+ Site Statistics
References:
54,258,434
Abstracts:
29,560,870
PMIDs:
28,072,757
+ Search Articles
+ PDF Full Text Service
How our service works
Request PDF Full Text
+ Follow Us
Follow on Facebook
Follow on Twitter
Follow on LinkedIn
+ Subscribe to Site Feeds
Most Shared
PDF Full Text
+ Translate
+ Recently Requested

The landform evolution of late pleistocene in the miyazaki plain south kyushu japan



The landform evolution of late pleistocene in the miyazaki plain south kyushu japan



Quaternary Research 25(3): 139-164



The Miyazaki Plain has the best-developed late Quaternary terraces and deposits in Kyushu. But the landform evolution of this plain has not been investigated in detail in previous works. This study tephrochronologically describes the landform evolution in late Pleistocene. Thick weathered tephra layers overlying the terrace surfaces are subdivided into an older and a younger groups. The younger tephra group, which has been deposited in the last ca. 100,000 years, contains many marker tephra layers, in ascending order, Ata, K-Tz, FkP and Aso4 of 90,000-70,000 y.B.P.; AyP, IwtP, IwP, AwS, HnS II and OtP of 60,000-30,000 y.B.P.; OsP, ItoPfl, AT and KbP of 22,000-15,000 y.B.P.; and Ah of 6,000 y.B.P. The older tephra group covers the higher terrace group of middle Pleistocene. The younger group covers the following lower terrace surfaces, in descending order: the Sanzaibaru surface, the Karasebaru surface, the Nyutabaru I, II, III surfaces, the Saitobaru I, II surfaces, the Toyobaru I, II surfaces, the Oyodo surface, the Kunitomi I, II surfaces, the Mikazukibaru I, II surfaces, and the Holocene terrace surface group. Of many terrace surfaces in the Miyazaki Plain, the Sanzaibaru surface is the most extensive one. It is mostly of marine origin, composed of thick transgressive deposits called the Sanzaibaru Formation and lithologically subdivided into three members. The lower member is fluvial graveolous deposit in the regressive stage. The middle member consists of alternating beds of sand and silt with fossils of molluscs that lived in the embayment of a warm sea in the transgressive stage. The upper member is sandy deposit of deltaic and beach conditions in the maximum stage of the transgression. On the Sanzaibaru surface, the upper member forms sand ridges which are inferred to have been bars, barriers and dunes. The oldest marker tephra layer on the Sanzaibaru surface is the Ata ash which erupted from the Ata caldera ca. 90,000-80,000 y.B.P. The Sanzaibaru surface underlying the Ata ash is thought to have emerged ca. 100,000y.B.P., in the Last Interglacial Stage. It is estimated by subtracting the height of the base of the Sanzaibaru Formation from the height of the shoreline of the surface that sea level rose more than 100 m in the Sanzaibaru stage. The Nyutabaru I, II, III surfaces are characterized by gentle gradients and wide distribution. They are of fluvial origin, although the Nyutabaru II and probably III surfaces are partly of marine origin in the northern part of the plain. The Nyutabaru III surface is an accumulation terrace formed during the little transgression. These surfaces are thought to have emerged ca. 90,000-60,000 y.B.P., when a relatively high sea level was maintained because regression was slow and debris supply from the Kyushu Mountains increased or discharge in rivers decreased. The Saitobaru I and II, Ovodo, and Kunitomi I and II surfaces, which are characterized by steeper and more linear longitudinal profiles, are erosional terraces and are mostly of fluvial origin. Their surfaces came out ca. 50,000-10,000 y.B.P., in the Last Glacial Stage, when rapid regression occurred and sea level stayed relatively lower. The discharge of the rivers tended to increase gradually. The Karasebaru, Toyobaru I and II and Mikazukibaru I and II surfaces in the northern part of the plain are fluvial fans: They were formed in three regressional stages; the late Last Interglacial Stage, the early Last Glacial Stage and the late last glacial stage. These fans were formed under conditions in which the river bed gradient was steeper than that of the continental shelf when the sea level went down. The glacial eustacy has strongly affected the formation of each terrace in the Miyazaki Plain during late Quaternary as uplifting of the plain has continued. The discharge of each river conspicuously decreased ca. 90,000-60,000 y.B.P., and a large quantity of sand and gravel was deposied in the Miyazaki Plain.

