Two basement holes were drilled during Ocean Drilling Program (ODP) Leg 206. Hole 1256C penetrates 88.5 m into basement and Hole 1256D, ~30 m to the south, penetrates 502 m into basement (Wilson, Teagle, Acton, et al., 2003). Recovered cores consist of basalts exhibiting the effects of low-temperature alteration by seawater. As part of a larger study of alteration effects, a study of the secondary mineralogy was undertaken. This data report presents the major and some minor element compositions of secondary minerals. Analyses focus on the major secondary phases, phyllosilicates, and less abundant feldspars, but also include limited analyses of carbonates and apatite. Different occurrences of secondary minerals are included (e.g., veins and vesicles replacing olivine and plagioclase) as well as variations with depth.
1Alt, J.C., and Laverne, C., 2006. Data report: Chemical compositions of secondary minerals from Site 1256 basement, ODP Leg 206. In Teagle, D.A.H., Wilson, D.S., Acton, G.D., and Vanko, D.A. (Eds.), Proc. ODP, Sci. Results, 206 [Online]. Available from World Wide Web: <http://www-odp.tamu.edu/publications/206_SR/003/003.htm>. [Cited YYYY-MM-DD]
2Department of Geological Sciences, 2534 C.C. Little Building, The University of Michigan, Ann Arbor MI 48109-1005, USA. jalt@umich.edu
3Laboratoire de Pétrologie Magmatique-Case 44, Université d'Aix-Marseille, Faculté des Sciences de Marseille St-Jérôme, Avenue Escadrille Normandie Niemen, 13397 Marseille Cedex 20, France.
Initial receipt: 29 April 2005
Acceptance: 17 November 2005
Web publication: 21 April 2006
Ms 206SR-003