Geometry and lithofacies of coarse-grained injectites and extrudites in a late Pliocene trench-slope basin on the southern Boso Peninsula, Japan

Itô, Makoto; Ishimoto, Sakumi; Ito, Kento; Kotake, Nobuhiro

doi:10.1016/j.sedgeo.2016.02.015

Cited by 10 publications

(7 citation statements)

References 69 publications

(111 reference statements)

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“…A less detailed stratigraphic log was documented from a river cut 4.5 km up section (Figure 3A,B; Location 1 in Ito, 2008) to compare changes within packages; no samples were taken at this location. Logged sections record information on the lithology, grain size, sedimentary F I G U R E 1 (A) Geological map of the Boso Peninsula, Japan and adjacent areas (Modified from Ito et al, 2016). Inset map shows a modern plate tectonic framework of the Boso Peninsula.…”

Section: Methodsmentioning

confidence: 99%

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Channel‐lobe transition zone development in tectonically active settings: Implications for hybrid bed development

Brooks

Itô

Zuchuat

et al. 2022

The Depositional Record

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Channel‐lobe transition zones are dynamic areas located between deepwater channels and lobes. Presented here is a rare example of an exhumed channel‐lobe transition zone from an active‐margin setting, in the Kazusa forearc Basin, Boso Peninsula, Japan. This Plio‐Pleistocene outcrop exposes a thick (tens of metres) channel‐lobe transition zone succession with excellent dating control, in contrast to existing poorly dated studies of thinner (metres) deposits in tectonically quiescent settings. This high‐resolution outcrop permits the roles of climate and associated relative sea‐level changes on stratigraphic architecture to be assessed. Three development stages are recognised with an overall coarsening‐upward then fining‐upwards trend. Each stage is interpreted to record one obliquity‐driven glacioeustatic sea‐level fall‐then‐rise cycle, based on comparison with published data. Deposition of the thickest and coarsest strata, Stage 2, is interpreted to record the end of a period of relative sea‐level fall. The thinner and finer strata of Stages 1 and 3 formed during interglacial periods where the stronger Kuroshio Oceanic Current, coupled to increased monsoonally driven tropical cyclone frequency and intensity, likely resulted in inhibited downslope sediment transfer. A key aspect of channel‐lobe transition zone deposits in this case is the presence of a diverse range of hybrid beds, in contrast to previous work where they have primarily been associated with lobe fringes. Here hybrid bed characteristics, and grain‐size variations, are used to assess the relative importance of longitudinal and vertical segregation processes, and compared to existing models. Compared to channel‐lobe transition zones in tectonically quiescent basin‐fills, this channel‐lobe transition zone shows less evidence of bypassing flows (i.e. thicker stratigraphy, more isolated scour‐fills, fewer bypass lags) and has significantly more hybrid beds. These features may be common in active basin channel‐lobe transition zones due to: high subsidence rates; high sedimentation rates; and disequilibrium of tectonically active slopes. This disequilibrium could rejuvenate erodible mud‐rich substrate, leading to mud‐rich flows arriving at the channel‐lobe transition zone, and decelerating rapidly, forming hybrid beds.

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Section: Methodsmentioning

confidence: 99%

“…(A) Geological map of the Boso Peninsula, Japan and adjacent areas (Modified from Ito et al, 2016). Inset map shows a modern plate tectonic framework of the Boso Peninsula.…”

Section: Geological Settingmentioning

confidence: 99%

Channel‐lobe transition zone development in tectonically active settings: Implications for hybrid bed development

Brooks

Itô

Zuchuat

et al. 2022

The Depositional Record

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“…There are several places where natural gas spontaneously springs up (Supplementary movie S1). It is therefore possible that modern carbon is supplied to the deep aquifer along tectonic faults and the forearc basin (Figure a). , DOM and methane originate from primary producers buried in the accretionary prism, but the relative contributions of modern carbon and organic compounds in Cenozoic sediments to the huge methane production are poorly understood so far. Furthermore, the brine-rich water also contains a high concentration of iodine (<1.2 mM), which is approximately two thousand times than that of modern seawater (0.5 μM).…”

Section: Introductionmentioning

confidence: 99%

“…We collected a gas phase, brine-rich water, and bubbled scum from gas production wells KTG3 and KTG4 in the Southern 74 The geological profiles showing Holocene sediment and forearc basin deposits associated with the Shimosa, Kazusa, and Miura groups are modified after a previous study. 75 The Southern Kanto gas field has many unique features, including high-purity methane and high concentrations of iodine and DOM. The field contains a large amount of methane, with recoverable reserves of approximately 3.6 × 10 11 m 3 .…”

Section: ■ Introductionmentioning

confidence: 99%

Origin of Deep Methane Associated with a Unique Community of Microorganisms in an Organic- and Iodine-Rich Aquifer

Urai

Takano

Imachi

et al. 2021

ACS Earth Space Chem.

