figment
发表于 2025-3-27 00:57:27
Giant Circumferential Dyke Swarms: Catalogue and Characteristics,largest giant circumferential swarms have diameters comparable to the diameters postulated for the flattened heads of plumes that have risen from the core-mantle boundary, suggesting that they may be associated with the outer edge of a flattening or flattened mantle plume head. Smaller giant circumf
Graphite
发表于 2025-3-27 04:09:29
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大猩猩
发表于 2025-3-27 08:36:51
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桉树
发表于 2025-3-27 13:31:42
Intraplate Proterozoic Magmatism in the Amazonian Craton Reviewed: Geochronology, Crustal Tectonicss with synchronous lithosphere extension during the two time periods. The Avanavero (1.79 Ga) LIP event mostly consists of mafic dykes and sills which are intrusive into the Roraima platform cover, in the Guiana Shield. They show tholeiitic chemistry and similarities with E-MORB and subcontinental l
催眠
发表于 2025-3-27 13:52:53
Constraining the Chronology of the Mashishing Dykes from the Eastern Kaapvaal Craton in South Africhibole .Ar/.Ar plateau results, indicates that these four dykes predates the ~2.05 Ga Bushveld event. The six remaining dykes have similar chemistry to either the ~2.06 Ga Dullstroom Lavas (LDG), the 1.875–1.835 Ga Black Hills dyke swarm (LDH) or the ~1.11 Ga Umkondo dolerites (LDA, LDD, LDE and LDF
纯朴
发表于 2025-3-27 19:37:38
,New U–Pb Baddeleyite Ages of Mafic Dyke Swarms of the West African and Amazonian Cratons: Implicati sills in the Taoudeni basin. The last ones are related to the Central Atlantic Magmatic Province (CAMP) event. The Hounde swarm is oblique to the dominant radiating CAMP swarm and may be linked with the similar-trending elongate Kakoulima intrusion in Guinea. In addition, the N150° Käyser swarm (Am
天赋
发表于 2025-3-28 00:53:38
Spatial and Temporal Distribution Patterns of Mafic Dyke Swarms in Central Asia: Results from Remotsia, and is intended to provide basic preparation for more in-depth studies in the future. In Enhanced Thematic Mapper Plus (bands 7, 4, and 2) images, major mafic dykes (greater than 5 m wide) displayed as dark-colored linear objects against their host rocks, and can be distinguished and plotted on
Needlework
发表于 2025-3-28 03:31:37
,Neoarchean-Mesoproterozoic Mafic Dyke Swarms of the Indian Shield Mapped Using Google Earth™ Imagesn shield and their matches with coeval LIPs on other crustal blocks suggest connections of the Indian shield within known supercontinents, such as Kenorland/Superia (~2.75–2.07 Ga), Columbia/Nuna (1.90–1.38 Ga), and Rodinia (1.20–0.72 Ga). However, further detailed U–Pb geochronology and associated
Kernel
发表于 2025-3-28 08:33:46
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Neutral-Spine
发表于 2025-3-28 13:15:43
Geochemistry, Petrogenesis and Tectonic Significance of the Proterozoic Mafic Dykes from the Bomdil0.15–16.42) ratios indicate that these rocks were probably derived from an enriched lithospheric mantle source due to varying degrees of partial melting and subsequently the melt was modified by fractional crystallization of olivine, pyroxene and plagioclase rather than crustal contamination. Origin