南海北部莺琼盆地钙质超微化石年代地层研究

CHRONOSTRATIGRAPHY OF CALCAREOUS NANNOFOSSILS IN THE YINGGEHAI-QIONGDONGNAN BASIN,NORTHERN SOUTH CHINA SEA

本文依据南海北部大陆架莺琼盆地67口钻井的钙质超微化石资料,结合ODP184航次、2004年国际地质年代表等国内外几十年以来的研究成果,探讨了研究区渐新统以来31个钙质超微化石属种的地质年代意义,厘定了18个化石带及3个联合化石带。讨论了乐东组、莺歌海组、黄流组、梅山组、三亚组、陵水组和崖城组的时代归属以及更新统与上新统、上新统与中新统、上中新统与中中新统、中中新统与下中新统、中新统与渐新统界线的钙质超微化石划分标志,建立起可与全球对比的莺琼盆地高精度年代地层格架。

Chronostratigraphy implications of 31 species of calcareous nannofossils are clarified respectively,18 zones and 3 combined zones are renewed based on abundant calcareous nannofossils from 67 cores in Yinggehai-Qiongdongnan Basin,northern South China Sea,together with recent progress of ODP Leg 184 and the international standard chronostratigraphic timescale（2004）.The ages of the Yacheng Formation,Lingshui Formation,Sanya Formation,Meishan Formation,Huangliu Formation,Yinggehai Formation and Ledong Formation are discussed according to the calcareous nannofossils analysis.Fossil correlation symbols from Oligocene are affirmed in the study area.