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-  2015 

额济纳盆地GN100钻孔不同沉积相的粒度特征

Keywords: 额济纳盆地
沉积环境

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Abstract:

内蒙额济纳盆地GN100钻孔的沉积相可划分为河流相、湖泊相、沼泽相及风成砂沉积。对该钻孔不同沉积相代表性 沉积物的粒度分析表明:额济纳盆地沉积物的粒度特征能够有效区分沉积环境和动力过程。河流相沉积物主要粒度组分为 粗砂,以滚动搬运为主,判别值Y为大于1;风成砂主要粒度组分为细砂,Y值范围主要在0附近;沼泽相也以细砂为主且 较风成砂更细,Y值主要为负值且小于风成砂;湖相粒度组分主要为细粉砂,以悬浮搬运为主,但不完全是静水悬浮搬 运,相比于静水沉积相对颗粒偏大,而Y最小,为小于-9。这些结果可以为区域沉积环境的准确解释提供参考。
TheEjinabasin,locatedinthearidareainNWChina,underwentcomplicateddepositionalprocessesduringQuaternary. Basedoncharacteristicsofdifferentsedimentarystructures,a18mlongsedimentcorefromthecenteroftheEjinaBasincanbe divided into fluvial, aeolian, swamp and lacustrine sediments. The grain-size analysis shows that the depositional environment, transportdynamicsintheEjinabasincanbedistinguishedbycharacteristicofgrain-sizedistribution.Themajorgrain-sizecomponent offluvialsedimentwascoarsesandandYvaluewasgreaterthan1;themajorgrain-sizecomponentofaeoliansandwasfinesandandY valuewascloseto0;themajorgrain-sizecomponentofswampsedimentwasalsofinesandbutfinerthanaeoliansand,withanegative Yvalues;themajorgrain-sizecomponentoflacustrinesedimentwasfinesiltwhichwastransportedbysuspension,butdifferentwith settledowndepositinstandingwater,andYvalueswaslessthan-9.Theseresultsshowcharactersofgrainsizedistributioncanbe usedfordistinguishingdifferenttransportprocessesanddynamics,which,inturn,isabletoprovidecriticalinformationforaccurate interpretationofthedepositionalenvironmentchangeinthisarea.

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