The Formation of Late Pleistocene and Holocene Sand Dunes on Kikaijima Island, Nansei Islands

IF 0.2 Q4 GEOGRAPHY, PHYSICAL
H. Moriwaki, Toshiro Nagasako, Takehiko Suzuki, S. Terayama, Jun Matsukaze, Ryuhei Oda
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引用次数: 0

Abstract

― 683 ― Abstract Coastal sand dunes dating to the latter part of the late Pleistocene were constructed at sub-stantially lower sea levels on Kikaijima Island. They are preserved because of large-magnitude uplifts ascertained from occurrences of outstanding late Pleistocene and Holocene coral terraces. In addition, because Holocene sand dunes occur close to those of Marine Oxygen Isotope Stage 3 ( MIS 3 ) , the island is ideal for examining the environments of the formation of sand dunes, which were constructed under different climatic and sea-level conditions. Distributional and depositional features of sand dunes are clarified, and their chronology is constructed on the basis of tephrochronology, 14 C dating, and chronological relationships of the sand dunes with marine terraces of known age. The environments of sand-dune formation on Kikaijima are examined in relation to climatic and sea-level records within regional and global contexts. Nine tephra layers are recognized. These include two widespread tephras, Kikai-Akahoya tephra ( K-Ah ) and Aira-Tn tephra ( AT ) . The other seven tephras, consisting of fine ash layers, are newly recognized and named Kikaijima-1 tephra ( Kj-1 ) to Kikaijima-7 tephra ( Kj-7 ) , of which the upper six, lying between K-Ah and AT, are aged from 13,000 to 30,000 cal BP. Holocene sand dunes began to form at c . 8,000 cal BP before the culmination Island is mainly related to the occurrence of coastal sandy beaches during sea-level high stands. Although Holocene sand dunes are related to Holocene high stand, those of MIS 3 are related to high stands during cycles of sea-level fluctuations in MIS 3. The longitudinal landform of the sand dunes recognized in the late MIS 3 suggests that the prevailing winds in MIS 3 were stronger than in the Holocene. This study provides critical data for constructing a chronological framework that integrates various aspects of palaeoenvironments, as well as human interactions and responses in southern Kyushu.
南濑群岛菊岛晚更新世和全新世沙丘的形成
Kikaijima岛的海岸沙丘可追溯至晚更新世后期,形成于海平面较低的地方。它们被保存下来的原因是,从突出的晚更新世和全新世珊瑚梯田的出现中确定了大规模的隆起。此外,由于全新世沙丘的形成与海洋氧同位素阶段3 (MIS 3)的沙丘非常接近,因此该岛是研究不同气候和海平面条件下沙丘形成环境的理想场所。阐明了沙丘的分布和沉积特征,并在地表年代学、14c测年以及沙丘与已知年龄的海相阶地的年代学关系的基础上构建了沙丘的年代学。在气候和海平面记录的区域和全球背景下,研究了菊岛沙丘形成的环境。识别出了9个tephra层。这些包括两种广泛分布的tephra, Kikai-Akahoya tephra (K-Ah)和Aira-Tn tephra (AT)。其余7个由细灰分层组成的岩带为新发现的岩带,命名为Kikaijima-1 ~ Kikaijima-7岩带(Kj-7),其中位于K-Ah ~ AT之间的上部6个岩带年龄在13000 ~ 30000 cal BP之间。全新世沙丘开始形成于c。中天岛前8000 cal BP主要与海平面高架时期海岸沙滩的出现有关。全新世沙丘与全新世高海拔有关,而MIS 3的沙丘与MIS 3海平面波动周期中的高海拔有关。第三期晚期沙丘的纵向地貌特征表明,第三期的盛行风比全新世强。该研究为构建一个整合九州南部古环境各个方面以及人类相互作用和反应的时间框架提供了关键数据。
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
CiteScore
1.50
自引率
33.30%
发文量
28
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