Structure, tectonics and metamorphic development of the Sancti Spiritus Dome (eastern Escambray massif, Central Cuba)
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| Formato: | Artículo científico |
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Universitat de Barcelona
2006
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| _version_ | 1876428369644486656 |
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| author | F. Grafe |
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| contents | Structure, tectonics and metamorphic development of the Sancti Spiritus Dome (eastern Escambray massif, Central Cuba) F. Grafe CH. Grevel A. Baumann K.P. Stanek W.V. Maresch Ciencias de la Tierra Tectonics Petrology Subduction Metamorphism Geochronology The Sancti Spiritus Dome of the eastern Escambray (Cuba) represents a metamorphic fold and thrust structurewhich was part of the Cretaceous subduction-accretion complex of the Greater Antillean Arc. On the basis ofstructural data and pressure-temperature-time evolution the metamorphic complex can be subdivided into fourunits interpretable as nappes: a high-grade greenschist-facies unit (Pitajones unit), a high-pressure tectonicmélange (Gavilanes unit), high-pressure amphibolites (Yayabo unit) and tectonically overlying - low-pressuremetagabbros of the Greater Antillean Arc (Mabujina unit). The oldest rock fabrics are preserved in eclogite- andblueschist-facies rocks of the Gavilanes unit, indicating arc-parallel extension. Maximum metamorphic conditionsare recorded in eclogites (16-20 kbar, 580-630 °C) and garnet-mica schists (16-23 kbar, 530-610 °C) ofthe Gavilanes unit. Field observations and fabric studies show that greenschist-facies dynamic indicators aredominated by top-to-NE tectonic transport in the lowermost nappes. The greenschist-facies shear zone betweenthe Yayabo unit and the Mabujina unit is viewed as the main detachment zone between the subduction complexand the overlying arc complex. Active subduction ceased at about 70 Ma, followed by rapid uplift, exhumationand thrusting to the north. 2006 artículo científico 1695-6133 https://www.redalyc.org/articulo.oa?id=50540208 en http://www.redalyc.org/revista.oa?id=505 Geologica Acta: an international earth science journal application/pdf Universitat de Barcelona Geologica Acta: an international earth science journal (España) Num.1-2 Vol.4 |
| format | Artículo científico |
| id | redalyc_50540208 |
| institution | Redalyc |
| language | en |
| publishDate | 2006 |
| publisher | Universitat de Barcelona |
| spellingShingle | Structure, tectonics and metamorphic development of the Sancti Spiritus Dome (eastern Escambray massif, Central Cuba) F. Grafe Ciencias de la Tierra Tectonics Petrology Subduction Metamorphism Geochronology Structure, tectonics and metamorphic development of the Sancti Spiritus Dome (eastern Escambray massif, Central Cuba) F. Grafe CH. Grevel A. Baumann K.P. Stanek W.V. Maresch Ciencias de la Tierra Tectonics Petrology Subduction Metamorphism Geochronology The Sancti Spiritus Dome of the eastern Escambray (Cuba) represents a metamorphic fold and thrust structurewhich was part of the Cretaceous subduction-accretion complex of the Greater Antillean Arc. On the basis ofstructural data and pressure-temperature-time evolution the metamorphic complex can be subdivided into fourunits interpretable as nappes: a high-grade greenschist-facies unit (Pitajones unit), a high-pressure tectonicmélange (Gavilanes unit), high-pressure amphibolites (Yayabo unit) and tectonically overlying - low-pressuremetagabbros of the Greater Antillean Arc (Mabujina unit). The oldest rock fabrics are preserved in eclogite- andblueschist-facies rocks of the Gavilanes unit, indicating arc-parallel extension. Maximum metamorphic conditionsare recorded in eclogites (16-20 kbar, 580-630 °C) and garnet-mica schists (16-23 kbar, 530-610 °C) ofthe Gavilanes unit. Field observations and fabric studies show that greenschist-facies dynamic indicators aredominated by top-to-NE tectonic transport in the lowermost nappes. The greenschist-facies shear zone betweenthe Yayabo unit and the Mabujina unit is viewed as the main detachment zone between the subduction complexand the overlying arc complex. Active subduction ceased at about 70 Ma, followed by rapid uplift, exhumationand thrusting to the north. 2006 artículo científico 1695-6133 https://www.redalyc.org/articulo.oa?id=50540208 en http://www.redalyc.org/revista.oa?id=505 Geologica Acta: an international earth science journal application/pdf Universitat de Barcelona Geologica Acta: an international earth science journal (España) Num.1-2 Vol.4 |
| title | Structure, tectonics and metamorphic development of the Sancti Spiritus Dome (eastern Escambray massif, Central Cuba) |
| topic | Ciencias de la Tierra Tectonics Petrology Subduction Metamorphism Geochronology |
| url | https://www.redalyc.org/articulo.oa?id=50540208 |