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37 results for “Dyke”
Figure 9 in Facies, origin, and palaeontological inventory of an Early Carboniferous neptunian dyke in the Devonian reef limestone near Rösenbeck (Brilon Anticline, Rhenish Mountains)
Figure 9. Schematic diagram illustrating the genesis of the dykes and their sediments in the Rösenbeck quarry. (a) Early Late Devonian: end of reef limestone sedimentation. (b) Late Devonian to Tournaisian: collapse of the carbonate platform, formation of fissures and dykes. (c) Late Tournaisian to Viséan: accumulation of carbonates on top of the reef ruin, widening of the dykes. (d) Late Viséan: begin of filling of the dykes by shales. (e) Latest Viséan to early Serpukhovian: transport of eroded sediment blocks from the top of the reef ruin into the dykes. (f) Serpukhovian to Recent: complete filling of the dykes with mud, erosion of the reef complex.
Figure 8 in Facies, origin, and palaeontological inventory of an Early Carboniferous neptunian dyke in the Devonian reef limestone near Rösenbeck (Brilon Anticline, Rhenish Mountains)
Figure 8. Chondrichthyan teeth from the Early Carboniferous dyke sediments of Rösenbeck. (a–c) Thrinacodus cf. gracia (Grogan and Lund, 2008). A, C, in lingual views, sample C; B, in lingual view, sample C. (d)?Squatinactis sp., in occlusal (D1), lingual (D2), and labial (D3) views, sample C. (e–j) Denaea cf. fournieri Pruvost, 1922, in lingual (E1, F1, G1, H2, I1, J1), occlusal (E2, F2, G2, I2, J2), and labial (E3, F3, G3, H1, I3) views, sample C. (k) Holocephali gen. et sp. indet. in lingual view, sample C. Scale bars: 0.4 mm.
Figure 7 in Facies, origin, and palaeontological inventory of an Early Carboniferous neptunian dyke in the Devonian reef limestone near Rösenbeck (Brilon Anticline, Rhenish Mountains)
Figure 7. Conodonts from the Early Carboniferous dyke sediments of Rösenbeck. (a) Gnathodus girtyi girtyi Haas, 1953, sample C. (b) Lochriea commutata (Branson and Mehl, 1941), sample C. (c) Lochriea nodosa (Bischoff, 1957), sample C. (d) Gnathodus praebilineatus Belka, 1985, sample E. (e) Gnathodus bilineatus Roundy, 1926, sample E. (f) "Gnathodus"homopunctatus (Ziegler, 1960), sample E. (g) Lochriea nodosa (Bischoff, 1957), sample F. (h) Gnathodus bilineatus Roundy, 1926, sample F. (i) Gnathodus girtyi girtyi Haas, 1953, sample F. (j) Gnathodus girtyi girtyi Haas, 1953, sample F. (k) Gnathodus bilineatus Roundy, 1926, sample H. (l) "Gnathodus"homopunctatus (Ziegler, 1960), sample H.
Figure 5 in Facies, origin, and palaeontological inventory of an Early Carboniferous neptunian dyke in the Devonian reef limestone near Rösenbeck (Brilon Anticline, Rhenish Mountains)
Figure 5. Carbonate microfacies of selected samples from the Rösenbeck quarry; all ×2. A – Middle Devonian reef limestone; B–F – Early Carboniferous dyke sediments. (a) Sample A: Stromatopora–Tabulata rudstone. Bioclast- and lithoclast-supported facies with fragments of stromatoporoids, tabulate corals (Thamnopora), and fragments of rugose corals and bivalves without preferred orientation. (b) Sample B: ammonoid packstone. Densely packed fragments of ammonoids within micritic matrix; some areas are filled with pseudosparite. Bioclast voids are filled with sparry calcite and displaying geopetal orientation. Ammonoids of various sizes from the initial stage (1 mm in diameter) up to 20 mm (but then fragmentary) are packed without preferred orientation. Numerous mollusc shell fragments (probably also mostly from ammonoids); less abundant are remains of ostracods, trilobites, and foraminifera. (c) Sample C: thin section with two successive carbonate facies. The lower part is a mollusc packstone with micritic matrix in which particularly small ammonoids up to 2 mm diameter are present; larger specimens are fragmented. Separated by a sharp boundary follows (in the upper part of the thin section) an ammonoid rudstone with densely packed ammonoids up to approximately 8 mm conch diameter. (d) Sample C: densely packed bioclastic and lithoclastic packstone with strongly fragmented mollusc shells and well-rounded clasts of phosphoritic nodules up to 10 mm length. Further biogens include ostracods, foraminifera, and conodonts. (e) Sample E: mollusc packstone with micritic matrix, which in some places is replaced by pseudosparite. Bioclast voids are filled with sparry calcite and show geopetal orientation. Most of the bioclasts are probably ammonoid shell remains; only one specimen is rather well preserved with internal whorls (Calygirtyoceras sp.). Further biogens are orthoconic cephalopods, ostracods, and trilobites. (f) Sample G: wackestone with occasionally occurring ammonoid conchs.
