Cone sheet swarm,resurgence of tejeda caldera,and the early geologic history of gran Canaria |
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| Authors: | H U Schmincke |
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| Institution: | 1. Mineralogisch-Petrographisches Institut, Laboratorium für Sedimentforschung, 69 Heidelberg, Berlinerstr. 19
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| Abstract: | The southwestern half of Gran Canaria probably represents the lower part of a large Tertiary volcano. The following stages in its development are recognized: alkali olivine basalt shield volcano; caldera collapse and emission of large quantities of alkali trachytic to soda rhyolitic ash flows; building of a central volcano inside the caldera, and high level intrusion and resurgent doming of the central volcano’s substructure by thick trachytic sills, a central syenite stock, and numerous trachytic cone sheets. The syenite stock and the younger cone sheet system inside the caldera suggest that two stages of doming followed caldera collapse. |
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