Late Holocene Landform Development and Change of Depositional Areas of Fluvial Sediment in the Central Echigo Plain, Central Japan

Ono, Eisuke; Ohira, Akio; Tanaka, Kazunori; Suzuki, I.; Yoshida, Kunio

doi:10.4116/jaqua.45.1

The Quat. Res.

2006

DOI: 10.4116/jaqua.45.1

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Late Holocene Landform Development and Change of Depositional Areas of Fluvial Sediment in the Central Echigo Plain, Central Japan

Eisuke Ono¹,

Akio Ohira²,

Kazunori Tanaka³

et al.

Abstract: Q̳QῩ̳ῠQΰ῞ῡῌ ῝Ύ̱Qῧ̯̮̯ῳῧῨ´`QῺQ̱῞ῌ Q῎ΐQQῦ̮Ὶ `̳ῖQQ̱Qῧ̯̮QῧQ ΰῨQ῾ῦQ῭ῖῦ῞̯῍ ̱Ῠ´ῢῨῸ̳̳῏QῦῷQῗQ ῝ῌ 15ῑ05 yrs BP ῦῨQ ̳ῦ̰ῢ̳ῒῧ῾QῗQῲ̯῍ Ὸ̳̳῏Q̰QῸQῌ ῷQῨ QQΰQῤQ΅Q῞ῥῗ῭ῌ Q̲ῖῧQQ̱QῦῬ̯ῡQ῎ῦQ̮῝̯῍ ̱Qῧ̯̮QῧῩ ῍Ῠῌ Q῎ΐQQ̰῟ῡ̳̯ῦΏQ̯`QQῗ̲̰῭ῌ .5* yrs BP ῸQῦῨQ̳̳ῦ̮Ὶ `̱QῧῙQ ΎQQῧQῗQῩ`ῦ῏Q῞̯῍ ̲Qῌ ̯̮QῧῩ῍ῖ῭Q̯ῷQ̯ῧ QQῦ̮̮ῡῨῌ ̱Qῧῑ̰`ῥ̯̮ῗQ῎ῦ῏Q῞ῌ ̯ῧ̳῭ῦ̮̮ῡῨ̳ῖῧQῒῦῬ`̱ Qῧ̯̮ῗQῥ̮ +5.ῑ+5* yrs BP ῧ ῷῬQ ΰῌ ̱Qῧ̯̮ῗQ῾ ῞̯ +5ῑ2 yrs BP ῧ ̯̮Q ῗ̲̰῭̯῍ QQῌ ̮ῖΰῩ̲QῖῧQῧ QQῦ̰῭`QῚΎQQῧῤ Ῠῌ +5ῑ2** yrs BP ῦ̮῟̯̳ῖῧQῒῦῬ`̱Q̯̮ῧQ῾ ῦΰῪῥ̯ῡQ῝̯῍ ̮῎ῖ῎̮ : Ῑ̯̯ῌ ῗ῞̰̰ῌ ῤῠ̯ῌ ῤῠΰῩῌ ῦ῝̰… Show more

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Cited by 2 publications

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Accumulation of thick fluvial sediments in the Shinano River incised-valley fills: implications for sequence stratigraphy and alluvial architecture

Hori,

Tanabe,

Urabe

2023

Journal of Sedimentary Research

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The relationship between fluvial systems and base-level changes, controlled mainly by sea-level fluctuations and tectonic activity, on time scales of 103–104 years, is important for evaluating and improving nonmarine sequence stratigraphy and numerical and physical alluvial architecture models. However, there are not enough quantitative data available from field studies, especially for periods of rapid base-level rise. The Echigo Plain, Japan, is a fluvial–coastal lowland where the tidal range is very small and where a very deep valley was incised by the Shinano River during the latest Pleistocene. The depth of the incised valley near the shoreline, 160 m below mean sea level, is greater than the amount of sea-level fall during the Last Glacial Maximum (LGM) because of tectonic subsidence. We studied an approximately 100-m-long borehole sediment core obtained from the landward part of the plain, where thick fluvial deposits have accumulated since the LGM. Sediment facies, diatom assemblages, sulfur content, carbon to sulfur ratios, and radiocarbon age dates indicate that most of the core sediments were deposited in a fluvial environment during the past 12 kyr. Sediment accumulation rates were 10–15 m/kyr between 12 and 8 cal kyr BP, and relatively low (less than 5 m/kyr) subsequently, mainly because of glacio-eustatic sea-level rise. The timing of the reduction in the accumulation rate is one possible indicator of the position of the maximum-flooding surface in a sequence composed only of fluvial sediments. The presence of many thin layers of very fine to fine-grained sand (20–80 cm thick), interpreted as crevasse-splay deposits, that formed between 11 and 8 cal kyr BP, when the base level was rising rapidly, implies that crevasse-splay deposits are characteristic of aggrading fluvial sediments and the transgressive systems tract in nonmarine sequence stratigraphy. Tectonic subsidence at approximately 2 m/kyr has contributed markedly to the larger accumulation rate of fluvial sediments of the highstand systems tract on the Echigo Plain, compared with rates in other fluvial–coastal lowlands, since 5–6 cal kyr BP, when the eustatic sea-level rise had mostly ceased.

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Accumulation of thick fluvial sediments in the Shinano River incised-valley fills: implications for sequence stratigraphy and alluvial architecture

Hori,

Tanabe,

Urabe

2023

Journal of Sedimentary Research

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Late Holocene Geoenvironmental Changes around Lake Koyama- Tottori Plain, Western Japan

Sato¹,

Ono

2013

Geographical review of Japan series A

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Late Holocene Landform Development and Change of Depositional Areas of Fluvial Sediment in the Central Echigo Plain, Central Japan

Cited by 2 publications

References 12 publications

Accumulation of thick fluvial sediments in the Shinano River incised-valley fills: implications for sequence stratigraphy and alluvial architecture

Accumulation of thick fluvial sediments in the Shinano River incised-valley fills: implications for sequence stratigraphy and alluvial architecture

Late Holocene Geoenvironmental Changes around Lake Koyama- Tottori Plain, Western Japan

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