Transition of Quaternary glacial cyclicity in deep-sea records at Nansha, the South China Sea |
| |
| Authors: | WANG Pinxian TIAN Jun CHENG Xinrong |
| |
| Institution: | Key Laboratory of Marine Geology, Ministry of Education, Tongji University, Shanghai 200092, China |
| |
| Abstract: | High-resolution oxygen isotope records over the last 2249 ka (MIS 1–86) have been obtained from cores of the upper section
(105.08 m) at ODP Site 1143 (water depth of 2772 m) drilled in the Nansha area, southern South China Sea. The sampling resolution
is at about 2 ka intervals, resulting in one of the best oxygen isotope records over the global ocean. The oxygen isotope
curves, displaying details in the Pleistocene glacial cycles, have revealed a nearly 300 ka long stage of transition from
a predominant 40 ka to 100 ka periodicity. Therefore, the “Mid-Pleistocene Revolution” should be considered as a process of
transition rather than an abrupt change. Within the 100 ka glacial cycles, the changes in tropical sea surface water were
found to lead those in high-latitude ice sheet. Our comparisons show that the ice sheet expansion and the glacial stage extension
in the Northern Hemisphere with the 100 ka cycles must have been driven not by ice sheet itself, but by processes outside
the high latitudes of the Northern Hemisphere. |
| |
| Keywords: | Quaternary glacial cycles Mid-Pleistocene Revolution oxygen isotope stages Nansha area |
| 本文献已被 万方数据 SpringerLink 等数据库收录！ |
|
