塔里木盆地早海西期多期次风化壳岩溶洞穴层
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P931.5 P531

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国家“十五”科技攻关项目(编号2001BA605A-03-01)资助的成果。


Multiple Karst Cave Horizons in the Early Hercynian Weathering Crust in the Tarim Basin
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    摘要:

    洞穴层是识别多期次岩溶旋回的标志,是岩溶旋回连接沉积旋回及周期性海平面变化的纽带。本文通过古地貌恢复,将从钻井剖面中识别的洞穴层归位到早石炭世古地貌剖面中,根据洞穴层总是沿稳定古潜水面发育的特点划分对比洞穴层。通过洞穴层的形成条件、充填结构分析,推断洞穴层发育序次、洞穴层与其同时期形成的沉积地层的时空对应关系,并据此对洞穴层进行盆地范围内跨地区对比、总结斜坡及岛屿两种不同的洞穴层发育模式。研究结果表明,在早海西期,塔北、塔中、和田古隆起中、下奥陶统碳酸盐岩陆块内部发育了3个期次的风化壳岩溶洞穴层,其序次为下老上新,它们是在早石炭世间歇性海平面上升过程中形成的,其同时期形成的沉积地层分别为下石炭统东河砂岩段、生屑灰岩段、下泥岩段中上部。洞穴层内部多旋回“坍塌角砾-地下河沉积”组合是斜坡内陆区潜流面的迟后上升效应,洞穴层与洞穴等时层的时空对应关系对于大型古岩溶事件的断年及洞穴层的分布预测具有重要意义。

    Abstract:

    Cave horizons are an indicator of recognizing multiple karst cycles, and a linkage between karst cycles and sedimentary sequences and cycles of sea level change. Based on the principle that caves develop along the water table in a condensed carbonate land, cave horizons are correlated and caves identified from wells are reconstructed in paleogeomorphic sections. The order of cave horizons is deduced with evidence from the study of geological conditions of paleokarst and inner cave sediments configuration. A correlation of cave horizons across different carbonate lands in this basin is made in accordance with the relationship between synchronous beds and cave horizons in time and space. A systematic model is introduced for interpreting the differences of caves developed on island, near shore and inland of slopes. The results of this study indicate that three cave horizons were developed in the Lower to Middle Ordovician in the Tabei, Tazhong and Hotan uplifts during the Early Hercynian. Younger upward, they are developed during the intermissive rising of sea level in the Early Carboniferous. Their synchronous beds correspond to the Donghe sandstones, bioclastic limestones and lower mudstones (the highstand systems tracts of three sedimentary sequences in the Early Carboniferous). The multicyclic "collapsed breccias interbedded with underflow sediments" were caused by the rising of underflow surface posterior to the rising of water table in the inland of basin marginal slope, which is caused by abrupt rising of sea level. The relationship between the synchronous beds and the cave horizons in time and space is significant in dating paleokarst events and predicating cave horizons.

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徐国强 李国蓉 刘树根 武恒志 田纳新 李智武.2005.塔里木盆地早海西期多期次风化壳岩溶洞穴层[J].地质学报,79(4):557-568.
Xu GuoJiang;Li GuoRong;Liu ShuGen;Wu HengZhi;Tian NaXin;Li ZhiWu.2005. Multiple Karst Cave Horizons in the Early Hercynian Weathering Crust in the Tarim Basin[J]. Acta Geologica Sinica,79(4):557-568.

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  • 最后修改日期:2004-09-28
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