从日本中部的石笋推断中更新世的气候快照

IF 4 3区地球科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY

Geoscience Letters Pub Date : 2024-09-09 DOI:10.1186/s40562-024-00357-3

Masataka Sakai, Masako Hori, Ryu Uemura, Bassam Ghaleb, Daniele L. Pinti, Mahiro Yumiba, Masafumi Murayama, Akihiro Kano

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引用次数: 0

摘要

石笋是重建古气候的有用档案：大多数古气候研究都使用分布在特定地点和年代的石笋。我们研究了从石灰岩地区有限的日本中部奈良县采集的石笋（GYM-1）。应用 238U-234U 方法，确定了 GYM-1 的年龄为 744 ± 70 至 677 ± 74 ka（仅基于分析不确定性，1σ）。即使假设 234U/238U 的初始活度（234U/238U）0 有 10%的不确定性，这个年龄仍可能早于 460 ka。根据流体包裹体中的δD 和碳酸钙中的δ18O 计算出的温度范围为 9.0 至 11.9 °C（平均为 10.8 ± 0.9 °C）或 6.0 至 9.1 °C（平均为 7.9 ± 0.9 °C），具体取决于方程。估计温度表明，GYM-1 形成于中更新世的间冰期。同位素值与层理的同步行为很可能反映了高度通风的洞穴系统中的季节性温度。

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A snapshot of the climate in the Middle Pleistocene inferred from a stalagmite from central Japan

Stalagmites are useful archives in reconstructing paleoclimates: most paleoclimate studies used stalagmites that are distributed in specific locations and ages. We examined a stalagmite (GYM-1) collected from Nara Prefecture, central Japan, where limestone areas are limited. Applying 238U–234U method, the ages of GYM-1 were determined as 744 ± 70 to 677 ± 74 ka (based only on analytical uncertainties, 1σ). Even assuming a 10% uncertainty in the initial activity of 234U/238U, (234U/238U)0, this age could be still older than 460 ka. Temperatures calculated based on δD in the fluid inclusions and δ18O in the calcium carbonate ranged from 9.0 to 11.9 °C (10.8 ± 0.9 °C on average) or from 6.0 to 9.1 °C (7.9 ± 0.9 °C on average) depending on the equation. The estimated temperature suggests that GYM-1 formed during an interglacial period of the Middle Pleistocene. Synchronous behavior of isotopic values with lamination likely reflects seasonal temperature in a highly ventilated cave system.

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来源期刊

Geoscience Letters Earth and Planetary Sciences-General Earth and Planetary Sciences

CiteScore

4.90

自引率

2.50%

发文量

审稿时长

25 weeks

期刊介绍： Geoscience Letters is the official journal of the Asia Oceania Geosciences Society, and a fully open access journal published under the SpringerOpen brand. The journal publishes original, innovative and timely research letter articles and concise reviews on studies of the Earth and its environment, the planetary and space sciences. Contributions reflect the eight scientific sections of the AOGS: Atmospheric Sciences, Biogeosciences, Hydrological Sciences, Interdisciplinary Geosciences, Ocean Sciences, Planetary Sciences, Solar and Terrestrial Sciences, and Solid Earth Sciences. Geoscience Letters focuses on cutting-edge fundamental and applied research in the broad field of the geosciences, including the applications of geoscience research to societal problems. This journal is Open Access, providing rapid electronic publication of high-quality, peer-reviewed scientific contributions.