ORCID Profile
0000-0001-6215-2593
Current Organisations
Michigan Technological University
,
Rey Juan Carlos University
Does something not look right? The information on this page has been harvested from data sources that may not be up to date. We continue to work with information providers to improve coverage and quality. To report an issue, use the Feedback Form.
Publisher: Springer International Publishing
Date: 13-10-2016
Publisher: IEEE
Date: 09-2015
Publisher: Elsevier BV
Date: 2013
Publisher: Proceedings of the National Academy of Sciences
Date: 18-11-2008
Abstract: We report the discovery of exceptionally large biogenic magnetite crystals in clay-rich sediments spanning the Paleocene–Eocene Thermal Maximum (PETM) in a borehole at Ancora, NJ. Aside from previously described abundant bacterial magnetofossils, electron microscopy reveals novel spearhead-like and spindle-like magnetite up to 4 μm long and hexaoctahedral prisms up to 1.4 μm long. Similar to magnetite produced by magnetotactic bacteria, these single-crystal particles exhibit chemical composition, lattice perfection, and oxygen isotopes consistent with an aquatic origin. Electron holography indicates single-domain magnetization despite their large crystal size. We suggest that the development of a thick suboxic zone with high iron bioavailability—a product of dramatic changes in weathering and sedimentation patterns driven by severe global warming—drove ersification of magnetite-forming organisms, likely including eukaryotes.
No related grants have been discovered for Antonio J. del-Ama.