The composition of gahnite in granitic pegmatites from the Pampean Pegmatite Province, Argentina: Implications for pegmatite fractionation
- Autores
- Heimann, Adriana; Yonts, Jason A.; Galliski, Miguel Angel
- Año de publicación
- 2015
- Idioma
- inglés
- Tipo de recurso
- artículo
- Estado
- versión publicada
- Descripción
- Gahnite from LCT granitic pegmatites of the Comechingones (Blanca Dora, Juan Román, Magdalena, La Ona, and Sin Nombre pegmatites) and Conlara (Nancy pegmatite) pegmatite districts, Argentina, was analyzed to investigate the relationship between its chemistry, pegmatite mineralogy, and pegmatite melt evolution. Based on the molecular proportions of endmembers (gahnite, hercynite, spinel, and galaxite) the composition of gahnite in these pegmatites is defined by the ranges Ghn77.7– 91.0Hc7.4–20.0Spl0.25–3.37Glx0.7–2.4, which fall within the previously defined field for granitic pegmatites. Gahnite from the Nancy pegmatite has higher Mg and Mn contents than gahnite from the pegmatites of the Comechingones pegmatite district. Chemical variation within gahnite crystals is characterized by higher Zn (∼2.8 wt.% ZnO) and lower Fe (∼2.6 wt.% FeO) contents near the edge compared to inner portions, reflecting the evolution of the pegmatite melt via simple fractional crystallization. Other crystals show a complex zoning pattern of oscillations in Fe and Zn contents within the crystal and higher Zn and lower Fe near the rim compared to the core. A plot of molecular Fe2+ + Mg versus Zn + Mn yields a strong negative correlation and best displays the substitutions within the gahnite crystal structure and is the best to determine relative pegmatite melt evolution. Without implying a co-magmatic origin of the pegmatites, based on pegmatite mineralogy, Zn contents, Zn/Fe2+ ratios, and coupled Fe2++Mg and Zn+Mn values in gahnite, the relative degree of evolution of the pegmatites increases in the order: Sin Nombre → Magdalena → Juan Román → Blanca Dora → Nancy → La Ona. Based on the composition of gahnite in worldwide granitic pegmatites reported in the literature and those obtained here, the composition of gahnite in these rocks is defined by the endmember ranges Ghn50–98Hc1–50Spl0–7. This study shows that the major element composition of gahnite in granitic pegmatites can effectively be used to determine the relative degree of evolution of pegmatite-forming melts.
Fil: Heimann, Adriana. East Carolina University; Estados Unidos
Fil: Yonts, Jason A.. East Carolina University; Estados Unidos
Fil: Galliski, Miguel Angel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mendoza. Instituto Argentino de Nivología, Glaciología y Ciencias Ambientales. Provincia de Mendoza. Instituto Argentino de Nivología, Glaciología y Ciencias Ambientales. Universidad Nacional de Cuyo. Instituto Argentino de Nivología, Glaciología y Ciencias Ambientales; Argentina - Materia
-
ARGENTINA
CHEMISTRY
GAHNITE
GRANITIC PEGMATITES
MELT EVOLUTION
PAMPEAN PEGMATITE PROVINCE
ZN - Nivel de accesibilidad
- acceso abierto
- Condiciones de uso
- https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
- Repositorio
.jpg)
- Institución
- Consejo Nacional de Investigaciones Científicas y Técnicas
- OAI Identificador
- oai:ri.conicet.gov.ar:11336/182845
Ver los metadatos del registro completo
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The composition of gahnite in granitic pegmatites from the Pampean Pegmatite Province, Argentina: Implications for pegmatite fractionationHeimann, AdrianaYonts, Jason A.Galliski, Miguel AngelARGENTINACHEMISTRYGAHNITEGRANITIC PEGMATITESMELT EVOLUTIONPAMPEAN PEGMATITE PROVINCEZNhttps://purl.org/becyt/ford/1.5https://purl.org/becyt/ford/1Gahnite from LCT granitic pegmatites of the Comechingones (Blanca Dora, Juan Román, Magdalena, La Ona, and Sin Nombre pegmatites) and Conlara (Nancy pegmatite) pegmatite districts, Argentina, was analyzed to investigate the relationship between its chemistry, pegmatite mineralogy, and pegmatite melt evolution. Based on the molecular proportions of endmembers (gahnite, hercynite, spinel, and galaxite) the composition of gahnite in these pegmatites is defined by the ranges Ghn77.7– 91.0Hc7.4–20.0Spl0.25–3.37Glx0.7–2.4, which fall within the previously defined field for granitic pegmatites. Gahnite from the Nancy pegmatite has higher Mg and Mn contents than gahnite from the pegmatites of the Comechingones pegmatite district. Chemical variation within gahnite crystals is characterized by higher Zn (∼2.8 wt.