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地质学报  2004 

天山东段晚中生代―新生代隆升沉积响应、年代学与演化研究

, PP. 319-331

Keywords: 天山,隆升,沉积,年代学,演化

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Abstract:

天山晚白垩世―新生代沉积序列中发育K2/K1、N1/E3以及Q2/Q13个重要不整合面,它们作为重要的界面并结合沉积相序组合的发育,共划分出TC-0至TC-7等8个向上变粗、变浅的巨型沉积层序;砂岩碎屑模型分析表明,南、北天山物源构造属性有别,分别来自南北侧再旋回造山带或切割―未切割岩浆弧;砂岩组分和重矿物组合显示渐新世―早中新世间物源区曾发生过明显的改变,耦合于天山造山带沉积-构造演化;造山带内批量磷灰石裂变径迹年龄呈现出频率较高的几个年龄组段,即频率48.84%的24.74Ma、频率27.91%的15.98Ma和频率11.63%的45.22Ma,从而确定了天山初始隆升及其后的几个主要隆升阶段的时限,即白垩纪末期―始新世(65.6~45.22~32.60Ma)的初始隆升以及24.74~15.98Ma、小于6.7Ma大于0.73Ma和小于0.73Ma等至少4个隆升时期;造山带隆升的年龄数据除部分和地层中磨拉石建造发育的年代基本吻合外,大多磨拉石建造年代增新约8~1Ma,反应了天山造山带边缘盆地内沉积层序发育和造山带形成演化间的耦合―滞后关系;天山最初的隆升时限为晚白垩世,渐新世末期北缘较南缘先期发育,同时北缘西段较东段表现强烈,上新世―早更新世时期隆升才向土哈盆地和天山南缘迁移发展。

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