NDLI: Late Devonian-Early Carboniferous peak sulphide mineralization in the Western Hercynides

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Late Devonian-Early Carboniferous peak sulphide mineralization in the Western Hercynides

Mineralium Deposita : Volume 32

Late Devonian-Early Carboniferous peak sulphide mineralization in the Western Hercynides

Content Provider	Springer Nature Link
Author	Lescuyer, J. L. Leistel, J. M. Marcoux, E. Milési, J. P. Thiéblemont, D.
Copyright Year	1997
Abstract	The Late Devonian-Early Carboniferous (Dinantian) within the Western Hercynides is marked by the formation of volcanic-hosted massive sulphide deposits: Chessy and Chizeuil in the Brévenne and Somme successions of the French Massif Central; Bodennec and La Porte-aux-Moines in the Châteaulin Basin of the French Armorican Massif; Rio Tinto, Neves-Corvo, Tharsis, etc., in the Volcano-Sedimentary formation of the Iberian Pyrite Belt; and Ketara, Draa Sfar and Hajar in the Jebilet-Guemassa district of the Moroccan Southern Meseta. Although these deposits show a slightly diachronous emplacement in response to a progressive migration of the metalliferous event from Late Devonian in France to Dinantian in Morocco, it is nevertheless possible to define an overall metalliferous ‘‘peak” around 350 Ma. The mineralization of the Armorican, Iberian and Moroccan sectors took place in epicontinental domains of the outer zone of the Hercynian belt, whereas that of the northeastern Massif Central occurred within the inner zone of the belt. This difference is registered by variations both in the geochemical characteristics of the ores (Sn in the outer zone and Mo-Ni in the inner zone) and in their lead isotopic signatures (clear mantle participation exclusively in the inner zone). In many cases the ores appear to be closely related to the felsic member of a bimodal magmatic association, although the massive sulphide deposits in the outer zone are more commonly associated with sedimentary rocks whereas those in the inner zone are hosted by felsic volcanic rocks. Another feature that should be noted is that the host sequences of the massive sulphide deposits commonly seem to be underlain by chaotic formations (notably with olistoliths) reflecting the beginning of Hercynian orogenic activity in the outer zone. It can be concluded that the peak mineralization took place within tensional domains developed during a period of plate convergence, and that it occurred around 350 Ma after a major period of Devonian compression but before the Carboniferous continental closure. (translated by E. Pascual) El periodo que va del Devónico tardío al inicio del Carbonífero (Dinantiense) dentro de la Cadena Hercínica occidental está marcado por la formación de depósitos de sulfuros masivos ligados a rocas volcánicas: Chessy y Chizeuil en las sucesiones de Brévenne y Somme en el Macizo Central francés; Bodennec y La Porte-aux-Moines en la cuenca de Châteaulin en el Macizo Armoricano francés; Riotinto, Neves Corvo, Tharsis y otros en el Complejo Vulcanosedimentario de la Faja Pirítica Ibérica, y Ketara, Draa Sfar y Hajar en el distrito de Jebilet-Guemassa de la Meseta meridional marroquí. Aunque estos depósitos muestran un emplazamiento ligeramente diacrónico en respuesta a la migración del evento metalífero, del Devónico tardío en Francia al Dinantiense en Marruecos, se puede definir a grandes rasgos un ‘‘pico” metalífero a unos 350 m.a. La mineralización de los sectores armoricano, ibérico y marroquí tuvo lugar en dominios epicontinentales de la zona exterior del cinturón hercínico, mientras que la del nordeste del Macizo Central tuvo lugar en su zona interna. Esta diferencia se refleja en variaciones, tanto en las características geoquímicas de los minerales (Sn en las zonas externas y Mo-Ni en las internas) como en su signatura isotópica de plomo, con clara participación del manto sólo en las zonas internas. En muchos casos las mineralizaciones parecen estar estrechamente relacionadas al miembro félsico de las asociaciones magmáticas bimodales, aunque los depósitos de sulfuros masivos de las zonas externas están asociados con más frecuencias con rocas sedimentarias, y los de las zonas internas con rocas volcánicas félsicas. Otro rasgo que conviene señalar es que las secuencias huéspedes de los depósitos de sulfuros masivos parecen desarrollarse frecuentemente sobre formaciones caóticas (particularmente con olistolitos), reflejando el comienzo de la actividad hercínica orogénica en la zona externa. Se puede concluir que el pico de mineralizaciones se desarrolló en dominios tectónicos tensionales durante un periodo de convergencia de placas, y que ocurrió hace unos 350 m.a. después de un periodo mayor devónico de compresión, pero antes del cierre continental carbonífero.
Starting Page	208
Ending Page	220
Page Count	13
File Format	PDF
ISSN	00264598
Journal	Mineralium Deposita
Volume Number	33
Issue Number	1
e-ISSN	14321866
Language	English
Publisher	Springer-Verlag
Publisher Date	1997-12-02
Publisher Place	Berlin/Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Content Type	Text
Resource Type	Article
Subject	Geophysics Economic Geology Geochemistry and Petrology

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