Figure 6 in Facies, origin, and palaeontological inventory of an Early Carboniferous neptunian dyke in the Devonian reef limestone near Rösenbeck (Brilon Anticline, Rhenish Mountains)
Figure 6. Stratigraphic column for the Viséan with the ammonoid stratigraphy and the presumed positions of the samples (timescale after Korn and Kaufmann, 2009).
Figure 4 in Facies, origin, and palaeontological inventory of an Early Carboniferous neptunian dyke in the Devonian reef limestone near Rösenbeck (Brilon Anticline, Rhenish Mountains)
Figure 4. Polished slab of sample E showing a breccia structure with various carbonate and phosphorite components; ×1.
Figure 2 in Facies, origin, and palaeontological inventory of an Early Carboniferous neptunian dyke in the Devonian reef limestone near Rösenbeck (Brilon Anticline, Rhenish Mountains)
Figure 2. Examples of neptunian dykes in the Middle Devonian limestone in the Rösenbeck quarry. (a) Funnel-shaped dyke largely filled with debris and mud. (b) Cave-like dyke filled with Early Carboniferous shales.
Figure 3 in Facies, origin, and palaeontological inventory of an Early Carboniferous neptunian dyke in the Devonian reef limestone near Rösenbeck (Brilon Anticline, Rhenish Mountains)
Figure 3. The position of the studied samples in the outcrop at the south-eastern margin of the limestone quarry. Sample A is from the top of the Middle Devonian reef limestone, and samples B to G are Early Carboniferous dyke sediments.
Figure 1 in Facies, origin, and palaeontological inventory of an Early Carboniferous neptunian dyke in the Devonian reef limestone near Rösenbeck (Brilon Anticline, Rhenish Mountains)
Figure 1. Geological map of the Brilon Syncline (after Bär, 1968) with the position of the Rösenbeck locality (marked by a star) at the eastern margin of the Brilon carbonate complex.
Text-fig. 1. Sketch map of the Devonian of the Prague Basin, and generalised stratigraphy of the Koněprusy Limestone (Pragian), Suchomasty Limestone (Upper Emsian), Acanthopyge Limestone (Eifelian) and the top of the Acanthopyge Limestone and the Srbsko Formation (transition Eifelian-Givetian) in the Koněprusy area (with marked neptunian dykes and approximate positions of Calceola-bearing limestone beds). Modified after Chlupáč et al. (1986), Hladil et al. (1992) and Mergl (2014). in Trilobite Assemblage Of Calceola -Bearing Beds In Acanthopyge Limestone (Choteč Formation, Middle Devonian, Eifelian, Prague Basin, The Czech Republic)
Text-fig. 1. Sketch map of the Devonian of the Prague Basin, and generalised stratigraphy of the Koněprusy Limestone (Pragian), Suchomasty Limestone (Upper Emsian), Acanthopyge Limestone (Eifelian) and the top of the Acanthopyge Limestone and the Srbsko Formation (transition Eifelian-Givetian) in the Koněprusy area (with marked neptunian dykes and approximate positions of Calceola-bearing limestone beds). Modified after Chlupáč et al. (1986), Hladil et al. (1992) and Mergl (2014).
Figure 5. Dorsal habitus, P in The Platycerus (Coleoptera, Lucanidae) of California, with the recognition of Platycerus cribripennis Van Dyke as a valid species
Figure 5. Dorsal habitus, P. oregonensis male.
Figure 4. Dorsal habitus, P in The Platycerus (Coleoptera, Lucanidae) of California, with the recognition of Platycerus cribripennis Van Dyke as a valid species
Figure 4. Dorsal habitus, P. marginalis male.
Figure 3. Dorsal habitus, P in The Platycerus (Coleoptera, Lucanidae) of California, with the recognition of Platycerus cribripennis Van Dyke as a valid species
Figure 3. Dorsal habitus, P. cribripennis male.
Anisotropy of magnetic susceptibility (AMS) and rock magnetic data for Pachmarhi dyke swarm of Deccan
<p>The Pachmarhi dyke swarms, situated in the Eastern part of the Narmada-Satpura-Tapi (N-S-T) dykes of the Deccan Continental Flood Basalt (DCFB), are studied using the Anisotropy of Magnetic Susceptibility (AMS) technique. Here, we determine the direction and sense of magma flow within the dykes to gain insights into the depth, number, and location of magma chambers, as well as the geodynamics of their plumbing system. Petrography and rock magnetism analyses revealed high-titanium magnetite particles, predominantly of Pseudo-Single Domain (PSD) nature, with a smaller proportion of Multi-Domain (MD) grains. We identified four distinct magnetic fabric types (I-IV) within the Pachmarhi dykes. The imbrication of magnetic foliation (for oblate fabric) and magnetic lineation (for prolate fabric) has been employed to discern the direction of magma flow which revealed multiple trends of magma flow, ranging from vertical/sub-vertical to inclined, with one particular dyke exhibiting lateral flow. The intersection of imbrication within the dyke margins provided valuable information about the presence of multiple shallow sub-crustal magma chambers which are supported by independent geophysical evidence and are similar to those of the Nandurbar-Dhule dyke swarms in the western region of the N-S-T dykes. Consequently, it can be inferred that the emplacement of dykes in the Pachmarhi region of the NSL, which were possible feeders to the late-stage Deccan volcanism, was primarily facilitated by a "polycentric flow" mechanism, wherein magma was injected vertically through shallow crustal fissures, potentially feeding into the late-stage Deccan flow units like Ambenali or Mahabaleshwar formation.</p>
Anisotropy of magnetic susceptibility (AMS) and rock magnetic data for Pachmarhi dyke swarm of Deccan
Open the record for dataset details and reuse information.