% ZnO) and lower Fe (∼2.6 wt.% FeO) contents near the edge compared to inner portions, reflecting the evolution of the pegmatite melt via simple fractional crystallization. Other crystals show a complex zoning pattern of oscillations in Fe and Zn contents within the crystal and higher Zn and lower Fe near the rim compared to the core. A plot of molecular Fe2+ + Mg versus Zn + Mn yields a strong negative correlation and best displays the substitutions within the gahnite crystal structure and is the best to determine relative pegmatite melt evolution. Without implying a co-magmatic origin of the pegmatites, based on pegmatite mineralogy, Zn contents, Zn/Fe2+ ratios, and coupled Fe2++Mg and Zn+Mn values in gahnite, the relative degree of evolution of the pegmatites increases in the order: Sin Nombre → Magdalena → Juan Román → Blanca Dora → Nancy → La Ona. Based on the composition of gahnite in worldwide granitic pegmatites reported in the literature and those obtained here, the composition of gahnite in these rocks is defined by the endmember ranges Ghn50–98Hc1–50Spl0–7. This study shows that the major element composition of gahnite in granitic pegmatites can effectively be used to determine the relative degree of evolution of pegmatite-forming melts.Fil: Heimann, Adriana. East Carolina University; Estados UnidosFil: Yonts, Jason A.. East Carolina University; Estados UnidosFil: Galliski, Miguel Angel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mendoza. Instituto Argentino de Nivología, Glaciología y Ciencias Ambientales. Provincia de Mendoza. Instituto Argentino de Nivología, Glaciología y Ciencias Ambientales. Universidad Nacional de Cuyo. Instituto Argentino de Nivología, Glaciología y Ciencias Ambientales; ArgentinaMineralogical Association of Canada2015-12info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/182845Heimann, Adriana; Yonts, Jason A.; Galliski, Miguel Angel; The composition of gahnite in granitic pegmatites from the Pampean Pegmatite Province, Argentina: Implications for pegmatite fractionation; Mineralogical Association of Canada; Canadian Mineralogist; 53; 6; 12-2015; 991-10130008-44761499-1276CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/doi/10.3749/canmin.1400100info:eu-repo/semantics/altIdentifier/url/https://pubs.geoscienceworld.org/canmin/article/53/6/991/521457/The-Composition-of-Gahnite-in-Granitic-Pegmatitesinfo:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-29T10:46:43Zoai:ri.conicet.gov.ar:11336/182845instacron:CONICETInstitucionalhttp://ri.conicet.gov.ar/Organismo científico-tecnológicoNo correspondehttp://ri.conicet.gov.ar/oai/requestdasensio@conicet.gov.ar; lcarlino@conicet.gov.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:34982025-09-29 10:46:43.841CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse |
| dc.title.none.fl_str_mv |
The composition of gahnite in granitic pegmatites from the Pampean Pegmatite Province, Argentina: Implications for pegmatite fractionation |
| title |
The composition of gahnite in granitic pegmatites from the Pampean Pegmatite Province, Argentina: Implications for pegmatite fractionation |
| spellingShingle |
The composition of gahnite in granitic pegmatites from the Pampean Pegmatite Province, Argentina: Implications for pegmatite fractionation Heimann, Adriana ARGENTINA CHEMISTRY GAHNITE GRANITIC PEGMATITES MELT EVOLUTION PAMPEAN PEGMATITE PROVINCE ZN |
| title_short |
The composition of gahnite in granitic pegmatites from the Pampean Pegmatite Province, Argentina: Implications for pegmatite fractionation |
