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Liraite, ideally NaCa 2 Mn 2 [Fe 3+ Fe 2+ ]Mn 2 (PO 4 ) 6 (H 2 O) 2 , a new phosphate mineral of the wicksite group from the Ceferino Namuncurá pegmatite, Córdoba, Argentina
The Phosphate mineral assemblages from La Viquita Pegmatite, San Luis, Argentina
Granitic Pegmatites and Their Minerals: A Tribute To Petr Černý Preface
Granitic Pegmatites and Their Minerals: A Second Tribute To Petr Černý Preface
The Composition of Gahnite in Granitic Pegmatites from the Pampean Pegmatite Province, Argentina: Implications For Pegmatite Fractionation
AN ASSEMBLAGE OF BISMUTH-RICH, TELLURIUM-BEARING MINERALS IN THE EL QUEMADO GRANITIC PEGMATITE, NEVADOS DE PALERMO, SALTA, ARGENTINA
GRANITIC PEGMATITES AND THEIR MINERALS: A SECOND TRIBUTE TO PETR ČERNÝ
Granitic Pegmatites and their Minerals: a Tribute to Petr ČernÝ
Mineralogy and Origin of the Dumortierite-Bearing Pegmatites of Virorco, San Luis, Argentina
Phosphate nodules containing two distinct assemblages in the Cema granitic pegmatite, San Luis province, Argentina: Paragenesis, composition and significance
An association of secondary Al–Li–Be–Ca–Sr phosphates in the San Elías pegmatite, San Luis, Argentina
THE CRYSTAL STRUCTURE OF ALFREDSTELZNERITE, Ca 4 (H 2 O) 4 [B 4 O 4 (OH) 6 ] 4 (H 2 O) 15 , A COMPLEX HYDROXY-HYDRATED CALCIUM BORATE MINERAL
BOBFERGUSONITE FROM THE NANCY PEGMATITE, SAN LUIS RANGE, ARGENTINA: CRYSTAL-STRUCTURE REFINEMENT AND CHEMICAL COMPOSITION
STRANDED AND EQUILIBRATED ASSEMBLAGES OF LATE FELDSPARS IN TWO GRANITIC PEGMATITES IN THE PAMPEAN RANGES, ARGENTINA
REFINEMENT OF THE CRYSTAL STRUCTURE OF USHKOVITE FROM NEVADOS DE PALERMO, REPÚBLICA ARGENTINA
Bederite, a new pegmatite phosphate mineral from Nevados de Palermo, Argentina; description and crystal structure
Mitridatite from the San Luis granitic pegmatite, La Florida, Argentina
Petrology and geochemistry of the Cachi high-alumina trondhjemites, northwestern Argentina
The trondhjemites of the Cachi Range (24°10′ to 25°07′S latitude and 66°10′ to 66°30′ W longitude) are a group of epizonal stocks that have a minimum Cambrian age. These postkinematic stocks intrude folded slates and graywackes of the crystalline basement of the Cachi Range in the Eastern Cordillera of northwestern Argentina. They are leucocratic rocks composed of plagioclase (An30 to An10) and quartz, with biotite, muscovite, and possible magmatic epidote as the principal accessory minerals. Minor amounts of microcline, cordierite, tourmaline, and garnet occur in some samples. A swarm of peraluminous pegmatites with rare-element mineralization formed by fractional crystallization of the main magma. The rocks are classified as high-alumina trondhjemites (average of 22 analyses: SiO 2 —71.82 percent; TiO 2 —0.20 percent; Al 2 O 3 —16.83 percent; Fe 2 O 3t —1.53 percent; MnO—0.02 percent; MgO—0.52 percent; CaO—2.37 percent; Na 2 O—5.23 percent; K 2 O—0.85 percent; P 2 O 5 —0.06 percent; and Li—21 ppm; Rb—51 ppm; Sr—638 ppm; Y—19 ppm; Zr—150 ppm; Co—24 ppm; and Cr—17 ppm). These rocks are poor in LIL elements and have Rb/Sr ratios of 0.08, typical of continental trondhjemites. The Ba/CaO and Y/CaO ratios are consistent with an origin by partial melting of amphibolite. The data suggest that partial melting of a basaltic source is a more likely origin for the Cachi trondhjemites than a scheme involving fractional crystallization of a tholeiitic magma. We suggest that this magmatism must have been related to a continental-margin magmatic arc.