Nonporphyritic chondrules and chondrule fragments in enstatite chondrites: Insights into their origin and secondary processing
- Autores
- Varela, Maria Eugenia; Sylvester, P.; Brandstätter, F.; Engler, A.
- Año de publicación
- 2015
- Idioma
- inglés
- Tipo de recurso
- artículo
- Estado
- versión publicada
- Descripción
- Sixteen nonporphyritic chondrules and chondrule fragments were studied inpolished thin and thick sections in two enstatite chondrites (ECs): twelve objects fromunequilibrated EH3 Sahara 97158 and four objects from equilibrated EH4 Indarch. Bulkmajor element analyses, obtained with electron microprobe analysis (EMPA) and analyticalscanning electron microscopy (ASEM), as well as bulk lithophile trace element analyses,determined by laser ablation inductively coupled plasma?mass spectrometry (LA-ICP-MS),show that volatile components (K2O + Na2O versus Al2O3) scatter roughly around the CIline, indicating equilibration with the chondritic reservoir. All lithophile trace elementabundances in the chondrules from Sahara 97158 and Indarch are within the range ofprevious analyses of nonporphyritic chondrules in unequilibrated ordinary chondrites(UOCs). The unfractionated (solar-like) Yb/Ce ratio of the studied objects and the mostlyunfractionated refractory lithophile trace element (RLTE) abundance patterns indicate anorigin by direct condensation. However, the objects possess subchondritic CaO/Al2O3 ratios;superchondritic (Sahara 97158) and subchondritic (Indarch) Yb/Sc ratios; and chondriticnormalizeddeficits in Nb, Ti, V, and Mn relative to RLTEs. This suggests a unique nebularprocess for the origin of these ECs, involving elemental fractionation of the solar gas by theremoval of oldhamite, niningerite, and/or another phase prior to chondrule condensation. Alayered chondrule in Sahara 97158 is strongly depleted in Nb in the core compared to therim, suggesting that the solar gas was heterogeneous on the time scales of chondruleformation. Late stage metasomatic events produced the compositional diversity of thestudied objects by addition of moderately volatile and volatile elements. In the equilibratedIndarch chondrules, this late process has been further disturbed, possibly by apostaccretional process (diffusion?) that preferentially mobilized Rb with respect to Cs inthe studied objects.
Fil: Varela, Maria Eugenia. Consejo Nacional de Investigaciones Cientificas y Tecnicas. Centro Cientifico Tecnologico San Juan. Instituto de Ciencias Astronomicas de la Tierra y del Espacio; Argentina
Fil: Sylvester, P.. Memorial University Of Newfoundland; Canadá
Fil: Brandstätter, F.. Naturhistorisches Museum. Mineralogisch-Petrographische Abteilung; Austria
Fil: Engler, A.. University of Graz. Department of Mineralogy and Petrology. Institute of Earth Sciences; Austria - Materia
-
Condritas a Enstatita
Genesis
Nonphoryritic Chonrules
Secondary Processing - Nivel de accesibilidad
- acceso abierto
- Condiciones de uso
- https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
- Repositorio
- Institución
- Consejo Nacional de Investigaciones Científicas y Técnicas
- OAI Identificador
- oai:ri.conicet.gov.ar:11336/4889
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Nonporphyritic chondrules and chondrule fragments in enstatite chondrites: Insights into their origin and secondary processingVarela, Maria EugeniaSylvester, P.Brandstätter, F.Engler, A.Condritas a EnstatitaGenesisNonphoryritic ChonrulesSecondary Processinghttps://purl.org/becyt/ford/1.3https://purl.org/becyt/ford/1Sixteen nonporphyritic chondrules and chondrule fragments were studied inpolished thin and thick sections in two enstatite chondrites (ECs): twelve objects fromunequilibrated EH3 Sahara 97158 and four objects from equilibrated EH4 Indarch. Bulkmajor element analyses, obtained with electron microprobe analysis (EMPA) and analyticalscanning