从古地磁资料看柴达木盆地古构造环境  

Paleo-structural environment study by paleomagnetic data in Qaidam basin

作　　者：余辉龙[1] 邓宏文 胡勇 

机构地区：[1]中国地质大学 [2]中国石油青海油田勘探开发研究院

出　　处：《石油勘探与开发》2002年第6期41-44,共4页Petroleum Exploration and Development

摘　　要：根据古地磁资料研究柴达木地块与周缘地块的关系 ,分析柴达木盆地中生代以来的构造背景和应力作用特征 ,试图对柴达木盆地重大地质问题给以合理的解释和佐证。根据研究结果 ,认为阿尔金断裂的走滑运动方式由中生代左行走滑转为早第三纪右行走滑 ,再转为晚第三纪左行走滑 ,指出柴达木盆地是中、新生代在不同古应力环境下形成的挤压拗陷型盆地 ,近南北向构造带形成早于北西西向构造带。This paper deals with the background and charcter of paleo structral stress of Qaidam basin by using paleomagnetism of Qaidam and its edging block. Many important questions, such as basin type, sedimentary migration, cause of the formation of the structure along near SN and NWW trend and the history of Aerjin fracture, are interpreted and certified. The movement of Aerjin fracture was from sinistral strike slip during Mesozoic to dextral strike slip during Paleogene and then to sinistral strike slip during Neogene. By relation research between Qaidam and its edging block, the researcher presents that Qaidam basin was compressive downwarping basin under different stress environments in Mesozoic and Cenozoic and near SN structural zone formed earlier than NWW structural zone.

关 键 词：柴达木盆地 阿尔金断裂 古地磁 构造运动 

分 类 号：P631.2[天文地球—地质矿产勘探] TE121[天文地球—地质学]