1-20 OF 521 RESULTS FOR

Kos Plateau

Results shown limited to content with bounding coordinates.
Save search
Follow your search
Access your saved searches in your account
Would you like to receive an alert when new items match your search?
Close Modal
Sort by
Journal Article

A reworked isolated deposit of the Kos Plateau Tuff and its significance for dating raised marine terraces, Kos, Greece Available to Purchase

David J.W. Piper, Georgia Pe-Piper
Published: 21 April 2020
Geological Magazine (2020) 157 (12): 2021–2032.
DOI: https://doi.org/10.1017/S0016756820000254
...David J.W. Piper; Georgia Pe-Piper Abstract The 161-ka Kos Plateau Tuff (KPT) eruption deposited widespread unwelded ignimbrites, but the Dikeos and Sympetro mountains on the SE of Kos Island blocked all but the most energetic pyroclastic flows. KPT remnants north of Sympetro mountain comprise...
FIGURES | View All (10)
View PDF for article title, A reworked isolated deposit of the <span class="search-highlight">Kos</span> <span class="search-highlight">Plateau</span> Tuff and its significance for dating raised marine terraces, <span class="search-highlight">Kos</span>, Greece
Purchase
Add to Citation Manager for A reworked isolated deposit of the <span class="search-highlight">Kos</span> <span class="search-highlight">Plateau</span> Tuff and its significance for dating raised marine terraces, <span class="search-highlight">Kos</span>, Greece
Journal Article

Zircon crystallization and recycling in the magma chamber of the rhyolitic Kos Plateau Tuff (Aegean arc) Available to Purchase

O. Bachmann, B.L.A. Charlier, J.B. Lowenstern
Journal: Geology
Published: 01 January 2007
Geology (2007) 35 (1): 73–76.
DOI: https://doi.org/10.1130/G23151A.1
...O. Bachmann; B.L.A. Charlier; J.B. Lowenstern Abstract In contrast to most large-volume silicic magmas in continental arcs, which are thought to evolve as open systems with significant assimilation of preexisting crust, the Kos Plateau Tuff magma formed dominantly by crystal fractionation of mafic...
FIGURES
View PDF for article title, Zircon crystallization and recycling in the magma chamber of the rhyolitic <span class="search-highlight">Kos</span> <span class="search-highlight">Plateau</span> Tuff (Aegean arc)
Purchase
Add to Citation Manager for Zircon crystallization and recycling in the magma chamber of the rhyolitic <span class="search-highlight">Kos</span> <span class="search-highlight">Plateau</span> Tuff (Aegean arc)
Image
The Kos Plateau Tuff (KPT); location shown on Figure 1. (Left) Generalized stratigraphic log of the Kos Plateau Tuff (KPT). Four eruptive phases (1–4) generated six major stratigraphic units: unit A is at the base, unit F is at the top. Phase 1 comprises Units A and B; phase 2 comprises units C and D; phase 3 comprises unit E; phase 4 comprises unit F. The units D, E and F are further subdivided as follows: unit D = lower (Dl), intermediate (Di) and main ignimbrite (Dm); unit E = the basal lithic breccia (Ebx), main ignimbrite (E) and the upper ignimbrite (Eu); unit F = pyroclastic density current deposit (Fs) and vitric ash (Ff). The lapilli grain scale letters f, m, and c stand for fine, medium and coarse. (Right) Photo of the most proximal KPT on central Kos, ~11 km from source, showing the thick lower units (A–D) of the KPT. The erosive boundary at the contact between Ebx and ignimbrite Dm was created during the eruption climax. Vertical section is ~15 m.

