Validation and representation of fluid inclusion microthermometric data using the fluid inclusion assemblage (FIA) concept.
Validation and representation of fluid inclusion microthermometric data using the fluid inclusion assemblage (FIA) concept.
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发表时间：
2008
影响因子：
1.8
通讯作者：
Chi-hao Guo;Lu Huan
中科院分区：
文献类型：
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作者：
Chi-hao Guo;Lu Huan
本文讨论了流体包裹体组合（FIA）方法的原理及其在流体包裹体测温数据验证和表示中的应用。FIA是一组同时被包裹的流体包裹体，FIA内流体包裹体的同时性是基于岩相关系，而不是基于它们在测温属性上的相似性。如果可以根据 岩相学，则 FIA 内的流体包裹体的显微测温数据的一致性表明流体包裹体包裹了均质流体，并且自包裹以来未发生显着改变；显微测温数据是有效的，仅应使用 FIA 内的流体包裹体的平均值进行数据编制。反之，如果 FIA 内的流体包裹体显示出可变的显微测温属性，则该包裹体可能 要么以不同的比例截留了两相或多相流体（非均质截留），要么截留后可能发生了显着的改变（例如颈缩或拉伸）；测温数据无效，不应该用于数据编制。在许多情况下，无法确定一组流体包裹体的同时期，因此FIA方法不能严格 然而，即使在这种情况下，FIA概念仍然有用。如果彼此紧密联系的流体包裹体显示出相似的显微测温数据，则这是一个积极的信号，表明包裹体捕获了均匀的流体，并且在捕获后没有发生明显的改变。在数据编制中应使用单个流体包裹体的显微测温数据，但应注意不要将数据收集集中在有限的区域内。 另一方面，晶体中小区域内显微测温数据的巨大变化可能表明异质捕获、捕获后改性或多于一代流体包裹体的叠加。流体包裹体显微测温数据的详细绘图以及与更明确的 FIA 的比较可用于区分这些可能性。
This paper discusses the principles of the fluid inclusion assemblage (FIA) method and its application in validation and representation of fluid inclusion microthermometric data.An FIA is a group of fluid inclusions that were entrapped at the same time, and the contemporaneousness of the fluid inclusions within an FIA is based on petrographic relationships rather than on their similarity in microthermometric attributes.If an FIA can be identified based on petrography,then the consistency of microthermometric data within the FIA indicates that the fluid inclusions entrapped a homogeneous fluid and have not been significantly modified since the entrapment;the microthermometric data are valid,and only the mean value of the fluid inclusions within the FIA should be used for data compilation.Conversely,if fluid inclusions within an FIA show variable microthermometric attributes,then the inclusions may have either entrapped two or more phases of fluids and in variable proportions (heterogeneous trapping) ,or may have been significantly modified after entrapment (e.g.,necking down or stretching);the microthermometric data are invalid,and should not be used in data compilation.In many cases,the contemporaneousness of a group of fluid inclusions cannot be determined,and so the FIA approach cannot be strictly applied.However,the FIA concept is still useful even in such cases.If fluid inclusions closely associated with each other show similar microthermometric data,it is a positive sign that the inclusions have entrapped a homogeneous fluid and have not been significantly altered after entrapment.Microthermometric data of individual fluid inclusions should be used in data compilation, but caution should be paid not to concentrate data collection in a limited area.On the other hand,large variation of microthermometric data within a small area in a crystal may indicate heterogeneous trapping,post-entrapment modification,or superimposition of more than one generation of fluid inclusions.A detailed mapping of fluid inclusion microthermometric data and comparison with better defined FIAs can be used to discriminate these possibilities.