scholarly journals Discovery and significance of middle Pleistocene tephra layers from Daisen Volcano in a boring core from the Kamiyoshi Basin, northwest of Kyoto, southwest Japan

2011 ◽  
Vol 50 (1) ◽  
pp. 35-48 ◽  
Author(s):  
Atsuo Kotaki ◽  
Shigehiro Katoh ◽  
Kanichi Kitan
Keyword(s):  
Middle Pleistocene ◽  
Southwest Japan ◽  
Tephra Layers

scholarly journals Discovery of an early Middle Pleistocene marker tephra around the Ariake Bay area, Southwest Japan

2012 ◽  
Vol 118 (11) ◽  
pp. 709-722 ◽  
Author(s):  
Shoichi Shimoyama ◽  
Hirohisa Matsuura ◽  
Kiyohide Mizuno ◽  
Masakazu Kubota ◽  
Takenori Hino ◽  
...  
Keyword(s):  
Middle Pleistocene ◽  
Ariake Bay ◽  
Southwest Japan ◽  
Bay Area

scholarly journals Tephrostratigraphy and tephrochronology of lakes Ohrid and Prespa, Balkans

2010 ◽  
Vol 7 (3) ◽  
pp. 3931-3967 ◽  
Author(s):  
R. Sulpizio ◽  
G. Zanchetta ◽  
M. D'Orazio ◽  
H. Vogel ◽  
B. Wagner
Keyword(s):  
Southern Italy ◽  
Mediterranean Area ◽  
Mount Etna ◽  
Middle Pleistocene ◽  
Tephra Layer ◽  
Lake Ohrid ◽  
Central Mediterranean ◽  
The Balkans ◽  
Tephra Layers ◽  
First Time

Abstract. Four cores from Balkans lakes Ohrid and Prespa were studied for recognition of tephra layers and cryptotephras, and the results presented along with the review of data from other two already published cores from Lake Ohrid. The six cores provide a previously unrealised tephrostratigraphic framework of the two lakes, and supply the first detailed tephrochronologic profile (composite) for the Balkans, which spans from the end of the Middle Pleistocene to the end of the Ancient Age (AD 472). A total of 12 tephra layers and cryptotephras were recognised in the cores. One is of Middle Pleistocene age (131 ky) and correlated to the marine tephra layer P-11 from Pantelleria Island. Eight volcanic layers are Upper Pleistocene in age, and encompass the period between ca. 107 ky and ca. 31 ky. This interval contains some of the main regional volcanic markers of the Central Mediterranean area, including X-6, X-5, Y-5 and Y-3 tephra layers. The other layers of this interval have been related to the marine tephra layers C20, Y-6 and C10, while one was for the first time recognised in distal areas and correlated to the Taurano eruption of probable Vesuvian origin. Three cryptotephras were of Holocene age. Two of which have been correlated to Mercato and AD 472 eruptions of Somma-Vesuvius, while the third has been correlated to the FL eruption from Mount Etna. These recognitions provide a link of the Ohrid and Prespa lacustrine successions to other archives of the Central Mediterranean area, like South Adriatic, Ionian, and South Tyrrhenian Seas, lakes of Southern Italy (Lago Grande di Monticchio, Pantano di San Gregorio Magno and Lago di Pergusa) and Balkans (Lake Shkodra).

Bed-thickness frequency distributions and recurrence intervals of sediment-gravity-flow deposits intercalated in lacustrine varved diatomite: examples from the middle Pleistocene Hiruzenbara Formation, southwest Japan

2020 ◽  
Vol 90 (6) ◽  
pp. 561-572
Author(s):  
Hana Sasaki ◽  
Yasunori Sasaki ◽  
Megumi Saito-Kato ◽  
Hajime Naruse ◽  
Yoshiro Ishihara
Keyword(s):  
Power Law ◽  
Slope Failure ◽  
Gravity Flow ◽  
Middle Pleistocene ◽  
Southwest Japan ◽  
Frequency Distributions ◽  
Base Section ◽  
Sediment Gravity Flow ◽  
Recurrence Intervals ◽  
Bed Thickness

