Costa Rica Accretionary Wedge

Abstract

To gain a better understanding of the mechanical and chemical behavior of accretion and underplating and tectonic erosion and to determine how deformation and dewatering are distributed throughout an accretionary prism, it is essential to establish the flow pattern of materials through subduction systems.

Trench floor depositional response to glacio-eustatic changes over the last 45 ka, northern Hikurangi subduction margin, New Zealand

“…Sediment cores recovered during half a century of ocean drilling and shallow (<30 m depth) gravity/piston coring show that trench facies in siliciclastic settings are dominated by gravity-flow deposits with varied proportions of hemipelagite and tephra (e.g., Piper et al 1973;Aubouin et al 1982a, b;Taira and Niitsuma, 1985;Kimura et al 1997;Westbrook et al 1994;Underwood and Moore, 1995;Nelson et al 2000a;Moore et al 2001;Underwood, 2007;Harris et al 2013;Jaeger et al 2014;Barnes et al 2019). Typical sediment accumulation rates (SAR) range from 0.2 to >1.5 m/kyr, and temporal variability in those rates may be affected by numerous factors including tectonic uplift of detrital source area, progressive deformation of the accretionary prism, seismicity, volcanism, changes in climate and eustatic sea-level, and anthropogenic landscape modification (von Huene and Kulm, 1973;Nelson, 1976;Underwood and Karig, 1980;Underwood and Moore, 1995;Völker et al 2006;Covault and Graham, 2010;Goldfinger et al 2012;Pouderoux et al 2012a;Harris and Whiteway, 2011;Bourget et al 2011;Kuehl et al 2016;Soutter et al 2021).…”