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Paleogene and Plio-Pleistocene basin formation around northwestern Kyushu, Japan (1999)

Itoh, Yasuto ; Matsuoka, Kazumi ; Takemura, Keiji

Melbourne, Australia : Blackwell Science Pty

The @island arc 8 (1999), S. 0

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ISSN: 1440-1738

Source: Blackwell Publishing Journal Backfiles 1879-2005

Topics: Geosciences

Notes: Cenozoic basin-forming processes in northwestern Kyushu were studied on the basis of geological and geophysical data. Gravity anomaly analysis delineated four sedimentary basins in the study area: Goto-nada, Nishisonogi, Amakusa-nada, and Shimabara. Borehole stratigraphy and reflection seismic interpretation suggest that the Goto-nada Basin was subdivided into the Paleogene and Plio-Pleistocene depocenters (Goto-nada 1 and 2). In the Paleogene, Amakusa-nada Basin was rapidly subsiding together with the Shimabara Basin as part of a large graben. Goto-nada 1 and Nishisonogi basins belonged to another depositional area. After stagnant subsidence stage in the early Miocene, the study area became a site of basaltic activity (since 10 Ma) and vigorous subsidence in the Plio-Pleistocene. Goto-nada 2 Basin is accompanied with numerous east–west active faults, and separated from the Amakusa-nada Basin by a northeast– southwest basement high, Nomo Ridge. Plio-Pleistocene subsidence of the Amakusa-nada Basin is related with low-angle normal faulting on the eastern flank of the Nomo Ridge. Shimabara Basin is a composite volcano-tectonic depression which is studded by east–west faults. Focal mechanism on active faults suggests transtensional stress regime in the study area.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1046/j.1440-1738.1999.00223.x

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Quaternary changes in delivery and accumulation of organic matter in sediments of Lake Biwa, Japan (1997)

Meyers, Philip A. ; Takemura, Keiji

Springer

Journal of paleolimnology 18 (1997), S. 211-218

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ISSN: 1573-0417

Keywords: δ13C organic ; glacial-interglacial cycles ; mass accumulation rates ; C/N ratios

Source: Springer Online Journal Archives 1860-2000

Topics: Biology , Geosciences

Notes: Abstract A 911-m-long sediment core from Lake Biwa, Japan, provides a record of organic matter delivery and accumulation in this large lake during a succession of tectonic and climatic changes dating back to the latest Pliocene. Sediments deposited since 430 ky are profundal; older sediments vary in setting between shallow-water and fluviodeltaic conditions, with occasional deep-water intervals. C/N ratios identify algal production as the dominant source of organic matter throughout the core, although the proportion of land-derived contributions episodically increases in the fluviodeltaic and shallow-water sediments. Rates of organic matter delivery and burial in lake sediments change in response to glacial-interglacial climate changes over the past 430 ky. Sediments deposited during interglacial intervals have organic carbon mass accumulation rates up to 9 times greater than those from glacial intervals, reflecting interglacial climates that were wetter than glacial climates. Algal production of organic matter increased during interglacial times because of greater wash-in of soil nutrients, and organic matter preservation was enhanced because of faster sedimentation rates.