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Citation link: http://nbn-resolving.de/urn:nbn:de:gbv:46-diss000110434
00011043.pdf
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Assessing the fidelity of the marine sedimentary magnetic record:Preservation and diagenetic alteration of magnetic mineral assemblages in upwelling regions off western Africa


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Other Titles: Qualitätsanalyse des magnetischen Sedimentsignals: Erhaltung und diagenetische Alteration des magnetischen Mineralinventars in Auftriebsgebieten vor Westafrika
Authors: Dillon, Melanie 
Supervisor: Bleil, Ulrich
1. Expert: Bleil, Ulrich
Experts: Kasten, Sabine
Abstract: 
Magnetic particles usually occur in very minor concentrations in igneous and sedimentary rocks, soils, volcanic ashes, dusts and even in living organisms. Many of these magnetic grains are capable of carrying a stable permanent magnetization and therefore act as recorders of the recent and ancient Earthà �à ´s magnetic field. Thus paleomagnetism refers to the study of this remanent magnetization in sedimentary and volcanic rocks through time. From this magnetization, directional intensity information can be recovered concerning the geomagnetic field that prevailed at the sample location at the time of the rock formation. The magnetic parameter on which such paleomagnetic studies are based is the natural remanent magnetization (NRM). In continental margin regions the remanence acquisition process is often complicated by post-depositional modifications of the original magnetic material. After deposition magnetic minerals can be altered or new magnetic phases can be formed. Consequently the original NRM might be obscured or even fully erased. The process of diagenesis and authigenesis may thus seriously compromise paleomagnetic interpretation. Therefore our knowledge of the geomagnetic field behavior based on sediment records from continental margin regions remains limited. To obtain fully reliable information about the geomagnetic field or paleoenvironmental conditions from continental margin regions, the effect of early diagenetic processes occurring after deposition of the sediment must be understood in detail.
Keywords: marine sediments; diagenesis; anoxic environments; paleomagnetism; low-temperature magnetism; magnetic Fe-Ti-Oxides
Issue Date: 30-May-2008
Type: Dissertation
URN: urn:nbn:de:gbv:46-diss000110434
Institution: Universität Bremen 
Faculty: FB5 Geowissenschaften 
Appears in Collections:Dissertationen

  

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