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方解石合成流体包裹体在水岩反应实验中的应用
Application of calcite synthetic fluid inclusion in water-rock reaction experiment
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| DOI | 10.20086/j.cnki.yskw.2025.4161 |
| 刊名 |
Acta Petrologica et Mineralogica
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| 年，卷(期) | 2025, 44(3) |
| 作者 |
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| 作者单位 |
1. 中国地质大学(北京)地球科学与资源学院, 北京 100083; |
| 摘要 |
传统的水岩反应实验中,流体在高温高压条件下发生淋滤反应之后,一些物质很容易在冷却过程中发生二次沉淀或吸附,从而影响实验结果的准确性。人工合成流体包裹体技术能在高温高压条件下对流体进行原位取样,再通过激光剥蚀电感耦合等离子体质谱(LA-ICP-MS)进行成分分析,直接获得高温流体的物质组成,可以有效避免这一问题。本研究模拟兰坪地区盆地卤水(NaCl/NaCl+CaCl2)与基底岩石(三叠纪辉绿岩、二叠系岩屑灰岩和中三叠统凝灰岩)在高温高压条件下(200℃、10 MPa)发生水岩反应的过程,通过方解石人工合成流体包裹体技术,研究水岩反应对流体成分的影响,探讨流体中成矿元素的来源,以及与盆地内密西西比河谷型(Mississippi Valley-type, MVT)铅锌矿床在成因上的关系。显微测温表明,初始流体为3 m NaCl + 0.15 m CaCl2体系的人工合成流体包裹体的冰点温度介于-13.6~-11.4℃之间,初始流体为3 m NaCl体系的合成包裹体的冰点温度介于-11.8~-10.7℃之间,NaCl体系合成包裹体的冰点温度高于NaCl+CaCl2体系的冰点温度,表明人工合成的包裹体流体组分与初始流体组分一致。结合显微测温分析及单个流体包裹体的LA-ICP-MS原位成分分析测试,证实以方解石为寄主矿物合成水岩反应流体包裹体的实验方法在低温流体-岩石相互作用模拟领域具有广阔的应用前景。
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| Abstract |
Traditional water-rock reaction experiments under high temperature high pressure (HTHP) conditions often result in precipitation or adsorption of the products during the subsequent cooling processes. This issue can be overcome by synthetic fluid inclusion, which enables in-situ entrapment of fluid samples under HTHP conditions, and analyses of fluid composition using a LA-ICP-MS. This study simulates the HTHP (200℃ and 10 MPa) water-rock reaction process between basin brine (NaCl/NaCl+CaCl2) and basement rocks (Triassic diabase, lithic limestone, and Middle Triassic tuff) in Lanping Basin, Southwest China, and uses synthesis fluid inclusion in calcite to trap the fluid during reaction. By comparing the fluid composition before and after water rock interactions, we are able to explore the origin of ore-forming metals in the fluids, and their contributions to the formation of the Mississippi Valley-type (MVT) Zn-Pb deposits in the basin. Based on microthermometric analyses, the freezing temperature point of synthetic fluid inclusions trapping a 3 m NaCl + 0.15 m CaCl2 fluid ranged between -13.6 and -11.4℃, while that trapping a 3 m NaCl fluid ranged between -11.8 and -10.7℃, indicating that the fluid composition trapped within these inclusions is consistent with the initial fluids loaded in our experiment. Furthermore, both microthermometric and LA-ICP-MS analyses demonstrated that this synthetic fluid inclusions method using calcite as the host mineral has a nice potential in simulating the relatively low-temperature fluid-rock interactions in nature.
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| 关键词 |
水岩反应；人工合成流体包裹体；方解石；高温高压
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| KeyWord |
fluid-rock reaction; synthetic fluid inclusions; calcite; high temperature-pressure
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| 基金项目 | |
| 页码 | 619-633 |
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