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doi:10.2204/iodp.proc.310.202.2009

Data report: geochemistry of volcaniclastic sediments drilled during IODP Expedition 310 in Tahiti¹

Paterno Castillo²

Abstract

Variable amounts of volcaniclastic sediments are present in the carbonate rocks that were drilled in the Tiarei, Maraa, and Faaa areas seaward of the modern fringing reefs in Tahiti during Integrated Ocean Drilling Program Expedition 310. Twenty-four representative samples of volcaniclastic sediments from the Tiarei area, ranging in grain size from clay to boulder, were analyzed for major and trace element contents. The samples are variably altered, but the least altered ones are compositionally similar to the igneous rocks of the island of Tahiti. Four samples that were dated by the ⁴⁰Ar/³⁹Ar dating method range in age from 0.3 to 0.7 Ma. Age data combined with geochemical data indicate that the bulk of the volcaniclastic sediments originated from the younger (≤1.3 Ma) rock series in Tahiti. Most of the fine-grained samples were also analyzed for their total, organic, and inorganic carbon contents; the samples show a general decrease in carbon contents with depth.

¹Castillo, P., 2009. Data report: geochemistry of volcaniclastic sediments drilled during IODP Expedition 310 in Tahiti. In Camoin, G.F., Iryu, Y., McInroy, D.B., and the Expedition 310 Scientists, Proc. IODP, 310: Washington, DC (Integrated Ocean Drilling Program Management International, Inc.). doi:10.2204/​iodp.proc.310.202.2009

²Scripps Institution of Oceanography, University of California, San Diego, La Jolla CA 92093-0212, USA. pcastillo@ucsd.edu

Initial receipt: 18 August 2008
Acceptance: 15 May 2009
Publication: 14 July 2009
MS 310-202

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