首页|期刊导航|中国海洋湖沼学报(英文版)|Episodes of volcanic activity and their environmental effects in the Okinawa Trough during the last 150 ka
中国海洋湖沼学报(英文版)2005，Vol.23Issue(4)：363-367,5.
Episodes of volcanic activity and their environmental effects in the Okinawa Trough during the last 150 ka
Episodes of volcanic activity and their environmental effects in the Okinawa Trough during the last 150 ka
摘要
Abstract
A piston core Z14-6 was used in this study. The core, 896 cm long, was collected from eastern slope of the Okinawa Trough (27°07′N, 127°27′E, water depth 739m). The δ18O and δ13C values of the sediment bearing planktonic foraminifera G. sacculifer and N. dutertrei were determined; and the abundance of volcanic glass was analyzed. The volcanic glass content high occurred in early stage of polar ice-sheet growth period, or the beginning of cold climate periods corresponding to Milankovitch cycles (Peak Ⅰ, Ⅱ and Ⅴ are corresponding to the beginnings of oxygen isotopic stages 2, 4 and 6, and Peak Ⅲ and Ⅳ are matching oxygen isotopic stage 5b-5d.). It might be possible that volcanic episodes and climate changes were responding to orbital forcing in the Okinawa Trough in late Quaternary. The δ18O difference between N. dutertrei and G. sacculifer shows no clear correlation to the volcanic glass content high, which suggests that the volcanic eruptions did not influence the structure of upper water column. However, the low δ13C difference between G. sacculifer and N. dutertrei is coeval with the volcanic glass high or sub-high content. This fact suggests that volcanic eruptions might influence the reduction in vertical nutritional gradient and carbon cycle process in upper water column. A possible mechanism is that huge quantity of ash and dust had weakened the light intensity, resulting in photosynthesis reduction, productivity decrease, and biological pumping.关键词
environmental effects/volcanic activity/Okinawa Trough/Late QuaternaryKey words
environmental effects/volcanic activity/Okinawa Trough/Late Quaternary分类
海洋科学引用本文复制引用
..Episodes of volcanic activity and their environmental effects in the Okinawa Trough during the last 150 ka[J].中国海洋湖沼学报(英文版),2005,23(4):363-367,5.基金项目
This study is supported by the Knowledge Innovation Program ofChinese Academy of Sciences(Project No.KZCX3-SW-220),NSFC (No.90411014 and 40176019)and the National Major Fundamental Researchand Development Project(No. G20000467). （Project No.KZCX3-SW-220）