electron microscopy (ASEM), as well as bulk lithophile trace element analyses,determined by laser ablation inductively coupled plasma?mass spectrometry (LA-ICP-MS),show that volatile components (K2O + Na2O versus Al2O3) scatter roughly around the CIline, indicating equilibration with the chondritic reservoir. All lithophile trace elementabundances in the chondrules from Sahara 97158 and Indarch are within the range ofprevious analyses of nonporphyritic chondrules in unequilibrated ordinary chondrites(UOCs). The unfractionated (solar-like) Yb/Ce ratio of the studied objects and the mostlyunfractionated refractory lithophile trace element (RLTE) abundance patterns indicate anorigin by direct condensation. However, the objects possess subchondritic CaO/Al2O3 ratios;superchondritic (Sahara 97158) and subchondritic (Indarch) Yb/Sc ratios; and chondriticnormalizeddeficits in Nb, Ti, V, and Mn relative to RLTEs. This suggests a unique nebularprocess for the origin of these ECs, involving elemental fractionation of the solar gas by theremoval of oldhamite, niningerite, and/or another phase prior to chondrule condensation. Alayered chondrule in Sahara 97158 is strongly depleted in Nb in the core compared to therim, suggesting that the solar gas was heterogeneous on the time scales of chondruleformation. Late stage metasomatic events produced the compositional diversity of thestudied objects by addition of moderately volatile and volatile elements. In the equilibratedIndarch chondrules, this late process has been further disturbed, possibly by apostaccretional process (diffusion?) that preferentially mobilized Rb with respect to Cs inthe studied objects.Fil: Varela, Maria Eugenia. Consejo Nacional de Investigaciones Cientificas y Tecnicas. Centro Cientifico Tecnologico San Juan. Instituto de Ciencias Astronomicas de la Tierra y del Espacio; ArgentinaFil: Sylvester, P.. Memorial University Of Newfoundland; CanadáFil: Brandstätter, F.. Naturhistorisches Museum. Mineralogisch-Petrographische Abteilung; AustriaFil: Engler, A.. University of Graz. Department of Mineralogy and Petrology. Institute of Earth Sciences; AustriaWiley2015-08info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/4889Varela, Maria Eugenia; Sylvester, P.; Brandstätter, F.; Engler, A.; Nonporphyritic chondrules and chondrule fragments in enstatite chondrites: Insights into their origin and secondary processing; Wiley; Meteoritics & Planetary Science; 50; 8; 8-2015; 1338-13611086-9379enginfo:eu-repo/semantics/altIdentifier/url/http://onlinelibrary.wiley.com/doi/10.1111/maps.12468/abstractinfo:eu-repo/semantics/altIdentifier/doi/10.1111/maps.12468info:eu-repo/semantics/altIdentifier/doi/info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-29T09:37:11Zoai:ri.conicet.gov.ar:11336/4889instacron: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 09:37:12.048CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse |
dc.title.none.fl_str_mv |
Nonporphyritic chondrules and chondrule fragments in enstatite chondrites: Insights into their origin and secondary processing |
title |
Nonporphyritic chondrules and chondrule fragments in enstatite chondrites: Insights into their origin and secondary processing |
spellingShingle |
Nonporphyritic chondrules and chondrule fragments in enstatite chondrites: Insights into their origin and secondary processing Varela, Maria Eugenia Condritas a Enstatita Genesis Nonphoryritic Chonrules Secondary Processing |
title_short |
Nonporphyritic chondrules and chondrule fragments in enstatite chondrites: Insights into their origin and secondary processing |
title_full |
Nonporphyritic chondrules and chondrule fragments in enstatite chondrites: Insights into their origin and secondary processing |
title_fullStr |
Nonporphyritic chondrules and chondrule fragments in enstatite chondrites: Insights into their origin and secondary processing |
