准噶尔盆地南缘新生代地层时代研究AGES OF THE CENOZOIC STRATA ON THE SOUTHERN MARGIN OF JUNGGAR BASIN,NORTHWESTERN CHINA
季军良,朱敏,王旭,罗攀,董欣欣
摘要(Abstract)：
对准噶尔盆地南缘金沟河剖面进行了磁性地层学研究,建立了该剖面精细的磁极性年代框架,并探讨了准噶尔盆地南缘新生代地层的年代。金沟河剖面出露的新生代地层厚约4160m,由老到新依次为安集海河组、沙湾组、塔西河组、独山子组和西域组。通过系统热退磁和剩磁测量,1285块样品获得特征剩磁,并由此建立该剖面自出露的安集海河组底部至西域组中部厚约3250m地层的磁极性柱。根据该剖面极性柱的变化特征和剖面中发现的两处脊椎动物化石,与2004年标准磁极性柱进行了对比。结果表明,金沟河剖面研究段地层的年代约为28.0—4.0Ma,其中安集海河组、沙湾组、塔西河组和独山子组的年代分别约为28.0—23.3Ma、23.3—17.5Ma、17.5—13.2Ma和13.2—6.0Ma,根据沉积速率外推得到的西域组的年代约为6.0—1.1Ma。与前人划分的准噶尔盆地南缘新生代地层的年代相比较,金沟河剖面磁性地层学确定的安集海河组、沙湾组和塔西河组的年代与前人的划分基本相符,而独山子组和西域组的年代则明显偏老。
关键词(KeyWords)： 磁性地层学;新生代;天山;准噶尔盆地;新疆
基金项目(Foundation): 国家自然科学基金(No.40902049,40730208)资助
作者(Author): 季军良,朱敏,王旭,罗攀,董欣欣
DOI: 10.19839/j.cnki.dcxzz.2010.01.008
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