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菲律宾海西部DSDP2 92孔深海介形虫在渐新世以高值的丰度、分异度和新生率为特征 ,是适宜于深海介形虫生存的时期 ;而晚第三纪时期丰度和分异度显著下降 ,加上多次出现的灭绝 ,表明底层水环境的恶化 .根据丰度、分异度、演化活动 (新生和灭绝 )识别出介形虫动物群的 5个主要变化事件 ,分别发生在渐新世早期(P1 8)、渐新世中期 (P2 1 )、中新世最早期 (N4)、中中新世早期 (N8)和上新世晚期(N2 1 ) ,记录了新生代西太平洋和菲律宾海底层水逐步变冷的历史 .
In the Oligocene, the DSDP2 92-hole deep sea Ostracoda in the western part of the Philippines is characterized by high abundance, differentiation and neonate rate, which is suitable for the survival of OECs. In the late Tertiary period, the abundance and The distinct decline of the diversity and the occurrence of multiple extinctions indicate the deterioration of the groundwater environment. Five major changes in the ostracod fauna were identified based on abundance, differentiation, and evolution (new and extinct) Respectively occurred in the early Oligocene (P1 8), mid-Oligocene (P2 1), early Miocene (N4), early Middle Miocene (N8) and late Pliocene (N2 1) The history of the Cenozoic subcontinental water cooling gradually in the Western Pacific and the Philippines.