NDLI: Diagenetic Dissolution of Biogenic Magnetite in Surface Sediments of the Benguela Upwelling System

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International Journal of Earth Sciences : Volume 88, Issue 3, October 1999

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Diagenetic Dissolution of Biogenic Magnetite in Surface Sediments of the Benguela Upwelling System

Content Provider	Springer Nature Link
Author	Hilgenfeldt, K.
Copyright Year	2000
Abstract	Intense primary biologic productivity in the surface waters of the Benguela upwelling system provides a high supply of organic matter to the sea floor at the continental slope off Namibia and sustains extreme concentrations of magnetite producing bacteria in the top sediment layers. Biogenic magnetite is thus by far the dominant carrier of the magnetic signal in these deposits also because of a very minor input of terrigenous ferrimagnetic minerals. Reducing conditions in the sediment column cause a selective dissolution of the bacterial magnetite fraction just a few centimeters below the main mineralization horizon. This diagenetic process is documented in detail by high-resolution rock magnetic analyses and transmission electron microscopy. Concentration dependent and grain-size sensitive magnetic parameters, such as susceptibility, laboratory imparted remanences, and hysteresis data, reveal a significant drop in ferrimagnetic mineral content within the upper 10 cm of the sediments accompanied by a gradual downward coarsening of the ferrimagnetic mineral assemblage from primarily magnetic single-domain particles in the top centimeters to multi-domain grains in deeper strata. Electron microscope observations enable both an unequivocal identification of bacterial magnetite on the basis of shape and grain-size and to trace dissolution effects on the biogenic magnetic mineral component to depth.
Starting Page	630
Ending Page	640
Page Count	11
File Format	PDF
ISSN	14373254
Journal	International Journal of Earth Sciences
Volume Number	88
Issue Number	4
e-ISSN	14373262
Language	English
Publisher	Springer-Verlag
Publisher Date	2000-03-22
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Content Type	Text
Resource Type	Article
Subject	Earth and Planetary Sciences

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