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日本千叶综合剖面下-中更新世亚统（卡拉布里亚阶-奇凡阶）边界的古海洋学与甲藻孢囊地层学

Paleoceanography and dinoflagellate cyst stratigraphy across the Lower-Middle Pleistocene Subseries (Calabrian-Chibanian Stage) boundary at the Chiba composite section, Japan.

作者信息

Balota Eseroghene J, Head Martin J, Okada Makoto, Suganuma Yusuke, Haneda Yuki

机构信息

Department of Earth Sciences, Brock University, St. Catharines, ON L2S 3A1 Canada.

Department of Earth Sciences, Ibaraki University, 2-2-1 Bunkyo, Mito, Ibaraki, 310-8512 Japan.

出版信息

Prog Earth Planet Sci. 2021;8(1):48. doi: 10.1186/s40645-021-00438-3. Epub 2021 Sep 1.

DOI:10.1186/s40645-021-00438-3
PMID:34722118
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC8550375/
Abstract

UNLABELLED

A dinoflagellate cyst record from the highly resolved Chiba composite section in Japan has been used to reconstruct sea-surface paleoceanographic changes across the Lower-Middle Pleistocene Subseries (Calabrian-Chibanian Stage) boundary at the global stratotype, constituting the first detailed study of this microfossil group from the Pleistocene of the Japanese Pacific margin. Cold, subarctic water masses from 794.2 ka gave way to warming and rapid retreat of the Subpolar Front at 789.3 ka, ~ 2000 years before the end of Marine Isotope Stage (MIS) 20. Throughout the fully interglacial conditions of MIS 19c, assemblages are consistent with warm sea surface temperatures but also reveal instability and latitudinal shifts in the Kuroshio Extension system. The abrupt dominance of cysts between 772.9 and 770.4 ka (MIS 19b) registers the influence of cooler, mixed, nutrient-rich waters of the Kuroshio-Oyashio Interfrontal Zone resulting from a southward shift of the Kuroshio Extension. Its onset at 772.9 ka serves as a local ecostratigraphic marker for the Chibanian Stage Global Boundary Stratotype Section and Point (GSSP) which occurs just 1.15 m (= 1300 years) below it. An interval from 770.1 ka to the top of the examined succession at 765.8 ka (MIS 19a) represents warm, presumably stratified but still nutrient-elevated surface waters, indicating a northward shift of the Kuroshio Extension ~ 5 kyrs after the termination of full interglacial conditions on land.

SUPPLEMENTARY INFORMATION

The online version contains supplementary material available at 10.1186/s40645-021-00438-3.

摘要

未标注

来自日本千叶综合剖面高分辨率的甲藻孢囊记录已被用于重建全球层型剖面下-中更新世亚统（卡拉布里亚-千叶阶）边界处的海面古海洋学变化，这是对日本太平洋边缘更新世该微体化石群的首次详细研究。794.2 ka时的寒冷亚北极水体被789.3 ka时的变暖以及副极地锋的快速南撤所取代，这比海洋同位素阶段（MIS）20结束约早2000年。在MIS 19c的整个完全间冰期条件下，组合与温暖的海面温度一致，但也揭示了黑潮延伸系统的不稳定性和纬度变化。772.9至770.4 ka（MIS 19b）期间 孢囊的突然占主导地位记录了黑潮延伸向南移动导致的黑潮-亲潮锋面间带较冷、混合且营养丰富水体的影响。其在772.9 ka开始，作为千叶阶全球界线层型剖面和点（GSSP）的当地生态地层标志，该GSSP就在其下方1.15米（=1300年）处。从770.1 ka到所研究层序顶部765.8 ka（MIS 19a）的间隔代表温暖的、可能分层但仍营养丰富的表层水，表明在陆地完全间冰期条件结束约5 kyr后黑潮延伸向北移动。

补充信息

在线版本包含可在10.1186/s40645 - 021 - 00438 - 3获取的补充材料。

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