蓝田灞源地区构造特征的初步研究

灞源地区现今的构造特征是晚太古宙以来地壳波浪运动的结果。不整合面经历不同程度滑动;太华群具多期变形;大部分主干断裂是韧性断层并多期活动;控矿构造是次级韧性、脆韧性断层。断层与不整合面相交地段是金铅等矿产的成矿有利部位。

A PRELIMINARY STUDY OF STRUCTURAL CHARACTERISTICS OF BAYUAN AREA,LANTIAN

A prelimiary study is carried out on the structural characteristics of Ba-yuan area. All unconformities were deformed to varying degrees. Through the analyses of geometric relations of small-scale structures, the Taihua Group is shown to have been multiply deformed and marked by different fold patterns, such as recumbent, overturned and horizontal normal folds. Zhangjiaping-Bayuan fault, Aidixian-Leng-shuica fault and many ore controlling faults were ductile initially and then progressively transformed to brittle-ductile ones, and eventually complicated by later brittle deformation. It is believed that the present structural features in this district are the consequence of the crust-wave movement since the late Archeozoic. The forming of gold-lead ore is closely related to the repeated motion of secondary ductile and brittle-ductile faults. It is held that gold-lead ore is likely to form in the areas where faults and unconformities intersect.