摘要
柴达木盆地西北地区花状断褶构造和后生表褶构造分布普遍 ,断裂活动具明显的剪切挤压性质。根据柴西北地区白垩纪—第四纪的沉积特征 ,结合区域构造应力场研究成果 ,将构造演化划分为 4个阶段 ,即早白垩世中期—古新世的拗陷阶段、始新世—渐新世的引张 剪切阶段、新近纪—早更新世的强烈挤压 剪切阶段和中更新世以来构造活动相对稳定阶段。柴西北地区的构造演化受周缘山系构造活动的严格控制 ,中新世是断裂活动和构造裂缝形成的重要时期。图 7表 1参
Faulting and other tectonic activities in the Northwest Qaidam Basin are widespread and characterized by shearing and compression. Based on depositional history and regional stress analysis, the Cretaceous-Quaternary tectonic history is subdivided into four phases: ① Subsidence from the middle part of the Early Cretaceous to the Paleocene; ② Extension and shearing in the Eocene-Oligocene; ③ Intensive compression and shearing from Miocene to early Pleistocene; and ④ Relative quiescence since the middle Pleistocene. Miocene was a period of intensive faulting and fracturing, apparently affected by surrounding orogenic activities.
出处
《石油勘探与开发》
SCIE
EI
CAS
CSCD
北大核心
2004年第2期46-49,共4页
Petroleum Exploration and Development
