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doi:10.2204/iodp.proc.340.207.2016 IntroductionIntegrated Ocean Drilling Program (IODP) Expedition 340 cored several sites within the Lesser Antilles volcanic arc region. The overall goal of the project was to drill volcanogenic landslides in the marine environment to establish a record of eruption cycles and the impact of these landslides on the marine sedimentary record. This report focuses on sediment geochemical results from five sites (U1394–U1396, U1399, and U1400; Fig. F1). Sites U1394–U1396 are located south of the island of Montserrat in 1115, 1191, and 801 m of water, respectively (see the “Expedition 340 summary” chapter [Expedition 340 Scientists, 2013a]). Site U1394 is located ~24 km southeast of Montserrat, whereas Site U1395 is located further southeast of Site U1394, between the islands of Montserrat and Guadeloupe (Fig. F1). The lithology of Sites U1394 and U1395 is similar and consists of hemipelagic muds, turbidite deposits, mafic volcaniclastics and volcaniclastic sands, hemipelagic mud, and tephra layers. Although Site U1396 to the west has similar sedimentation to Sites U1394 and U1395, given that this site resides on a bathymetric high our expectation is that the sediments will have a tendency toward more fine grained material; nevertheless, volcaniclastic sand, hemipelagic mud, and tephra layers all dominate this core’s lithology as well (see the “Expedition 340 summary” chapter [Expedition 340 Scientists, 2013a]); Le Friant et al., 2015; Palmer et al., 2016). Sites U1399 and U1400 are located west of the island of Martinique in Grenada Basin in 2900 and 2745 m water depth, respectively (Fig. F1). The lithology of these two sites is similar and is composed of hemipelagic mud, interbedded tephra layers, volcaniclastic turbidites, and deformed sediments (see the “Expedition 340 summary” chapter [Expedition 340 Scientists, 2013a]); Le Friant et al., 2015). Site U1400 is located west of Martinique but closer in proximity to the island than Site U1399 (Fig. F1). |
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