Serpentinites and serpentinites within a fossil subduction channel: La Corea mélange, eastern Cuba
A variety of metaultramafic (serpentinite) rocks in La Corea mélange, Sierra de Cristal, eastern Cuba, show differences in chemical, textural and mineralogical characteristics demonstrating a variety of protoliths. The mélange originated during the Cretaceous as part of the subduction channel associ...
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| Format: | Article |
| Language: | English |
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Universitat de Barcelona (UB), Geociències Barcelona (Geo3BCN), Institut de Diagnosi Ambiental i Estudis de l'Aigua (IDAEA), Universitat Autònoma de Barcelona (UAB)
2011-11-01
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| Series: | Geologica Acta |
| Subjects: | |
| Online Access: | https://revistes.ub.edu/index.php/GEOACTA/article/view/3708 |
| _version_ | 1797654575494201344 |
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| author | I.F. BLANCO QUINTERO J.A. PROENZA FERNANDEZ A. GARCÍA CASCO E. TAULER S. GALÉ MEDINA |
| author_facet | I.F. BLANCO QUINTERO J.A. PROENZA FERNANDEZ A. GARCÍA CASCO E. TAULER S. GALÉ MEDINA |
| author_sort | I.F. BLANCO QUINTERO |
| collection | DOAJ |
| description | A variety of metaultramafic (serpentinite) rocks in La Corea mélange, Sierra de Cristal, eastern Cuba, show differences in chemical, textural and mineralogical characteristics demonstrating a variety of protoliths. The mélange originated during the Cretaceous as part of the subduction channel associated with the Caribbean island arc. This mélange contains high pressure blocks in a serpentinite matrix and occurs at the base of the large tabular Mayarí-Cristal ophiolite. Two principal groups of serpentinites have been identified in the mélange: a) antigorite serpentinite, mainly composed of antigorite and b) antigorite-lizardite serpentinite, composed of mixtures of antigorite and lizardite and bearing distinctive porphyroblasts of diopsidic clinopyroxene. Antigorite serpentinites are closely related to tectonic blocks of amphibolite (representing subducted MORB) and constitute deep fragments of the serpentinitic subduction channel formed during hydration of the mantle wedge. The composition of the antigorite-lizardite serpentinites and the presence of clinopyroxene porphyroblasts in this type of rock suggest that abyssal lherzolite protoliths transformed into serpentinite before and during incorporation (as tectonic blocks) in the shallow part of the subduction channel. Although the studied rocks have different origin, mineralogical compositions and textures, they display similar PGE compositions, suggesting that these elements experienced no significant redistribution during metamorphism. Both types of serpentinites were exposed together in the La Corea mélange during the Late Cretaceous, during obduction of the overriding Mayarí-Baracoa ophiolitic belt that led to exhumation of the subduction channel (mélange) |
| first_indexed | 2024-03-11T17:01:30Z |
| format | Article |
| id | doaj.art-9fa9c328b87a4777b2e63068537c523e |
| institution | Directory Open Access Journal |
| issn | 1696-5728 |
| language | English |
| last_indexed | 2024-03-11T17:01:30Z |
| publishDate | 2011-11-01 |
| publisher | Universitat de Barcelona (UB), Geociències Barcelona (Geo3BCN), Institut de Diagnosi Ambiental i Estudis de l'Aigua (IDAEA), Universitat Autònoma de Barcelona (UAB) |
| record_format | Article |
| series | Geologica Acta |
