Clastic rocks in Triassic bedded chert in the Mino terrane, central Japan: their petrographic properties and radiolarian ages.
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Biogeochemical signatures preserved in ancient siliceous sediments; new perspectives to Triassic radiolarian bedded chert compositions
Major and minor elements of successively collected 70 Middle Triassic radiolarian bedded cherts from the Mino Belt in central Japan were studied. In order to reveal pre-diagenetic, primary geochemical signatures related to marine biogeochemical cycles, composite data of chert-shale couplets in addition to raw data were examined. The results show that Mn, Cu, Sr, Ba and P were supplied significa...
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. Kojima, S., 1989, Mesozoic terrane accretion in Northeast China, SikhkoteAlin and Japan regions: Palaeogeography, Palaeoclimatology, Palaeoecology, v. 69, p. 213-232. Kojima, S. and Mizutani, S., 1987. Triassic and Jurassic Radiolaria from the Nadanhada Range, Northeast China: Transactions and Proceedings Palaeontological Society of Japan, 148, p. 256-275. Kozur, H., 1984a, New radiolarian ta...
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Introduction: Cosmic spherules are subspherical to spherical particles of <1 mm diameter which are produced by melting of interplanetary dust and large objects during atmospheric entry. Although cosmic spherules are known principally from the ice sheets of polar regions and Cenozoic deep-sea sediments [1-3], a few spherules older than Mesozoic were recovered from the sedimentary rocks of pelagi...
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ژورنال
عنوان ژورنال: The Journal of the Geological Society of Japan
سال: 1999
ISSN: 0016-7630,1349-9963
DOI: 10.5575/geosoc.105.421