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We performed coenzyme factor 430 (F430) analysis and radiocarbon measurements to identify deep microorganisms, including methanogenic archaea, and assess the origin of methane in a deep organic-and iodine-rich aquifer in a forearc basin at the Southern Kanto gas field, Boso Peninsula, Japan. We detected high concentrations of native F430 (approximately 1.67 × 10 4 femto mol L −1 ) in the absence of the F430 epimer. Both lipid and small-subunit rRNA gene analyses indicated that the biomass of domain archaea was less than 10% of the total prokaryotes, while methanogenic archaea (e.g., Methanomicrobia) was detected in the rRNA sequences. These results strongly suggest high active methanogenesis potential mediated by the subsurface microbes. A stable carbon isotope ratio of methane (δ 13 C methane , −67.9 to −71.4‰ vs Vienna Pee Dee Belemnite) and a huge reservoir of high-purity methane (>99%) indicated a typical biogenic origin. Radiocarbon measurements of methane and dissolved inorganic carbon (DIC) revealed 14 C-depleted (both Δ 14 C methane and Δ 14 C DIC , <−997.4‰), suggesting that the entire deep habitat and methanogenesis represents an isolated subterranean microbial ecosystem.

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“…They were first found in the vicinity of St. Petersburg [Srtangways, 1821] and later in the east of Argentina [Darwin, 1846], and since then, for almost 200 years, specialists have been describing these structures, arguing about their origins and trying to use the clastic dikes for unraveling the secrets of the geological record [Newsom, 1903;Borchardt, Mace, 1992;Larsen, Mangerud, 1992;Sims, Garvin, 1995;Obermeier, 1996Obermeier, , 1998Vanneste et al, 1999;Obermeier et al, 2005;Bezerra et al, 2001;Jolly, Lonergan, 2002;Jonk et al, 2003;van Vliet-Lanoë et. al., 2004;Castilla, Audemard, 2007;Porat et al, 2007;Goździk, van Loon, 2007;Moretti, Sabato, 2007;Levi et al, 2006Levi et al, , 2009Levi et al, , 2011Chen et al, 2009;Deev et al, 2009Deev et al, , 2015Rusakov, Nikonov, 2010;Rogozhin, 2012;Talwani et al, 2011;van Loon, Maulik, 2011;Cooley, 2011;Novikov et al, 2013;Quigley et al, 2013;Jacoby et al, 2015;Hargitai, Levi, 2015;Ito et al, 2016;Rodríguez-Pascua et al, 2016;Onorato et al, 2016]. During years of research, it became apparent that the genesis of clastic dikes is multifarious Shanmugan, 2016…”

Section: Introductionmentioning

confidence: 99%

An Overview of Clastic Dikes: Significance for Earthquake Study

Лунина

2019

Geodin. tektonofiz.

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Clastic dikes are often the only evidence of past disasters in poorly exposed areas and therefore their findings are extremely important for earthquake study. However, the variety of their origins greatly complicates the use of clastic dikes to assess the seismic hazards within the manifold environments. This paper systematizes main triggers, formation mechanisms and some matching indicative features of tabular and cylindrical bodies with an emphasis on the importance of revealing the injection dikes formed by fluidized injection of clastic material into the host sedimentary layers (from the bottom upwards) and associated with overpressure buildup and hydraulic fracturing. Based on the revision of known seismic liquefaction features and specific descriptions of the injection dikes, this overview defines 12 general and 12 individual geological and structural criteria (for study in sectional view), which make it possible to establish confidently the earthquake origin of the dikes caused by fluidization from seismic liquefaction. In addition, ground penetrating radar data correlating with trenching suggest indicative searching criteria of the injection dikes on radargrams, namely: a pipe‐shaped anomaly or a composite anomaly combining a tubular form in the lower part with an isometric – in the upper [i]; relatively high values of unipolar positive echoes on the trace of GPR signal [ii]; an occurrence of the same anomaly on adjacent parallel profiles located the first tens of meters apart [iii]; and stratigraphic disruptions of the radar events on the background of their continuous horizontal position [iv]. Finally, the paper illustrates that the clastic dikes can be successfully applied to determine the age and the recurrence interval, the epicenter location and a lower‐bound magnitude/intensity of paleoearthquakes, thus providing geological data for seismic hazard assessments in the regions, in which unconsolidated deposits capable to liquefaction are common.

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Geometry and lithofacies of coarse-grained injectites and extrudites in a late Pliocene trench-slope basin on the southern Boso Peninsula, Japan

Cited by 10 publications

References 69 publications

Channel‐lobe transition zone development in tectonically active settings: Implications for hybrid bed development

Channel‐lobe transition zone development in tectonically active settings: Implications for hybrid bed development

Origin of Deep Methane Associated with a Unique Community of Microorganisms in an Organic- and Iodine-Rich Aquifer

An Overview of Clastic Dikes: Significance for Earthquake Study

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