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库鲁克塔格地区奥陶系层序地层与海平面变化

, PP. 283-293

Keywords: 层序,奥陶纪,原型盆地,海平面变化,塔里木盆地,库鲁克塔格

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Abstract:

出露于新疆库鲁克塔格地区的奥陶系揭示出一个完整长周期(Ⅰ级周期)的海侵-海退沉积序列。这个沉积序列由9个Ⅲ级层序和3个Ⅱ级层序构成,反映了短周期(Ⅲ和Ⅱ级周期)的海平面变化。下奥陶统是在长周期海侵背景下形成的,为一套主体在次深海环境下形成的层序组合――Ⅱ级层序A;中奥陶统是长周期海平面波动的背景下形成的,为一套主体在次深海-浅海陆棚环境下形成的层序组合――Ⅱ级层序B;上奥陶统是长周期海退背景下形成的,为一套主体在浅海-滨海环境下形成的层序组合――Ⅱ级层序C。库鲁克塔格地区奥陶系层序地层特征及其揭示的海平面变化是盆地形成与转变的构造机制的响应。奥陶纪是早古生代盆地发生盆地类型转化的关键时期,即从寒武纪-早奥陶世的裂陷盆地,经中奥陶世的过渡,转化为晚奥陶世-志留纪的前陆盆地。由于后期的构造变动本区现已成为塔里木盆地东北边缘隆起。

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