Late Miocene-Pleistocene Calcareous Nannofossil Biostratigraphy of Shenhu Gas Hydrate Drilling Area in the South China Sea and Variations in Sedimentation Rates
详细信息
- 责任者：Chen Fang (Guangzhou Marine Geological Survey ; Guangzhou 510760 ; China) ; Su Xin
- 刊名：Earth Science
- 出版年：2013
- 卷期：38(1)
- 页码：p.1-9
- issnNo：ISSN1000-2383
- isbnNo：CN42-1233/P
摘要
The first Chinese gas hydrate drilling program was carried out on the Shenhu area in 2007and obtained gas hydrate samples.In order to understand the strata,age of the zone of gas hydrate occurrence and features of sedimentation rates,Late Miocene to Pleistocene calcareous nanofossil biostratigraphy in 4holes(SH1B,SH2B,SH5Cand SH7B)from the Shenhu gas hydrate drilling area of the northern South China Sea have been studied.A total of 17Late Miocene to Pleistocene nanofossil events are recognized.The oldest sediments recovered are in an age of late Miocene,younger than 7.362Ma,and the age assigned for gas hydrate occurrence zone is late Miocene in Hole SH2Band late Miocene to early Pliocene in Hole SH7B.Sedimentation rates varied with holes and times,increasing from Pliocene,and reaching the highest values in Holocene,for example,1.88-3.27cm/ka during Pliocene and 20-34.16cm/ka in Holocene,respectively.Sedimentation rates of 1.88cm/ka to 4.18cm/ka were estimated for sediment sequences in gas hydrate occurrence zone.The results suggest that the relationship between sedimentation rates and occurrence of gas hydrates should be more complicated than our earlier knowledge.
© 2004-2018 中国地质图书馆版权所有 京ICP备05064691号 京公网安备11010802017129号 地址：北京市海淀区学院路29号 邮编：100083 电话：办公室：(+86 10)66554848；文献借阅、咨询服务、科技查新：66554700 |