title_full_unstemmed |
Nonporphyritic chondrules and chondrule fragments in enstatite chondrites: Insights into their origin and secondary processing |
title_sort |
Nonporphyritic chondrules and chondrule fragments in enstatite chondrites: Insights into their origin and secondary processing |
dc.creator.none.fl_str_mv |
Varela, Maria Eugenia Sylvester, P. Brandstätter, F. Engler, A. |
author |
Varela, Maria Eugenia |
author_facet |
Varela, Maria Eugenia Sylvester, P. Brandstätter, F. Engler, A. |
author_role |
author |
author2 |
Sylvester, P. Brandstätter, F. Engler, A. |
author2_role |
author author author |
dc.subject.none.fl_str_mv |
Condritas a Enstatita Genesis Nonphoryritic Chonrules Secondary Processing |
topic |
Condritas a Enstatita Genesis Nonphoryritic Chonrules Secondary Processing |
purl_subject.fl_str_mv |
https://purl.org/becyt/ford/1.3 https://purl.org/becyt/ford/1 |
dc.description.none.fl_txt_mv |
Sixteen nonporphyritic chondrules and chondrule fragments were studied inpolished thin and thick sections in two enstatite chondrites (ECs): twelve objects fromunequilibrated EH3 Sahara 97158 and four objects from equilibrated EH4 Indarch. Bulkmajor element analyses, obtained with electron microprobe analysis (EMPA) and analyticalscanning electron microscopy (ASEM), as well as bulk lithophile trace element analyses,determined by laser ablation inductively coupled plasma?mass spectrometry (LA-ICP-MS),show that volatile components (K2O + Na2O versus Al2O3) scatter roughly around the CIline, indicating equilibration with the chondritic reservoir. All lithophile trace elementabundances in the chondrules from Sahara 97158 and Indarch are within the range ofprevious analyses of nonporphyritic chondrules in unequilibrated ordinary chondrites(UOCs). The unfractionated (solar-like) Yb/Ce ratio of the studied objects and the mostlyunfractionated refractory lithophile trace element (RLTE) abundance patterns indicate anorigin by direct condensation. However, the objects possess subchondritic CaO/Al2O3 ratios;superchondritic (Sahara 97158) and subchondritic (Indarch) Yb/Sc ratios; and chondriticnormalizeddeficits in Nb, Ti, V, and Mn relative to RLTEs. This suggests a unique nebularprocess for the origin of these ECs, involving elemental fractionation of the solar gas by theremoval of oldhamite, niningerite, and/or another phase prior to chondrule condensation. Alayered chondrule in Sahara 97158 is strongly depleted in Nb in the core compared to therim, suggesting that the solar gas was heterogeneous on the time scales of chondruleformation. Late stage metasomatic events produced the compositional diversity of thestudied objects by addition of moderately volatile and volatile elements. In the equilibratedIndarch chondrules, this late process has been further disturbed, possibly by apostaccretional process (diffusion?) that preferentially mobilized Rb with respect to Cs inthe studied objects. Fil: Varela, Maria Eugenia. Consejo Nacional de Investigaciones Cientificas y Tecnicas. Centro Cientifico Tecnologico San Juan. Instituto de Ciencias Astronomicas de la Tierra y del Espacio; Argentina Fil: Sylvester, P.. Memorial University Of Newfoundland; Canadá Fil: Brandstätter, F.. Naturhistorisches Museum. Mineralogisch-Petrographische Abteilung; Austria Fil: Engler, A.. University of Graz. Department of Mineralogy and Petrology. Institute of Earth Sciences; Austria |
description |
