摘要
通过北秦岭造山带西段凤县地区 1∶ 5万辛家庄、红花铺幅区调填图及前人成果 ,对位于秦岭岩群南北两侧的丹凤岩群和草滩沟群火山岩的岩石类型、岩石化学及地球化学特征进行对比 ,认为二者均属亚碱性岩系之钙性 -钙碱性系列 ;前者为中 -基性岩组合 ,显示了岛弧外侧 -边缘海型的构造背景特征 ;后者为中 -酸性岩组合 ,具弧后盆地拉张裂谷活动背景特征。为探讨北秦岭造山带的地质发展史提供了新的资料。
On the basis of geological survey of the scale of 1∶50000 in Xinjiazhuang and Honghuapu sheet in Fengxian area in the west sect of the north Qinling orogenic belt and of achievement of former reserchers,and of comparison of the rock type , petrochemistry ,geochemistry of the Danfeng Group, Caotangou Group,author thinks that they belong to calc alkali series, Danfeng Group is the combination of intermediate rock basic rock,showing the background of island arc marginal sea; Caotangou Group is the combination of intermediate rock acid rock , showing the background of move of rift valley of basin after island arc It provided the new information for discussion the geological evolution of the north Qinling orogenic belt
出处
《西北地质》
CAS
CSCD
2002年第3期59-66,共8页
Northwestern Geology
