准噶尔盆地东北缘二叠纪地层时代划分

Epoch Division of Permian Strata in Northeast Margin of Junggar Basin

准噶尔盆地东北缘二叠纪地层为陆相沉积，古生物资料贫乏，地层划分方案纷杂，众说不一，部分层段划分证据不足。本文利用磁性地层配合同位素年代学和孢粉学对该区二叠系重新划分，二叠纪沉积期大多数时间处于基亚曼反向极性期，其极性单一，据地磁年表反应的极性特征来对比确定其地层时代界线。

Permian System is poor at paleontologic data on the northeastern margin of the Junggar basin, resulting in it unfavourable to solve problem of oilfield exploration.This paper uses paleomagnetic stratigraphy,isotopic geochronology and sporologic methods to confirm the age of each group in Permian System.It is feasible to use Jiaman revesed epoch or chronology feature to divide the age of Permian System.Paleomagnetic sample density and result of the measurement are in accordance with the demands of paleomagnetic stratigraphy from Pingdiquan Group to Liukeshu Group. In addition, sporopollen analytical substances are limited in Pingdiquan Group, and Pityosporites-Torispora constituents are discovered under sporopollen distinction and contrast. The Ar- and Pb-isotopic methods of organic matter are also applied to sedimentary rock and coal series in dating.