Giant Circumferential Dyke Swarms: Catalogue and Characteristics

Subsurface Geometry and Emplacement Conditions of a Giant Dike System in Elysium Fossae, Mars

“…If we consider other linear trough systems in the Elysium rise, again, such as Cerberus Fossae, (1) a result of dike intrusions and (2) part of the same swarm, then the length of said swarm would be of nearly 2,000 km. This also compares well with the maximum swarm lengths of 2,500 km in terrestrial swarms (Buchan & Ernst, 2019; Ernst et al., 1995, 2001). A detailed quantification of the thicknesses and lengths of individual dikes in both dolerite and Martian swarms would be needed to fully assess their resemblance, and specially, a characterization of the terrestrial dike heights in swarms.…”

“…The obtained widths for Elysium Fossae are between 10 and 353 m, with an average of 30 m. The majority of these are between 10 and 25 m, while most of terrestrial individual values collected show narrower dikes, between 1 and 15 m. Dike widths in dolerite dike swarms in cratonic areas, however, do show larger magnitudes which are comparable to the Elysium dikes. These dikes have widths frequently averaging between 20 and 45 m (Figure 10), and up to 500 m (Buchan & Ernst, 2019; Ernst et al., 1995a, 1995b, 2001). All original graben widths become dike widths of <100 m except in the case of structure 27, in which a 3,010 m graben width results into a modeled dike width of 353 m. The fault scarp at the location of this measurement is likely to have been altered by geomorphological processes which have overprinted the tectonic fabric.…”

Spatial and Temporal Distribution of Large Igneous Provinces in the Indian Shield – Highlights of Recent Investigations

“…Pathak et al (2017), on the basis of Virtual Geomagnetic Pole (VGP), obtained by palaeomagnetic measurements of 37 lava flows from the eastern Deccan Volcanic Province, and concluded that the eastern and western Deccan Traps were erupted for a shorter period close to the Cretaceous-Palaeogene boundary (KPB). Buchan and Ernst (2019) presented very exciting results on the different mafic dykes of the Deccan LIP and classified them as (i) radiating dykes and (ii) circumferential dykes; some other dykes, whose trends are not matching to radiating or circumferential swarms, are also reported. The radiating dyke swarm particularly belongs to the Narmada-Tapi, the West Coast, and the Saurashtra (Kathiawar) region subswarms.…”

“…8). Precise radiometric dating of mafic dykes belonging to both of these swarms is recommended for better understanding (Buchan and Ernst, 2019).…”

Geomagnetic Secular Variations at the Permian‐Triassic Boundary and Pulsed Magmatism During Eruption of the Siberian Traps

“…The Siberian Traps represent one of the largest continental igneous provinces on Earth, with a minimum total volume of 2–4 × 10 6 km 3 (Vasil'ev et al, ). The source of the Siberian Traps basalt was, probably, a mantle plume, the center of which was located in the southern Taymyr region under the focus of a coupled giant circumferential and radiating dyke swarm system (Buchan & Ernst, ). Siberian Traps magmatism was coeval with the Permian‐Triassic extinction, which occurred over 60 ± 48 ka between 251.941 ± 0.037 and 251.880 ± 0.031 Ma (Burgess et al, ).…”