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The aim of this project is to clearly establish the origin of the different rock units that form part of the Basal Complexes of the Canary Islands, recognizable in Fuerteventura, La Gomera, and La Palma, and possibly in Tenerife. These units include sedimentary or volcanosedimentary rocks, submarine volcanic rocks of varied structure and composition, plutonic and hypabyssal complexes of different ages and natures, and swarms of dikes with very different geometries and significance. The conclusions obtained will allow the development of a model that will reveal the interrelationship between the processes of island formation, primarily the magmatic agent, the state of stress affecting the island structures (partly conditioned by the weight of the structures themselves), and the phenomena of sudden destruction represented by large gravitational landslides during the early stages of submarine formation and emergence of the Canary Islands. This model will improve existing knowledge about the early evolution of oceanic islands in intraplate environments. To achieve this objective, it will be necessary to study the petrological and geochemical characteristics of the earliest submarine and subaerial volcanic rocks on the four islands and of the corresponding cogenetic hypabyssal and subvolcanic complexes; examine the sedimentological characteristics of the associated volcaniclastic deposits and carry out the paleontological and biostratigraphic analysis of the micro- and macrofauna contained in the deposits interbedded within the submarine edifices; perform the sedimentological analysis of the materials resulting from the action of large gravitational landslides (debris avalanches, debris flows, hyperconcentrated flows, blasts, etc.) and attempt to establish the morphology and location of the resulting paleocalderas. In parallel, the tectonic evolution of the islands will be analyzed through the study of the structures affecting the Basal Complexes, in order to determine the characteristics and evolution of regional stress fields and their relative importance compared to other local stresses at each stage and location. The analysis will also address the distribution, geometry, and structure of the hypabyssal-subvolcanic complexes of the volcanic edifices. The expected results will also allow for the testing of various hypotheses regarding the origin and evolution of the Canary Archipelago and other oceanic islands located in similar geotectonic contexts. To this end, it will be necessary to study the interaction that exists over time between the regional stress state of the lithospheric plate and the dynamics of the asthenospheric mantle responsible for magmatism. Furthermore, the aim is to describe the possible cause-and-effect relationships between magmatism and the tectonic evolution of the island edifices, and between the sudden destruction of early submarine and subaerial edifices by means of large gravitational slides and the stress state to which the edifice is subjected. [/vc_column_text][/vc_tta_section][vc_tta_section title=»Abstract» tab_id=»abstract»][vc_column_text]
The project aim is to clearly establish the origin of the different rock associations forming part of the Basal Complexes of the Canary Islands (Fuerteventura, La Gomera, La Palma and, probably also in Tenerife). These associations comprise: sedimentary or volcanosedimentary rocks, submarine volcanic rocks with varied structures and compositions, plutonic and hypabyssal complexes of different age and nature and dyke swarms with a very varied geometry and meaning. The conclusions obtained will allow us to know the relationship between the insular building stages (mainly due to magmatic activity), the stress fields acting on the insular buildings (partly conditioned by their own weight) and the sudden episodes of destruction represented by large landslides during the early submarine growth and emersion of the Canary Islands. This model could be very useful to improve the current knowledge of the early evolution of oceanic islands in intraplate settings. To obtain this objective the petrological and geochemical features of the submarine and early subaerial volcanic rocks, as well as their cogenetic plutonic and subvolcanic complexes in these four islands will be studied. On the other hand, a sedimentological, palaeontological and biostratigraphic (macro and microfauna) characterization of the interbedded sediments in the submarine stage will be carried out. The sedimentological analyzes of the materials produced by large landslides (eg: debris-avalanches, debris-flows, hyperconcentrated flows, blast, etc) will also be necessary to perform. Resulting calderas will also be located and their morphology determined. At the same time, the analyzes of the tectonic evolution of the Islands through the study of the main structures affecting the Basal Complexes will allow characterizing the regional stress field evolution and to determine the relative significance of regional or local stress state during each stage. The analysis of the distribution, geometry and structural features of the subvolcanic buildings will also be carried out. The expected results will be taken into account to constrain the theories concerning the origin and evolution of the Canary Islands, which would be of interest for the study of other similar oceanic archipelagos around the world located at similar tectonic settings. For this, it will be necessary to analyze the interaction between the regional stress state of the lithospheric plate and the dynamics of the asthenospheric mantle responsible for magma generation. In addition, it is also planned to describe the potential cause-effect relationships between the magmatism and the tectonic evolution during the insular building periods, as well as the sudden events of destruction of the submarine and the early subaerial volcanoes by large gravitational slides and their relations.
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