Determination and geological implication of O-Si isotope of the sediment core in the CC area, the Pacific Ocean |
| |
Authors: | Shiying Wu Tiping Ding Xianwei Meng Liming Bai |
| |
Institution: | (1) First Institute of Oceanography, State Oceanic Administration, 266003 Qingdao, China;(2) Institute of Mineral Deposits, Chinese Academy of Geosciences, 100037 Beijing, China |
| |
Abstract: | Conclusions
1. |
It is a successful attempt to test and study O-Si stable isotopic composition of SiO2 shells of radiolarian of sediment core below the depth of 5 000 m in the Pacific Ocean because of lacking of calcium shells
below CCD in ocean. The distribution and variation, from 21.2 X 10−3 to 34.5 × 10−3 for δ18OSMOW and from 0.2 × 10−3 to 1.2 × 10−3 for δ30SiNBS-28, have certain link with and difference from those of other oceanic organisms.
|
2. |
The relationship between δ18O and δ30Si values indicates obviously that the humeric distribution of core samples from No. 1787 station shows two groups separated
by the depth of 160 cm. This distribution is also recorded by two kinds of isotopic curves (fig. 2(a), (b)), reflecting the
evolutional difference of oceanic environment and stratigraphic sequence between the upper and lower layers separated by the
depth of 160 cm.
|
3. |
Through a correlation of δ18O values, the core from No. 1787 station shows that since 27 Ma, the Pacific Ocean has experienced 7 cold/warm changes, accompanied
by the frequent variations of global ice volume and sea level.
|
|
| |
Keywords: | radiolarian shell O-Si isotope cold/warm change |
本文献已被 SpringerLink 等数据库收录! |
| 点击此处可从《中国科学通报(英文版)》浏览原始摘要信息 |
| 点击此处可从《中国科学通报(英文版)》下载免费的PDF全文 |
|