Samples were collected at Sites 1225 and 1227 to investigate the occurrence of fine-grained, biogenic magnetic particles (magnetosomes). Several magnetic methods, including anhysteretic remanent magnetization and isothermal remanent magnetization, were used to characterize the main magnetic carriers in the samples. Extracts were made to isolate the fine-grained fraction, which was then examined under a transmission electron microscope. Grains with the unique characteristics of magnetosomes were found in samples from regions in the core with both high and low concentrations of magnetic minerals. This suggests they have the potential to be a persistent proxy of paleoredox conditions.
1Ford, K.H., King, J.W., and Niitsuma, S., 2006. Data report: Preservation of bacterial magnetosomes at Sites 1225 and 1227. In Jørgensen, B.B., D'Hondt, S.L., and Miller, D.J. (Eds.), Proc. ODP, Sci. Results, 201 [Online]. Available from World Wide Web: <http://www-odp.tamu.edu/publications/201_SR/115/115.htm>. [Cited YYYY-MM-DD]
2University of Rhode Island, Graduate School of Oceanography, Narragansett RI, 02882, USA. kathryn.ford@state.ma.us
3Graduate School of Science, Tohoku University, Sendai 980-8578, Japan.
Initial receipt: 26 July 2004
Acceptance: 1 February 2006
Web publication:
12 June 2006
Ms 201SR-115