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doi:10.2204/iodp.proc.311.207.2009

Introduction

Operations during Integrated Ocean Drilling Program (IODP) Expedition 311 drilled five sites across the northern Cascadia margin (see the "Expedition 311 summary" chapter). Among the five sites, the northeast–southwest transect of Sites U1329, U1327, U1325, and U1326 was cored to investigate gas hydrate occurrence and formation. Cold vent Site U1328 was also drilled. Based on recovered core sections, Sites U1329, U1327, U1326, and U1328 are divided into three lithostratigraphic units (I, II, and III) and Site U1325 is divided into five lithostratigraphic subunits (IA, IB, II, III, and IV) (see the "Expedition 311 summary" chapter). Characterization of elements (total carbon [TC], total nitrogen [TN], and total sulfur [TS]) and organic matter in bulk sediments according to transect and lithostratigraphic units could be helpful in understanding the depositional environment, diagenesis, and origin of organic matter and give additional information about gas hydrate occurrence. Hence, this study reports several geochemical results on bulk sediments from the northern Cascadia margin.

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