| title_full |
The composition of gahnite in granitic pegmatites from the Pampean Pegmatite Province, Argentina: Implications for pegmatite fractionation |
| title_fullStr |
The composition of gahnite in granitic pegmatites from the Pampean Pegmatite Province, Argentina: Implications for pegmatite fractionation |
| title_full_unstemmed |
The composition of gahnite in granitic pegmatites from the Pampean Pegmatite Province, Argentina: Implications for pegmatite fractionation |
| title_sort |
The composition of gahnite in granitic pegmatites from the Pampean Pegmatite Province, Argentina: Implications for pegmatite fractionation |
| dc.creator.none.fl_str_mv |
Heimann, Adriana Yonts, Jason A. Galliski, Miguel Angel |
| author |
Heimann, Adriana |
| author_facet |
Heimann, Adriana Yonts, Jason A. Galliski, Miguel Angel |
| author_role |
author |
| author2 |
Yonts, Jason A. Galliski, Miguel Angel |
| author2_role |
author author |
| dc.subject.none.fl_str_mv |
ARGENTINA CHEMISTRY GAHNITE GRANITIC PEGMATITES MELT EVOLUTION PAMPEAN PEGMATITE PROVINCE ZN |
| topic |
ARGENTINA CHEMISTRY GAHNITE GRANITIC PEGMATITES MELT EVOLUTION PAMPEAN PEGMATITE PROVINCE ZN |
| purl_subject.fl_str_mv |
https://purl.org/becyt/ford/1.5 https://purl.org/becyt/ford/1 |
| dc.description.none.fl_txt_mv |
Gahnite from LCT granitic pegmatites of the Comechingones (Blanca Dora, Juan Román, Magdalena, La Ona, and Sin Nombre pegmatites) and Conlara (Nancy pegmatite) pegmatite districts, Argentina, was analyzed to investigate the relationship between its chemistry, pegmatite mineralogy, and pegmatite melt evolution. Based on the molecular proportions of endmembers (gahnite, hercynite, spinel, and galaxite) the composition of gahnite in these pegmatites is defined by the ranges Ghn77.7– 91.0Hc7.4–20.0Spl0.25–3.37Glx0.7–2.4, which fall within the previously defined field for granitic pegmatites. Gahnite from the Nancy pegmatite has higher Mg and Mn contents than gahnite from the pegmatites of the Comechingones pegmatite district. Chemical variation within gahnite crystals is characterized by higher Zn (∼2.8 wt.% ZnO) and lower Fe (∼2.6 wt.% FeO) contents near the edge compared to inner portions, reflecting the evolution of the pegmatite melt via simple fractional crystallization. Other crystals show a complex zoning pattern of oscillations in Fe and Zn contents within the crystal and higher Zn and lower Fe near the rim compared to the core. A plot of molecular Fe2+ + Mg versus Zn + Mn yields a strong negative correlation and best displays the substitutions within the gahnite crystal structure and is the best to determine relative pegmatite melt evolution. Without implying a co-magmatic origin of the pegmatites, based on pegmatite mineralogy, Zn contents, Zn/Fe2+ ratios, and coupled Fe2++Mg and Zn+Mn values in gahnite, the relative degree of evolution of the pegmatites increases in the order: Sin Nombre → Magdalena → Juan Román → Blanca Dora → Nancy → La Ona. Based on the composition of gahnite in worldwide granitic pegmatites reported in the literature and those obtained here, the composition of gahnite in these rocks is defined by the endmember ranges Ghn50–98Hc1–50Spl0–7. This study shows that the major element composition of gahnite in granitic pegmatites can effectively be used to determine the relative degree of evolution of pegmatite-forming melts. Fil: Heimann, Adriana. East Carolina University; Estados Unidos Fil: Yonts, Jason A.. East Carolina University; Estados Unidos Fil: Galliski, Miguel Angel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mendoza. Instituto Argentino de Nivología, Glaciología y Ciencias Ambientales. Provincia de Mendoza. Instituto Argentino de Nivología, Glaciología y Ciencias Ambientales. Universidad Nacional de Cuyo. Instituto Argentino de Nivología, Glaciología y Ciencias Ambientales; Argentina |
| description |
