Palaeoceanographic records related to glacio-eustatic fluctuations in the Pleistocene Japan Sea coast based on ostracods from the Omma Formation
Palaeoceanographic records related to glacio-eustatic fluctuations in the Pleistocene Japan Sea coast based on ostracods from the Omma Formation
复制标题
基于 Omma 组介形类的更新世日本海沿岸冰川海平面波动的古海洋学记录
DOI：
10.1016/s0031-0182(01)00225-5
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发表时间：
2001
期刊：
影响因子：
--
通讯作者：
T. Kamiya
中科院分区：
文献类型：
--
作者：
Hirokazu Ozawa;T. Kamiya
约6000年冰川海平面变化对古水深的六次振荡。根据日本中部日本海沿岸诺托半岛大间组沿岸沉积中介形类组合的变化，确定了1.5-1.25Ma的时代。这是首次从浅海沉积物中发现的约1000年至2000年的冰川-海平面变化。1.5和1.3Ma，首次清晰地揭示了海平面变化幅度阶梯式加剧的过程。在Omma组中，冷水和相对较深的温水化石组合交替出现。这种发生模式表明，海平面上升与海洋气候变暖同时反复发生。与北大西洋深海沉积物记录的氧同位素波动曲线相比，这些古水深变化的周期性为数万年，六次海平面上升可被指定为氧同位素第49-39期。前三次海平面变化可能与第49、47和45阶段有关，波动幅度为10- 20米。随后是第43、41和39级，第43级的波动幅度为50- 60米，第39级的波动幅度为70- 80米。振幅增强的过程反映在这一时期高海平面时流入日本海的暖水厚度增加，从20- 30 m发展到约20- 30 m。一百米。
Six palaeo-water depth oscillations in response to glacio-eustacy during ca. 1.5–1.25Ma were recognized based on the changes of ostracod assemblages from the coastal sediments of the Omma Formation in the Noto Peninsula on the coast of the Japan Sea in central Japan. This is the first report of glacio-eustatic sea-level changes from the shallow-coastal sediments between ca. 1.5 and 1.3Ma, and the process of stepped intensification of the magnitude of the sea-level change is illustrated clearly for the first time. Shallow cold-water and relatively deeper warm-water fossil assemblages appear alternatively in the Omma Formation. This mode of occurrence indicates that sea-level rise occurred repeatedly in parallel with a marine climatic warming. These palaeo-water depth changes occurred with a periodicity of a few tens of thousands of years, and the six sea-level rises can be assigned to oxygen isotope stages 49–39, when compared with the oxygen isotope fluctuation curve from the North Atlantic deep-sea sediments records. The first three sea-level changes probably correlate with stages 49, 47 and 45, and had a magnitude of fluctuation of 10–20m. This was followed by stages 43, 41 and 39, with a magnitude of fluctuations of 50–60m for stage 43 and 70–80m for stage 39. The process of intensification of the amplitude is reflected in the increase of the thickness of warm water influx into the Japan Sea at high sea-level stand during this period, which developed from 20–30m into ca. 100m.
影响因子：
1.5
作者：
N. Ikeya;T. Cronin
通讯作者：
N. Ikeya;T. Cronin