松辽盆地深层侏罗系—下白垩统生物组合和沉积环境

摘要

本文描述了松辽盆地探井揭露的深层地层序列及其所产的5个生物门类化石组合特征。9个孢粉组合是Monosulcites—Cyathidites组合、Pinaceae-Cyathidites-Osmundacidites组合、Classopollis--Piceites组合、Lophotriletes--Cicatricosisporites组合、Paleoconiferus—Lygodiums-porites组合、Cyathidites-Leiotriletes--Clavatipollenites组合、Cicatricosisporites-Leiotriletes-Pol-yporopollenites组合、Leiotriletes-Schizaeoisporites-Classopollis组合和Trilobosporites-Cyathid-ites-Tricolpollenites组合。3个藻类组合是Vesperopsis-Australisphaera组合、Balmula granorugo-sa组合和Vesperopsis zhaodongensis组合。2个介形类组合是Cypridea unicostata-Limnocypridesadscondida组合和Mongolocypris limpida-Paracandona planiuscula组合。4个植物组合是Elato-cladus submanchurica-Ginkgoites orientalis组合、Acanthopteris gothani-Pterophylllum组合、Sphe-nopteris johnstrupii-Coniopteris nympharum组合和Platanus septentrionalis-Protophyllum undula-tun组合。3个大孢子组合是Minerisporites sp.组合、Ricinospora leavigata-Calamospora sp.组合和Arcellites组合。还介绍了叶肢介、轮藻、双壳类和鱼类化石的产出情况。结合同位素资料认为:大庆群时代为中侏罗世,火石岭组可能为贝里阿斯期,沙河子组为凡兰吟期—欧特里夫期,营城组为欧特里夫期—巴列姆期,登娄库组为巴列姆期—阿普第期早期,泉头组一-二段为阿普第—阿尔卑期,并对各组沉积环境进行了初步分析。