南米高地における湖古環境変動解析

南美洲高地湖泊古环境变化分析

• 批准号: 14F04799
• 负责人: WALLIS R・Simon
• 金额: $ 1.47万
• 依托单位: Nagoya University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for JSPS Fellows
• 财政年份: 2014
• 资助国家: 日本
• 起止时间: 2014-04-25 至 2017-03-31
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-14F04799/
• 关键词: Bolivia; Tufa; Altiplano; Paleoenvironment; tufa; paleoclimate; ostracods; bioherm; 南米; 湖; 古環境; 古段丘; 炭酸塩岩; 安定同位体

The 14C dating of tufa samples from Laguna Hedionda suggests that the age of this deposit is 10,036 to 9,642 cal yrs BP. Stable isotope analysis of tufa from Uyuni overlap with previous studies of tufa from the same area (δ18O +0.73 ± 0.05 to －2.59 ± 0.05‰ and δ13C +4.78 ± 0.02 to +2.94 ± 0.02‰) that formed during the last major lake phases. Analysis of tufa from the Lipez Lakes are internally consistent and, after secondary carbonate values are removed, illustrate a difference between the capping tufa found around Laguna Hedionda and Chiar Khota (δ18O +2.55 to －0.12‰ and δ13C +6.23 to +1.29‰) and the beach tufa found around Laguna Honda and Ramaditas (δ18O +2.93 to +1.29‰ and δ13C +5.23 to +1.60‰). For this study the capping tufa is the most appropriate to examine in more detail as it is less likely to have been contaminated by groundwater.The data show a general signal of aridity across all tufa samples, as well as high-resolution evidence for annual or seasonal variations in rapidly formed laminated tufa. Combined with the age data from these deposits it can be suggested that the formation of these tufa, as well as Lipez Lakes above present day depths, is associated with the wet phase in the northern Chile basins to the south rather than the large lakes on the central and northern Altiplano to the north. Further work needs to be carried out in the remote regions on the Altiplano to find further high-resolution climate proxies to better understand regional climate systems.

拉古纳海迪昂达凝灰岩样品的~（14）C测年表明，该存款的年龄为10036 ~ 9642 cal yrs BP。对乌尤尼石灰华的稳定同位素分析结果与之前对同一地区石灰华的研究结果（δ 18 O +0.73 ± 0.05至-2.59 ± 0.05‰，δ 13 C +4.78 ± 0.02至+2.94 ± 0.02‰）重叠，这些石灰华形成于最后的主要湖泊阶段。利佩兹湖的石灰华分析是内部一致的，在去除次生碳酸盐值后，说明了在拉古纳赫迪翁达和恰尔霍塔周围发现的覆盖石灰华之间的差异（δ 18 O +2.55 ~-0.12‰，δ 13 C +6.23 ~+1.29‰）和拉古纳、本田、拉马迪塔斯附近的海滩钙华（δ 18 O +2.93 ~+1.29‰，δ 13 C +5.23 ~+1.60‰）。在这项研究中，盖层凝灰岩是最适合进行更详细研究的，因为它不太可能受到地下水的污染。数据显示，所有凝灰岩样品都有干旱的一般信号，以及快速形成的层压凝灰岩的年度或季节变化的高分辨率证据。结合这些沉积物的年龄数据，可以认为，这些凝灰岩的形成，以及利佩兹湖以上的今天的深度，是与湿相在北方智利盆地南部，而不是中央和北方高原北部的大湖。需要在高原上的偏远地区开展进一步的工作，以找到更多的高分辨率气候代理，以更好地了解区域气候系统。

项目成果

Ambiguous biogeographical patterns mask a more complete understanding of the Ordovician to Devonian evolution of Japan

模糊的生物地理模式掩盖了对日本奥陶纪到泥盆纪演化的更完整的理解

• DOI: 10.1111/iar.12067
• 发表时间: 2014
• 期刊: Island Arc
• 影响因子: 1.5
• 作者: Mark Williams;Simon Wallis;Tatsuo Oji andPhilip D. Lane
• 通讯作者: Tatsuo Oji andPhilip D. Lane

Flamingos, salt lakes and volcanoes the hunt for evidence of past climate change on the high Altiplanoof Bolivia

火烈鸟、盐湖和火山在玻利维亚高原寻找过去气候变化的证据

• 发表时间: 2017
• 期刊: Geology Today
• 作者: Paul P. Brooks;Makoto Ouchi;Mitsuo Sawamoto;Lian R. Hutchings;Francesco BARBIERI;Nicola Clark and Simon Wallis
• 通讯作者: Nicola Clark and Simon Wallis

Crenostrea sp. cf. C. cannoni (Marwick, 1928)(Bivalvia: Ostreoidea) and associated fauna from east of Heard Island, Kerguelen Plateau: age and palaeoenvironmental value, Alcheringa:

镰甲藻属

• DOI: 10.1080/03115518.2015.965545
• 发表时间: 2015
• 期刊: An Australasian Journal of Palaeontology
• 作者: Patrick G. Quilty;Nicola Clark & Ty Hibberd
• 通讯作者: Nicola Clark & Ty Hibberd