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Typologie du zircon des bentonites du Frasnien (carrière du Lion, Belgique): utilité avant la datation U-Pb

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Typologie du zircon des bentonites du Frasnien (carrière du Lion, Belgique) : utilité avant la datation U-Pb. / Guillot, Francois; Lasalle, Stephanie; Deconinck, Jean-Francois; Pellenard, Pierre; Averbuch, Olivier; Paquette, Jean-Louis; Herbosch, Alain; Devleeschouwer, Xavier.

In: Géologie de la France, No. 1-2, 2006, p. 59-63.

Research output: Contribution to journalArticlepeer-review

Harvard

Guillot, F, Lasalle, S, Deconinck, J-F, Pellenard, P, Averbuch, O, Paquette, J-L, Herbosch, A & Devleeschouwer, X 2006, 'Typologie du zircon des bentonites du Frasnien (carrière du Lion, Belgique): utilité avant la datation U-Pb', Géologie de la France, no. 1-2, pp. 59-63. <http://geolfrance.brgm.fr/article.asp?annee=2006&revue=1&article=9>

APA

Guillot, F., Lasalle, S., Deconinck, J-F., Pellenard, P., Averbuch, O., Paquette, J-L., Herbosch, A., & Devleeschouwer, X. (2006). Typologie du zircon des bentonites du Frasnien (carrière du Lion, Belgique): utilité avant la datation U-Pb. Géologie de la France, (1-2), 59-63. http://geolfrance.brgm.fr/article.asp?annee=2006&revue=1&article=9

Vancouver

Guillot F, Lasalle S, Deconinck J-F, Pellenard P, Averbuch O, Paquette J-L et al. Typologie du zircon des bentonites du Frasnien (carrière du Lion, Belgique): utilité avant la datation U-Pb. Géologie de la France. 2006;(1-2):59-63.

Author

Guillot, Francois ; Lasalle, Stephanie ; Deconinck, Jean-Francois ; Pellenard, Pierre ; Averbuch, Olivier ; Paquette, Jean-Louis ; Herbosch, Alain ; Devleeschouwer, Xavier. / Typologie du zircon des bentonites du Frasnien (carrière du Lion, Belgique) : utilité avant la datation U-Pb. In: Géologie de la France. 2006 ; No. 1-2. pp. 59-63.

Bibtex

@article{4e33baceee1946118c3d0eb922ba28c4,
title = "Typologie du zircon des bentonites du Frasnien (carri{\`e}re du Lion, Belgique): utilit{\'e} avant la datation U-Pb",
abstract = "Zircon morphology and size from bentonites near the Frasnian-Famennian boundary have been investigated. Belonging to the upper rhenana Conodont Zone, one bentonite from Steinbruch Schmidt type section (Germany) has been recently dated by U-Pb on zircon at 377.2 ± 1.7 Ma (Kaufmann et al., 2004). Seven bentonites from the Lion quarry near Frasnes (Belgium, fig. 1A) belong to the hassi (?), jamieae and lower rhenana Zones (fig. 1B). In Frasnes the argillaceous, cm-thick levels have a distinctive mixed-layer illite-smectite clay content, taken as derived from volcanic smectite (Deconinck et al., 2003; Gouwy et al., 2003). Zircon morphologies have been studied after Pupin (1976, 1980) together with the crystal size distributions. No zircon crystals were found over 125 µm in mesh size while most of the separated crystals are under 63 µm. The adjoining Frasnian calcschists yielded no zircon (greater than 32 µm, smallest mesh size). This favours an aeolian-controlled bentonite deposition during discrete events. Zircon morphologies (fig. 1C-D) characterize a volcanic origin for the Frasnes bentonites (4 with high T index, 1 from hyper-alkaline rocks), while Steinbruch Schmidt zircons are typical of plutonic sources (calc-alkaline granite and migmatite). Our provisional U-Pb on zircon age data are all identical, within error (2s), with the Steinbruch Schmidt age, especially the 376.4 ± 0.6 Ma of bentonite 3 belonging to the jamieae Zone (fig. 1B). The results may help bracketting the absolute age of the Frasnian-Famennian boundary. The cheap, naturalist techniques used for characterizing zircon morphology should become a standard operation prior to U-Pb dating of bentonites.",
author = "Francois Guillot and Stephanie Lasalle and Jean-Francois Deconinck and Pierre Pellenard and Olivier Averbuch and Jean-Louis Paquette and Alain Herbosch and Xavier Devleeschouwer",
year = "2006",
language = "French",
pages = "59--63",
journal = "G{\'e}ologie de la France",
issn = "1638-5977",
number = "1-2",

