Bulletin of the Mizunami Fossil Museum, 24, 79–193.A table will build here, selectable with mouse for copying to a spreadsheetįor variable stars of short period there is a non-neglible time-scale variability of period 1 year due to the Earth's orbit about the Sun. Triassic and Lower Jurassic radiolarian biostratigraphy in the siliceous claystone and bedded chert units of the southeastern Mino Terrane, Central Japan. Correlating the end-Triassic mass extinction and flood basalt volcanism at the 100000-year level. Schoene, B., Guex, J., Bartolini, A., Schaltegger, U., & Blackburn, T. Journal of the Geological Society of Japan, 116(10), 575–578. Discovery of Ni-rich spinels in Upper Triassic chert of the Mino Terrane, central Japan. Journal of the Proceedings of the National Academy of Sciences, 109(47), 19134–19139. Deep-sea record of impact apparently unrelated to mass extinction in the Late Triassic. Onoue, T., Sato, H., Nakamura, T., Noguchi, T., Hidaka, Y., Shirai, N., et al. Strong chaos induced by close encounters with Ceres and Vesta. Laskar, J., Gastineau, M., Delisle, J.-B., Farres, A., & Fienga, A. La2010: A new orbital solution for the long term motion of the Earth. Laskar, J., Fienga, A., Gastineau, M., & Manche, H.
Long period astronomical cycles from the Triassic to Jurassic bedded chert sequence (Inuyama, Japan) Geologic evidences for the chaotic behavior of Solar Planets. Earth and Planetary Science Letters, 297, 369–378. Astronomical cycle origin of bedded chert middle Triassic bedded chert sequence, Inuyama, Japan.
Origin of cyclicity in Triassic-Jurassic radiolarian bedded cherts of the Mino accretionary complex from Japan. Canadian Journal of Earth Sciences, 42, 777–790. Global correlation of the radiolarian faunal change across the Triassic-Jurassic boundary.
Thus, the cyclostratigraphy of the Inuyama bedded chert provides numerical ages for the Triassic to Lower Jurassic stage boundaries, constraints on the chaotic behaviour of solar planets, and information on biogeochemical silica-cycle dynamics. The newly established ATS tuned by the 405-kyr cycle and anchored at the end-Triassic radiolarian extinction level gives ages consistent with radiometric ages projected onto the sequence using biostratigraphy.
#EARTHTIME ASTRONIMICAL TIME SCALE FULL#
The sedimentary rhythms of bedded chert display a full range of climatic precession-related cycles: a ~20-kyr cycle as a chert–shale couplet and ~100-kyr, 405-kyr, ~2000–4000-kyr, and ~10,000-kyr (~10-Myr) cycles as chert bed thickness variations, which principally reflect changes in the burial rate of biogenic silica, most likely due to changes in silicate weathering rates. Here, we present the ATS constructed from the early Mesozoic deep-sea sequence of the Inuyama area, central Japan. However, construction of the Mesozoic ATS is hampered by the chaotic behaviour of solar planets and the lack of a continuous pelagic sequence for the early Mesozoic due to the subduction of the ocean floor. The astronomical time scale (ATS) for geological records is nearly complete for Cenozoic strata, and attempts have been made to extend the scale to Mesozoic and older ages.
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