RT Journal Article
T1 Andalusite and Na- and Li-rich cordierite in the La Costa pluton,Sierras Pampeanas, Argentina: textural and chemical evidencefor a magmatic origin
A1 Alasino, Pablo H.
A1 Dahlquist, Juan A.
A1 Galindo Francisco, María Del Carmen
A1 Casquet Martín, César
A1 Saavedra, Julio
AB The La Costa pluton in the Sierra de Velasco(NW Argentina) consists of S-type granitoids that can begrouped into three igneous facies: the alkali-rich SantaCruz facies (SCF, SiO2 *67 wt%) distinguished by thepresence of andalusite and Na- and Li-rich cordierite(Na2O = 1.55–1.77 wt% and Li2O = 0.14–0.66 wt%), theAnillaco facies (SiO2 *74 wt%) with a significant proportionof Mn-rich garnet, and the Anjullo´n facies (SiO2*75 wt%) with abundant albitic plagioclase. The petrography,mineral chemistry and whole-rock geochemistry ofthe SCF are compatible with magmatic crystallization ofNa- and Li-rich cordierite, andalusite and muscovite fromthe peraluminous magma under moderate P–T conditions(*1.9 kbar and ca. 735C). The high Li content of cordieritein the SCF is unusual for granitic rocks of intermediatecomposition.
PB Springer Science Business Media
SN 1437-3254
YR 2010
FD 2010
LK https://hdl.handle.net/20.500.14352/41799
UL https://hdl.handle.net/20.500.14352/41799
LA eng
NO The original publication is available at www.springerlink.com
DS Docta Complutense
RD 6 abr 2025