The Kos Plateau Tuff (KPT); location shown on F igure 1 . ( L eft ) Gene... Available to Purchase

Published: 01 June 2019
Figure 2. The Kos Plateau Tuff (KPT); location shown on F igure 1 . ( L eft ) Generalized stratigraphic log of the Kos Plateau Tuff (KPT). Four eruptive phases (1–4) generated six major stratigraphic units: unit A is at the base, unit F is at the top. Phase 1 comprises Units A and B; phase 2
Image
Isochron slopes and age distributions of zircons from Kos Plateau Tuff, Greece, showing presence of continuous age distributions. A) Model isochron slopes and corresponding 238U-230Th age distributions for granitoid xenoliths (top) and pumices (bottom). B) 238U-206Pb age distributions for granitoid xenoliths. Weighted U-Th mean ages are 228±14 ka (1σ; n = 70; MSWD = 1.08) and 194±10 ka (1σ; n = 74; MSWD = 1.6) for pumice and granitic clasts, respectively. Weighted U-Pb age is 213±5 (2σ; n = 33; MSWD = 17.8) for pumice and clasts combined. Eruption age of 161 ± 1 ka shown for reference. Based on Bachmann et al. (2007).

Isochron slopes and age distributions of zircons from Kos Plateau Tuff, Gre... Available to Purchase

Published: 01 January 2008
Figure 13. Isochron slopes and age distributions of zircons from Kos Plateau Tuff, Greece, showing presence of continuous age distributions. A) Model isochron slopes and corresponding 238 U- 230 Th age distributions for granitoid xenoliths (top) and pumices (bottom). B) 238 U- 206 Pb age
Journal Article

The Kos–Nisyros–Yali Volcanic Field Available to Purchase

Olivier Bachmann, Sharon R. Allen, Caroline Bouvet de Maisonneuve
Journal: Elements
Published: 01 June 2019
Elements (2019) 15 (3): 191–196.
DOI: https://doi.org/10.2138/gselements.15.3.191
...Figure 2. The Kos Plateau Tuff (KPT); location shown on F igure 1 . ( L eft ) Generalized stratigraphic log of the Kos Plateau Tuff (KPT). Four eruptive phases (1–4) generated six major stratigraphic units: unit A is at the base, unit F is at the top. Phase 1 comprises Units A and B; phase 2...
FIGURES | View All (5)
View PDF for article title, The <span class="search-highlight">Kos</span>–Nisyros–Yali Volcanic Field
Purchase
Add to Citation Manager for The <span class="search-highlight">Kos</span>–Nisyros–Yali Volcanic Field
Journal Article

Biotite as a recorder of an exsolved Li-rich volatile phase in upper-crustal silicic magma reservoirs Open Access

B.S. Ellis, J. Neukampf, O. Bachmann, C. Harris, F. Forni, T. Magna, O. Laurent, P. Ulmer
Journal: Geology
Published: 03 February 2022
Geology (2022) 50 (4): 481–485.
DOI: https://doi.org/10.1130/G49484.1
... increasing economic importance, the behavior of lithium (Li) in such environments remains poorly known. We illustrate how compositionally unusual biotites from the rhyolitic Bishop Tuff (California, USA) and Kos Plateau Tuff (Greece) may contain a magmatic volatile phase trapped between layers of biotite...
FIGURES | View All (4)
View PDF for article title, Biotite as a recorder of an exsolved Li-rich volatile phase in upper-crustal silicic magma reservoirs
Add to Citation Manager for Biotite as a recorder of an exsolved Li-rich volatile phase in upper-crustal silicic magma reservoirs
Journal Article

Synchrotron X-ray microtomography and lattice Boltzmann simulations of gas flow through volcanic pumices Open Access

