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新元古代十三里台期辽南徐淮地区的叠层石组合以 Conophyton ocularoides与 Baicalia共生为特色 ,Inze-ria、Gymnosolen、Tungussia、Jurusania、L inella等的相继集中出现为代表 ,叠层石的丰度和分异度极高 ,达到叠层石演化史上的鼎盛时期。类似的叠层石组合在世界各地晚里菲期中频有发现。至马家屯期 ,叠层石进入逐步衰退阶段 ,叠层石多组成半球状生物岩礁 ,柱体细小、相互密集丛生、分叉复杂、大多具壁或鞘 ,柱间充填大量叠层石砾屑和陆源石英碎屑 ,同时叠层石微结构发生明显变化 ,出现特征的半球形放射纤维状组构。十三里台期叠层石组合特征明显、组分相对稳定 ,不仅在区域间 ,甚至在洲际间具有地层对比的潜力。
The stratigraphic assemblages of Xuhui area in the south of the Neoproterozoic in southern Liaoning Province are characterized by the concomposition of Conophyton ocularoides and Baicalia, the successive occurrences of Inze-ria, Gymnosolen, Tungussia, Jurusania and L inella, The abundance and degree of differentiation is extremely high, reaching the heyday of the evolution of the stratum. Similar stratiform assemblages have been discovered in the late Philippine period IF throughout the world. In the Majiatun period, the stratum of stratum entered a stage of gradual decline. The stratum consisted of hemispherical bio-rock reefs. The stratums were small, densely clustered, complex and bifurcated, most of them were wall or sheath, with a large amount of laminated gravel Debris and terrigenous quartz debris, at the same time, the microstructure of the stratum obviously changed and the characteristic hemispherical radial fibrous structure appeared. The Thirteen-Lamelled Shikou combination is characterized by its relatively stable composition and potential for stratigraphic correlation not only between regions but also across the continent.