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Peesey Swamp—a Last Interglacial (MIS 5e) marine corridor across southern Yorke Peninsula, southern Australia
Australian Journal of Earth Sciences ( IF 1.2 ) Pub Date : 2021-03-31 , DOI: 10.1080/08120099.2021.1893220
T.-Y. Pan 1, 2 , C. V. Murray-Wallace 2 , R. P. Bourman 2 , A. García 2
Affiliation  

Abstract

Peesey Swamp on southern Yorke Peninsula, southern Australia, is a north-northwesterly—south-southeasterly trending lowland depression, approximately 24 km long and 4 to 10 km wide. The richly fossiliferous mollusc and foraminiferal faunal assemblages of the last interglacial Glanville Formation in Peesey Swamp indicate that the paleoenvironment was a low- to medium-energy, sheltered sandflat to shallow-water seaway during the Last Interglacial Maximum (Marine Isotope Substage [MIS] 5e; 128–116 ka). The presence of the fossil bivalve molluscs Katelysia rhytiphora, Chlamys (Equichlamys) bifrons and Fulvia tenuicostata, in life position, indicate that the paleowater depth was ≤4 m in Peesey Swamp. The seaway cut across southern Yorke Peninsula, establishing a marine connection between southern Spencer Gulf and Investigator Strait during deposition of these taxa. Amino acid racemisation dating of the fossil marine molluscs Katelysia sp. and Fulvia tenuicostata confirms that the shelly assemblages at Peesey Swamp are correlative with the last interglacial Glanville Formation, a succession of richly fossiliferous, mixed quartz–skeletal carbonate sands documented from many sites along the southern Australian coastline. This study illustrates the significant changes in the geographical configuration of coastlines that may accompany relatively modest (<5 m) sea-level changes on low-gradient coastal landscapes.

  1. KEY POINTS
  2. Peesey Swamp on southern Yorke Peninsula was flooded by seawater forming a 4 to 10 km-wide seaway during the Last Interglacial Maximum (MIS 5e).

  3. Fossil mollusc and foraminiferal assemblages reveal deposition within shallow subtidal to intertidal sandflat environments indicating that the paleowater depth and height of sea-level in Peesey Swamp was ≤4 m.

  4. Amino acid racemisation dating of fossil marine molluscs confirms that the shelly assemblages at Peesey Swamp are of last interglacial (MIS 5e) age.

  5. The distribution of the foraminifer Marginopora vertebralis indicates that the eastward flow of the warm-water Leeuwin Current, during the Last Interglacial Maximum, was retarded by the biogeographical barriers of Kangaroo Island and Fleurieu Peninsula.



中文翻译:

皮西沼泽——澳大利亚南部约克半岛南部的最后一次间冰期 (MIS 5e) 海洋走廊

摘要

位于澳大利亚南部约克半岛南部的皮西沼泽是一个北-西北-南-东南走向的低地洼地,长约 24 公里,宽约 4 至 10 公里。Peesey Swamp 中最后一次间冰期 Glanville 组富含化石的软体动物和有孔虫动物群组合表明,在最后一次间冰期最大值(海洋同位素亚级 [MIS] 5e ; 128–116 ka)。化石双壳类软体动物Katelysia rhytiphoraChlamys (Equichlamys) bifronsFulvia tenuicosta 的存在,在生活位置,表明皮西沼泽古水深≤4 m。海道横穿约克半岛南部,在这些分类群的沉积期间建立了斯宾塞湾南部和调查海峡之间的海洋连接。化石海洋软体动物Katelysia sp. 的氨基酸消旋化年代测定。和富尔维亚tenuicostat证实 Peesey Swamp 的贝壳组合与最后一个间冰期 Glanville 地层相关,这是从澳大利亚南部海岸线沿线的许多地点记录到的一系列富含化石的混合石英-骨骼碳酸盐砂。这项研究说明了海岸线地理配置的显着变化,这可能伴随着低梯度沿海景观上相对温和(<5 m)的海平面变化。

  1. 关键点
  2. 在最后一次间冰期最大值 (MIS 5e) 期间,约克半岛南部的皮西沼泽被海水淹没,形成了 4 至 10 公里宽的海道。

  3. 软体动物和有孔虫的化石组合显示在浅潮下至潮间带沙滩环境中沉积,表明 Peesey 沼泽的古水深和海平面高度≤4 m。

  4. 化石海洋软体动物的氨基酸消旋化年代确定了 Peesey Swamp 的贝壳组合是最后一次间冰期 (MIS 5e) 时代。

  5. 有孔虫Marginopora vertebralis的分布表明,在末次间冰期最大值期间,温水露纹洋流的东流受到袋鼠岛和弗勒里厄半岛的生物地理障碍的阻碍。

更新日期:2021-03-31
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