}

RIS

TY - JOUR

T1 - Typologie du zircon des bentonites du Frasnien (carrière du Lion, Belgique)

T2 - utilité avant la datation U-Pb

AU - Guillot, Francois

AU - Lasalle, Stephanie

AU - Deconinck, Jean-Francois

AU - Pellenard, Pierre

AU - Averbuch, Olivier

AU - Paquette, Jean-Louis

AU - Herbosch, Alain

AU - Devleeschouwer, Xavier

PY - 2006

Y1 - 2006

N2 - Zircon morphology and size from bentonites near the Frasnian-Famennian boundary have been investigated. Belonging to the upper rhenana Conodont Zone, one bentonite from Steinbruch Schmidt type section (Germany) has been recently dated by U-Pb on zircon at 377.2 ± 1.7 Ma (Kaufmann et al., 2004). Seven bentonites from the Lion quarry near Frasnes (Belgium, fig. 1A) belong to the hassi (?), jamieae and lower rhenana Zones (fig. 1B). In Frasnes the argillaceous, cm-thick levels have a distinctive mixed-layer illite-smectite clay content, taken as derived from volcanic smectite (Deconinck et al., 2003; Gouwy et al., 2003). Zircon morphologies have been studied after Pupin (1976, 1980) together with the crystal size distributions. No zircon crystals were found over 125 µm in mesh size while most of the separated crystals are under 63 µm. The adjoining Frasnian calcschists yielded no zircon (greater than 32 µm, smallest mesh size). This favours an aeolian-controlled bentonite deposition during discrete events. Zircon morphologies (fig. 1C-D) characterize a volcanic origin for the Frasnes bentonites (4 with high T index, 1 from hyper-alkaline rocks), while Steinbruch Schmidt zircons are typical of plutonic sources (calc-alkaline granite and migmatite). Our provisional U-Pb on zircon age data are all identical, within error (2s), with the Steinbruch Schmidt age, especially the 376.4 ± 0.6 Ma of bentonite 3 belonging to the jamieae Zone (fig. 1B). The results may help bracketting the absolute age of the Frasnian-Famennian boundary. The cheap, naturalist techniques used for characterizing zircon morphology should become a standard operation prior to U-Pb dating of bentonites.

AB - Zircon morphology and size from bentonites near the Frasnian-Famennian boundary have been investigated. Belonging to the upper rhenana Conodont Zone, one bentonite from Steinbruch Schmidt type section (Germany) has been recently dated by U-Pb on zircon at 377.2 ± 1.7 Ma (Kaufmann et al., 2004). Seven bentonites from the Lion quarry near Frasnes (Belgium, fig. 1A) belong to the hassi (?), jamieae and lower rhenana Zones (fig. 1B). In Frasnes the argillaceous, cm-thick levels have a distinctive mixed-layer illite-smectite clay content, taken as derived from volcanic smectite (Deconinck et al., 2003; Gouwy et al., 2003). Zircon morphologies have been studied after Pupin (1976, 1980) together with the crystal size distributions. No zircon crystals were found over 125 µm in mesh size while most of the separated crystals are under 63 µm. The adjoining Frasnian calcschists yielded no zircon (greater than 32 µm, smallest mesh size). This favours an aeolian-controlled bentonite deposition during discrete events. Zircon morphologies (fig. 1C-D) characterize a volcanic origin for the Frasnes bentonites (4 with high T index, 1 from hyper-alkaline rocks), while Steinbruch Schmidt zircons are typical of plutonic sources (calc-alkaline granite and migmatite). Our provisional U-Pb on zircon age data are all identical, within error (2s), with the Steinbruch Schmidt age, especially the 376.4 ± 0.6 Ma of bentonite 3 belonging to the jamieae Zone (fig. 1B). The results may help bracketting the absolute age of the Frasnian-Famennian boundary. The cheap, naturalist techniques used for characterizing zircon morphology should become a standard operation prior to U-Pb dating of bentonites.

M3 - Article

SP - 59

EP - 63

JO - Géologie de la France

JF - Géologie de la France

SN - 1638-5977

IS - 1-2

ER -

ID: 1918405