Attempts of whole-rock K/Ar dating of mesozoic volcanic and hypabissal igneous rocks from the Central Subbetic (Southern Spain): A case of differential Argon loss related to very low-grade metamorphism
13 pages, 4 figures, 8 tables.
| Autores: | , , , |
|---|---|
| Tipo de recurso: | artículo |
| Fecha de publicación: | 1988 |
| País: | España |
| Institución: | Consejo Superior de Investigaciones Científicas (CSIC) |
| Repositorio: | DIGITAL.CSIC. Repositorio Institucional del CSIC |
| OAI Identifier: | oai:digital.csic.es:10261/23351 |
| Acceso en línea: | http://hdl.handle.net/10261/23351 |
| Access Level: | acceso abierto |
| Palabra clave: | Datación K/ Ar de rocas básicas Ofitas" Perdida de Ar Metaformisfo de muy bajo grado Cordilleras Béticas Zona Subbética K/ Ar dating of basic rocks Ophites Argon loss Very-low-grade metamorphism Betic Cordillera Subbetic zone |
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oai:digital.csic.es:10261/23351 |
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ES |
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España |
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| dc.title.none.fl_str_mv |
Attempts of whole-rock K/Ar dating of mesozoic volcanic and hypabissal igneous rocks from the Central Subbetic (Southern Spain): A case of differential Argon loss related to very low-grade metamorphism |
| title |
Attempts of whole-rock K/Ar dating of mesozoic volcanic and hypabissal igneous rocks from the Central Subbetic (Southern Spain): A case of differential Argon loss related to very low-grade metamorphism |
| spellingShingle |
Attempts of whole-rock K/Ar dating of mesozoic volcanic and hypabissal igneous rocks from the Central Subbetic (Southern Spain): A case of differential Argon loss related to very low-grade metamorphism Puga, E. Datación K/ Ar de rocas básicas Ofitas" Perdida de Ar Metaformisfo de muy bajo grado Cordilleras Béticas Zona Subbética K/ Ar dating of basic rocks Ophites Argon loss Very-low-grade metamorphism Betic Cordillera Subbetic zone |
| title_short |
Attempts of whole-rock K/Ar dating of mesozoic volcanic and hypabissal igneous rocks from the Central Subbetic (Southern Spain): A case of differential Argon loss related to very low-grade metamorphism |
| title_full |
Attempts of whole-rock K/Ar dating of mesozoic volcanic and hypabissal igneous rocks from the Central Subbetic (Southern Spain): A case of differential Argon loss related to very low-grade metamorphism |
| title_fullStr |
Attempts of whole-rock K/Ar dating of mesozoic volcanic and hypabissal igneous rocks from the Central Subbetic (Southern Spain): A case of differential Argon loss related to very low-grade metamorphism |
| title_full_unstemmed |
Attempts of whole-rock K/Ar dating of mesozoic volcanic and hypabissal igneous rocks from the Central Subbetic (Southern Spain): A case of differential Argon loss related to very low-grade metamorphism |
| title_sort |
Attempts of whole-rock K/Ar dating of mesozoic volcanic and hypabissal igneous rocks from the Central Subbetic (Southern Spain): A case of differential Argon loss related to very low-grade metamorphism |
| dc.creator.none.fl_str_mv |
Puga, E. Van de Fliert;, J. R. Torres-Roldán, R. L. Sanz de Galdeano, Carlos |
| author |
Puga, E. |
| author_facet |
Puga, E. Van de Fliert;, J. R. Torres-Roldán, R. L. Sanz de Galdeano, Carlos |
| author_role |
author |
| author2 |
Van de Fliert;, J. R. Torres-Roldán, R. L. Sanz de Galdeano, Carlos |
| author2_role |
author author author |
| dc.subject.none.fl_str_mv |
Datación K/ Ar de rocas básicas Ofitas" Perdida de Ar Metaformisfo de muy bajo grado Cordilleras Béticas Zona Subbética K/ Ar dating of basic rocks Ophites Argon loss Very-low-grade metamorphism Betic Cordillera Subbetic zone |
| topic |
Datación K/ Ar de rocas básicas Ofitas" Perdida de Ar Metaformisfo de muy bajo grado Cordilleras Béticas Zona Subbética K/ Ar dating of basic rocks Ophites Argon loss Very-low-grade metamorphism Betic Cordillera Subbetic zone |
| description |
13 pages, 4 figures, 8 tables. |
| publishDate |
1988 |
| dc.date.none.fl_str_mv |
1988 2010 2010 |
| dc.type.none.fl_str_mv |
info:eu-repo/semantics/article http://purl.org/coar/resource_type/c_6501 |
| format |
article |
| dc.identifier.none.fl_str_mv |
http://hdl.handle.net/10261/23351 |
| url |
http://hdl.handle.net/10261/23351 |
| dc.language.none.fl_str_mv |
Inglés |
| language_invalid_str_mv |
Inglés |
| dc.relation.none.fl_str_mv |
http://dx.doi.org/10.3989/egeol.88441-2523 |
| dc.rights.none.fl_str_mv |
info:eu-repo/semantics/openAccess |
| eu_rights_str_mv |
openAccess |
| dc.format.none.fl_str_mv |
9121869 bytes application/pdf |
| dc.publisher.none.fl_str_mv |
Consejo Superior de Investigaciones Científicas (España) |
| publisher.none.fl_str_mv |
Consejo Superior de Investigaciones Científicas (España) |
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reponame:DIGITAL.CSIC. Repositorio Institucional del CSIC instname:Consejo Superior de Investigaciones Científicas (CSIC) |
