The age and timing of folding in the central Appalachians from paleomagnetic results

Stamatakos, John; Hirt, Ann M.; Lowrie, William

doi:10.1130/0016-7606(1996)108<0815:taatof>2.3.co;2

Cited by 80 publications

(42 citation statements)

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“…Miller & Kent 1988). In the central Appalachians, post-folding remagnetizations near the hinterland, syntilting remagnetizations in the central part of the belt and pre-folding remagnetizations near the foreland were interpreted to be consistent with brine migration (Stamatakos et al 1996). Migration of orogenic fluids has also been proposed as an explanation for some regional trends in magnetite authigenesis (e.g.…”

Section: Orogenic Fluidsmentioning

confidence: 93%

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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: Orogenic Fluidsmentioning

confidence: 93%

“…CRMs have also been used to constrain the timing of deformation (e.g. Stamatakos et al 1996;Weil & Van der Voo 2002a). Magnetic susceptibility data and remagnetizations can also have applications in hydrocarbon exploration.…”

mentioning

confidence: 99%

Remagnetization and chemical alteration of sedimentary rocks

Elmore

Muxworthy

Aldana

2012

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“…Unfortunately it is hard to relate the remagnetization explicitly to the folding because in the OB only one remagnetized fold limb is exposed. So, establishing an early or late acquisition depending on position in the orogenic front as proposed for Paleozoic limestones in North America (Stamatakos et al, 1996;Enkin et al, 2000) is not possible for the OB. Whether remagnetization is acquired during partial tilting to the South (as anticipated in the extensional setting) is currently being explored.…”

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: 96%

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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“…Deformation in the Valley and Ridge has been shown to be diachronous, first in the southern Appalachians, then later in the central Appalachians (Dean et al, 1988;Miller and Kent, 1988). Stamatakos et al (1996), however, found from paleomagnetic evidence that remagnetization was relatively rapid at ca. 255-285 Ma in the central Appalachians, postdated folding toward the hinterland, and predates the folding toward the structural front.…”

Section: An Interpretation Of the Reflectivity Patternsmentioning

confidence: 95%