侏罗纪双壳类动物群的分布与古气候和古地理因素  

DISTRIBUTION OF JURASSIC BIVALVE FAUNAS IN RELATION TO PALAEOGEOGRAPHY AND PALAEOCLIMATE

作　　者：刘春莲[1] 

机构地区：[1]中山大学地球科学系,广州510275

出　　处：《古生物学报》1999年第4期544-550,共7页Acta Palaeontologica Sinica

摘　　要：生物群的地理分布受各种生物和环境因素的影响，对于不同地史时期以及不同的生物类型，控制生物群分布的主导因素也是不同的。就侏罗纪古大西洋双壳类动物群而言，古地理和古气候条件是影响其分布的主要环境因素。大量侏罗纪双壳类表现出明显的纬度分布特征，早侏罗世晚期至中侏罗世，一些特提斯双壳类的向北扩散是与热带－ 亚热带向北推移有关。地理障碍阻碍地区间的生物交流，导致生物差异性；而海路的形成促进生物群的扩散，造成生物面貌的一致性。这些环境因素本身又受到其它环境变量的影响。Faunal distribution is generally thought to be a result of the interaction of various related biological and environmental factors. However, for different geological time intervals and for different organisms, decisive factors governing biogeographical patterns may be different. The bivalve data obtained from the Jurassic Proto Atlantic indicate that latitudinal temperature gradients and palaeogeographical factors have greatly contributed to the distribution of bivalve faunas. A number of Jurassic characteristic bivalves from the Proto Atlantic show a clear latitudinal control. The northward dispersal of several bivalve taxa of Tethyan affinity during the Early and Middle Jurassic might have been a result of climatic amelioration. The physical barriers hindered faunal exchange and seaways promoted faunal spread. All these factors are influenced by other environmental conditions.e; Gassmann equation; elastic modulus

关 键 词：双壳类 古地理 古气候 侏罗纪 

分 类 号：Q915.817.4[天文地球—古生物学与地层学] Q914.5[生物学—古生物学]