日本长崎县中新世下-中后户群地层重建

IF 1 4区 地球科学 Q4 GEOSCIENCES, MULTIDISCIPLINARY
Island Arc Pub Date : 2022-08-12 DOI:10.1111/iar.12456
Shoichi Kiyokawa, Masaru Yasunaga, Takanori Hasegawa, Ayako Yamamoto, Daisaku Kaneko, Yuta Ikebata, Noriko Hasebe, Yukiyasu Tsutsumi, Mami Takehara, Kenji Horie
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引用次数: 2

摘要

后藤群岛位于日本列岛的最西端,保存着大陆边缘裂谷和日本海打开时期中新世中下沉积序列。利用后户群地层和新的K-Ar、裂变径迹和U-Pb年龄资料,确定了日本西南部裂陷的初始条件。后藤群的厚度为2000-3000米。下部单元(约22-17.6 Ma)由厚的、带绿色的火山碎屑岩和玄武质火山物质组成,代表了大陆裂陷的初始阶段。中间单元(约17.6 Ma)由火山活动时期同裂谷沉积盆地湖盆和曲流环境中沉积的砂岩和页岩组成。上部单元(约17.6-16.8 Ma)由河流-三角洲相的厚砂岩组成,这些砂岩是在大陆边缘快速沉降期间沉积的。这个单元是由流入日本海的大型河流系统沉积而成的。这些序列包含相对较冷至较暖的植物区系(daijima型),记录了中新世气候最适宜期的温暖期。后藤长英质火山岩(16.8 ~ 15.4 Ma)不整合覆于后藤群之上,花岗质岩浆作用(约16 ~ 14.5 Ma)发生于后藤群沉积后。在欧亚大陆东部边缘的火山弧裂陷的早期,迅速的沉降形成了一个地堑盆地,形成了广泛的湖泊、蜿蜒的辫状河流、庞大的后藤群三角洲体系和长英质火山作用。这些事件发生在日本海形成之前和形成期间的22.0 ~ 16.8 Ma。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Stratigraphic reconstruction of the lower–middle Miocene Goto Group, Nagasaki Prefecture, Japan

Stratigraphic reconstruction of the lower–middle Miocene Goto Group, Nagasaki Prefecture, Japan

The Goto Islands are located at the westernmost tip of the Japan archipelago, and preserve a lower–middle Miocene sedimentary sequence deposited during rifting of the continental margin and opening of the Sea of Japan. The stratigraphy of the Goto Group and new K–Ar, fission-track, and U–Pb age data were used to determine the initial conditions of rifting in southwest Japan. The thickness of the Goto Group is 2000–3000 m. The lower unit (ca. 22–17.6 Ma) consists of thick, greenish, volcaniclastic rocks with basaltic volcanic material, representing the initial stages of continental rifting. The middle unit (ca. −17.6 Ma) consists of alternating sandstones and shales deposited in lacustrine and meandering fluvial environments in a syn-rift sedimentary basin during a period of volcanic activity. The upper unit (ca. 17.6–16.8 Ma) consists of thick sandstones of fluvial–deltaic facies that were deposited during rapid subsidence at the continental margin. This unit was deposited by a large fluvial system that flowed into the Sea of Japan. These sequences contain relatively cooler to warmer flora (Daijima-type) and record the warm period of the Miocene Climatic Optimum. The Goto felsic volcanic rocks (16.8 ~ 15.4 Ma) unconformably overlie the Goto Group, and granitic magmatism (ca. 16–14.5 Ma) occurred after sedimentation of the Goto Group. The widespread lacustrine, meandering–braided fluvial, and vast deltaic systems of the Goto Group, and felsic volcanism, were formed due to rapid subsidence that produced a horst-and-graben basin during the early stages of rifting of a volcanic arc along the eastern margin of Eurasia. These events occurred from 22.0 to 16.8 Ma before and during the formation of the Sea of Japan.

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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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