| spelling | doaj.art-9fa9c328b87a4777b2e63068537c523e2023-10-20T07:20:48ZengUniversitat de Barcelona (UB), Geociències Barcelona (Geo3BCN), Institut de Diagnosi Ambiental i Estudis de l'Aigua (IDAEA), Universitat Autònoma de Barcelona (UAB)Geologica Acta1696-57282011-11-0193-4Serpentinites and serpentinites within a fossil subduction channel: La Corea mélange, eastern CubaI.F. BLANCO QUINTERO0J.A. PROENZA FERNANDEZ1A. GARCÍA CASCO2E. TAULER3S. GALÉ MEDINA4Departamento de Mineralogía y Petrología, Universidad de Granada Fuentenueva s/n, 18002-Granada, SpainDepartament de Cristal·lografia, Mineralogia i Dipòsits Minerals, Facultat de Geologia, universitat de Barcelona (UB). Martí i Franquès s/n, 08028-Barcelona, SpainDepartamento de Mineralogía y Petrología, Universidad de Granada Fuentenueva s/n, 18002-Granada, Spain. Instituto andaluz de Ciencias de la tierra (CSIC-uGr). Fuentenueva s/n, 18002-Granada, SpainDepartament de Cristal·lografia, Mineralogia i Dipòsits Minerals, Facultat de Geologia, universitat de Barcelona (UB). Martí i Franquès s/n, 08028-Barcelona, SpainDepartament de Cristal·lografia, Mineralogia i Dipòsits Minerals, Facultat de Geologia, universitat de Barcelona (UB). Martí i Franquès s/n, 08028-Barcelona, SpainA variety of metaultramafic (serpentinite) rocks in La Corea mélange, Sierra de Cristal, eastern Cuba, show differences in chemical, textural and mineralogical characteristics demonstrating a variety of protoliths. The mélange originated during the Cretaceous as part of the subduction channel associated with the Caribbean island arc. This mélange contains high pressure blocks in a serpentinite matrix and occurs at the base of the large tabular Mayarí-Cristal ophiolite. Two principal groups of serpentinites have been identified in the mélange: a) antigorite serpentinite, mainly composed of antigorite and b) antigorite-lizardite serpentinite, composed of mixtures of antigorite and lizardite and bearing distinctive porphyroblasts of diopsidic clinopyroxene. Antigorite serpentinites are closely related to tectonic blocks of amphibolite (representing subducted MORB) and constitute deep fragments of the serpentinitic subduction channel formed during hydration of the mantle wedge. The composition of the antigorite-lizardite serpentinites and the presence of clinopyroxene porphyroblasts in this type of rock suggest that abyssal lherzolite protoliths transformed into serpentinite before and during incorporation (as tectonic blocks) in the shallow part of the subduction channel. Although the studied rocks have different origin, mineralogical compositions and textures, they display similar PGE compositions, suggesting that these elements experienced no significant redistribution during metamorphism. Both types of serpentinites were exposed together in the La Corea mélange during the Late Cretaceous, during obduction of the overriding Mayarí-Baracoa ophiolitic belt that led to exhumation of the subduction channel (mélange)https://revistes.ub.edu/index.php/GEOACTA/article/view/3708SerpentiniteSubduction ChannelLa Corea MélangeCubaCaribbean |
| spellingShingle | I.F. BLANCO QUINTERO J.A. PROENZA FERNANDEZ A. GARCÍA CASCO E. TAULER S. GALÉ MEDINA Serpentinites and serpentinites within a fossil subduction channel: La Corea mélange, eastern Cuba Geologica Acta Serpentinite Subduction Channel La Corea Mélange Cuba Caribbean |
| title | Serpentinites and serpentinites within a fossil subduction channel: La Corea mélange, eastern Cuba |
| title_full | Serpentinites and serpentinites within a fossil subduction channel: La Corea mélange, eastern Cuba |
| title_fullStr | Serpentinites and serpentinites within a fossil subduction channel: La Corea mélange, eastern Cuba |
| title_full_unstemmed | Serpentinites and serpentinites within a fossil subduction channel: La Corea mélange, eastern Cuba |
| title_short | Serpentinites and serpentinites within a fossil subduction channel: La Corea mélange, eastern Cuba |
| title_sort | serpentinites and serpentinites within a fossil subduction channel la corea melange eastern cuba |
| topic | Serpentinite Subduction Channel La Corea Mélange Cuba Caribbean |
| url | https://revistes.ub.edu/index.php/GEOACTA/article/view/3708 |
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