Episodes of volcanic activity and their environmental effects in the Okinawa Trough during the last 150 ka

Li Tiegang; Zhao Jingtao; Li Anchun

doi:10.1007/BF02842678

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Episodes of volcanic activity and their environmental effects in the Okinawa Trough during the last 150 ka

Updated：2023-05-16

- Episodes of volcanic activity and their environmental effects in the Okinawa Trough during the last 150 ka
- Journal of Oceanology and Limnology Vol. 23, Issue 4, Pages: 363-367(2005)
- Affiliations：
  
  Institute of Oceanology Chinese Academy of Sciences
- Author bio：
- Funds：
- DOI：10.1007/BF02842678
  CLC：
- Published：2005
- Accepted：
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Tiegang, L., Jingtao, Z. & Anchun, L. Episodes of volcanic activity and their environmental effects in the Okinawa Trough during the last 150 ka., Chin. J. Ocean. Limnol. 23, 363–367 (2005). https://doi.org/10.1007/BF02842678
DOI：

Tiegang, L., Jingtao, Z. & Anchun, L. Episodes of volcanic activity and their environmental effects in the Okinawa Trough during the last 150 ka., Chin. J. Ocean. Limnol. 23, 363–367 (2005). https://doi.org/10.1007/BF02842678 DOI：

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 foraminiferaG. sacculifer andN. 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 betweenN. dutertrei andG. 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 betweenG. sacculifer andN. 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.

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