Columbite-group minerals from rare-metal granitic pegmatites of the Sierra de San Luis,Argentina

Sosa, Graciela; Augsburger, M. S.; Pedregosa, J. C.

doi:10.1127/0935-1221/2002/0014-0627

Cited by 23 publications

(14 citation statements)

References 7 publications

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“…Steenken et al, 2003Steenken et al, , 2004. The reported ages match, to a large extent, previous data (Galliski and Linares, 1999;Sosa et al, 2002; for a review, see Sato et al, 2003b), though Cambrian-Early Ordovician K-Ar Ms cooling ages are not confirmed. The high analytical errors of the previous data (usually more than 20 Ma) impede a clear-cut evaluation of their meaning for the temperature development of the Sierra de San Luis.…”

Section: Differential Coolingsupporting

confidence: 82%

Time constraints on the Famatinian and Achalian structural evolution of the basement of the Sierra de San Luis (Eastern Sierras Pampeanas, Argentina)

Steenken

Siegesmund

Wemmer

et al. 2008

Journal of South American Earth Sciences

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Section: Differential Coolingsupporting

confidence: 82%

Time constraints on the Famatinian and Achalian structural evolution of the basement of the Sierra de San Luis (Eastern Sierras Pampeanas, Argentina)

Steenken

Siegesmund

Wemmer

et al. 2008

Journal of South American Earth Sciences

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“…Thus, they have a Mn/(Mn + Fe) ratio varying between 0.401 and 0.603 and a Ta/(Ta + Nb) ratio ranging from 0.564 to 0.739. In general, similar evolutionary trends are represented by the columbite-group minerals of other LCT pegmatites, such as the northern group of the Cross Lake pegmatite field (Černý and Ercit 1985) and Greer Lake (Černý et al 1986), both in Manitoba; the beryl-columbite phosphate pegmatites of the Sebago granite-pegmatite system, Maine, USA (Wise and Brown 2010), Los Chilenitos, Argentina (Sosa et al 2002), and Cap de Creus, Spain (Alfonso et al 1995).…”

Section: Chemical Evolution Of the Columbitegroup Mineralsmentioning

confidence: 81%

Oxide minerals in the granitic cupola of the Jálama Batholith, Salamanca, Spain. Part I: accessory Sn, Nb, Ta and Ti minerals in leucogranites, aplites and pegmatites

Llorens¹,

Moro²

2012

J. Geosci.

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Sn-Nb-Ta-Ti oxides occur as accessory minerals in the granitic facies of the External Unit in the Jálama Batholith (Salamanca, Spain) and in the related LCT pegmatite dikes of the rare-element class. Moreover, abundant cassiterite and columbite-group minerals crystallized in the Cruz del Rayo peribatholithic pegmatite dikes, cutting the pre-Ordovician low-grade metasedimentary rocks of the surrounding Schist-Graywacke Complex. Cassiterite, rutile, ilmenite and tantalite-(Fe) occur disseminated in the border facies of the External Unit, especially throughout the tourmaline-bearing leucogranite and the apical aplites. Additionally, cassiterite, rutile and Ta-rich rutile developed locally in the intragranitic pegmatite dikes. Two types of peribatholithic pegmatites can be distinguished at Cruz del Rayo: (i) granite-like pegmatites, with columbite-(Fe) I and II and cassiterite, in which the influence of metasomatic fluids led to formation of the late albite unit and crystallization of tantalite-(Fe), and (ii) greisen-like bodies, which contain high amounts of columbite-(Fe), columbite-(Mn), tantalite-(Mn) I and II as well as cassiterite. The primary oxide assemblage in both types of the peribatholithic pegmatite dikes would have crystallized as a result of magmatic differentiation of the residual melts coming from the Jálama granitic cupola. However, crystallization of the secondary assemblage, richer in Fe and Ta, is interpreted mainly as a consequence of interaction with external fluids coming from the metamorphic host rocks, more or less mixed with meteoric fluids, although partial dissolution and re-precipitation could have played an important role, as well.

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“…Extensive discussion on the problems related to isotopic closure is given in Villa (1998). The post-metamorphic cooling history of the different basement domains has been previously accessed by K/Ar dating on micas of various grain sizes (Varela et al 1994;Sims et al 1998;González and Sato 2000;Sosa et al 2002;Steenken et al 2004Steenken et al , 2008. Those results suggest that the cooling front as it is recorded by the Ar system in biotite commenced in the Nogolí Metamorphic Complex from where it migrated to the east.…”

Section: Discussionmentioning

confidence: 99%

The tectonic significance of K/Ar illite fine-fraction ages from the San Luis Formation (Eastern Sierras Pampeanas, Argentina)

Wemmer

Steenken²,

Müller

et al. 2011

Int J Earth Sci (Geol Rundsch)

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The Sierra de San Luis forms the southern tip of the Eastern Sierras Pampeanas in central Argentina. Two narrow belts of low-grade phyllites and quartz arenites, i.e. the San Luis Formation, have accommodated part of the strain-related differential exhumation of the medium-to high-grade metamorphic domains that constitute to the basement complex of the sierra. Eleven phyllite samples were subjected to the K/Ar fine-fraction dating technique. Results are interpreted in relation to the Kübler index of the illites, which indicate epimetamorphic conditions for the majority of the samples. Obtained ages between 330 and 290 Ma cover a period of compressional tectonics in the late Mississippian (Visean/Serpukhovian boundary) followed by the subsidence during the formation of the Paganzo Basin in the provinces of La Rioja and San Luis. These tectonic movements are coincident with the Toco orogeny in northern Chile and southern Bolivia. This suggests that the older K/Ar ages document the compressional stage and that younger ages record the cooling of the basement during the subsequent extensional uplift of the basement.

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Columbite-group minerals from rare-metal granitic pegmatites of the Sierra de San Luis,Argentina

Cited by 23 publications

References 7 publications

Time constraints on the Famatinian and Achalian structural evolution of the basement of the Sierra de San Luis (Eastern Sierras Pampeanas, Argentina)

Time constraints on the Famatinian and Achalian structural evolution of the basement of the Sierra de San Luis (Eastern Sierras Pampeanas, Argentina)

Oxide minerals in the granitic cupola of the Jálama Batholith, Salamanca, Spain. Part I: accessory Sn, Nb, Ta and Ti minerals in leucogranites, aplites and pegmatites

The tectonic significance of K/Ar illite fine-fraction ages from the San Luis Formation (Eastern Sierras Pampeanas, Argentina)

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