Chemical remagnetization and clay diagenesis: testing the hypothesis in the Cretaceous sedimentary rocks of northwestern Montana

Gill, J. D.; Elmore, R. Douglas; Engel, Michael H.

doi:10.1016/s1474-7065(02)00108-0

Cited by 32 publications

(37 citation statements)

References 24 publications

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“…Lu et al 1991;Hirt et al 1993;Katz et al 1998Katz et al , 2000Gill et al 2002;Woods et al 2002;Zegers et al 2003;Blumstein et al 2004;Moreau et al 2005;Tohver et al 2008). Many of these studies incorporated presence/absence tests (e.g.…”

Section: Smectite To Illitementioning

confidence: 99%

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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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Section: Smectite To Illitementioning

confidence: 99%

“…Many of these studies incorporated presence/absence tests (e.g. Katz et al 2000;Gill et al 2002;Woods et al 2002). Weil & Van der Voo (2002b) noted the presence of microscale Fe oxides in a matrix of Fe-rich smectite and aluminous illite.…”

Section: Smectite To Illitementioning

confidence: 99%

Remagnetization and chemical alteration of sedimentary rocks

Elmore

Muxworthy

Aldana

2012

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“…For example, a recently completed field study suggests a relationship between remagnetization and the maturation of organic matter in Mississippian carbonates in Utah . Other field studies also suggest a connection between the smectite to illite transition and acquisition of a CRM (e.g., Katz et al, 2000;Woods et al, 2002;Gill et al, 2002). We have tested this hypothesized connection by conducting K-Ar dating of authigenic illites in units with CRMs (e.g., Elliott et al, 2006a;Elliott et al, 2006b).…”

Section: Introductionmentioning

confidence: 89%

Development and Application of a Paleomagnetic/Geochemical Method for Constraining the Timing of Burial Diagenetic Events

Elmore¹,

Engel²

2006

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1 PROJECT SUMMARYStudies of diagenesis caused by fluid migration or other events are commonly hindered by a lack of temporal control. Our results to date demonstrate that a paleomagnetic/geochemical approach can be used to date fluid migration as well as burial diagenetic events. Our principal working hypothesis is that burial diagenetic processes (e.g., maturation of organic-rich sediments and clay diagenesis) and the migration of fluids can trigger the authigenesis of magnetic mineral phases. The ages of these events can be constrained by comparing chemical remanent magnetizations (CRMs) to independently established Apparent Polar Wander Paths. Whilst geochemical (e.g. stable isotope and organic analyses) and petrographic studies provide important clues for establishing these relationships, the ultimate test of this hypothesis requires the application of independent dating methods to verify the paleomagnetic ages. Towards this end, we have used KAr dating of illitization as an alternative method for constraining the ages of magnetic mineral phases in our field areas.We have made significant progress toward understanding the origin and timing of chemical remagnetization related to burial diagenetic processes. For example, a recently completed field study documents a relationship between remagnetization and the maturation of organic matter . We have tested the hypothesized connection between clay diagenesis and remagnetization by conducting K-Ar dating of authigenic illites in units in Scotland and Montana with CRMs (e.g., Elliott et al., 2006a;Elliott et al., 2006b). We have also developed a fluid related model for alteration and remagnetization of Appalachian red beds that involves reduction and mobilization of iron phases by hydrocarbons and precipitation of authigenic hematite as a result of the introduction of meteoric fluid recharge . In addition, our recent studies of fluid-related CRMs along faults in Scotland provide information on the timing and origin of fluid flow events along the Moine and Great Glen faults Blumstein et al., 2005;.

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“…In the Sweetgrass Arch, east of the disturbed belt, the stratigraphically equivalent units are undeformed and less thermally mature, based on the presence of randomly ordered (R = 0) I-S with high percentages (N 70%) of smectite layers in bentonites (Hoffman et al, 1976). Gill et al (2002) tested for a connection between illitization and remagnetization by comparing paleomagnetic results from illite-rich Mesozoic strata in the disturbed belt with those from stratigraphically equivalent smectite-rich clay mineral assemblages in the nearby Sweetgrass Arch. They found a prefolding or early synfolding, reversed, Tertiary magnetization in the disturbed belt rocks, which they interpreted to be a CRM residing in magnetite and perhaps pyrrhotite.…”

Section: Geological Settingmentioning

confidence: 99%

“…A presence-absence test and the timing of acquisition for the CRM suggest that magnetite authigenesis could have been causally related to the smectite-to-illite transformation. In contrast to the previous study by Gill et al (2002), which included results from a number of different Mesozoic units, this study is limited to results from concretions and from a potassium bentonite in the Marias River Shale.…”

Section: Geological Settingmentioning

confidence: 99%