A late diagenetic (syn-folding) magnetization carried by pyrrhotite: implications for paleomagnetic studies from magnetic iron sulphide-bearing sediments

Weaver, R. M.; Roberts, Andrew; Barker, Andrew

doi:10.1016/s0012-821x(02)00652-0

Cited by 107 publications

(112 citation statements)

References 44 publications

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“…Notwithstanding the possibility that sedimentary pyrrhotite can have a detrital origin, slow formation of monoclinic pyrrhotite can occur (Figure 12d-k). Its presence is a clear indicator that paleomagnetic signals will be complex and will not date to the time of deposition (e.g., Dinarès-Turell and Dekkers, 1999;Weaver et al, 2002;Larrasoaña et al, 2007;Roberts et al, 2010). The contrasting petrographic context and morphology of detrital (Figure 12b, c) compared to authigenic pyrrhotite ( Figure 12d-k), and the high electron backscatter of iron sulphides compared to siliciclastic sediment components, makes it relatively straightforward to distinguish these modes of pyrrhotite occurrence.…”

Section: Pyrrhotite Formationmentioning

confidence: 99%

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Magnetic mineral diagenesis

Roberts

2015

Earth-Science Reviews

343

347

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Section: Pyrrhotite Formationmentioning

confidence: 99%

“…Nevertheless, if AOM occurred deeper in the sediment column, then the possibility of late remagnetization, as has been widely observed in methanic marine sediments (e.g., Roberts and Weaver, 2002;Sagnotti et al, 2005a;Larrasoaña et al, 2007;van Dongen et al, 2007), will need to be considered.…”

Section: Accepted Manuscriptmentioning

confidence: 99%

Magnetic mineral diagenesis

Roberts

2015

Earth-Science Reviews

343

347

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“…Dekkers et al 1989;Rochette et al 1990;Jackson et al 1993;Hirt et al 1995;Xu et al 1998;Weaver et al 2002;Crouzet et al 2003;Gillett & Karlin 2004;Font et al 2006;Preeden et al 2008;. Although some of the remagnetizations are thermoviscous in origin (Kligfield & Channell 1981), many are interpreted to be chemical in origin with several remagnetization mechanisms proposed.…”

Section: Other Remagnetization Mechanismsmentioning

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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“…6c), suggesting the presence of hematite in some samples. Metasediment samples are characterized by a soft fraction decay at~300°C, which could be related to the presence of iron sulfides (e.g., Weaver et al 2002;Fig. 6d and the relative thermomagnetic curve in Fig.…”

Section: Rock Magnetic Datamentioning

confidence: 99%

High-temperature emplacement of the Cerro Galán and Toconquis Group ignimbrites (Puna plateau, NW Argentina) determined by TRM analyses

et al. 2011

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Estimates of pyroclastic flow emplacement temperatures in the Cerro Galán ignimbrite and Toconquis Group ignimbrites were determined using thermal remanent magnetization of lithic clasts embedded within the deposits. These ignimbrites belong to the Cerro Galán volcanic system, one of the largest calderas in the world, in the Puna plateau, NW Argentina. Temperature estimates for the 2.08-Ma Cerro Galán ignimbrite are retrieved from 40 sites in 14 localities (176 measured clasts), distributed at different distances from the caldera and different stratigraphic heights. Additionally, temperature estimates were obtained from 27 sample sites (125 measured clasts) from seven ignimbrite units forming the older Toconquis Group (5.60-4.51 Ma), mainly outcropping along a type section at Rio Las Pitas, Vega Real Grande. The paleomagnetic data obtained by progressive thermal demagnetization show that the clasts of the Cerro Galán ignimbrite have one single magnetic component, oriented close to the expected geomagnetic field at the time of emplacement. Results show therefore that most of the clasts acquired a new magnetization oriented parallel to the magnetic field at the moment of the ignimbrite deposition, suggesting that the clasts were heated up to or above the highest blocking temperature (T b ) of the magnetic minerals (T b =580°C for magnetite;

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A late diagenetic (syn-folding) magnetization carried by pyrrhotite: implications for paleomagnetic studies from magnetic iron sulphide-bearing sediments

Cited by 107 publications

References 44 publications

Magnetic mineral diagenesis

Magnetic mineral diagenesis

Remagnetization and chemical alteration of sedimentary rocks

High-temperature emplacement of the Cerro Galán and Toconquis Group ignimbrites (Puna plateau, NW Argentina) determined by TRM analyses

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