Magnetic transition at 30–34 Kelvin in pyrrhotite: insight into a widespread occurrence of this mineral in rocks

Rochette, P.; Fillion, G.; Mattéi, Jean-Luc; Dekkers, Mark J.

doi:10.1016/0012-821x(90)90034-u

Cited by 273 publications

(202 citation statements)

References 31 publications

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“…5a). The initial remanence loss (Tp) is attributed to pyrrhotite as previously observed by Dekkers (1989) and Rochette et al (1990). The second remanence loss coincides with the Verwey transition (T V ) of magnetite (Özdemir et al 1993) where Tv is an electronordering transition occurring in a mixed-valent system that results in an ordering of formal valence states in the low-temperature phase.…”

Section: Magnetic Susceptibility Carriersupporting

confidence: 53%

A case study of the internal structures of gossans and weathering processes in the Iberian Pyrite Belt using magnetic fabrics and paleomagnetic dating

et al. 2011

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International audienceIn the Rio Tinto district of the Iberian Pryrite Belt of South Spain, the weathering of massive sulfide bodies form iron caps, i.e., true gossans and their subsequent alteration and re-sedimentation has resulted in iron terraces, i.e., displaced gossans. To study the stucture and evolution of both types of gossans, magnetic investigations have been carried out with two foci: (1) the characterisation and spatial distribution of magnetic fabrics in different mineralised settings, including massive sulfides, gossans, and terraces, and (2) paleomagnetic dating. Hematite has been identified as the suceptibility carrier in all sites and magnetic fabric investigation of four gossans reveals a vertical variation from top to bottom, with: (1) a horizontal foliation refered to as "mature" fabric in the uppermost part of the primary gossans, (2) highly inclined or vertical foliation interpreted as "immature" fabric between the uppermost and lowermost parts, and (3) a vertical foliation interpreted to be inherited from Hercynian deformation in the lowermost part of the profiles. In terraces, a horizontal foliation dominates and is interpreted to be a "sedimentary" fabric. Rock magnetic studies of gossan samples have identified goethite as the magnetic remanence carrier for the low-temperature component, showing either a single direction close to the present Earth field (PEF) direction or random directions. Maghemite, hematite, and occasionally magnetite are the remanence carriers for the stable high-temperature component that is characterized by non PEF directions with both normal and reversed magnetic polarities. No reliable conclusion can be yet be drawn on the timing of terrace magnetization due to the small number of samples. In gossans, the polarity is reversed in the upper part and normal in the lower part. This vertical distribution with a negative reversal test suggests remanence formation during two distinct periods. Remanence in the upper parts of the gossans is older than in the lower parts, indicating that the alteration proceeded from top to bottom of the profiles. In the upper part, the older age and the horizontal "mature" fabric is interpreted to be a high maturation stage of massive sulfides' alteration. In the lower part, the age is younger and the inherited "imature" vertical Hercynian fabric indicates a weak maturation stage. These two distinct periods may reflect changes of paleoclimate, erosion, and/or tectonic motion

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Section: Magnetic Susceptibility Carriersupporting

confidence: 53%

A case study of the internal structures of gossans and weathering processes in the Iberian Pyrite Belt using magnetic fabrics and paleomagnetic dating

et al. 2011

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“…Micron-sized pyrrhotite was also observed in Alpine limestone metamorphic units, northward to our study area, which experienced also such a temperature range (e.g., [1,52,68]). Micron pyrrhotite is a common finding in such metamorphic units.…”

Section: Toward a Burial Modelsupporting

confidence: 57%

“…This behavior is called P-behavior and characterizes the paramagnetic minerals (e.g., submicron pyrrhotite, Fe-Mn carbonates) [9,44]. The second magnetic behavior is the Besnus transition of pyrrhotite, which displays a decrease of the remanence at ~32-35 K [51][52][53]. This particular magnetic behavior is only observed in the NE part of the study area (Villars-Colmars, La Moutière, Gias Vallonetto).…”

Section: General Trendsmentioning

confidence: 97%

Burial Diagenesis of Magnetic Minerals: New Insights from the Grès d’Annot Transect (SE France)

et al. 2014

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Abstract:The diagenetic evolution of the magnetic minerals during burial in sedimentary basins has been recently proposed. In this study, we provide new data from the Grès d'Annot basin, SE France. We analyze fine-grained clastic rocks that suffered a burial temperature from ~60 to >250 °C, i.e., covering oil and gas windows. Low temperature magnetic measurements (10-300 K), coupled with vitrinite reflectance data, aim at defining the magnetic mineral evolution through the burial history. Magnetite is documented throughout the entire studied transect. Goethite, probably occurring as nanoparticles, is found for a burial temperature <80 °C. Micron-sized pyrrhotite is highlighted for a burial temperature >200 °C below the Alpine nappes and the Penninic Front. A model of the evolution of the magnetic assemblage from 60 to >250 °C is proposed for clastic rocks, containing iron sulfides (pyrite) OPEN ACCESSMinerals 2014, 4 668 and organic matter. This work provides the grounds for a better understanding of the magnetic properties of petroleum plays.

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“…2 b) ) recollects the H c increase observed for the monoclinic Fe 7 S 8 NPs observed in Ref. [5]. At the same time, XRD detects the hexagonal phase prevalence in NPs 300.…”

supporting

confidence: 55%

Iron Sulfide Nanoparticles: Preparation, Structure, Magnetic Properties

Dubrovsky¹,

Velikanov²,

Lin³

et al. 2017

J. Sib. Fed. Univ., Math. phys.

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Magnetic transition at 30–34 Kelvin in pyrrhotite: insight into a widespread occurrence of this mineral in rocks

Cited by 273 publications

References 31 publications

A case study of the internal structures of gossans and weathering processes in the Iberian Pyrite Belt using magnetic fabrics and paleomagnetic dating

A case study of the internal structures of gossans and weathering processes in the Iberian Pyrite Belt using magnetic fabrics and paleomagnetic dating

Burial Diagenesis of Magnetic Minerals: New Insights from the Grès d’Annot Transect (SE France)

Iron Sulfide Nanoparticles: Preparation, Structure, Magnetic Properties

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