Photographic Atlas of an Accretionary Prism: Geologic by Asahiko Taira

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By Asahiko Taira

Based on Cretaceous-Tertiary accretionary sequences of the Shimanto Belt in Japan, the advanced historical past of those enormously uncovered rocks is summarized via a chain of outcrop- to microscopic scale pictures, sketches, and geological maps, such a lot of that are in complete color. This atlas broadens the bottom of common wisdom of the expansion of continental margins, and gives either a basic creation to analyze in accretionary prisms in addition to an schooling reduction for college students in sedimentology, structural geology and tectonics.

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Extra info for Photographic Atlas of an Accretionary Prism: Geologic Structures of the Shimanto Belt, Japan

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These categories are: early, transitional and la te-stage structures. The earliest structures in submarine convergent margins typically develop in the shallowest and most seaward levels of the margin where the sediments are water-rich and barely lithified. These early structures therefore document the tectonic dewatering of the sediments. The transitional structures form after the initial stages of accretion and generally reflect deformation within the accretionary wedge. These structures typically form in sediments that are dewatered, relatively cohesive and well lithified.

Cretaceous Tei Melange, Yasu Town, Kochi Prefecture, Shikoku (13-Figure 7).

The clear age differences between the rock types observed in the melange zone, however, eXclude the possibility that this complieated mixing resulted from sedimentary and volcano-plutonie processes. Although the melange zones appear to record a chaotic or random mixture of rock types, two remarkable facts indieate that the melange was formed by an orderly process. First, the melange zones are characterized by a remarkably uniform suite of rock assemblages, as described above, that occur in tectonostratigraphie horizons that are traceable laterally for a distance of up to 250 km.

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