Sixteen nonporphyritic chondrules and chondrule fragments were studied inpolished thin and thick sections in two enstatite chondrites (ECs): twelve objects fromunequilibrated EH3 Sahara 97158 and four objects from equilibrated EH4 Indarch. Bulkmajor element analyses, obtained with electron microprobe analysis (EMPA) and analyticalscanning electron microscopy (ASEM), as well as bulk lithophile trace element analyses,determined by laser ablation inductively coupled plasma?mass spectrometry (LA-ICP-MS),show that volatile components (K2O + Na2O versus Al2O3) scatter roughly around the CIline, indicating equilibration with the chondritic reservoir. All lithophile trace elementabundances in the chondrules from Sahara 97158 and Indarch are within the range ofprevious analyses of nonporphyritic chondrules in unequilibrated ordinary chondrites(UOCs). The unfractionated (solar-like) Yb/Ce ratio of the studied objects and the mostlyunfractionated refractory lithophile trace element (RLTE) abundance patterns indicate anorigin by direct condensation. However, the objects possess subchondritic CaO/Al2O3 ratios;superchondritic (Sahara 97158) and subchondritic (Indarch) Yb/Sc ratios; and chondriticnormalizeddeficits in Nb, Ti, V, and Mn relative to RLTEs. This suggests a unique nebularprocess for the origin of these ECs, involving elemental fractionation of the solar gas by theremoval of oldhamite, niningerite, and/or another phase prior to chondrule condensation. Alayered chondrule in Sahara 97158 is strongly depleted in Nb in the core compared to therim, suggesting that the solar gas was heterogeneous on the time scales of chondruleformation. Late stage metasomatic events produced the compositional diversity of thestudied objects by addition of moderately volatile and volatile elements. In the equilibratedIndarch chondrules, this late process has been further disturbed, possibly by apostaccretional process (diffusion?) that preferentially mobilized Rb with respect to Cs inthe studied objects. |
publishDate |
2015 |
dc.date.none.fl_str_mv |
2015-08 |
dc.type.none.fl_str_mv |
info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion http://purl.org/coar/resource_type/c_6501 info:ar-repo/semantics/articulo |
format |
article |
status_str |
publishedVersion |
dc.identifier.none.fl_str_mv |
http://hdl.handle.net/11336/4889 Varela, Maria Eugenia; Sylvester, P.; Brandstätter, F.; Engler, A.; Nonporphyritic chondrules and chondrule fragments in enstatite chondrites: Insights into their origin and secondary processing; Wiley; Meteoritics & Planetary Science; 50; 8; 8-2015; 1338-1361 1086-9379 |
url |
http://hdl.handle.net/11336/4889 |
identifier_str_mv |
Varela, Maria Eugenia; Sylvester, P.; Brandstätter, F.; Engler, A.; Nonporphyritic chondrules and chondrule fragments in enstatite chondrites: Insights into their origin and secondary processing; Wiley; Meteoritics & Planetary Science; 50; 8; 8-2015; 1338-1361 1086-9379 |
dc.language.none.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
info:eu-repo/semantics/altIdentifier/url/http://onlinelibrary.wiley.com/doi/10.1111/maps.12468/abstract info:eu-repo/semantics/altIdentifier/doi/10.1111/maps.12468 info:eu-repo/semantics/altIdentifier/doi/ |
dc.rights.none.fl_str_mv |
info:eu-repo/semantics/openAccess https://creativecommons.org/licenses/by-nc-sa/2.5/ar/ |
eu_rights_str_mv |
openAccess |
rights_invalid_str_mv |
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/ |
dc.format.none.fl_str_mv |
application/pdf application/pdf |
dc.publisher.none.fl_str_mv |
Wiley |
publisher.none.fl_str_mv |
Wiley |
dc.source.none.fl_str_mv |
reponame:CONICET Digital (CONICET) instname:Consejo Nacional de Investigaciones Científicas y Técnicas |
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CONICET Digital (CONICET) |
collection |
CONICET Digital (CONICET) |
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Consejo Nacional de Investigaciones Científicas y Técnicas |
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CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicas |
repository.mail.fl_str_mv |
dasensio@conicet.gov.ar; lcarlino@conicet.gov.ar |
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1844613170938773504 |
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13.070432 |