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  • 1
    Digitale Medien
    Digitale Medien
    Mesozoic radiolarians and radiolarian-bearing sequences in the circum-Pacific regions: A report of the symposium-‘Radiolarians and Orogenic Belts’ (1996)
    Oxford, UK : Blackwell Publishing Ltd
    The @island arc 5 (1996), S. 0 
    Details
    ISSN: 1440-1738
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Geologie und Paläontologie
    Notizen: Abstract This paper contains extended abstracts of the seven papers presented at the symposium ‘Radiolarians and Orogenic Belts’ held at the seventh meeting of the International Association of Radiolarian Paleontologists (INTERRAD). Important results of the symposium include the following: (1) Upper Paleozoic and Mesozoic cherts are widely distributed within accretionary complexes in the circum-Pacific orogenic belt. Radiolarian dating reveals that long durations of chert sedimentation in a pelagic environment are recorded on both sides of Pacific-rim accretionary complexes (e.g. New Zealand, Japan, Russian Far East, Canadian Cordillera). (2) Triassic radiolarian faunas from New Zealand and the Omolon Massif, northeast Siberia are similar in composition and are characterized by the absence of typical Tethyan elements. This suggests that radiolarian faunal provincialism may have been established as early as the Triassic. High-latitude radiolarian taxa exhibit a bi-polar distribution pattern. (3) The Lower Triassic interval in chert dominant pelagic sequences is mechanically weaker than other levels and acted as a décollement in accretionary events. This lithologic. contrast in physical property is considered to reflect radiolarian evolution, such as the end-Permian mass extinction.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1440-1738.1996.tb00026.x
    Standort Signatur Erwartet Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    Jurassic and Lower Cretaceous radiolarian zonation in Japan and in the western Pacific (1995)
    Oxford, UK : Blackwell Publishing Ltd
    The @island arc 4 (1995), S. 0 
    Details
    ISSN: 1440-1738
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Geologie und Paläontologie
    Notizen: Abstract A radiolarian zonal scheme for the entire Jurassic and Lower Cretaceous using biostratigraphic data from both Japanese Island sections and the western Pacific seafloor is documented. The zonation is applicable to low and middle paleolatitude portions of the Paleo-Pacific ocean. Radiolarian bio-events such as the evolutionary first appearance biohorizon, first occurrence biohorizon, and last occurrence biohorizon were used to define zones. The 11 zones proposed are, in ascending order, Parahsuum simplum, Trillus elkhornensis, Laxtorum(?) jurassicum, Tricolocapsa plicarum, Tricolocapsa conexa, Stylocapsa(?) spiralis, Hsuum maxwelli, Pseudodictyomitra primitiva, Pseudodictyomitra carpatica, Cecrops sep-temporatus, and Acanthocircus carinatus zones. Preliminary age assignments for these zones are presented.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1440-1738.1995.tb00138.x
    Standort Signatur Erwartet Verfügbarkeit
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