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Consejo Superior de Investigaciones Científicas (CSIC) |
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DIGITAL.CSIC. Repositorio Institucional del CSIC |
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DIGITAL.CSIC. Repositorio Institucional del CSIC |
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|
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|
| _version_ |
1869414218124492800 |
| spelling |
Attempts of whole-rock K/Ar dating of mesozoic volcanic and hypabissal igneous rocks from the Central Subbetic (Southern Spain): A case of differential Argon loss related to very low-grade metamorphismPuga, E.Van de Fliert;, J. R.Torres-Roldán, R. L.Sanz de Galdeano, CarlosDatación K/ Ar de rocas básicasOfitas"Perdida de ArMetaformisfo de muy bajo gradoCordilleras BéticasZona SubbéticaK/ Ar dating of basic rocksOphitesArgon lossVery-low-grade metamorphismBetic CordilleraSubbetic zone13 pages, 4 figures, 8 tables.[ES] Doce muestras de cuerpos básicos intrusivos en rocas triásicas («ofitas») y 11 muestras de volcanitas y rocas intrusivas asociadas en secuencias jurásico-cretáceas de la zona Subbética han sido objeto de datación radiométrica K/Ar (roca total) en combinación con análisis químico-petrográfico. Las edades analíticas obtenidas son 'sólo satisfactorias en relación con un cierto número de muestras de rocas volcánicas, no obstante, con una concordancia respecto de las edades estratigráficas en el orden del 10% relativo; las del resto, fundamentalmente muestras de «ofitas», presentan una fuerte dispersión, con diferencias que pueden alcanzar valores superiores a los 30 Ma, incluso en conjuntos provenientes del mismo afloramiento o localidad. Se concluye que las pérdidas de Ar causantes de los rejuvenecimientos de las edades analíticas observados son debidos a la existencia de transformaciones metamórficas alpinas, de muy bajo grado, que afectaron con mayor intensidad a las ofitas que a las rocas volcánicas presentes en niveles estratigráficos más altos. Otros cambios posteriores al emplazamiento magmático, tales como el grado de oxidación secundaria, son así mismo distintivos en ambos grupos de muestras al tiempo que proveen de soporte adicional al concepto de que el medio de alteración de las «ofitas» debió haber producido condiciones favorables a una interacción roca/fluidos más penetrativa y, por tanto, una recristalización más homogénea. En conjunto, la actividad magmática de la que derivaron las «ofitas» podría haber comenzado en el Trias terminal y continuado en el Jurásico Inferior. Tanto las «ofitas» como las volcanitas se consideran el resultado de eventos magmáticos ligados a movimientos de distensivos a transtensivos que afectaron a las cuencas externas de las Cordilleras Béticas desde el Trías terminal hasta el Cretáceo inferior.[EN] 12 samples of basic intrusives within Triassic rocks («ophites») and 11 samples of volcanic and associated intrusives within Jurassic to Early Cretaceous sequences of the Subbetic Zone were subjected to whole-rock K/Ar dating in combination with chemical/petrological analysis. Satisfactory results were obtained only from a number of samples of volcanic rocks, however, analytical ages commonly agree, within about 10 relative percent, with those deduced from stratigraphic location. «Ophite» samples, on the other hand, may reveal considerably lower analytic ages than the volcanics and show much stronger scattering, even among samples collected within a small ara. It is argued that the inferred loss of Ar results from very-low-grade alpine metamorphic alteration, which affected the «ophites>more intensely than the higher volcanic rocks. Other postemplacement chemical changes, such as the degree of secondary oxidation of Fe, are also distintive among the two groups of samples, and are to some extent consistent with the aboye view in that the alteration environment of the ophites should have produced conditions Cor more penetrative fluid-rock interactions and homogeneous recrystallization. Overall, the magmatic activity from which the ophitic rocks originated might have started in the Late Triassic and continued in the Lower Jurassic. 80th, the «ophites» and the volcanics are though to be the result oC magmatic events Collowing tensional to transtensive crustal movements affecting the external basins of the Betic Cordilleras Crom Late Triassic to Early Cretaceous times.Peer reviewedConsejo Superior de Investigaciones Científicas (España)201020101988info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_65019121869 bytesapplication/pdfhttp://hdl.handle.net/10261/23351reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)Ingléshttp://dx.doi.org/10.3989/egeol.88441-2523info:eu-repo/semantics/openAccessoai:digital.csic.es:10261/233512026-05-22T06:33:51Z |
| score |
15.812429 |