Wim Degruyter, A. Burgisser, O. Bachmann, O. Malaspinas
Journal: Geosphere
Published: 01 October 2010
Geosphere (2010) 6 (5): 470–481.
DOI: https://doi.org/10.1130/GES00555.1
... compared to lab measurements of pumices produced by the Kos Plateau Tuff eruption to validate the method. New permeability data for pumices from other silicic volcanic deposits is presented, and an empirical model for permeability is tested using geometrical and topological data, i.e., tortuosity, specific...
FIGURES | View All (10)
View PDF for article title, Synchrotron X-ray microtomography and lattice Boltzmann simulations of gas flow through volcanic pumices
Add to Citation Manager for Synchrotron X-ray microtomography and lattice Boltzmann simulations of gas flow through volcanic pumices
Includes: Multimedia, Supplemental Content
Image
Biotite compositional and structural data. (A) Analytical totals of biotites shown against magnesium number [Mg# = 100 × molar Mg/(Mg + Fe)]. Literature data for the Caetano (Nevada, USA; Watts et al., 2016), Granadilla (Tenerife, Canary Islands; Bryan, 2006), and Kos (Greece; Bachmann, 2010) systems are shown for comparison in pale colors. NTB—normal-total biotite; LTB—low-total biotite; KPT—Kos Plateau Tuff. (B,C) Appearance of biotites from Astroni pyroclastics (Campi Flegrei, Italy) (NTB) and Kos Plateau Tuff (LTB) deposits illustrating different textures observed in backscattered electron imaging. (D) X-ray diffraction spectra of different biotites showing no other phases are included, with peak heights shown as arbitrary units (a.u.). Example biotite is sample R04144 from the RRUFF database (https://rruff.info).

Biotite compositional and structural data. (A) Analytical totals of biotite... Open Access

Published: 03 February 2022
; Bachmann, 2010 ) systems are shown for comparison in pale colors. NTB—normal-total biotite; LTB—low-total biotite; KPT—Kos Plateau Tuff. (B,C) Appearance of biotites from Astroni pyroclastics (Campi Flegrei, Italy) (NTB) and Kos Plateau Tuff (LTB) deposits illustrating different textures observed
Image
Lithium contents of biotites and coexisting groundmass glasses. (A) Biotite compositions from low-total biotites (LTBs) showing highly enriched Li contents (note logarithmic scale). Campi Flegrei (Italy) data are from this study and Forni et al. (2018). KPT—Kos Plateau Tuff. (B) Groundmass glasses illustrating that LTBs do not coexist with strongly Li-enriched melts. The field of Snake River Plain (SRP; western North America) glasses in gray from Ellis et al. (2021) indicates typical Li contents of rhyolitic glasses. Also shown in pale colors are melt inclusion compositions from the Bishop Tuff (Dunbar and Hervig, 1992; Wallace et al., 1999; Myers et al., 2019) and Kos Plateau Tuff (Bachmann et al., 2009).

Lithium contents of biotites and coexisting groundmass glasses. (A) Biotite... Open Access

Published: 03 February 2022
Figure 2. Lithium contents of biotites and coexisting groundmass glasses. (A) Biotite compositions from low-total biotites (LTBs) showing highly enriched Li contents (note logarithmic scale). Campi Flegrei (Italy) data are from this study and Forni et al. (2018) . KPT—Kos Plateau Tuff. (B
Image
Map of the Kos–Nisyros–Yali volcanic field (Greece) highlighting the extent and distribution of volcanic deposits produced prior to, during, and after the paroxysmal caldera-forming eruption of the Kos Plateau Tuff (KPT). Distribution of the volcanic deposits is after Allen and McPhie (2001), Pe-Piper et al. (2005), and Dietrich and Lagios (2018); bathymetry is from EMODnet; black dashed-lines indicate major faults (see Lagios et al. 2005); white rectangle on Kos outlines the area shown in Figure 2. (inset) Map showing the location of the Hellenic trench and the Kos–Nisyros–Yali volcanic field within the Southern Aegean volcanic arc.