Please choose payment method:






(PDF emailed within 1 workday: $29.90)

Accession: 006708934

Download citation: RISBibTeXText


Related references

Landform evolution of the upper Pleistocene in the Miyazaki Plain, southern Kyushu, Japan. Daiyonki Kenkyu = Quaternary Research: , Pages 139-163. 1986., 1986

Late Pleistocene tephrochronology in the region from the Osumi Peninsula to the Miyazaki Plain, South Kyushu, Japan. Chigaku Zasshi = Journal of Geography 93(6, (865)): 1-24, 1984

Late pleistocene tephrochronology in the region from the Osumi Peninsula to the Miyazaki Plain in South Kyushu, Japan. Journal of Geography 93(6): 347-370, 1984

Late Pleistocene and recent crustal movement in Miyazaki Plain, Kyushu. Chishitsu Chosajo Geppo = Bulletin - Japan, Geological Survey 40(12): 655-659, 1989

Heavy metals deficiency and distribution in soils of the Miyazaki Coastal Plain Terrace, South Kyushu, Japan. Bulletin of the Faculty of Agriculture, Miyazaki University 41(1): 25-30, 1994

Stratigraphic relation of the reddish soils on the pre-Chausubaru Terrace and the hilly land in the Miyazaki coastal plain, south Kyushu, Japan. Bulletin of the Faculty of Agriculture, Miyazaki University 41(1): 15-23, 1994

Integrated magnetobiochronology of the Pliocene-Pleistocene Miyazaki succession, southern Kyushu, southwest Japan; implications for an early Pleistocene hiatus and defining the base of the Gelasian; P/P boundary type section in Japan. Journal of Asian Earth Sciences 40.1, 2011

Sedimentary environments from late Pleistocene to Holocene in Kumamoto Plain in central Kyushu, Japan. International Geological Congress, Abstracts = Congres Geologique International, Resumes 31(2000, 2000

Some Problems on the Geomorphic Development in the Miyazaki Plain, South-eastern Kyushu. Daiyonki-Kenkyu = Quaternary Research 10(3): 99-109, 1971

Foraminifera from the shiroyama formation late pleistocene in kogashima city south kyushu japan. Reports of the Faculty of Science Kagoshima University (Earth Sciences and Biology) (8): 33-61, 1975

Middle to late Holocene delta plain evolution of the Kimotsuki lowland, Kyushu (southern Japan). Palaeogeography, Palaeoclimatology, Palaeoecology 502: 74-85, 2018

The Pliocene/Pleistocene boundary of the upper Takanabe Formation of the Miyazaki Group, southern Kyushu, Southwest Japan. Journal of the Geological Society of Japan 118(2): I-Ii, 2012

Stratigraphy of the miyazaki group in the southeastern part of miyazaki prefecture kyushu japan. Contributions from the Institute of Geology & Paleontology Tohoku University (90): 1-24, 1987

On the stratigraphic and structural relationship between the Miyazaki and the Aoshima facies of the upper Neogene Miyazaki Group, Kyushu, Japan. Reports Of The Faculty Of Science Kagoshima University (earth Sciences & Biology). 0(26): 67-84, 1993

Pliocene/Pleistocene boundary and paleoceanographic significance of the upper Miyazaki Group, southern Kyushu, Southwest Japan, based on calcareous nannofossila nd planktic foraminiferal; assemblages. Journal of the Geological Society of Japan 118.2, 2012