ABSTRACT Bed-thickness frequency distributions of sediment-gravity-flow deposits, especially turbidites, are one of the major interests of sedimentology. Lognormal, power-law, exponential, and truncated normal distributions have all been proposed for their frequency distributions. Although these frequency distributions have been obtained from many field observations and estimated from statistical models, problems associated with the complexity of sedimentary processes have remained. In this study, bed-thickness frequency distributions and the recurrence intervals of sediment-gravity-flow deposits intercalated in the Pleistocene lacustrine varved diatomite in southwest Japan were analyzed. The results reveal that the bed thicknesses of sediment-gravity-flow deposits induced by different mechanisms show different types of frequency distribution. For example, flood-induced sediment-gravity-flow deposits show power-law-like distributions, whereas such deposits caused by lake-slope-failure show lognormal distributions. The suggestion is that flood-induced types are deposited from floods having a power-law scale. However, the bed thicknesses of the deposits induced by lake-slope-failure do not purely reflect the event scale, because the lateral variation of their thicknesses reflects the depositional processes. The recurrence intervals of both types of event show Poisson-like distributions except for lake-slope-failure deposits at the slope-base section. Despite observed ranges, the distributions of lake-slope-failure deposits at the slope-base section have a high amount of zero value and the recurrence interval show exponentially decreasing. These results suggest that both events were generated randomly, despite different origins. In addition, the incompleteness of the records was also suggested from sediment bypass of a lake-slope-failure event at the slope-base section.

scholarly journals Tephrostratigraphy and tephrochronology of lakes Ohrid and Prespa, Balkans

2010 ◽  
Vol 7 (10) ◽  
pp. 3273-3288 ◽  
Author(s):  
R. Sulpizio ◽  
G. Zanchetta ◽  
M. D'Orazio ◽  
H. Vogel ◽  
B. Wagner
Keyword(s):  
Southern Italy ◽  
Mediterranean Area ◽  
Mount Etna ◽  
Middle Pleistocene ◽  
Tephra Layer ◽  
Lake Ohrid ◽  
Central Mediterranean ◽  
The Balkans ◽  
Tephra Layers ◽  
First Time

Abstract. Four cores from Balkans lakes Ohrid and Prespa were examined for recognition of tephra layers and cryptotephras, and the results presented along with the review of data from other two already published cores from Lake Ohrid. The six cores provide a previously unrealised tephrostratigraphic framework of the two lakes, and provide a new tephrostratigraphic profile (composite) for the Balkans, which spans from the end of the Middle Pleistocene to the AD 472. A total of 12 tephra layers and cryptotephras were recognised in the cores. One is of Middle Pleistocene age (131 ka) and correlated to the marine tephra layer P-11 from Pantelleria Island. Eight volcanic layers are Upper Pleistocene in age, and encompass the period between ca. 107 ka and ca. 31 ka. This interval contains some of the main regional volcanic markers of the central Mediterranean area, including X-6, X-5, Y-5 and Y-3 tephra layers. The other layers of this interval have been related to the marine tephra layers C20, Y-6 and C10, while one was for the first time recognised in distal areas and correlated to the Taurano eruption of probable Vesuvian origin. Three cryptotephras were of Holocene age. Two of which have been correlated to Mercato and AD 472 eruptions of Somma-Vesuvius, while the third has been correlated to the FL eruption from Mount Etna. These recognitions provide a link of the Ohrid and Prespa lacustrine successions to other archives of the central Mediterranean area, like south Adriatic, Ionian, and south Tyrrhenian seas, lakes of southern Italy (Lago Grande di Monticchio, Pantano di San Gregorio Magno and Lago di Pergusa) and Balkans (Lake Shkodra).

The Montalbano Jonico marine succession: An archive for distal tephra layers at the Early–Middle Pleistocene boundary in southern Italy

2015 ◽  
Vol 383 ◽  
pp. 89-103 ◽  
Author(s):  
P. Petrosino ◽  
B.R. Jicha ◽  
F.C. Mazzeo ◽  
N. Ciaranfi ◽  
A. Girone ◽  
...  
Keyword(s):  
Southern Italy ◽  
Middle Pleistocene ◽  
Tephra Layers
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