Alasino, Pablo H. and Dahlquist, Juan A. and Galindo Francisco, Mª del Carmen and Casquet, César and Saavedra, Julio (2010) Andalusite and Na- and Li-rich cordierite in the La Costa pluton, Sierras Pampeanas, Argentina: textural and chemical evidence for a magmatic origin. International journal of earth sciences, 99 (5). pp. 1051-1065. ISSN 1437-3254
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Official URL: http://www.springer.com/geology/journal/531
Abstract
The La Costa pluton in the Sierra de Velasco (NW Argentina) consists of S-type granitoids that can be grouped into three igneous facies: the alkali-rich Santa Cruz facies (SCF, SiO2 *67 wt%) distinguished by the presence of andalusite and Na- and Li-rich cordierite (Na2O = 1.55–1.77 wt% and Li2O = 0.14–0.66 wt%), the Anillaco facies (SiO2 *74 wt%) with a significant proportion of Mn-rich garnet, and the Anjullo´n facies (SiO2 *75 wt%) with abundant albitic plagioclase. The petrography, mineral chemistry and whole-rock geochemistry of the SCF are compatible with magmatic crystallization of Na- and Li-rich cordierite, andalusite and muscovite from the peraluminous magma under moderate P–T conditions (*1.9 kbar and ca. 735C). The high Li content of cordierite in the SCF is unusual for granitic rocks of intermediate composition.
| Item Type: | Article |
|---|---|
| Additional Information: | The original publication is available at www.springerlink.com |
| Uncontrolled Keywords: | Andalusite Na- and Li-rich cordierite S-type granite La Costa pluton Sierras Pampeanas |
| Subjects: | Sciences > Geology > Petrology |
| ID Code: | 11393 |
| Deposited On: | 29 Oct 2010 13:31 |
| Last Modified: | 01 Sep 2011 13:40 |
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