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doi:10.2204/iodp.proc.324.204.2013

Introduction

This report provides the results of a geochemical study of seven cores consisting of biogenic and clastic sediments recovered during Integrated Ocean Drilling Program (IODP) Expedition 324 from Hole U1347A situated close to the summit of Tamu Massif (Fig. F1). Tamu Massif is the main edifice forming Shatsky Rise, and thus sampling this volcano was one of the main objectives of this JOIDES Resolution expedition (Sager et al., 2009). The main coring targets of Site U1347 were to recover as much as possible of the oldest sediments overlying the igneous basement and the Early Cretaceous igneous basement (Sano et al., 2012). The aim of coring the igneous rocks was to determine the basement age and its geochemical and isotopic characteristics to constrain the age progression and duration of volcanism at Shatsky Rise and its magma sources, temperature and depth of melting and crystallization, and degree of partial melting. Studies of the sediment overlying the igneous basement were intended to constrain the sedimentation rates and processes atop the volcanic rise to better understand the eruption and subsidence history of the rise.

In this context we wanted to test if the geochemical characterization of cored volcaniclastic material by means of high-resolution X-ray fluorescence core scans is a useful tool to investigate the depositional history and the formation of volcaniclastic deposits.

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