新疆柴窝堡盆地侏罗纪孢粉地层学

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根据孢粉组合特征及其与国内外有关资料的对比、分析,认为三工河组的孢粉组合时代为早侏罗世晚期,西山窑组和头屯河组的孢粉组合时代为中侏罗世。对柴窝堡盆地侏罗系沉积发育特征、各岩组所含孢粉组合面貌及其地质时代作了研究,建立了可信的侏罗系层序:水西沟群包括下统的八道湾组和三工河组、中统下部的西山窑组,艾维尔沟群包括中统的头屯河组和上统的齐古组与喀拉扎组。研究证实,早至中侏罗世早期该盆地气候温湿,植被发育,沉积以河湖相为主,为重要成煤及生油期;中侏罗世晚期至晚侏罗世受燕山运动影响盆地抬升,气候逐步变得干热,沉积以红色粗碎屑河流或山麓河流相为主。 According to the characteristics of sporopollen assemblages and their correlation with the relevant data at home and abroad, it is concluded that the age of sporopollen assemblages in the Sangonghe Formation was Early Jurassic, the age of sporopollen assemblages in Xishanyao Formation and Toutunhe Formation was Middle Jurassic Luo world. The Jurassic sedimentary development characteristics of the Chaiwopu Basin, the assemblage of sporopollen assemblages and geologic age in each group of rocks are studied, and a credible Jurassic sequence is established: the Shui Xigou group includes the lower reaches of Badaowan Group and the Sangonghe Formation, the lower Xishanyao Formation and the Avilogou Formation of the Central Plains include the Toutunhe Formation of the Central Plains and the Qigu and Early Cretaceous formations of the upper member of the Central Plains. The study confirmed that as early as the Middle Jurassic, the climate of this basin was warm and humid, the vegetation was developed, and the sediments were dominated by rivers and lakes, which were the important coal-forming and oil-producing periods. From Late Middle Jurassic to Late Jurassic, The basin is uplifted and the climate gradually becomes dry and hot. Sediments are dominated by red coarse debris rivers or foothills.
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