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زمینشناسی و معدن::
منشور برافزایشی
Accretionary wedge and outer ridge
An accretionary wedge grows from below.
Eight overthrust planes that display repetitions of the sedimentary layers have been drilled at the Vanuatu accretionary wedge in the SW Pacific (Fig. 7.8).
Because the sedimentary layer at the subducting plate has a thickness of slightly more than 100 m, the much greater thickness of the accretionary wedge is a result of intense tectonic
Approximately the lower third of the sedimentary layer is being subducted and does not contribute to the growth of the accretionary wedge.
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