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Microfacies of Peloidal Limestone of Middle Permian Chihsia Formation at Guangyuan, Sichuan Province and Its Sedimentary Significance
Author(s): MA Zhi-xin, LI Bo, YAN Jia-xin, XUE Wu-qiang
Pages: 449-
457
Year: 2011
Issue:
3
Journal: Acta Sedimentologica Sinica
Keyword: 似球粒; 沉积环境; 广元; 栖霞组;
Abstract: 四川广元上寺中二叠统栖霞组中段发育碳酸盐岩浅滩相.露头观察、镜下分析得出,其颗粒类型中,似球粒、包粒十分丰富,占较大比重.研究层段识别出粪球粒、巴哈马似球粒、微生物似球粒三种类型.其中以巴哈马似球粒最为常见,它是由生物碎屑的泥晶化导致的.基于颗粒类型、沉积组构的详细观察和微相分析,得出研究层段总体沉积环境为似球粒为主的浅滩,包括滩体、滩缘、滩间三个亚环境.相对前人得出的生物碎屑滩,似球粒滩形成的水...
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