地质与勘探2024，Vol.60Issue(6)：1196-1204,9.DOI:10.12134/j.dzykt.2024.06.009
西秦岭徽成中一新生代红层盆地陇成段航磁构造成因探讨
Huicheng Mesozoic-Cenozoic Red-Bed Basin in West Qinling Mountains Inferred from Aeromagnetic Measurements
摘要
Abstract
The Huicheng Basin in West Qinling Mountains contains a set of Mesozoic Cenozoic terrestrial red sandstone layers.This basin spans the central part of the Qinling Orogenic Belt,and has a unique location and complex structures.This work focused on high-precision aeromagnetic data from the Wenxian-Chengxian area in this basin,and combined with regional geological and geophysical properties,to study the structural and evolutionary characteristics of the southwestern section of the Huicheng red-bed basin(west of Chengxian County).The aeromagnetic data reveals the magnetic basement of the basin,and clearly illuminates the structural framework of the basin and its periphery.The wide and gentle strong magnetic anomaly that is basically consistent with the outline of the residual red-bed basin was caused by the uplift of the underlying Proterozoic strong magnetic metamorphic bedrock in the basin,and the magnetic metamorphic basement gradually became shallower towards Chengxian County.The major fault structures include the Mianlue suture tectonic zone(Wenkang section),broom-like Fengtai fault zone(Zhouqu-Chengxian),and the in-between Bailongjiang strike slip fault,as well as the superimposed NE-trending secondary fault.These faults reveal that the basin has experienced two periods of basin-mountain coupling dominated by alternate pull apart extension and compression strike slip transformation in the Early Cretaceous and Neogene.And the Gamma spectrum variation characteristics of different red-bed units indicate that the provenance of the Donghe Group and Gansu Group may come from the Yanshan-Indosinian intermediate-acidic rock masses and Paleozoic strata on the south and north sides of the basin,respectively.The research results on the formation and evolution of red-bed basins have important reference value for the geological and structural evolution of the entire Qinling Orogenic Belt.关键词
航空磁测/红层盆地/构造演化/中-新生界/徽县-成县/秦岭造山带Key words
aeromagnetic survey/red-bed basin/tectonic evolution/Mesozoic-Cenozoic/Huixian-Chengxian area/Qinling Orogenic Belt分类
天文与地球科学引用本文复制引用
崔志强,路宁,胥值礼,高卫东,李磊,西永在,郑红闪..西秦岭徽成中一新生代红层盆地陇成段航磁构造成因探讨[J].地质与勘探,2024,60(6):1196-1204,9.基金项目
中国地质调查局地质调查项目(编号:DD20230245)资助. （编号:DD20230245）
