澳大利亚North Carnarvon盆地晚三叠世Mungaroo组大型浅水辫状河三角洲沉积充填特征及模式

来源期刊:中南大学学报(自然科学版)2015年第8期

论文作者:朱红涛 夏晨晨 杨香华 黄众 庄文娟 曹秀荣 曾智伟

文章页码:2983 - 2992

关键词:浅水辫状河三角洲;季风气候;沉积充填演化;Mungaroo组;North Carnarvon盆地

Key words:shallow water braided river delta; monsoon climate; sediment infiling; Mungaroo formation; north Carnarvon basin

摘    要:对澳大利亚North Carnarvon盆地三叠纪Mungaroo三角洲的钻井、地震、岩心、薄片等资料进行分析,结合季风强盛期、减弱期、间歇期的气候交替变化,建立研究区不同季风阶段对应的浅水辫状河三角洲的沉积充填序列、迁移演化规律,并总结其沉积模式。研究结果表明:Mungaroo三角洲具有以下典型沉积特征:主体发育三角洲平原相带,普遍发育正粒序河道充填沉积;河道砂岩与富有机质泥岩(薄煤层)频繁互层;碎屑颗粒分选和磨圆均较差,但石英颗粒含量较高;主要发育平行-亚平行地震相,局部发育叠瓦状前积地震反射;季风性气候控制明显,高山植物孢粉与低地植物孢粉交互式变化。

Abstract: The drilling, seismic, cores and thin section data of Mungaroo delta in North Carnarvon Basin of Australia were analyzed. Sedimentary sequence and migration evolution of shallow braided river delta in different monsoon stages were built through the sedimentary background, sedimentary features and intermittent stage of monsoon climate change, and the depositional model of Mungaroo Formation, North Carnarvon Basin was built. The results show that Mungaroo delta has five typical sedimentary characteristics: Delta plain facies is well developed and normal graded channel deposition is widespread; Channel sandstone and the mudstone rich of organic matter are interbedded frequently; Clast granules are poorly sorted and rounded but rich of quartz granule; Mungaroo Formation in late Triassic generally develops parallel-subparallel seismic facies and locally imbricate progradation reflection seismic facies; Sporopollen of alpine vegetation and lowerland plant changes interactively under the control of monsoon climate.

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