Gahnite from LCT granitic pegmatites of the Comechingones (Blanca Dora, Juan Román, Magdalena, La Ona, and Sin Nombre pegmatites) and Conlara (Nancy pegmatite) pegmatite districts, Argentina, was analyzed to investigate the relationship between its chemistry, pegmatite mineralogy, and pegmatite melt evolution. Based on the molecular proportions of endmembers (gahnite, hercynite, spinel, and galaxite) the composition of gahnite in these pegmatites is defined by the ranges Ghn77.7– 91.0Hc7.4–20.0Spl0.25–3.37Glx0.7–2.4, which fall within the previously defined field for granitic pegmatites. Gahnite from the Nancy pegmatite has higher Mg and Mn contents than gahnite from the pegmatites of the Comechingones pegmatite district. Chemical variation within gahnite crystals is characterized by higher Zn (∼2.8 wt.% ZnO) and lower Fe (∼2.6 wt.% FeO) contents near the edge compared to inner portions, reflecting the evolution of the pegmatite melt via simple fractional crystallization. Other crystals show a complex zoning pattern of oscillations in Fe and Zn contents within the crystal and higher Zn and lower Fe near the rim compared to the core. A plot of molecular Fe2+ + Mg versus Zn + Mn yields a strong negative correlation and best displays the substitutions within the gahnite crystal structure and is the best to determine relative pegmatite melt evolution. Without implying a co-magmatic origin of the pegmatites, based on pegmatite mineralogy, Zn contents, Zn/Fe2+ ratios, and coupled Fe2++Mg and Zn+Mn values in gahnite, the relative degree of evolution of the pegmatites increases in the order: Sin Nombre → Magdalena → Juan Román → Blanca Dora → Nancy → La Ona. Based on the composition of gahnite in worldwide granitic pegmatites reported in the literature and those obtained here, the composition of gahnite in these rocks is defined by the endmember ranges Ghn50–98Hc1–50Spl0–7. This study shows that the major element composition of gahnite in granitic pegmatites can effectively be used to determine the relative degree of evolution of pegmatite-forming melts. |
| publishDate |
2015 |
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2015-12 |
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info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion http://purl.org/coar/resource_type/c_6501 info:ar-repo/semantics/articulo |
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article |
| status_str |
publishedVersion |
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http://hdl.handle.net/11336/182845 Heimann, Adriana; Yonts, Jason A.; Galliski, Miguel Angel; The composition of gahnite in granitic pegmatites from the Pampean Pegmatite Province, Argentina: Implications for pegmatite fractionation; Mineralogical Association of Canada; Canadian Mineralogist; 53; 6; 12-2015; 991-1013 0008-4476 1499-1276 CONICET Digital CONICET |
| url |
http://hdl.handle.net/11336/182845 |
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Heimann, Adriana; Yonts, Jason A.; Galliski, Miguel Angel; The composition of gahnite in granitic pegmatites from the Pampean Pegmatite Province, Argentina: Implications for pegmatite fractionation; Mineralogical Association of Canada; Canadian Mineralogist; 53; 6; 12-2015; 991-1013 0008-4476 1499-1276 CONICET Digital CONICET |
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eng |
| language |
eng |
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info:eu-repo/semantics/altIdentifier/doi/10.3749/canmin.1400100 info:eu-repo/semantics/altIdentifier/url/https://pubs.geoscienceworld.org/canmin/article/53/6/991/521457/The-Composition-of-Gahnite-in-Granitic-Pegmatites |
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openAccess |
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Mineralogical Association of Canada |
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Mineralogical Association of Canada |
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CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicas |
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dasensio@conicet.gov.ar; lcarlino@conicet.gov.ar |
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