Topic
Cone sheet
About: Cone sheet is a research topic. Over the lifetime, 50 publications have been published within this topic receiving 1681 citations.
Papers
1 Jan 1937
TL;DR: A system of intrusions of the type now known as cone-sheets was first definitely recognized and mapped by Harker in the Cuillin district of Skye, and was described by him in the Geological Survey memoir issued in 1904 as discussed by the authors.
Abstract: A System of intrusions of the type now known as cone-sheets was first definitely recognized and mapped by Harker in the Cuillin district of Skye, and was described by him in the Geological Survey memoir issued in 1904. The members of the complex were simply designated “inclined sheets,” but they incline inwards towards a common centre from north, west, south, and south-east. When the Scottish Survey undertook the mapping of Mull, in the years preceding the war, two further series of centrally inclined intrusions were soon recognized. Owing to the number of these sheets, and consequent liability to confusion, individual members can seldom be traced very far, or shown to have arcuate curvature. But the systems as a whole sweep round centres in continuous curves. In one case the curve was originally closed, though it has been somewhat interrupted by later intrusions. In the other case the main body of sheets only forms a horse-shoe. Nevertheless the term cone-sheets, which was here applied to these intrusions by Professor Bailey, is extremely appropriate.
383 citations
TL;DR: In this article, the authors reviewed the explanations of the formation of radial dykes, ring dykes and cone sheets and found that they were unsatisfactory and suggested that the cone sheets occupied shear fractures formed as the result of dynamic stresses arising from the rapid expansion of a magma undergoing retrograde boiling.
117 citations
TL;DR: 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) as discussed by the authors.
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.
79 citations
Journal Article•
TL;DR: This article presented scaled laboratory experiments that reproduced dike and cone sheet intrusion geometries under controlled conditions, using Coulomb crystalline silica flour as the model rock and a molten vegetable oil injected at constant flow rate.
Abstract: Swarms of hundreds to thousands of igneous sheet intrusions represent the main magma pathways through the Earth’s brittle crust. Igneous sheet intrusions of various shapes, such as dikes and cone sheets, coexist as parts of complex volcanic plumbing systems likely fed by common sources. How they form is fundamental regarding volcanic hazards, but yet no dynamic model simulates and predicts satisfactorily their diversity. Here we present scaled laboratory experiments that reproduced dike and cone sheet intrusion geometries under controlled conditions (Galland et al., 2014). The model rock is fine-grained, cohesive Coulomb crystalline silica flour. The model magma is a molten vegetable oil injected at constant flow rate. After the experiments, the oil solidifies and the intrusion is excavated to observe its shape.
71 citations
TL;DR: The southwestern half of Gran Canaria probably represents the lower part of a large Tertiary volcano as discussed by the authors, and 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 calderas, and high level intrusion and resurgent doming of the central volcano's substructure by thick trachtic sills, a central syenite stock, and numerous trachyty cone sheets.
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.
63 citations
Related Topics (5)
Performance Metrics
| Year | Papers |
|---|---|
| 2020 | 1 |
| 2019 | 1 |
| 2017 | 1 |
| 2015 | 3 |
| 2014 | 5 |
| 2013 | 2 |