Map of the Kos–Nisyros–Yali volcanic field (Greece) highlighting the extent... Available to Purchase

Published: 01 June 2019
Figure 1. Map of the Kos–Nisyros–Yali volcanic field (Greece) highlighting the extent and distribution of volcanic deposits produced prior to, during, and after the paroxysmal caldera-forming eruption of the Kos Plateau Tuff (KPT). Distribution of the volcanic deposits is after Allen and McPhie
Image
Evolution of the Kos–Nisyros–Yali volcanic field (see Fig. 1), illustrating a possibly cyclic trend with the reconstruction of a large upper crustal reservoir bearing cool and oxidized, high-SiO2 rhyolite akin to the KPT magma. 1. Early magmatic history with the production mafic to intermediate magmas erupted at Pachia and Pyrgousa. 2. Evolution to more silicic magma compositions erupted in Kefalos. 3. Growth of a large, volatile-rich, silicic magma reservoir at the origin of the paroxysmal caldera-forming eruption (highlighted with the yellow star). 4. Gradual re-growth of a reservoir and differentiation of magmas erupted in Nisyros and Yali. Abbreviations are as follows: BA = Basaltic-Andesites; KPT = Kos Plateau Tuff; AM = Agios Mammas dome; PCD = Post-Caldera Domes of Nisyros.

Evolution of the Kos–Nisyros–Yali volcanic field (see F ig . 1 ), illustra... Available to Purchase

Published: 01 June 2019
and differentiation of magmas erupted in Nisyros and Yali. Abbreviations are as follows: BA = Basaltic-Andesites; KPT = Kos Plateau Tuff; AM = Agios Mammas dome; PCD = Post-Caldera Domes of Nisyros.
Image
A caldera cycle recorded by changes in temperature, oxygen fugacity, bulk-rock composition, and mineralogy in the Kos-Nisyros volcanic system, eastern Aegean. Pre-caldera units (Kefalos domes and pyroclastic units) show highly evolved magma compositions (high-SiO2 rhyolites), low temperature, oxidized, and water-rich conditions, similar to the caldera-forming event (Kos Plateau Tuff, KPT). Following the KPT, Nisyros volcano built up, generating more typically less evolved magmas, including two large rhyodacitic units (Lower Pumice and Upper Pumice), with drier, more reduced compositions, and hotter magma temperatures. Similar cycles have been suggested for the Taupo Volcanic Zone, in New Zealand (modified from Bachmann et al. 2012).

A caldera cycle recorded by changes in temperature, oxygen fugacity, bulk-r... Open Access

Published: 01 November 2016
temperature, oxidized, and water-rich conditions, similar to the caldera-forming event (Kos Plateau Tuff, KPT). Following the KPT, Nisyros volcano built up, generating more typically less evolved magmas, including two large rhyodacitic units (Lower Pumice and Upper Pumice), with drier, more reduced
Image
Lithium isotopic compositions. (A) Biotite (open symbols) and bulk-rock (filled symbols) δ7Li values showing extremely low δ7Li of low-total biotites (LTBs). NTB—normal-total biotite. Values in parentheses reflect Li abundance of sample. (B) Apparent partition coefficient (Kd) values calculated from dissolution inductively coupled plasma–mass spectrometry data showing the dramatic change in LTB samples. KPT—Kos Plateau Tuff.

Lithium isotopic compositions. (A) Biotite (open symbols) and bulk-rock (fi... Open Access

Published: 03 February 2022
) values calculated from dissolution inductively coupled plasma–mass spectrometry data showing the dramatic change in LTB samples. KPT—Kos Plateau Tuff.
Image
Bulk-rock evolution in Campi Flegrei (Italy) (A) and Kos-Nisyros (Greece) (B) systems, with symbol fill reflecting biotite occurrence. Larger symbols are samples from this study. Numbers reflect magmatic temperatures; in panel A, this is the lowest clinopyroxene-melt temperature (±20 °C), and in B, this is plagioclase-amphibole (±40 °C) or Fe-Ti oxide (±20 °C) thermometry with data from Bachmann et al. (2012), Forni et al. (2018), and Popa et al. (2019). Diamonds and dotted line in B illustrate experimental melt compositional evolution with experimental temperatures in black (“M and U experiments”; Marxer and Ulmer 2019) and biotite appearance at ~750 °C. Q—quartz, Or—orthoclase, Ab—albite, Ne—nepheline, Lc—leucite. (C) Rhyolite-MELTS models of systems with low-total biotite (LTB) and normal-total biotite (NTB) showing that in LTB systems, biotite predominantly crystallizes in the presence of magmatic volatile phase (MVP), while in NTB systems, it crystallizes mostly prior to exsolution of MVP. CI—Campanian Ignimbrite (Campi Flegrei, Italy); KPT—Kos Plateau Tuff (Greece); BT—Bishop Tuff (California, USA).