Supplementary data for: Carter, L.C., Williamson, B.J., Tapster, S.R. et al. Crystal mush dykes as conduits for mineralising fluids in the Yerington porphyry copper district, Nevada. Commun Earth Environ 2, 59 (2021). https://doi.org/10.1038/s43247-021-00128-4
<p>Supplementary data for Carter, L.C., Williamson, B.J., Tapster, S.R. <em>et al.</em> Crystal mush dykes as conduits for mineralising fluids in the Yerington porphyry copper district, Nevada. <em>Commun Earth Environ</em> <strong>2, </strong>59 (2021). https://doi.org/10.1038/s43247-021-00128-4</p> <p>The first .xlsx file contains data from EPMA and Total-IBA analyses</p> <p>The second .xlsx file contains QEMSCAN data.</p>
Distribution. SW Asia from Iraq and Iran to Afghanistan, Pakistan, India, Nepal, and Bhutan; also Bangladesh, Myanmar and S China (including Hainan I). Introduced to Antigua, Barbados, Beef Island, Buck Island, Carriacou, Croatia, Cuba, Fiji, French Guiana, Goat Island, Grenada, Guadeloupe, Guyana, Hawaii, Hispaniola, Jamaica, Japan, Jost Van Dyke, La Desirade, Lavango, Mafia (Tanzania), Marie Galante, Martinique, Maui, Mauritius, Molokai, Nevis, Oahu, Puerto Rico, St. Croix, St. John, St. Kitts, St. Lucia, St. Martin, St. Thomas, St. Vincent, Surinam, Tortola, Trinidad, Vieques, and Water Island. Introduction was unsuccessful in the Dominican Republic. The Small Indian Mongoose or the Javan Mongoose is said to occur on Hong Kong since the 1980s, and to have been also introduced to some Indonesian islands (particularly Ambon). in Herpestidae
Distribution. SW Asia from Iraq and Iran to Afghanistan, Pakistan, India, Nepal, and Bhutan; also Bangladesh, Myanmar and S China (including Hainan I). Introduced to Antigua, Barbados, Beef Island, Buck Island, Carriacou, Croatia, Cuba, Fiji, French Guiana, Goat Island, Grenada, Guadeloupe, Guyana, Hawaii, Hispaniola, Jamaica, Japan, Jost Van Dyke, La Desirade, Lavango, Mafia (Tanzania), Marie Galante, Martinique, Maui, Mauritius, Molokai, Nevis, Oahu, Puerto Rico, St. Croix, St. John, St. Kitts, St. Lucia, St. Martin, St. Thomas, St. Vincent, Surinam, Tortola, Trinidad, Vieques, and Water Island. Introduction was unsuccessful in the Dominican Republic. The Small Indian Mongoose or the Javan Mongoose is said to occur on Hong Kong since the 1980s, and to have been also introduced to some Indonesian islands (particularly Ambon).
FIGURES 17–19 in Redescription of the holotype of Bostrichoclerus bicornus Van Dyke, 1938, a rare species of the New World Tillinae Fauna (Coleoptera: Cleridae), with some taxonomic notes
FIGURES 17–19. Prosterna with procoxae removed of 17. Enoclerus zonatus (Klug), 18. Cymatodera sallei Gorham, 19. Labels of the holotype of B. bicornus, notice the abdomen attached to a cardboard piece.
FIGURES 14–16. 14 in Redescription of the holotype of Bostrichoclerus bicornus Van Dyke, 1938, a rare species of the New World Tillinae Fauna (Coleoptera: Cleridae), with some taxonomic notes
FIGURES 14–16. 14. Habitus of the specimen of B. bicornus collected in southern California, 15. Close-up of the frons in dorsal view, 16. Close-up of the frons in lateral view.
FIGURES 10–13. 10 in Redescription of the holotype of Bostrichoclerus bicornus Van Dyke, 1938, a rare species of the New World Tillinae Fauna (Coleoptera: Cleridae), with some taxonomic notes
FIGURES 10–13. 10. Mouthparts of the holotype of B. bicornus, 11. Pronotum in lateral view of the holotype of B. bicornus, 12. Protarsomeres in ventral view of the holotype of B. bicornus, 13. Protarsomeres in lateral view of the holotype of B. bicornus.
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