沉积盆地成岩环境下流体包裹体再平衡机制及其判别方法  

Mechanism and Identification of Fluid Inclusion Re-equilibration in Diagenetic Environment of Sedimentary Basins

作　　者：曹梦春 陈勇[1] 刘闯 王淼 王鑫涛 周辰柱 卓勤功 王俊[5] 

机构地区：[1]中国石油大学(华东)地球科学与技术学院,山东青岛266580 [2]国土资源部金矿成矿过程与资源利用重点实验室,济南250013 [3]山东科技大学地球科学与工程学院,山东青岛266590 [4]中国石油勘探开发研究院,北京100083 [5]香港大学地球科学系,中国香港

出　　处：《地质论评》2017年第1期21-34,共14页Geological Review

基　　金：国家自然科学基金资助项目(编号:41172111);中央高校基本科研业务费专项资金资助项目(编号:SD2013211151);国土资源部金矿成矿过程与资源利用重点实验室资助(编号:2013004);山东省高等学校科技计划项目(编号:J15LH05)的成果~~

摘　　要：流体包裹体再平衡是流体包裹体研究中常遇到的现象,如何识别流体包裹体再平衡,以及解释造成再平衡的地质因素是研究者们需要面对的问题。本文总结了流体包裹体再平衡机制,并简要分析了流体包裹体再平衡的影响因素,就流体包裹体岩相学和均一温度特征详细介绍了再平衡流体包裹体识别方法。地壳中不同的P一T演化史会影响流体包裹体的再平衡过程,变形程度较低时,流体包裹体可能是以塑性拉伸变形为主;变形程度较高时,可能发生泄露、爆裂等,造成流体包裹体不可逆变形。地质作用强烈、变化速度较快的地质背景下,主矿物脆性强、解理发育,个体较大、形状不规则、拉长型的流体包裹体容易受改造。再平衡流体包裹体一般存在针形拉伸变化或爆裂现象(如爆裂晕),且同一FIA流体包裹体气液比、相态等变化较为明显,具较高或较低异常均一温度,均一温度变化较大。流体包裹体再平衡的量化模拟和参考标准有待确立,是未来流体包裹体再平衡问题深化研究的重要方向。Re-equilibration is common in fluid inclusions, and it is a key point how to identify the re- equilibration and to explain the geological factors which lead to re-equilibration. This paper summarizes the mechanism of fluid inclusion re-equilibration and the affecting factors of re-equilibration, and introduces how to identify the re-equilibration in terms of petrography and homogenization temperature characteristics. We conclude that different P--T evolution history can affect fluid inclusions re-equilibration. Specifically, when there is a low deformation degree, plastic deformation can be dominant, while deformation degree is high, fluid inclusion may leak and burst, and irreversible deformation can be dominant. A fluid inclusion in brittle mineral with cleavages, suffering intense geologic process and quickly changeable geological background, is more likely to be re- equilibrated. What＇s more, bigger and irregular （especially elongated shape ） inclusions are easy to re-equilibration. Specifically, re-equilibrated inclusions always show needle-shape pattern or decrepitation pattern （such as decrepitation haloes ）, and inclusions of a FIA have different ratio of gas to liquid or phases, with abnormal homogenization temperature. Quantitative simulation and reference standard of fluid inclusion re- equilibration need to be established, which is an important research direction of the future study of fluid inclusions.

关 键 词：流体包裹体 再平衡机制 影响因素 识别特征 地质意义 

分 类 号：P61[天文地球—矿床学]