Cosmogenic Particles

104kb image [709a/a >63]1 Pitted composite silicate/ Fe-oxide cosmic spherule. Pitting due to silicate glass removal in the sediment pore waters. Presumed magnetite dendrites {magnetic extract} Indian Ocean, Mascarene Plateau, ODP hole 709, depth 6-8.5m (Quaternary). [M.W. Hounslow]
94 kb image2 Close up of above, showing the Fe-Oxides (magnetite ?) dendrites. The knobbly surface crust in lower right may be a remnant of an ablation crust (Fe-oxide ?)  on surface of spherule. Indian Ocean, Mascarene Plateau, ODP hole 709, depth 6-8.5m (Quaternary). [M.W. Hounslow]
114kb image3 Smooth-surfaced Oxide/silicate spherule- showing less pitting than 1. Linear arrangement of etch pits very typical of spherules from this locality. {magnetic extract} Indian Ocean, Mascarene Plateau, ODP hole 709, depth 6-8.5m (Quaternary). [M.W. Hounslow]