Analysis Of Deposit Structure Of Kawa Ore Field In The Western Sector Of The Northern Qilian

The Kawa iron ore field in the western part of the northern Qilian is an important component of the Cu,Pb,Zn,Fe,Cr,Au,Ag-pyrite-asbestos metallogenic belt in the North Qilian.After the formation of Kawa iron ore is affected by multi-stage tectonic movement,the structure of ore field is very complicated,which greatly hinders the deployment of exploration engineering and effective prospecting exploration.In this paper,the stratigraphic sequence,tectonic framework,ore structure and ore-controlling structure of Kawa iron ore field are systematically studied by constructing geological,geometrical,kinematic and kinetic methods.The following conclusions are given:1.Kawa mining area from bottom to top for the Great Wall Department of Zhu Longguan rock group boil oil ditch group,birch ditch group and Gongcha group five mountain group.The Huguanggou Formation and the overlying birch ditch group were in contact with the fault.Taligangou regional strata from old to new for the birch ditch group,mirror iron mountain group and five mountain group.Ore bodies are present in the birch ditch group.2.Kawa-one fold structure from south to north by the anticline,diagonal,anticline composition,tectonic line direction for the northwest.The ore body on both sides of the control by the reverse fault,the ore body structure is more complex,small traction folds,caused by the process of folding between the layers caused by the two mine as a whole two inclined distribution of the inclined structure,Tectonic line direction northwest.The ore bodies exposed in the Minmetals show a geometrical feature of the fold structure("S" type folds or the expansion and contraction)on the plane,but it is due to the NWW strike-slip fault on both sides of the orebody Resulting in the formation of the axial inclination of the vertical tilt of the vertical fold;Sanmiao main body for a monoclinic structure,the structure line for the near EW to.The fault structures in the area are mainly in the north-east-southwest,northwest-south-east and near-east-west,and the fracture properties are mainly thrust and strike-slip faults.Among them,the thrust-When the distribution of "S" type of vertical folds.The fractured tectonics in the Taligangou iron ore area are divided into two categories: northwest and north east.The fold structure is divided into two categories: near-east-west direction and near-north-south direction.Because the Taligangou mine is surrounded by a rectangular geometric shape by the right strike slip fault(boundary fault),the deformed geologic body in the mining area produces a clockwise rotation during these boundary fracture(non-coaxial progressive deformation),Resulting in this part of the strata,the structure of the distribution direction from NNW-NS to NNE,and in the plan to show the S and anti-S-shaped distortion.