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Exploring Sea Country through high-resolution 3D seismic imaging of Australia’s NW shelf: Resolving early coastal landscapes and preservation of underwater cultural heritage
Quaternary Science Reviews ( IF 4 ) Pub Date : 2020-07-01 , DOI: 10.1016/j.quascirev.2020.106353
Michael J. O’Leary , Victorien Paumard , Ingrid Ward

Abstract Almost 2 million square km of Australia’s continental shelf was flooded following the termination of the last glacial maximum, and with it the cultural heritage of the first arrival and coastal occupation of Australia beginning some 65,000 years ago. In order to prospect for this missing cultural record, we must first identify submerged coastal landscapes and landforms that likely provided favourable environments for occupation and resource use. However, this task is challenged by the sheer size of the Australian continental margin. To help address this, we use industry 3D seismic datasets, that cover vast areas of Australia’s continental shelf, to map seafloor bathymetry at high resolution (10–25 m). Our study focuses an area of 6500 square km on the mid/outer shelf regions proximal to Barrow Island. The 3D seismic bathymetry revealed a highly complex and geomorphically mature coastal landscape preserved at depths of 70–75 m below sea level, including coastal barrier dunes, lagoonal systems, tidal flats and estuarine channels. Based on the depth of the submerged shorelines and reconstructed sea level curves, the age range of these coastal landforms is constrained to Marine Isotope Stage 3 (57–29 ka), which overlaps with the known onset of occupation at Barrow Island and the wider Carnarvon bioregion and the adjacent Pilbara. Such feature preservation has significant geoheritage value, but also allows for human behavioural ecology modelling and provides targets for future dating and site survey.

中文翻译:

通过澳大利亚西北大陆架的高分辨率 3D 地震成像探索海洋国家:解决早期沿海景观和保护水下文化遗产

摘要 在最后一次冰期结束后,近 200 万平方公里的澳大利亚大陆架被洪水淹没,随之而来的是大约 65,000 年前澳大利亚首次抵达和沿海占领的文化遗产。为了寻找这种缺失的文化记录,我们必须首先确定可能为职业和资源利用提供有利环境的淹没沿海景观和地貌。然而,这项任务受到澳大利亚大陆边缘的巨大挑战。为帮助解决这个问题,我们使用行业 3D 地震数据集,覆盖澳大利亚大陆架的广大区域,以高分辨率 (10-25 m) 绘制海底测深图。我们的研究集中在巴罗岛附近的中/外陆架区域 6500 平方公里的区域。3D 地震测深揭示了高度复杂且地貌成熟的沿海景观,保存在海平面以下 70-75 m 的深度,包括沿海沙丘、泻湖系统、潮滩和河口河道。根据淹没海岸线的深度和重建的海平面曲线,这些沿海地貌的年龄范围被限制在海洋同位素第 3 阶段(57-29 ka),这与巴罗岛和更广泛的卡那封的已知占领开始重叠生物区和邻近的皮尔巴拉。这样的特征保存具有重要的地质遗产价值,但也允许人类行为生态学建模并为未来的约会和现场调查提供目标。泻湖系统、潮滩和河口河道。根据淹没海岸线的深度和重建的海平面曲线,这些沿海地貌的年龄范围被限制在海洋同位素第 3 阶段(57-29 ka),这与巴罗岛和更广泛的卡那封的已知占领开始重叠生物区和邻近的皮尔巴拉。这样的特征保存具有重要的地质遗产价值,但也允许人类行为生态学建模,并为未来的约会和现场调查提供目标。泻湖系统、潮滩和河口河道。根据淹没海岸线的深度和重建的海平面曲线,这些沿海地貌的年龄范围被限制在海洋同位素第 3 阶段(57-29 ka),这与巴罗岛和更广泛的卡那封的已知占领开始重叠生物区和邻近的皮尔巴拉。这样的特征保存具有重要的地质遗产价值,但也允许人类行为生态学建模并为未来的约会和现场调查提供目标。这与已知的巴罗岛和更广泛的卡那封生物区和邻近的皮尔巴拉的占领发生重叠。这样的特征保存具有重要的地质遗产价值,但也允许人类行为生态学建模并为未来的约会和现场调查提供目标。这与已知的巴罗岛和更广泛的卡那封生物区和邻近的皮尔巴拉的占领发生重叠。这样的特征保存具有重要的地质遗产价值,但也允许人类行为生态学建模并为未来的约会和现场调查提供目标。
更新日期:2020-07-01
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