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红丝石是产于山东临朐中奥陶统下部的一类具红色丝线状弯曲纹层的用于加工工艺品(砚台、笔筒等)的微晶碳酸盐岩。产有红丝石的这部分地层,厚约60m,被称为“红丝石层”。根据野外观测、室内鉴定及地震地质对比,从临朐红丝石层中识别出了具卷曲变形(包括塑性和半塑性变形)、环形纹层变形、微断裂(包括阶梯状和共轭微断裂)、震裂隙和震碎角砾等地震成因岩石构造的震积岩层。这些震积岩是中奥陶世古地震事件的记录,红丝石仅是古地震作用形成的一种常见的震积岩,由于在中奥陶世郯庐带内也有震积岩生成,因此认为这些地震记录是古郯庐带在中奥陶世强烈活动的证据。
Red silk is produced in Linqu, Shandong Ordovician in the lower part of a class of red filamentous curved layer for processing crafts (ink stone, pen holder, etc.) of the microcrystalline carbonate rock. Produced with red silk stone in this part of the formation, about 60m thick, known as the “red silk layer.” According to the field observation, indoor identification and seismic geology comparison, three types of deformations, including curly deformation (including plasticity and semi-plastic deformation), annular deformation, micro-faults (including staircase and conjugate micro-faults) , Seismic fissures and crushed breccias and other seismic genetic rock structure of the seismite rock. These seismites are records of the Middle Ordovician paleoclimate event, which is only a common seismites formed by paleoearthquakes. Because of the generation of seismites in the Middle Ordovician Tanlu zone, it is considered that these seismosols Records are evidence of the ancient Cululu belt’s strong activity in the Middle Ordovician.