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本文采集了龙门山逆冲推覆构造带内三种不同变形程度的长英质岩石,利用傅里叶红外吸收光谱仪(FITR),测试了包含次生流体包裹体石英和长石内的微量水,并与干净石英样品测试结果进行比较.研究表明,含次生流体包裹体的石英和长石的吸收峰基底宽缓,曲线平滑,主要吸收峰出现在3380~3450cm-1附近,造成次要吸收峰难以识别,吸收强度整体大幅提高,其中3200cm-1、3650cm-1和3730cm-1附近的微弱吸收峰更容易见到.三个样品中含次生流体包裹体的长石的水含量(0.022~0.103wt%H2O)高于石英(0.011~0.031wt%H2O)的水含量,水含量随变形程度的增加先升高后降低.含次生流体包裹体的石英和长石的水含量不能代表矿物内的结构水,但能够反映出微裂隙内流体的多少.因此,这间接指示了震后快速蠕变时期断层带边缘水含量高于中心的流体分布特征.
In this paper, three kinds of felsic rocks with different deformation degrees in the thrust nappe structure zone of Longmenshan were collected. FITR was used to measure the trace amounts of trace water including quartz and feldspar in the secondary fluid inclusions The results show that the absorption peaks of quartz and feldspar with secondary fluid inclusions are broad and smooth with the main absorption peak appearing near 3380 ~ 3450cm-1, resulting in minor The absorption peak is hard to be identified and the absorption intensity is significantly increased as a whole, of which the weak absorption peaks around 3200cm-1, 3650cm-1 and 3730cm-1 are more easily seen. The water content of feldspar with secondary fluid inclusions 0.022-0.103wt% H 2 O) is higher than that of quartz (0.011-0.031wt% H 2 O), the content of water first increases and then decreases with the increase of deformation degree.The water content of quartz and feldspar with secondary fluid inclusions can not Which represents the structural water in the mineral but reflects the amount of fluid in the micro-fractures.Therefore, this indirectly indicates the fluid distribution characteristics of the edge of the fault zone with higher water content than the center during the fast creep.