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Koronos Unit

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Journal Article
Published: 28 April 2021
Journal of the Geological Society (2021) jgs2020-217.
... in the passive margin sequence of the Cycladic Blueschist Unit on Naxos Island, Greece, separates amphibolite facies, non-high-pressure rocks (Koronos Unit) below the shear zone from Eocene high-pressure rocks (Zas Unit) above the shear zone. We review existing pressure–temperature data from the Koronos Unit...
FIGURES | View All (9)
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Collection of photomicrographs from the <b>Koronos</b> <b>Unit</b> to demonstrate key mic...
Published: 04 June 2019
Figure 12. Collection of photomicrographs from the Koronos Unit to demonstrate key microstructures and fabrics during prograde and peak M 2 conditions. Mineral abbreviations follow Whitney and Evans (2010) . (A–C) 17TL110, a kyanite muscovite schist with coarse millimeter-sized kyanite blades
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REPRESENTATIVE QUANTITATIVE MINERAL ANALYSES FROM THE <b>KORONOS</b> <b>UNIT</b> SAMPLES ...
Published: 04 June 2019
TABLE 3. REPRESENTATIVE QUANTITATIVE MINERAL ANALYSES FROM THE KORONOS UNIT SAMPLES DERIVED FROM ELECTRON MICROPROBE
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Panorama and cross-section across Mount <b>Koronos</b> area, Naxos Island, showing...
Published: 02 April 2019
Fig. 10. Panorama and cross-section across Mount Koronos area, Naxos Island, showing the geometry of the folds, ductile shear zones and faults. (a) Infolded kyanite gneisses (green) and marbles (blue) of the Koronos Unit structurally overlying deepest-level kyanite- and sillimanite-migmatites
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Geological map of Naxos Island and two cross-sections, one E–W and the othe...
Published: 02 April 2019
Fig. 9. Geological map of Naxos Island and two cross-sections, one E–W and the other N–S, showing simplified geometry of the metamorphic core complex (after Lamont et al. 2019 ). Note upright folds in the kyanite- and sillimanite-grade core unit truncated by the overlying Koronos Shear Zone
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Tectonic model and simplified  P – T – t  paths for the formation of the Na...
Published: 02 April 2019
the Zas Unit). Stage 2 : Continued shortening and underplating resulting in crustal thickening and Barrovian metamorphism (kyanite-grade metamorphism; Koronos Unit). Stage 3 : Peak Barrovian metamorphism resulting in partial melting at the deepest structural levels. Stage 4 : Return ductile flow
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Structural map showing the trends of stretching lineations (Str m ) on a ma...
Published: 28 April 2021
Fig. 4. Structural map showing the trends of stretching lineations (Str m ) on a map (chloritoid and biotite isograds shown for reference) and ( a ) lower hemisphere stereographic projection. Also shown are the Carapace shear zone at the contact of the Core and Koronos units and the Mountsouna
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( a ) Geological/tectonic map of Naxos ( Jansen and Schuiling 1976 ;  Vande...
Published: 28 April 2021
Fig. 2. ( a ) Geological/tectonic map of Naxos ( Jansen and Schuiling 1976 ; Vanderhaeghe 2004 ; Kruckenberg et al. 2011 ) showing the proposed subdivision of the passive margin sequence into the lower non-high-P Koronos Unit and the upper high-P Zas Unit ( sensu   Lamont et al. 2019
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New geological map of Naxos metamorphic core complex, following previous ma...
Published: 04 June 2019
footwall include the Zas Unit (retrogressed Cycladic Blueschists), Koronos Unit (amphibolite-facies shelf carbonates), and Core Unit (upper-amphibolite-facies gneisses and migmatites). See text for more discussion and interpretation. Lines of sections A–A′, B–B′, C–C′, and D–D′ are presented in Figures 4
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Panoramic photos of folding styles on Naxos (color scheme: green—schist, bl...
Published: 04 June 2019
Figure 5. Panoramic photos of folding styles on Naxos (color scheme: green—schist, blue—marble, pink—gneiss, tan—migmatite, purple—amphibolite). (A) Google Earth imagery using three-dimensional (3-D) view mode to show an F 1 NE-SW–verging recumbent isoclinal fold within the Koronos Unit north
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Outcrop photographs. ( a ) ENE-dipping low-angle normal fault at Lionas sep...
