青海锡铁山矿区褶皱构造及其找矿预测

对锡铁山矿区地层进行了地层层序关系分析，建议该区上奥陶统滩间山群划分为５ 个岩性段，自上至下分别为中基性火山碎屑岩段（Ｏ３ ｔｎｅ） 、正常沉积岩段（Ｏ３ｔｎｄ） 、火山碎屑沉积岩段（Ｏ３ｔｎｃ） 、基性和酸性火山岩互层段（Ｏ３ ｔｎｂ） 和紫红色砂岩段（Ｏ３ ｔｎａ） 。锡铁山地区的区域褶皱构造为一复式向斜，呈中央隆起加两个翼部向斜的“Ｗ”型。区内铅锌多金属矿化主要分布于中央隆起两侧的次级向斜内靠近隆起的部位。在锡铁山铅锌矿床的两端与次级向斜核部均有较大的找矿潜力。

FOLD STRUCTURE AND PRODICTION FOR PROSPECTING IN THE XITIESHAN ORE FIELD,QINGHAI

Based on the analysis of the stratigraphic sequence of the Xitieshan ore field,the author suggests that the Tanjianshan Group of upper Ordovian should be divided into five members,i.e.,intermediate-basic pyroclastic rock(O 3tn e),normal sedimentary rock(O 3tn d),volcanic fragmental-sedimentary rock(O 3tn c),interbedded basic and acidic volcanic rock(O 3tn b) and violet sandstone(O 3tn a),and points out that the regional fold structure in the Xitieshan district is a complex syncline.i.e.,there are two secondary syncline in both sides of the complex syncline. The important minerallization such as lead,zinc and polymetals distributes in the secondary synclines and near the central uplift.There is large potential in the geological prospecting along the stretching direction of the Xitieshan Pb Zn ore deposit and in the saddlle of secondary synclines show great potencial for geological prospecting.