caa a22 4500 463216113 CHVBK 20180405153156.0 cr unu---uuuuu 170326e20070201xx s 000 0 eng 10.1007/s00367-006-0037-z doi (NATIONALLICENCE)springer-10.1007/s00367-006-0037-z Tectonic control over topography and channel sedimentation across the forearc slope of the southern Kurile Trench [Elektronische Daten] [Taqumi TuZino, Atsushi Noda] A high-resolution seismic survey covering more than 2,000km2 has revealed the processes responsible for the slope morphology and channel sedimentation across the forearc slope-basin of the Kurile Arc-NE Japan Arc collision zone, offshore from Tokachi (Hokkaido, Japan). The dominant slope contours parallel the trench but, in the middle and lower reaches of the southern slope, contours are convex-shaped with an offshore trend. This sector of the slope is traversed diagonally by the Hiroo submarine channel. The offshore-trending convex contours and the channel course have developed through the interplay of tectonic and sedimentary processes, including the development of anticlines, anticline-induced lobe sedimentation and channel avulsion. In its upper reaches, the channel is restricted by a topographic low associated with NNW-SSE-trending anticlines which developed within the upper and middle slope sectors during late Miocene uplift. The uplift timing and trend of these anticlines indicate that they resulted from collision, the channel sedimentology and slope morphology of the middle and lower slopes having been influenced by Pliocene uplift of NE-SW-trending anticlines. The trends of these anticlines parallel those of the Kurile Trench. The Pliocene and early Pleistocene strata of the middle and lower slopes consist of ponded lobe sediments deposited along the palaeo-Hiroo submarine channel on the landward side of the anticlines. As a lobe pile accumulated, the channel thalweg shifted to the north of the stack, allowing the channel to bypass the topographic high formed by the growing stack. Thick levee deposits built up along the channel course during the late Pleistocene and Holocene. These levees, along with the Pliocene and early Pleistocene lobes, are reflected in the present-day sigmoid-shaped, convex offshore-trending contours. Thus, the interplay of subduction- and collision-related anticlines, tectonic-related channel ponding, and avulsion has contributed to the slope morphology of the southern Kurile Trench. Springer-Verlag, 2006 TuZino Taqumi Geological Survey of Japan, AIST, 305-8567, Tsukuba, Japan aut Noda Atsushi Geological Survey of Japan, AIST, 305-8567, Tsukuba, Japan aut Geo-Marine Letters Springer-Verlag 27/1(2007-02-01), 1-11 0276-0460 27:1<1 2007 27 367 https://doi.org/10.1007/s00367-006-0037-z text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s00367-006-0037-z text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- TuZino Taqumi Geological Survey of Japan, AIST, 305-8567, Tsukuba, Japan aut NATIONALLICENCE 700 1- Noda Atsushi Geological Survey of Japan, AIST, 305-8567, Tsukuba, Japan aut NATIONALLICENCE 773 0- Geo-Marine Letters Springer-Verlag 27/1(2007-02-01), 1-11 0276-0460 27:1<1 2007 27 367 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer