Evidence for an Early Cretaceous mineralizing event above the basement/sediment unconformity in the intraccratonic Paris Basin : paragenetic sequence and Sm-Nd dating of the world-class Pierre-Perthuis stratabound fluorite deposit. - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Mineralium Deposita Année : 2015

Evidence for an Early Cretaceous mineralizing event above the basement/sediment unconformity in the intraccratonic Paris Basin : paragenetic sequence and Sm-Nd dating of the world-class Pierre-Perthuis stratabound fluorite deposit.

Morgane Gigoux
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G. Delpech
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M. Pagel
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Philippe Négrel
B. Brigaud

Résumé

LETTER Evidence for an Early Cretaceous mineralizing event above the basement/sediment unconformity in the intracratonic Paris Basin: paragenetic sequence and Sm-Nd dating of the world-class Pierre-Perthuis stratabound fluorite deposit Morgane Gigoux 1,2 & Guillaume Delpech 1 & Catherine Guerrot 2 & Maurice Pagel 1 & Thierry Augé 2 & Philippe Négrel 2 & Benjamin Brigaud 1 Received: 22 October 2014 /Accepted: 22 April 2015 /Published online: 3 May 2015 # Springer-Verlag Berlin Heidelberg 2015 Abstract World-class stratabound fluorite deposits are spa- tially associated with the basement/sediment unconformity of the intracratonic Paris Basin and the Morvan Massif in Burgundy (France). The reserves are estimated to be about 5.5 Mt of fluorite within six fluorite deposits. In this study, we aim to determine the age of the major fluorite mineraliza- tion event of the Pierre-Perthuis deposit (1.4 Mt fluorite) by a combined study of the paragenetic mineral sequence and Sm- Nd dating on fluorite crystals. Fluorite occurs as isolated cubes or filling geodes in a Triassic, silicified, dolomitic for- mation. Threefluoritestagesassociated with sphalerite,pyrite, galena, barite, and quartz have been distinguished using opti- cal, cathodoluminescence, and scanning electron micro- scopes. Seven crystals of the geodic fluorite stage were ana- lyzed for their rare earth element (REE) contents and their 147 Sm/ 144 Nd and 143 Nd/ 144 Nd isotopic compositions. The normalized REE distribution displays homogeneous bell- shaped patterns for all the geodic fluorite samples with a Mid-REE enrichment over the Light-REE and Heavy-REE. The 147 Sm/ 144 Nd varies from 0.3108 to 0.5504 and the 143 Nd/ 144 Nd from 0.512313 to 0.512518. A six-point Sm- Nd isochron defines an age of 130±15 Ma (initial 143 Nd/ 144 Nd=0.512054, MSWD=0.21). This Sm-Nd iso- chron provides the first age for the stratabound fluorite
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hal-01153189 , version 1 (19-05-2015)

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Morgane Gigoux, G. Delpech, Catherine Guerrot, M. Pagel, Thierry Augé, et al.. Evidence for an Early Cretaceous mineralizing event above the basement/sediment unconformity in the intraccratonic Paris Basin : paragenetic sequence and Sm-Nd dating of the world-class Pierre-Perthuis stratabound fluorite deposit.. Mineralium Deposita, 2015, 50 (4), pp.455-463. ⟨10.1007/s00126-015-0592-1⟩. ⟨hal-01153189⟩
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