Palaeomagnetism of the Jurassic Asphaltkalk deposits, Holzen, northern Germany

Katz, Bodo; Elmore, R. Douglas; Engel, Michael H.; Leythaeuser, D.

doi:10.1111/j.1365-246x.1996.tb04721.x

Cited by 4 publications

(3 citation statements)

References 17 publications

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“…Smectite adsorbs organic compounds and the major stage of smectite-illite ordering occurs fairly shortly before oil generation and migration [e.g., . Therefore, the empirical association between CRMs carried by magnetite and organic matter maturation [e.g., or migration [e.g., Katz et al, 1996] should be tested for a possible genetic connection with clay diagenesis.…”

Section: Discussionmentioning

confidence: 99%

Widespread chemical remagnetization: Orogenic fluids or burial diagenesis of clays?

Katz

Elmore

Cogoini

et al. 1998

Geol

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I would like to thank my advisor. Dr. R. Douglas Elmore for his support. He has been of great help during the past years and he has been instrumental in assisting me to leam how to speak, read, and write the second time around. I wish to thank all of my committee members, Drs. Tom Dewers, Mike Engel, Roger Young, and Richard Henry for feedback and for reviewing the manuscript. Dr. Mike Engel is also acknowledged for his collaboration on the geochemical aspects of the dissertation. I especially thank my "better half (more like 60%), Monika Cogoini, for so many things that I would need a separate chapter in this dissertation to mention them all. She is the best friend, colleague, reviewer, orient express, critic, and moral supporter one can imagine, among all the other things. A tremendous "merci beaucoup" goes to Dr. Serge Ferry from the University of Lyon, France, for his great support in the field and for inspiring conversations. I also want to thank the people at the Institute for Rock Magnetism, Minnesota, especially Dr. Mike Jackson, for help and advice during my visit. I thank Dr. James Lee Wilson for being a great inspiration and Dr. Sue Halgedahl for her help during my visit to her Micromag at the University of Utah. Thanks to Dr. Sanjay Banetjee for being a great colleague and for all the inspiring conversations. I am grateful to Jamie Egger for the many hours she dedicated to my samples in the lab. I am also grateful to all my colleagues in the lab, in the School of Geology and Geophysics, and to all the new friends that I made in Oklahoma who made my stay here enjoyable. Last but not least, I thank my parents for making all this possible.

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Section: Discussionmentioning

confidence: 99%

Widespread chemical remagnetization: Orogenic fluids or burial diagenesis of clays?

Katz

Elmore

Cogoini

et al. 1998

Geol

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“…During the conversion, organic compounds are adsorbed and the major stage of smectite-illite ordering occurs fairly shortly before oil generation and migration [e.g., Chamley, 1989]. Therefore the empirical association between CRMs carded by magnetite and organic matter maturation [e.g., Banerj'ee et al, 1997] or migration [e.g., Katz et al, 1996] should be tested for a possible genetic connection with clay diagenesis.…”

Section: A Prefolding Normal Polarity Crm Is Present Throughout Thementioning

confidence: 99%

Associations between burial diagenesis of smectite, chemical remagnetization, and magnetite authigenesis in the Vocontian trough, SE France

Katz¹,

Elmore²,

Cogoini³

et al. 2000

J. Geophys. Res.

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124

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Abstract. Results of a paleomagnetic, rock magnetic, geochemical, and petrographic study on Jurassic and Cretaceous carbonates in the Vocontian trough support a hypothesized connection between burial diagenetic alteration of smectite and the widespread occurrence of a chemical remanent magnetization (CRM) carried by magnetite. Where smectite has altered to other clay minerals, limestones are characterized by a prefolding, secondary, normal polarity magnetization throughout the basin. The magnetization is interpreted to be a CRM based on low burial depths which cannot cause thermoviscous resetting. Where significant smectite is still present, the CRM is absent/weakly developed, and where the clays show no evidence for burial alteration, the units are characterized by a primary magnetization. CRM intensity also varies with the amount of smectite and burial. Isothermal, anhysteretic, and natural remanent magnetization intensifies increase where smectite has altered, both stratigraphically and geographically. This is interpreted to indicate magnetite authigenesis associated with clay aliagenesis. Superparamagnetic magnetite is more dominant in highly altered units based on the results of low-temperature experiments. All sections away from the Alps have 87 Sr/86Sr values that are similar to coeval seawater, and stable isotopes of carbon and oxygen show no sign of alteration. Omgenic-type fluids therefore are not a likely agent of remagnetization. Near the Alps the rocks are characterized by an additional reversed polarity component which is interpreted to reflect acquisition of the CRM through a reversal. A postfolding magnetization is also present there and strontium isotopic ratios are higher than elsewhere in the basin and might indicate some alteration by orogenic-type fluids. We conclude that burial diagenesis of smectite is the likely cause for the development of the widespread CRM in the Vocontian trough and that this mechanism might explain widespread chemical remagnetization elsewhere.

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“…In some cases the magnetite or pyrrhotite carries a CRM (e.g. Benthien & Elmore 1987;Elmore & Crawford 1990;Elmore & Leach 1990;Gose & Kyle 1993;Katz et al 1996;Lewchuk et al 1998). Some studies have presented evidence that secondary magnetite could be responsible for magnetic enhancement in soil polluted by hydrocarbons (Rijal et al 2010).…”

Section: Hydrocarbonsmentioning

confidence: 99%

Remagnetization and chemical alteration of sedimentary rocks

Elmore

Muxworthy

Aldana

2012

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Chemical remagnetization is a very common phenomenon in sedimentary rocks and developing a greater understanding of the mechanisms has several benefits. Acquisition of a secondary magnetization is usually tangible evidence of a diagenetic event that can be dated by isolation of the chemical remanent magnetization and comparison of the pole position to the apparent polar wander path. This can be important because diagenetic investigations are frequently limited by the difficulty in constraining the time frames in which most past events have occurred. Remagnetization can commonly obscure a primary magnetization; developing a better understanding of remagnetization could improve our ability to uncover primary magnetizations. Many chemical remagnetization mechanisms have been proposed, including those associated with chemical alteration by a number of different fluids (orogenic, basinal and hydrocarbons), burial diagenetic processes (clay diagenesis and maturation of organic matter) or other processes. This paper summarizes our current knowledge of these chemical remagnetization mechanisms, with a focus on examples where there is a connection with chemical alteration.

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Palaeomagnetism of the Jurassic Asphaltkalk deposits, Holzen, northern Germany

Cited by 4 publications

References 17 publications

Widespread chemical remagnetization: Orogenic fluids or burial diagenesis of clays?

Widespread chemical remagnetization: Orogenic fluids or burial diagenesis of clays?

Associations between burial diagenesis of smectite, chemical remagnetization, and magnetite authigenesis in the Vocontian trough, SE France

Remagnetization and chemical alteration of sedimentary rocks

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