塔斯曼海南部更新世放射虫的生物地层学

本研究利用保存丰富、完好的放射虫对塔斯曼海更新世层序进行地层学分析。对塔斯曼海南部更新世的KH94-4TSP-4PC岩芯的放射虫组合进行了详细的生物地层学分析,并从8 .6 m长的岩芯中识别出83种放射虫。依据放射虫属种的出现和消失,可得到两个放射虫带,即Chi带(老)和Psi带(新)。Chi带的顶部以Saturnalis cir-culariHaeckel ,Cycladophora pliocenicaHays的最后出现和Triceraspyris antarcticaHaecker的首次出现为标志。Psi带的顶部以Stylatractus universusHay和Antarctissa cylindricaPetrushevskaya的最后出现为标志。这些放射虫带可与浮游生物的有孔虫Globorotalia ( G.) truncatulinoides带进行对比。

PLEISTOCENE BIOSTRATIGRAPHY OF RADIOLARIANS FROM THE SOUTH TASMAN SEA

Abundant, generally well preserved radiolarians were used in stratigraphic analysis of Pleistocene sequences of Tasman Sea. Detailed biostratigraphic study has been undertaken of radiolarian assemblages in Pleistocene piston core KH94-4TSP-4PC, South Tasman Sea. Eighty three radiolarian species were identified from the 8.6 m long core. Two radiolarian zones, namely the Chi (older) and the Psi (younger) zones have been observed, based on the appearance and disappearance of species. The top of Chi zone is marked by the last appearance of Saturnalis circularis Haeckel, last appearance of Cycladophora pliocenica (Hays) and first appearance of Triceraspyris antarctica (Haecker). The top of the Psi zone is marked on the basis of last appearance of Stylatractus universus Hays and Antarctissa cylindrica Petrushevskaya. These radiolarian zones are correlated to the planktonic foraminiferal Globorotalia (G.) truncatulinoides Zone.