陕西秃尾河晚三叠世孢粉植物群及其环境意义

本文基于陕西北部秃尾河地区上三叠统发现的孢子花粉化石 31属 4 8种的研究,建立了研究区晚三叠世孢粉植物群。根据孢粉植物群的特征探讨了该区晚三叠世生态环境及其与石油和煤炭形成的关系。研究结果认为,暖湿 (或湿热 )气候条件下的湖泊和沼泽沉积环境有利于油气和煤炭的形成

Late Triassic Palynoflora and Its Environmental Significance of Tuweihe, Shaanxi

Based on the investigations of 48 species of fossil spores and pollen referred to 31 genera found from the Upper Triassic Yongping and Wayaopu Formations in T uweihe region of northern Shaanxi, the Late Triassic palynoflora in the region was established in this paper. In accordance with the character of the palynoflora, the Late Triassic paleoecological environment in the region was discussed. The relation b etween the origin of petroleum and coal and the environment was involved. The re sults of this study confirm that the lacustrine depositional environments under warm/h ot and humid/wet climatic conditions might be favorable for the origin of petroleum , and the swamp/marsh depositional environments under warm/hot and humid/wet clima tic conditions might be favorable for the origin of coal.