新疆东部博格达山北侧石炭系碎屑锆石U-Pb定年及其地质意义

被引:21
作者
陈登超 [1 ,2 ]
赵省民 [2 ]
邓坚 [2 ]
机构
[1] 中国石化胜利油田有限公司地质研究院
[2] 中国地质科学院矿产与资源研究所
关键词
准噶尔盆地; 博格达山; 石炭系; 碎屑锆石; LA-ICPMSU-Pb定年;
D O I
暂无
中图分类号
P597.3 [];
学科分类号
摘要
本文应用LA-ICPMS锆石U-Pb定年方法,对博格达山北侧原石炭系沙雷赛尔克组及沙玛尔沙依组开展了碎屑锆石U-Pb年代学研究。测年结果显示沙雷赛尔克组碎屑锆石表面年龄值分布较宽(298~2215Ma),主要集中在298~344Ma,主峰值年龄为305Ma,次要峰值为501~538Ma,并见有一粒1331Ma及两粒2146Ma、2215Ma的碎屑锆石;沙玛尔沙依组碎屑锆石表面年龄分布较窄(280~523Ma)且相对集中(299~358Ma),主峰值年龄为345Ma,次要峰值年龄为428~450Ma及507~523Ma。通过样品岩石学特征、碎屑锆石Th、U含量、CL组构特征及区域地质资料分析,初步获得以下认识:①博格达山北侧原定义为石炭纪地层的沉积时代应为早石炭世—早二叠世,其中奇尔古斯套群时代为早石炭世晚期—晚石炭世早期,居里得能组—扬布拉克组时代为晚石炭世中期及晚期,沙玛尔沙依组时代为早二叠世早期,缪林托凯陶山组沉积时代及其与沙玛尔沙依组的关系尚有待于进一步研究;②沙雷赛尔克组及沙玛尔沙依组砂岩主要来自于准噶尔盆地,主要物质供给区为区内略早于或与其同时代沉积的石炭纪地层;③博格达晚古生代大陆裂谷在早石炭世已形成,晚石炭世开始衰退,并发生两次弱造山作用,中二叠世夏子街期最终闭合。
引用
收藏
页码:1770 / 1780
页数:11
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