【摘要】 <正> 一、前言世界若干地区有关二叠纪非(虫莛)有孔虫(下简称有孔虫)的研究已有百余年的历史,但至今大多限于化石形态、构造及分类上的研究。近年来,海相二叠纪含油、气层的发现,其中富含的有孔虫化石越来越引起人们的注意,特别是有孔虫的生态以及迄今尚未详细研究的二叠纪各时期有孔虫组合特征,均有必要深入进行综合分析,以适应当前石油地质科学发展的需要。我国华南地区海相二叠系的分布极广,并含十分丰富的有孔虫,是研究二叠纪有孔虫更多还原

【Abstract】 Permian forams (excluding fusulinids) discovered so far in the region covering Guangdong, Guangxi, Hunan and Hubei are represented by warm water forms resembling the Tethys fauna in nature.The abundant and wides- pread genera such as Pachphloia, Robuloides and Padangia of this region are commonly encountered in the contemporaneous Tethys fauna. Colaniella and Pseudocolaniella occurring in this region are typical forms of the latter.Five assemblages are recognized on the basis of their distinct taxa, distribution and ecological characteristics (Table 1 ).Early Permian assemblages:1. The Hcmigordius decorus-Mnltidiscus pygmaeus assemblage occurs in the lower part of Lower Permian Qixia Formation. The Horizon containing this assemblage is equivalent to the fusulinid zone of Misellina claudiae.Main elements of this assemblage are Hemigordius decorus, H. parvulus, H. ovatus, Multidiscus pygmaeus, Cribrogenerina cylindrica, Globivalvulina glaeca and Pseudoglandulina inepta. The assemblage is rich in carbonatites intercalated with carbonaceous mudstone or thin coal seams, in the south of Jiangnan Massif. The equivalent beds in the north of this massif are terrestrial coalbearing series without foraminifera.2. The Eolasiodiscus-Neodiscus maopingensis assemblage ranging from the middle to upper parts of Qixia Formation is predominated by Eolasiodis-cus which reached its climax of development during middle to late Early Permian. Other profuse elements of the assemblage are Padangia, Nodosaria, Geintzina, Pachyphloia and Glomospira in association with a few species of Neoendothyra, Cribrogenerina, Climacammina and Hemigordius.Strata containing this assemblage are bioclastic limestone with thin interealations of marl and calcareous mudstone which are equivalent to the fusulinid zones of Nankinella orbicularia and Cancellina-Parafusulinamultiseptata.3. The Hemigordiopsis orientalis-Multidiscus robustatus assemblage is found in the Lower Permian Maokou Formation in association with fusulinid zones of Neoschwagerina and Yabeina. It is the most abundant among all the Permian assemblages. Its most common and best developed species are Multidiscus robustatus, Neoendothyra permico, Globivalvulina bulloides, Cribrogenerina nana, C.obesa, Climacammina valvulinoides,Pachyphloia angula-ta, P. ovata, P. multiseptata, P. lanceolata and Geintzina tcherdynjewi. Hemigoriobsis orientalis and Multidiscus robustatus are reported only from the Maokou Formation in the region studied.Occurring in diferent facies of carbonatites this assemblage has a wide geological distribution due to the euryhaline character of most of its taxa. However, it is very abundant in pure limestone, but scarce in dolomitic lomestone and appears in small amount in siliceous limestone yielding no fu-sulinids and other fossils. Late Permian assemblages:4. The Septoglobivalvulina guangxiensis-Robuloides gibbus assemblage is encountered in biodetrital limestone of the early Late Permian Wujiaping Formation.Being monotonous, poorly preserved and predominated by uniserial forms, this assemblage is much less abundant in both taxa and populations than those of the Early Permian. This indicates that there was a degeneration of foraminiferal fauna at the beginning of Late Permian.The most predominant and widespread species of this assemblage is Robuloides gibbus while Septoglobivalvulina guangxiensis appaers only in this assemblage. Other abundant forms including Pachyphloia, Nodosaria and Pseudoglandulina,This assemblage is well-devloped in bioclastic limestone in equivalent with the fusulinid zone of Codonofusiella lui in central and western Guangxi, eastern part of northern Hunan and some localities of western Hubei. In other areas of the region studied where clastic or siliceous sediments accumulated, foraminifera have not been found or have been found to be in poor preservation.5. The Colaniella-Robuloides acutus assemblage occurring in the late Late Permian Changxing Formation is characterized by the pressence of Colaniella and Pseudocolaniell更多还原