Previous   |    Next

doi:10.2204/iodp.proc.340.205.2016

Data report: component and grain size analysis of visible tephra layers, Cores 1H through 6H, Holes U1396A and U1396B, southwest Montserrat¹

Adam J. Stinton^{2, 3}

Abstract

Integrated Ocean Drilling Program Expedition 340 recovered up to 138 m of continuous core from Site U1396, 55 km southwest of Montserrat. The recovered section contains >180 visible tephra layers dating to ~4.5 Ma. Of these, the uppermost 70 tephra layers date to 2.5 Ma, covering the period of known subaerial volcanism on Montserrat. Each tephra sample underwent component analysis through point counting and grain size analysis with a Malvern Mastersizer 2000 particle size analyzer. Component analysis shows that the tephras are dominated by grains consisting of glass shards and crystals. A small number of samples from within Core 340-U1396A-6H contained scoria. Grain size analysis showed that most tephras consist of fine to medium sand and are poorly to moderately sorted.

¹ Stinton, A.J., 2016. Data report: component and grain size analysis of visible tephra layers, Cores 1H through 6H, Holes U1396A and U1396B, southwest Montserrat. In Le Friant, A., Ishizuka, O., Stroncik, N.A., and the Expedition 340 Scientists, Proceedings of the Integrated Ocean Drilling Program, 340: Tokyo (Integrated Ocean Drilling Program Management International, Inc.).
doi:10.2204/iodp.proc.340.205.2016

² Montserrat Volcano Observatory, Flemmings, Montserrat, West Indies. adam@mvo.ms

³ Also at Seismic Research Centre, University of the West Indies, St. Augustine, Trinidad and Tobago.

Initial receipt: 6 May 2015
Acceptance: 12 September 2016
Publication: 4 November 2016
MS 340-205

Top of page   |   Previous   |    Next