Published: 28 April 2021
Fig. 5. Outcrop photographs. ( a ) ENE-dipping low-angle normal fault at Lionas separating mica schist of the alleged Koronos Unit below the normal fault from the Zas Unit above the fault. ( b ) Asymmetrical boudinage of isoclinally folded dolomitic marble layer in a calcareous schist. Note
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Summary of  P – T  paths as discussed in the text and  Table 1 . Note that ...
Published: 28 April 2021
Fig. 3. Summary of P – T paths as discussed in the text and Table 1 . Note that the proposed paths for the upper Koronos Unit ( Martin 2004 ) and the lower Zas Unit ( Peillod et al. 2021 ) are similar, with distinct isobaric heating at c. 10 kbar (37 km depth assuming an average rock
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Mesoscale annotated photographs of the folding geometries within the metamo...
Published: 04 June 2019
with “cat’s-eyes.” Stage 3—Rotation of principal stress axes causes late-stage E-W constriction to produce E-W–trending open to tight folds. KSZ—Koronos shear zone. See text for more discussion. (F–K) Lower-hemisphere equal-area stereonets of structural data from the Zas, Koronos, and Core Units: (F
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Mesoscale annotated photographs of the folding geometries within the metamo...
Published: 04 June 2019
with “cat’s-eyes.” Stage 3—Rotation of principal stress axes causes late-stage E-W constriction to produce E-W–trending open to tight folds. KSZ—Koronos shear zone. See text for more discussion. (F–K) Lower-hemisphere equal-area stereonets of structural data from the Zas, Koronos, and Core Units: (F
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Microphotographs of entire thin sections. In parts (a–c), almost the entire...
Published: 28 April 2021
Fig. 6. Microphotographs of entire thin sections. In parts (a–c), almost the entire thin section is shown, with the left-hand image in plane-polarized light (PPL) and the right-hand image in crossed-polarized light (XPL). ( a ) Sample NAX4 from the Koronos Unit showing a shear band fabric
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Calculated pressure-temperature ( P - T ) pseudosections for sample TL67 fr...
Published: 04 June 2019
Figure 18. Calculated pressure-temperature ( P - T ) pseudosections for sample TL67 from the Koronos Unit, using the observed bulk compositions, where compositional isopleths of grossular (Grs) and pyrope (Prp) for garnet are blue and red, respectively. (A) Calculated pseudosection for TL67
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Representative field outcrop photographs from intermediate levels of the Na...
Published: 04 June 2019
cleavages within micaceous schist from the Koronos Unit with S 3 C′ planes overprinting S 2 cleavage domains (36.932450°N, 25.429476°E). (C) Ultramafic partially serpentinized pod within host foliated amphibolite from the Main Ultramafic Horizon ( Katzir et al., 1999 , 2002 , 2007 ), directly
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Extrusion model to explain and visualize the sequence of deformation events...
Published: 04 June 2019
age data will be presented in a future study. Samples TL15, TL66, TL67, and TLN54 are approximately located, and their spatial evolution is illustrated as the model progresses. Stage 1—Pre–18 Ma: Prograde burial and metamorphism of the Koronos and Core Units forming F 1 isoclinal folds. Stage 2—Peak
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Three-dimensional models of the Naxos metamorphic core complex illustrating...
Published: 04 June 2019
Figure 4. Three-dimensional models of the Naxos metamorphic core complex illustrating structural and crosscutting relationships, produced using the QGIS plugin 2threejs with superimposed cross section, scale 1:1, using same color scheme for geological units as in Figure 3 . NPDS—Naxos-Paros
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Inferred tectonometamorphic evolution, schematically showing all the metamo...
Published: 28 April 2021
Fig. 9. Inferred tectonometamorphic evolution, schematically showing all the metamorphic units (Zas Unit at top, Koronos Unit and migmatitic Core Unit at bottom); note that we show the ‘alleged Zas shear zone’ for reference only as the reviewed P – T and structural data do not support its