Cone sheet formation and intrusive growth of an oceanic island—The Miocene Tejeda complex on Gran Canaria (Canary Islands)

Abstract

Research Article| March 01, 1999 Cone sheet formation and intrusive growth of an oceanic island—The Miocene Tejeda complex on Gran Canaria (Canary Islands) Carsten Schirnick; Carsten Schirnick 1GEOMAR Forschungszentrum, Wischhofstrasse 1-3, D-24148 Kiel, Germany Search for other works by this author on: GSW Google Scholar Paul van den Bogaard; Paul van den Bogaard 1GEOMAR Forschungszentrum, Wischhofstrasse 1-3, D-24148 Kiel, Germany Search for other works by this author on: GSW Google Scholar Hans-Ulrich Schmincke Hans-Ulrich Schmincke 1GEOMAR Forschungszentrum, Wischhofstrasse 1-3, D-24148 Kiel, Germany Search for other works by this author on: GSW Google Scholar Author and Article Information Carsten Schirnick 1GEOMAR Forschungszentrum, Wischhofstrasse 1-3, D-24148 Kiel, Germany Paul van den Bogaard 1GEOMAR Forschungszentrum, Wischhofstrasse 1-3, D-24148 Kiel, Germany Hans-Ulrich Schmincke 1GEOMAR Forschungszentrum, Wischhofstrasse 1-3, D-24148 Kiel, Germany Publisher: Geological Society of America First Online: 02 Jun 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (1999) 27 (3): 207–210. https://doi.org/10.1130/0091-7613(1999)027<0207:CSFAIG>2.3.CO;2 Article history First Online: 02 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Carsten Schirnick, Paul van den Bogaard, Hans-Ulrich Schmincke; Cone sheet formation and intrusive growth of an oceanic island—The Miocene Tejeda complex on Gran Canaria (Canary Islands). Geology 1999;; 27 (3): 207–210. doi: https://doi.org/10.1130/0091-7613(1999)027<0207:CSFAIG>2.3.CO;2 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGeology Search Advanced Search Abstract More than 500 trachytic to phonolitic cone sheet dikes, hypabyssal syenite stocks, and subordinate radial dikes form a 20-km-diameter intrusive complex in the volcaniclastic fill of the Miocene Tejeda caldera (20 × 35 km) on Gran Canaria (Canary Islands). The dikes intruded concentrically around a central axis of radial symmetry and dip uniformly an average of ∼41° toward the center. Single-crystal 40Ar/39Ar ages of dikes and syenite stocks ranging from 12.3 ± 0.1 to 7.32 ± 0.05 Ma suggest more or less continuous intrusive activity during both volcanically active and inactive phases. Intrusions were emplaced at average intervals of ∼5–10 k.y., while explosive eruptions took place at >50 k.y. intervals. The estimated aggregate volume of evolved cone sheet magma added at shallow level (<2000 m below sea level) amounts to ∼250 km3 compared to ⋙500 km3 of evolved extrusive volcanics erupted during the same period.Formation of the Tejeda cone sheets most likely resulted from deformation processes due to resurgent doming, initiated by the recurrent replenishment of a flat, laccolith-like shallow magma chamber. Magma supply exceeding the volume that could be compensated for by updoming of the overlying caldera fill resulted in the formation of cone-shaped fractures. This content is PDF only. Please click on the PDF icon to access. First Page Preview Close Modal You do not have access to this content, please speak to your institutional administrator if you feel you should have access.