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doi:10.2204/iodp.proc.314315316.221.2012

Introduction

Provenance of detrital grain populations is of interest for deciphering the tectonic and climatic influences on sediment supply during basin filling. In the case of accretionary prisms, provenance information has further ramifications for assessing the dynamic responses of prism growth and deformation to temporal variations of sediment generation and influx (e.g., Simpson, 2010).

Previous work on detrital modes in the Nankai forearc region has documented a wide range in composition that reflects variable mixing of volcanic, sedimentary, metasedimentary, and plutonic sources (Taira and Niitsuma, 1986; De Rosa et al., 1986; Marsaglia et al., 1992; Fergusson, 2003; Fergusson, 2011; Underwood and Fergusson, 2005).

Here we present a preliminary data set reporting on the modal grain compositions of 35 sand samples (>62 µm fraction) collected at Sites C0004, C0006, C0007, and C0008 during Integrated Ocean Drilling Program (IODP) Expedition 316 (Fig. F1) (see the “Expedition 316 summary” chapter [Screaton et al., 2009]) within the Nankai accretionary prism south of the Kii Peninsula. Data were initially reported by Comer (2008). Low geothermal gradients along this segment of the forearc ensures that thermally driven diagenesis is minimal; burial temperatures are <20°C for the deepest samples at all the sites reported here (see the “Expedition 316 summary” chapter [Screaton et al., 2009]).

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