Journal of Paleolimnology

, Volume 43, Issue 2, pp 273–291 | Cite as

Re-examination of air-gun profiles from Lake Biwa (Japan), and depositional history of the lake in the Pliocene-quaternary

Original Paper

Abstract

Re-examination of a seismic survey taken with a 120-inch3 air gun and 12-channel streamer along 267 km, revealed five stratigraphic units overlying the acoustic basement in the central and northern subbasins of Lake Biwa, Japan: seismic units Tau, Sigma, Rho, Qoppa and Pi, in descending order. Units Tau, Sigma, and Rho are correlative to the clayey T, sandy S, and silty R lithologic units, respectively, in a 1,400-m drill core. Unit Tau is subdivided into Tau4, Tau3, Tau2, and Tau1, in descending order, and Sigma is subdivided into Sigma2 and Sigma1, in descending order. The unit distribution and acoustic facies reveal that the depocentre migrated from the central to the northern subbasin from Sigma1 to Tau2. Based on growth strata around the central flexure bounding the subbasins, northern subbasin subsidence accelerated after the Tau3 period. In the northern subbasin, Sigma1 directly overlies the basement, which has a constant height. Before the Sigma1 period, only the central subbasin existed, and the northern subbasin was undergoing erosion. Although Tau is generally composed of moderate-amplitude, continuous reflections, Tau1 in the northern subbasin consists of high-amplitude, less continuous reflections, like unit Sigma. This seismic facies can be interpreted as reflecting shallow lacustrine or fluvial conditions. The northern subbasin was probably still shallow in the Tau1 period. In the subsequent Tau2 period, basinwide profundal lacustrine deposition occurred. Tau2 and Tau3 have three backstepping packages with downlap terminations in the northern subbasin, which suggest repetitive transgressions, probably induced by interglacial climate in marine isotope stages 7 and 5.

Keywords

Japan Lake Biwa Lake level history Pleistocene Backstep Seismic stratigraphy 

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Copyright information

© Springer Science+Business Media B.V. 2009

Authors and Affiliations

  1. 1.Geological Survey of Japan, AISTTsukubaJapan

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