Sedimentation and Preservation of Organic Matter in an Estuary, Niigata Plain, Central Japan

Omura, Akiko; Hoyanagi, Koichi; Yoshida, Mamiko; Yamazaki, Azusa; Yamagishi, Miyuki; Urabe, Atsushi

doi:10.2110/pec.06.85.0099

Cited by 3 publications

(9 citation statements)

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“…The origins of NFA and WFA in Pleistocene to Miocene shelf and deep-sea deposits of Niigata and Akita prefectures, which are on the back-arc side of the Japanese archipelago are estimated to be terrestrial higher plants and marine plankton, respectively (Sawada and Akiyama, 1994;Omura and Hoyanagi, 2004). While, Omura et al (2006) analyzed stable carbon isotope of Pleistocene shelf sediments in a fore-arc setting and pointed out that NFA in this area is derived from both terrigenous and marine plankton. The composition of organic matter in each sample was determined by counting 300 points at intervals of 100 mm under transmitted and reflected fluorescent-light microscopy (working magnification 400x, 330 to 385 nm excitation filter, 420 nm absorption filter).…”

Section: Methodsmentioning

confidence: 99%

“…These studies were mainly conducted on siliciclastics (e.g., Hart et al, 1994;Tyson, 1996;Wood and Gorin, 1998;Omura and Hoyanagi, 2004;Pellaton and Gorin, 2005) and carbonates (e. g., Gorin and Steffen, 1991;Steffen and Gorin, 1993;Bombardiere and Gorin, 1998) deposited in shelf to deep-sea environments. On the other hand, several studies about organic-matter type and preservation have been conducted on estuary to delta deposits (e.g., Hart 1994;Pittet and Gorin, 1997;Carvalho et al, 2006;Omura et al, 2000Omura et al, , 2006Yoshida et al, 2006Yoshida et al, , 2007Yoshida et al, , 2009). However, the relationship between organicmatter preservation in estuary to fluvial deposits and sealevel changes has rarely been studied.…”

Section: Introductionmentioning

confidence: 99%

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High-resolution sequence stratigraphy in an incised-valley system on the basis of sedimentary organic matter, sulfur content and fossil diatom: An example from Miocene to Pliocene Tatsunokuchi Formation, Iwate Prefecture, Northeast Japan

Yoshida

Inoue

Hoyanagi

et al. 2011

Jour. Sed. Soc. Japan

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This paper discusses relationship among depositional environments, origin of the sedimentary organic matter and diatom fossil assemblage, combined with sequence stratigraphy in an incised-valley system. Interpretation of the environments and their changes was based on sedimentary facies, total sulfur (TS) content, and diatom assemblages. The quantity and composition of organic matter were estimated for the environmental interpretation on the basis of the total organic carbon (TOC) content, reflected-light fluorescent microscopy, and stable carbon isotope ratios of the organic matter (d 13 C org ). The Miocene to Pliocene Ishibane, Tatsunokuchi and Motohata formations in northeast Japan consist of estuarine and fluvial deposits that were formed during a rise and fall of sea level. The proportions of vitrinite and cutinite that are coarse-grained and terrestrial in origin are relatively high in fluvial deposits of the lowstand systems tract. The proportion of marine alginite, TOC content, and d 13 C org values increase upward in estuary deposits of the transgressive systems tract. This implies the increase in the influence of the sea and the estuarine bottom conditions becoming anoxic. The proportions of vitrinite and cutinite increase upward in the highstand systems tract, whereas the d 13 C org values and TOC content decrease upward. These reflect the strong influence of river discharge. Variations of diatom fossil assemblage of fresh water, brackish water, intertidal, coastal marine and open marine species indicate the same repetitions of transgression and regression in the Tatsunokuchi Formation. Therefore, the transgressive systems tract in the Tatsunokuchi Formation includes four cycles of transgression and regression, while highstand systems tract shows one cycle of transgression and regression.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

High-resolution sequence stratigraphy in an incised-valley system on the basis of sedimentary organic matter, sulfur content and fossil diatom: An example from Miocene to Pliocene Tatsunokuchi Formation, Iwate Prefecture, Northeast Japan

Yoshida

Inoue

Hoyanagi

et al. 2011

Jour. Sed. Soc. Japan

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“…(2006) showed that Holocene environmental and relative sea‐level changes are preserved in the lithology, sedimentary facies, total organic carbon (TOC) and total sulfur (TS) content of the KJSN core from the Niigata Plain. Omura et al. (2006) mentioned the relationship between organic‐matter composition and sequence stratigraphy in the same core.…”

Section: Introductionmentioning

confidence: 99%

“…The uppermost Pleistocene‐Holocene sediments in the KJSN core are about 45 m thick (Fig. 2), and composed of meandering‐river‐channel and flood‐plain, braided‐river‐channel, transgressive‐lag, bay‐head‐delta, tidal‐flat, lagoon, lake, braided‐river‐channel and flood‐plain sediments, in ascending order (Omura et al. 2006; Yoshida et al.…”

Section: Introductionmentioning

confidence: 99%

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Occurrence conditions of hyperpycnal flows, and their significance for organic‐matter sedimentation in a Holocene estuary, Niigata Plain, Central Japan

Yoshida¹,

Yoshiuchi

Hoyanagi

2009

Island Arc

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River floods influence sedimentary environments and ecosystems from the terrestrial to the deep-marine. This study documents the occurrence conditions of hyperpycnal flows generated by river floods and related organic-matter sedimentation for Holocene sediments of the Niigata Plain, Central Japan, based on detailed sedimentary facies, total sulfur and total organic carbon content, diatom assemblages and organic-matter composition. Holocene sediments of the Niigata Plain consist of sand, mud and gravel that were deposited in estuarine and fluvial systems during a sea-level rise (15 000-6800 years BP) and stillstand (after 6800 years BP) following the Last Glacial Maximum. Hyperpycnites are present in the upper part of the estuarine lagoon sediments. The depositional age is considered to be about 5000 years BP. The hyperpycnites comprise two successions of a top fining-up unit and a basal coarsening-up unit, and include abundant terrigenous organic matter and freshwater diatoms. A large volume of freshwater is inferred to have flowed into the lagoon during deposition of the upper part of the lagoon sediments. In consequence, hyperpycnal flows may have readily formed in the lagoon, because the halocline was weak. The hyperpycnal flows also produced a layer of concentrated terrigenous organic matter in the uppermost part of the hyperpycnites. The abundant organic matter on the estuarine floor is inferred to have produced anoxic bottom conditions owing to oxidative decomposition by benthic bacteria.iar_663 320..332

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One of the birthplaces of geology in Japan: Paleogene and Neogene strata in Yubari, Hokkaido, Japan

Hoyanagi

Kawakami

Miyasaka

2007

Jour. Geol. Soc. Japan

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Sedimentation and Preservation of Organic Matter in an Estuary, Niigata Plain, Central Japan

Cited by 3 publications

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High-resolution sequence stratigraphy in an incised-valley system on the basis of sedimentary organic matter, sulfur content and fossil diatom: An example from Miocene to Pliocene Tatsunokuchi Formation, Iwate Prefecture, Northeast Japan

High-resolution sequence stratigraphy in an incised-valley system on the basis of sedimentary organic matter, sulfur content and fossil diatom: An example from Miocene to Pliocene Tatsunokuchi Formation, Iwate Prefecture, Northeast Japan

Occurrence conditions of hyperpycnal flows, and their significance for organic‐matter sedimentation in a Holocene estuary, Niigata Plain, Central Japan

One of the birthplaces of geology in Japan: Paleogene and Neogene strata in Yubari, Hokkaido, Japan

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