Bulk-rock evolution in Campi Flegrei (Italy) (A) and Kos-Nisyros (Greece) (... Open Access

Published: 03 February 2022
in the presence of magmatic volatile phase (MVP), while in NTB systems, it crystallizes mostly prior to exsolution of MVP. CI—Campanian Ignimbrite (Campi Flegrei, Italy); KPT—Kos Plateau Tuff (Greece); BT—Bishop Tuff (California, USA).
Image
Figure 2. Sensitive high-resolution ion microprobe–reverse geometry (SHRIMP-RG) U-Pb ages (and 2σ errors) on cores of zircons from Kos Plateau Tuff (2 pumices and 4 granitic inclusions from different stratigraphic levels in ignimbrite), showing age range in excess of analytical scatter (mean square of weighted deviates [MSWD] ≫ 1) of ca. 300 ka. All ages are corrected for initial radioactive disequilibrium in 230Th/238U using whole-rock values for Th/U melt composition (Appendix 3, see text footnote 1), 230Th/238U activity of 0.96, and 207Pb/206Pb from a Nisyros sample (0.834; Gülen, 1989).

Figure 2. Sensitive high-resolution ion microprobe–reverse geometry (SHRIMP... Available to Purchase

Published: 01 January 2007
Figure 2. Sensitive high-resolution ion microprobe–reverse geometry (SHRIMP-RG) U-Pb ages (and 2σ errors) on cores of zircons from Kos Plateau Tuff (2 pumices and 4 granitic inclusions from different stratigraphic levels in ignimbrite), showing age range in excess of analytical scatter (mean square
Image
Figure 3. Sensitive high-resolution ion microprobe–reverse geometry (SHRIMP-RG) U-Th data (and 1σ errors) on zircons from Kos Plateau Tuff (KPT) granitic inclusions and pumices. A: Rankorderplotsofmodel ages (slopes of two-point “isochrons”) showing an extensive range from around eruption age (given by single-grain sanidine 40Ar/39Ar age; Smith et al., 1996) to the equiline (older than 350 ka). B: U-Th isochron plots (calculated with Isoplot; Ludwig, 2003) for same data sets (pumices and granitic inclusions) going through whole-rock U-Th values (see Table 1 of Appendix 3 [see text footnote 1]). MSWD—mean square of weighted deviates.

Figure 3. Sensitive high-resolution ion microprobe–reverse geometry (SHRIMP... Available to Purchase

