地质学报2013，Vol.87Issue(1)：101-109,9.
陕北盐盆马家沟组五段六亚段沉积期构造分异对成钾凹陷的控制
Tectonic Differentiation of O2m56 Deposition Stage in Salt Basin,Northern Shaanxi, and Its Control over the Formation of Potassium Sags
摘要
Abstract
Based on drilling data of 16 wells and integrated calibration interpretation of seismic data, the characteristic parameters (e. g. velocity) of the 2D seismic profiles with a total length of 5000 km were obtained. Using the variable velocity mapping method, the isopach map of the saliferous strata of the O2m~6_5, which are the main potash rich strata in the Ordovician northern Shaanxi salt basin, was preliminarily worked out, and the tectonic differentiation in this region was also discussed. In the O2m~6_5 stage of Ordovician period, the northern Shaanxi salt basin showed the tectonic pattern of "two depressions and one lifting" , and there were five salt sags with the thicknesses of more than 150 meters in this region. Discovery of the western salt sags and recognition of Donger salt sag which can be divided into two sub-salt sags in east and west are the new progress made in this study, indicating that the salt basin in northern Shaanxi is not a pan-shaped basin but contains several secondary salt sags controlled by relatively active syndepositonal faults. These secondary salt sags will be helpful to accumulation of potassium materials and provide enough accommodation space and structural positions for the large marine potash formation.关键词
陕北盐盆/奥陶纪/O2m56/构造分异/成钾区位Key words
northern Shaanxi salt basin/ Ordovician/ O2m~6_5/ tectonic differentiation/ potassium sags引用本文复制引用
张永生,郑绵平,包洪平,郭庆,于常青,邢恩袁,苏奎,樊馥,龚文强..陕北盐盆马家沟组五段六亚段沉积期构造分异对成钾凹陷的控制[J].地质学报,2013,87(1):101-109,9.基金项目
本文为中国地质调查局地调工作项目(编号1212011085516)、国家重大基础研究计划"973"课题(编号2011CB403001)资助的成果. （编号1212011085516）
