论文部分内容阅读
澳大利亚东南部的Ballarat板岩带的砂屑岩,有发育完好的分异或间隔劈理,它由层状硅酸盐域与富石英域交替组成(分别称P域和Q域)。据各域的显微构造和化学研究分别得到的应变分析说明,P-Q组构的形成与溶液迁移的平面应变变形有关,这种变形在P域中的主有限缩短是相邻Q域缩短的两倍。P与Q两域中普遍发育的石英-钠长石-绿泥石附生现象说明,有限伸长显著,同构造黄铁矿变斑晶周围发育的压力影的有限伸长在100％以上.这种分析与已知体积恒等变形相符合,因此手标本尺度上物质总量无增减。这些观察符合于在静态流体中通过扩散使溶液迁移大至几厘米,并不需要,但不完全排除,早先研究中提出的劈理形成时有贯穿板岩带的大规模对流式流体迁移。
Sandstone rocks in the Ballarat slate belt in southeastern Australia have well-developed segregation or interval cleavage consisting of alternating layered phyllosilicate and quartz-rich domains (P and Q domains, respectively). Strain analysis obtained from the microstructures and chemical studies in each domain shows that the formation of the PQ structure is related to the plane strain deformation of solution migration. The main shortening of this deformation in the P domain is the shortening of the adjacent Q domain by two Times The quartz-albite-chlorite epiphyroidism commonly developed in both P and Q fields shows that the finite extension is significant, and the limited extension of the pressure shadow developed around the zonation of the same-structure pyrite is above 100%. The species analysis is consistent with the known volume-invariant deformations, so there is no increase or decrease in the total mass of the material on the handsheet. These observations are consistent with the fact that migration of solutions up to a few centimeters by diffusion in static fluids is not required, but not completely excluded, and the large-scale convective fluid migration through the slate zone occurs during cleavage as proposed in earlier studies.