甘肃龙首山成矿带芨岭地区断裂构造解析及变形序列

Fault Structural Analysis and Deformation Sequence of Jiling Area in the Longshoushan Metallogenic Belt, Gansu

龙首山成矿带芨岭地区以发育钠交代热液型铀矿床而备受瞩目,区内断裂构造控矿特征明显。通过大比例尺构造剖面和钻探查证,对芨岭地区断裂构造要素进行了详细分析;依据其相互截切关系及构造组合特征,识别出4期断裂构造变形,建立了龙首山成矿带芨岭地区的断裂构造相对变形序列;结合区域地质演化资料,进一步厘定了4期断裂构造变形时限,为钠交代热液型铀矿地质找矿工作提供了新的构造依据。

Sodium metasomatic hydrothermal uranium deposit was well-developed in Jiling area,which are mainly controlled by fault structure.By means of large scale structural section and drilling,the authors discussed geometry,kinematics featcres of faults and their intersecting and combination relation.Accordingly,a 4-phase deformation was recognized,and the relative fault structure deformation sequence in Jiling area was established.Combining with regional geological evolution data,the authors further defined the time limit of four phase deformation,and the results provide new evidence for the study of sodium metasomatic hydrothermal uranium deposits.