The late diagenetic conversion of pyrite to magnetite by organically complexed ferric iron

Brothers, L.A.; Engel, Michael H.; Elmore, R. Douglas

doi:10.1016/0009-2541(96)00007-1

Cited by 64 publications

(47 citation statements)

References 37 publications

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“…Oliver, 1986). Either externally or internally derived fluids could have caused magnetite formation along with mineralization, potassium metasomatism, dedolomitization and dolomitization (Suk et al, 1990;Brothers et al, 1996;Xu et al, 1998;Elmore et al, 2006). Meanwhile, burial diagenesis could also play an important role because the transformation of smectite to illite would serve as a source for the iron in ChRM magnetite without the need for extensive volumes of fluid (Elmore et al, 1993;Katz et al, 1998;Katz et al, 2000;Woods et al, 2002;Blumstein et al, 2004).…”

Section: 2 R E M a G N E T I Z A T I O N M E C H A N I S Mmentioning

confidence: 97%

Remagnetization mechanism of Lower Cretaceous rocks from the Organyà Basin (Pyrenees, Spain)

et al. 2008

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Widespread Cretaceous remagnetization is documented in several Mesozoic basins in North Central Spain. Organyà Basin (South Central Pyrenean foreland) is atypical in the sense that the lower part of the rock sequence (Berriasian-Barremian limestones) is remagnetized while the upper portion (Aptian-Albian marls) is not (Dinarès-Turell and García-Senz, 2000). Here, this view is confirmed by the analysis of 41 new paleomagnetic sites over the entire basin, so that a 3D view is obtained. Thermoviscous resetting of the natural remanent magnetization can be ruled out, hence the remagnetization is chemical in origin. A positive breccia-test on remagnetized strata constrains the remagnetization age to older than the Paleocene-Eocene, when the backthrust system was active. The remagnetization is argued to have occurred early in the geological history of the Organyà Basin either in the elevated geothermal gradient regime during the syn-rift extension or at the earliest phase of the later compression. Burial is considered the most important cause combined with the lithological effect that limestones are more prone to express remagnetization than marls. The observed pressure solution in the remagnetized limestone is likely associated with the remagnetization, whereas it is unlikely that externally derived fluids have played an important role.K e y w o r d s : natural remanent magnetization, remagnetization mechanism, Cretaceous, Pyrenees

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Section: 2 R E M a G N E T I Z A T I O N M E C H A N I S Mmentioning

confidence: 97%

Remagnetization mechanism of Lower Cretaceous rocks from the Organyà Basin (Pyrenees, Spain)

et al. 2008

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“…Experimental decomposition of pyrrhotite to magnetite has been observed at hightemperature under low oxygen fugacity conditions (e.g., Groves et al, 1987;Srinivasachar et al, 1990). Brothers et al (1996) have proposed that the transformation of pyrite to pyrrhotite and then to magnetite with increasing temperature involves OM degradation. Thorpe et al (1984) have experimentally shown that, at 350°C, under low oxygen fugacity conditions, pyrite partially converts to magnetite (between 5% and 20% of the total amount of pyrite), which then forms a crust around pyrite grains.…”

Section: Origin Of Maghemite: a Reaction Halo?mentioning

confidence: 98%

Multiscale characterization of pyritized plant tissues in blueschist facies metamorphic rocks

Bernard

Benzerara

Beyssac

et al. 2010

Geochimica et Cosmochimica Acta

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“…Cioppa et al 2002;Font et al 2006). Laboratory simulation experiments have also successfully produced magnetite by dissolutionreprecipitation of pyrite (Brothers et al 1996). These experiments may simulate diagenesis at temperatures below 100 8C, one possible pathway for magnetite authigenesis.…”

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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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The late diagenetic conversion of pyrite to magnetite by organically complexed ferric iron

Cited by 64 publications

References 37 publications

Remagnetization mechanism of Lower Cretaceous rocks from the Organyà Basin (Pyrenees, Spain)

Remagnetization mechanism of Lower Cretaceous rocks from the Organyà Basin (Pyrenees, Spain)

Multiscale characterization of pyritized plant tissues in blueschist facies metamorphic rocks

Remagnetization and chemical alteration of sedimentary rocks

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