Depositional Ages, Sequence Stratigraphy and Transition Process of Forearc Setting From Paleogene Restricted Bay/Estuarine to Neogene Open-Marine Deltaic/Slope Systems in the Sanriku-Oki Forearc Basin, Northeast Japan

IF 2.8 2区 地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY
Basin Research Pub Date : 2025-07-03 DOI:10.1111/bre.70042
Osamu Takano, Takashi Tsuji, Yasuhiro Yamada, Akira Ijiri, Tsuyoshi Ishikawa, Masafumi Murayama, Yasuo Kondo, Fumio Inagaki
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引用次数: 0

Abstract

This paper aims to discuss the transition process of the forearc basin setting along the Northeast Japan arc, based on the results of strontium isotope dating, resistivity image facies analysis, sequence stratigraphic and depositional system interpretation, and seismic facies mapping, mainly using the Site C0020 succession data of the Integrated Ocean Drilling Program (IODP) Expedition 337, off Shimokita Peninsula and surrounding seismic sections. The detailed correlations and strontium isotope ages constrain the geologic ages of Units II, III and IV of the Site C0020 succession as Eocene to Early Miocene. Cores and resistivity image logs show that Units II, III and IV consist of five facies associations, indicating bay, estuarine to fluvial, delta and muddy slope systems and eleven depositional sequences. Plot mapping of these facies associations and seismic facies indicates the drastic changes of the forearc basin setting through four tectonic phases from Eocene to Miocene. During Phase 1 (Eocene to Early Oligocene: Unit IV), the bay-to-estuarine system was dominant within a restricted forearc basin by a subaerially uplifted trench slope break. Phase 2 (Early to Late Oligocene: Unit III and the lowermost Unit II) was characterised by further uplift and erosion of the trench slope break, which formed three Oligocene unconformities: Ounc1, Ounc2 and Ounc3. During Phase 3 (Late Oligocene to Early Miocene: Unit II), a large-scale subsidence of the trench slope break started, possibly related to the onset of tectonic erosion of the subducting plate, and the forearc basin became an open-marine setting with a prograding delta system. After the formation of Miocene unconformity (Munc), Phase 4 (Middle Miocene-: Unit I) caused the cessation of the delta system, and the forearc basin became a muddy deep-water slope system, possibly resulting from the continent-derived sediment supply decrease due to the backarc opening of the Sea of Japan.

Abstract Image

日本东北三陆- oki前弧盆地古近系局限湾/河口向新近系开阔海相三角洲/斜坡体系的沉积时代、层序地层学及前弧背景过渡过程
基于锶同位素定年、电阻率图像相分析、层序地层学和沉积体系解释、地震相填图等研究成果,主要利用日本综合海洋钻探计划(IODP) 337考察队C0020站点的下基塔半岛及周边地震剖面资料,探讨了日本东北弧前盆地背景的转变过程。详细的对比和锶同位素年龄限制了C0020遗址ⅱ、ⅲ和ⅳ单元的地质年龄为始新世至早中新世。岩心和电阻率成像测井结果表明,单元II、III和IV由5个相组合组成,分别代表海湾、河口至河流、三角洲和泥质斜坡体系和11个沉积层序。这些相组合和地震相的样图填图显示了始新世至中新世四个构造阶段弧前盆地环境的剧烈变化。第1期(始新世—早渐新世第4单元),在一个由海底隆起的海沟坡折形成的有限弧前盆地内,以海湾—河口体系为主。第2阶段(早至晚渐新世:第III单元和最下层的第II单元)以沟坡折进一步隆升和侵蚀为特征,形成了3个渐新世不整合面:Ounc1、Ounc2和Ounc3。第3阶段(晚渐新世—早中新世:第2单元),可能与俯冲板块的构造侵蚀开始有关,开始了大规模的海沟坡折沉降,弧前盆地成为具有进动三角洲体系的开阔海相环境。中新世不整合(Munc)形成后,第4期(中中新世-第1单元)导致三角洲体系停止,弧前盆地成为泥质深水斜坡体系,这可能是由于日本海弧后开闭导致陆源沉积物供应减少所致。
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来源期刊
Basin Research
Basin Research 地学-地球科学综合
CiteScore
7.00
自引率
9.40%
发文量
88
审稿时长
>12 weeks
期刊介绍: Basin Research is an international journal which aims to publish original, high impact research papers on sedimentary basin systems. We view integrated, interdisciplinary research as being essential for the advancement of the subject area; therefore, we do not seek manuscripts focused purely on sedimentology, structural geology, or geophysics that have a natural home in specialist journals. Rather, we seek manuscripts that treat sedimentary basins as multi-component systems that require a multi-faceted approach to advance our understanding of their development. During deposition and subsidence we are concerned with large-scale geodynamic processes, heat flow, fluid flow, strain distribution, seismic and sequence stratigraphy, modelling, burial and inversion histories. In addition, we view the development of the source area, in terms of drainage networks, climate, erosion, denudation and sediment routing systems as vital to sedimentary basin systems. The underpinning requirement is that a contribution should be of interest to earth scientists of more than one discipline.
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