Estimating the amount of uplift from the current elevation of strata at the Middle Miocene Climatic Optimum: A case study of Kibi Plateau in Southwest Japan

IF 1 4区 地球科学 Q4 GEOSCIENCES, MULTIDISCIPLINARY
Island Arc Pub Date : 2024-07-22 DOI:10.1111/iar.12531
Yo-ichiro Otofuji
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引用次数: 0

Abstract

The Middle Miocene Climatic Optimum (MMCO) formed shallow marine strata on continents and island arcs at ~15 Ma, and some of the MMCO strata later experienced uplift. The amount of uplift corresponded to sea level rise after the MMCO period, but ancient sea level could not be observed. This study uses a deductive approach to estimate the amount of uplift. The elevation of the youngest marine sedimentary layer of the MMCO strata approximates the sea level at the MMCO. The current elevation was reconstructed by adding the amount of denudation from the MMCO to the current elevation of the denuded MMCO strata at the outcrops, considering isostatic compensation. The amount of denudation since the MMCO period was estimated to be 180 m based on the global average denudation rate (Willenbring et al., 2013), and the estimated isostatic rebound was 153 m. By comparing the current, albeit virtual, elevation of the youngest marine sedimentary layer in the MMCO strata with sea level at the MMCO, the amount of uplift was estimated. For the MMCO sea level, a 66 m ice-free line was adopted. This method was applied to the Kibi Plateau in Southwest Japan, where the MMCO strata are distributed. The reliability of the denudation amount of 180 m for the MMCO strata was confirmed by paleo-water depths estimated using benthic foraminifera and mollusk fossils. The largest uplift of 504 ± 27 m occurred at the Jinseki-Kogen since 15 Ma. A positive correlation was observed between the amount of uplift and the current altitude of the Kibi Plateau. The Kibi Plateau's topography most likely evolved after the MMCO. It is concluded that a new perspective on estimating the uplift was obtained by taking denudation into account.

根据中新世气候最适宜期地层的当前高程估算隆升量:日本西南部木部高原案例研究
中新世气候最适宜期(MMCO)在约 15 Ma 时在大陆和岛弧上形成了浅海地层,部分 MMCO 地层后来经历了隆起。隆升量与 MMCO 时期之后的海平面上升相吻合,但无法观测到古海平面。本研究采用演绎法估算隆升量。MMCO地层中最年轻的海洋沉积层的海拔高度近似于MMCO时期的海平面。在考虑等静力补偿的情况下,通过将 MMCO 的剥蚀量与露头处剥蚀的 MMCO 地层的当前海拔高度相加,重建当前海拔高度。根据全球平均剥蚀率(Willenbring 等人,2013 年),自 MMCO 时期以来的剥蚀量估计为 180 米,等静力回升估计为 153 米。通过比较 MMCO 地层中最年轻海洋沉积层的当前海拔(尽管是虚拟海拔)与 MMCO 海平面,可以估计出隆起量。对于 MMCO 的海平面,采用了 66 米的无冰线。这种方法适用于 MMCO 地层分布的日本西南部的木部高原。利用底栖有孔虫和软体动物化石估算的古水深证实了 MMCO 地层 180 米剥蚀量的可靠性。自 15 Ma 以来,神崎高原发生了 504 ± 27 m 的最大隆起。据观察,隆升量与木部高原目前的海拔高度呈正相关。木部高原的地形很可能是在 MMCO 之后演化形成的。结论是,考虑到剥蚀作用,可以从一个新的角度来估算隆升。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Island Arc
Island Arc 地学-地球科学综合
CiteScore
2.90
自引率
26.70%
发文量
32
审稿时长
>12 weeks
期刊介绍: Island Arc is the official journal of the Geological Society of Japan. This journal focuses on the structure, dynamics and evolution of convergent plate boundaries, including trenches, volcanic arcs, subducting plates, and both accretionary and collisional orogens in modern and ancient settings. The Journal also opens to other key geological processes and features of broad interest such as oceanic basins, mid-ocean ridges, hot spots, continental cratons, and their surfaces and roots. Papers that discuss the interaction between solid earth, atmosphere, and bodies of water are also welcome. Articles of immediate importance to other researchers, either by virtue of their new data, results or ideas are given priority publication. Island Arc publishes peer-reviewed articles and reviews. Original scientific articles, of a maximum length of 15 printed pages, are published promptly with a standard publication time from submission of 3 months. All articles are peer reviewed by at least two research experts in the field of the submitted paper.
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