Published: 01 January 2007
Figure 3. Sensitive high-resolution ion microprobe–reverse geometry (SHRIMP-RG) U-Th data (and 1σ errors) on zircons from Kos Plateau Tuff (KPT) granitic inclusions and pumices. A: Rankorderplotsofmodel ages (slopes of two-point “isochrons”) showing an extensive range from around eruption age
Image
(a) Oxygen isotope mineral pair temperature calculations for hot-dry Yellowstone-Snake River Plain (YSRP) and Icelandic rhyolites, and (b) the Bishop, Fish Canyon, Toba, Cerro Galan, lower Bandelier, and Kos Plateau Tuffs, shown along-side zircon saturation temperatures (references for compiled data in Table 1). (c) Calculated mineral-melt oxygen isotope fractionation curves at different temperatures, with peak probability values plotted from kernel density estimates of each mineral from hot-dry and cold-wet rhyolites. In hot-dry YSRP and Iceland rhyolites, temperatures calculated with magnetite and clinopyroxene are generally very similar, with the median quartz-magnetite 50 °C higher than quartz-clinopyroxene where both minerals are analyzed in the same sample. The median quartz-zircon is 70 °C lower than quartz-clinopyroxene. In cold-wet rhyolites, temperatures for all three minerals are lower and remarkably similar. The average quartz-clinopyroxene is ~50 °C higher (~810 °C) than quartz-magnetite and quartz-zircon (~760 °C). Again, zircon saturation temperatures are very similar, and almost 100 °C lower than in hot-dry rhyolites. We note that two YSRP deposits, the Lava Creek Tuff member A (LCT-A) and the lower Arbon Valley Tuff (AVT), return similar temperatures to the cold-wet type rhyolites. These two units are the only YSRP units that we have analyzed with hydrous minerals, biotite (bio) and hornblende (hbl), and are the earliest deposits from their respective eruptive sequences.

( a ) Oxygen isotope mineral pair temperature calculations for hot-dry Yell... Available to Purchase

Published: 01 May 2016
Figure 1 ( a ) Oxygen isotope mineral pair temperature calculations for hot-dry Yellowstone-Snake River Plain (YSRP) and Icelandic rhyolites, and ( b ) the Bishop, Fish Canyon, Toba, Cerro Galan, lower Bandelier, and Kos Plateau Tuffs, shown along-side zircon saturation temperatures (references
Journal Article

Oxygen isotope thermometry reveals high magmatic temperatures and short residence times in Yellowstone and other hot-dry rhyolites compared to cold-wet systems Available to Purchase

Matthew W. Loewen, Ilya N. Bindeman
Published: 01 May 2016
American Mineralogist (2016) 101 (5): 1222–1227.
DOI: https://doi.org/10.2138/am-2016-5591
...Figure 1 ( a ) Oxygen isotope mineral pair temperature calculations for hot-dry Yellowstone-Snake River Plain (YSRP) and Icelandic rhyolites, and ( b ) the Bishop, Fish Canyon, Toba, Cerro Galan, lower Bandelier, and Kos Plateau Tuffs, shown along-side zircon saturation temperatures (references...
FIGURES
View PDF for article title, Oxygen isotope thermometry reveals high magmatic temperatures and short residence times in Yellowstone and other hot-dry rhyolites compared to cold-wet systems
Purchase
Add to Citation Manager for Oxygen isotope thermometry reveals high magmatic temperatures and short residence times in Yellowstone and other hot-dry rhyolites compared to cold-wet systems
Journal Article

Volcanism of the South Aegean Volcanic Arc Available to Purchase

Georges E. Vougioukalakis, Christopher G. Satow, Timothy H. Druitt
Journal: Elements
Published: 01 June 2019
Elements (2019) 15 (3): 159–164.
DOI: https://doi.org/10.2138/gselements.15.3.159
... and may have impacted the Minoan civilization on the island of Crete. Kolumbo seamount, NE of Santorini, erupted in 1650, and its submarine caldera today hosts a high-temperature hydrothermal system and an associated diverse marine ecosystem. The huge pyroclastic flows of the Kos Plateau Tuff eruption...
FIGURES | View All (5)
View PDF for article title, Volcanism of the South Aegean Volcanic Arc
Purchase
Add to Citation Manager for Volcanism of the South Aegean Volcanic Arc
Image
Figure 12.

Geography and palaeogeography. (a) Present locations of the Khorat Plateau ... Available to Purchase

Published: 02 July 2015
the locations of the Khorat Plateau and the Napai Basin. Af – Afghanistan; Bo – Borneo; Bu – Burma; Inc – Indochina; Ko – Korea; Ma – Malaysia; NCh – North China; SCh – South China; St – Shan–Thai; Su – Sumatra; Ti – Tibet.