论文部分内容阅读
本文提出锡铁山矿区早期属伸展构造体制,形成加里东期变质核杂岩;晚期属收缩构造体制,形成海西期褶皱冲断岩片。认为基底剥离断层(F1)与上剥离断层(F2)所夹绿色变质岩系(O3tna -b)属绿片岩相顺层正滑韧性剪切带,带内基性 -中酸性火山岩所夹灰岩层经变形分解作用形成大理岩构造透镜体群,并在递进变形过程中经水力压裂作用在其中形成系列雁行排布的Y或R型张裂构造,而原先赋存于海相火山岩中由喷流沉积作用形成的层控铅锌矿体则完全从高应变带内迁出,继而沉淀于低应变的透镜化大理岩中及其附近的新生容矿空间中。重点阐述了大理岩透镜体的几何特征,并依此提出预测隐伏铅锌矿体的地质依据
In this paper, the early extensional tectonic system in the Xishan coal mine is proposed to form the Caledonian metamorphic core complex. In the late stage, a shrinkage tectonic system was formed to form Hercynian fold-thrust rock fragments. It is concluded that the green metamorphic strata of green metamorphic rocks (O3tna-b) between the basement detachment fault (F1) and the upper detachment fault (F2) Deformation and decomposition of the formation of marble structure lens body group, and in the progressive deformation process by hydraulic fracturing in which a series of geese arranged Y or R-type fracture structure, and originally hosted in marine volcanic rocks by the spray The Pb-Zn orebodies formed by flow sedimentation completely migrated from the high-strain zone and then deposited in the low-strain and lenticular marble near the newly formed ore-hosting space. The geometrical characteristics of the marble body are elaborated, and the geological basis of the prediction of the buried lead-zinc ore body is proposed