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• W2109912524 abstract "The Jasimampa area in the Sierra de Sumampa de Santiago del Estero,Argentina, contains light rare earth element (LREE: Th-Nb) mineralizationassociated with several stages of carbonates and widespread fenitization ofmarble, granite (496 ± 2.9 Ma), and alkaline and siliceous igneous comenditedikes (U/Pb zircon age of 390 Ma) derived from fractionation of oceanic islandbasalts. This is the third discovery of LREE mineralization in Argentina andmarks a new alkaline intracontinental magmatic event of Devonian age. Albite (Ab 97-99 ) + aegirine (Ae 70-92 Ja 1-11 Q 6-19 )± hematite ± Mg-arfvedsonite ± fluorine-rich apatite and late Ca-Fe-Mncarbonates ± monazite ± pyrochlore overprint and crosscut granite andcomendite outcrops in a 15 km 2 area; locally, the Na-rich assemblageis pervasive and results in total destruction of host rocks. Na-Fe metasomatismnear granite and comendite produced aegirine (Ae 86-91 Ja 1-8 Q 6-11 )± Mg-arfvedsonite and minor albite (Ab 98-99 ) in adjacent marble,with multiple stages of late Ca-Mn-Mg-Fe carbonates associated with iron andmanganese oxides, hematite, and traces of sulfides (sphalerite, pyrite, galena).Monazite-(Ce) is the main LREE-bearing mineral and occurs with minorferrocolumbite, pyrochlore, strontiopyrochlore, and apatite associated with asecond generation of fine-grained hematite, barite, and celestine. Structuralcontrols on Na-Fe-Ca alteration and LREE mineralization in granitoid and marbleprotoliths include brittle-ductile shear zones, brittle fracture systems, and aseries of monolithologic and heterolithologic breccias with hydrothermalaegirine, carbonate, and chalcedony matrices that occur at granite-marble-comenditecontacts. Fragments of multiple breccia types within breccias indicate multipleepisodes of brecciation, alteration, and mineralization. The fluid responsible for early fenitization of granite and comendite wasaqueous-carbonic with CO 2 of relatively high density (between 0.85and 0.95 g/cm 3 ), salinity near 9 wt percent NaCl equiv, and minimumtemperatures in the range of 250° to 280°C. Pervasively altered comendite andgranite have high total REE content (1,750 ppm and 2,126 ppm, respectively),mainly LREE. Early banded and mottled aegirine ± arfvedsonite replacements ofmarble have high absolute REE abundance (2,513–4,663 ppm) compared to theleast altered marble (476 ppm). Subsequent hydrothermal stages with carbonates,hematite, pyrolusite, monazite, and subordinate celestine and barite causedalteration of marble that was accompanied by an increase in absolute REEabundance, up to 15.45 wt percent, and high Sr (10.5 wt %), Th (4,390 ppm), andBa (1.8 wt %). Alteration and mineralization at Jasimampa are the result of late-stagecarbonatitic magma fractionation and fluid exsolution. This is indicated by thestrongly alkaline character of early alteration, the composition of thehydrothermal carbonates, apatite, and LREE-Sr- and Ba-rich minerals, thechondrite-normalized REE patterns showing strong LREE enrichment without an Euanomaly, and the replacement of marble by assemblages with very high Ba, Th,LREE, and Sr, and strong K, Zr, and Ti depletions. The alteration style andmineralization at Jasimampa are similar to the giant Fe-LREE-Nb deposit BayanObo and other hydrothermal LREE deposits hosted in carbonatites of China." @default.
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• W2109912524 date "2005-06-01" @default.
• W2109912524 modified "2023-10-07" @default.
• W2109912524 title "Na-Fe-Ca Alteration and LREE (Th-Nb) Mineralization in Marble andGranitoids of Sierra de Sumampa, Santiago del Estero, Argentina" @default.
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• W2109912524 doi "https://doi.org/10.2113/gsecongeo.100.4.733" @default.
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