-Sr等时线年龄为229±8.6 Ma，比含矿岩体形成时代（254.2±0.95 Ma、230.44±0.54 Ma）稍晚或接近.石英中H、O同位素特征显示成矿流体应为晚二叠世花岗岩浆分异出的热液，后期有少量的大气降水的加入，暗示了含矿石英脉与赋矿花岗岩体具有密切的成因联系.综合认为，成岩成矿可能发生在同一地质事件中，即与古亚洲洋板块向佳蒙地块俯冲作用有关.
Abstract:The Xujiacun gold deposit is located in the southwest of Jiamusi block, with the orebody occurred in the Late Permian monzogranite. The metallogenic age is obtained and the ore-forming fluid source and its genetic relation with the host granite are discussed through the determination of Rb-Sr isotope age and H and O isotopes of fluid inclusions in the quartz of gold veins. The results show that the Rb-Sr isochron age is 229±8.6 Ma, slightly later or close to the formation time of ore-bearing rock mass (254.2±0.95 Ma, 230.44±0.54 Ma). The H and O isotopic characteristics of quartz indicate that the ore-forming fluid was the hydrothermal solution differentiated from the Late Permian granitic magma, with a small amount of atmospheric precipitation added later, suggesting that there is a close genetic relation between the ore-bearing quartz vein and the host granite. From the above, it is believed that the diagenesis and mineralization may occur in the same geological event, both related to the subduction of Paleo-Asian Ocean Plate into the Jiamusi-Mongolia block.
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Key words:
- fluid inclusion /
- Rb-Sr isochron /
- H and O isotopes /
- Heilongjiang Province
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表 1 徐家村金矿床石英Rb-Sr同位素分析结果
Table 1. Rb-Sr isotope analysis results of the quartz in Xujiacun gold deposit
样品号 样品名称 Rb/10-6 Sr/10-6 (87Rb/86Sr)N (87Rb/86Sr)N 2ó NL1-2 石英 5.05 75.3 0.1939 0.709658 0.000013 NL1-3 石英 1.33 26.1 0.1478 0.7109469 0.000012 NL1-4 石英 9.45 17.9 1.5297 0.714076 0.000012 NL1-5 石英 5.42 11.1 1.4069 0.713663 0.00001 
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表 2 徐家村金矿石英中氢、氧同位素组成
Table 2. compositions of H and O isotopes in the quartz o XUNJiacun gold deposit
样品原号 矿物 δ18OV-PDB δ18OV-SMOW δ18OH2O δDV-SMOW 均一温度℃ NLl-1 石英 -17.8 12.6 1.89 -82.8 216.3 NLl-2 石英 -16.7 13.7 4.11 -87.1 237 NLl-3 石英 -16.2 14.2 5.63 -85.6 258.3 NLl-4 石英 -16.4 14 4 -83.1 229 NLl-5 石英 -16.3 14.1 2.96 -85.9 209 表中均一温度为对应石英样品中流体包裹体均一温度的平均值（数据未发表）.包裹体测试由核工业北京地质研究所完成，测试仪器为LINKAM THMS600型冷热台，温度控制精度为±0.1 ℃.含量单位：%.
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