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glendonite

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Journal Article
Journal: GSA Bulletin
Published: 01 July 2017
GSA Bulletin (2017) 129 (7-8): 771–787.
...Stephen E. Grasby; Gennyne E. McCune; Benoit Beauchamp; Jennifer M. Galloway Abstract Dramatic global climate change in the Early Cretaceous suggests that numerous boreal cool events perturbed otherwise warm conditions. Abundant glendonites in Valanginian and Aptian strata are thought to be key...
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Journal Article
Journal: Geology
Published: 01 June 2017
Geology (2017) 45 (6): 575–576.
... maintained and the product is referred to as glendonite. Glendonite is consequently not a mineral but a pseudomorph of calcite after ikaite. Both ikaite and glendonite have been known for a long time, but the derivation of glendonite from ikaite was only confirmed after crystal aggregates of ikaite...
Journal Article
Journal: Geology
Published: 01 June 2017
Geology (2017) 45 (6): 503–506.
... warming events associated with major carbon cycle perturbations. Paradoxically, many of these extreme greenhouse episodes are preceded or followed by cold climate, perhaps even glacial conditions, as inferred from the occurrence of glendonites in high latitudes. Glendonites are pseudomorphs of ikaite...
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Journal Article
Published: 01 November 2007
Journal of Sedimentary Research (2007) 77 (11): 980–991.
...Bruce W. Selleck; Paul F. Carr; Brian G. Jones Abstract Calcite pseudomorphs after ikaite (glendonite) are associated with coldwater depositional systems, including glaciomarine and deepwater settings, as dictated by the limited stability field of ikaite. Ikaite precipitation is favored by elevated...
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Journal Article
Journal: GSA Bulletin
Published: 24 April 2019
GSA Bulletin (2019) 131 (11-12): 1979–1994.
... an anthropogenically-driven high- p CO 2 atmosphere. This study utilizes facies analysis to constrain the paleobathymetry of Lower Cretaceous glendonites—a pseudomorph after ikaite, a mineral that forms naturally at 7 °C or lower—from two paleo-high-latitude (60–70°N) sites in Svalbard, Arctic Norway, to infer global...
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Journal Article
Published: 01 November 2008
Journal of Sedimentary Research (2008) 78 (11): 713–723.
...Tracy D. Frank; Stephanie G. Thomas; Christopher R. Fielding Abstract Glendonites, calcite pseudomorphs after ikaite (CaCO 3 • 6H 2 O), feature prominently in fine-grained, glacially influenced Permian marine strata of eastern Australia, which accumulated in a series of extensional basins...
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Journal Article
Journal: Geology
Published: 01 February 2017
Geology (2017) 45 (2): 115–118.
... and paleobiological data are shaping current understanding of Ediacaran evolutionary and environmental history. Here, we report the occurrence of silicified glendonites in the Ediacaran Doushantuo Formation deposited in an inner-shelf environment on the South China block. Petrographic evidence suggests...
Journal Article
Journal: Geology
Published: 01 March 2010
Geology (2010) 38 (3): 251–254.
...Gregory D. Price; Elizabeth V. Nunn Abstract Oxygen and carbon isotope data from Cretaceous (Valanginian) glendonites and belemnites from Arctic Svalbard are presented. Oxygen isotope data from well-preserved glendonites, in conjunction with the ikaite to glendonite pseudomorph transition...
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Journal Article
Journal: Geology
Published: 01 January 2005
Geology (2005) 33 (1): 9–12.
...Noel P. James; Guy M. Narbonne; Robert W. Dalrymple; T. Kurtis Kyser Abstract Stellate crystals of ferroan dolomite in neritic siliciclastic and carbonate sedimentary rocks between Sturtian and Marinoan glaciations in the Mackenzie Mountains are interpreted as replaced glendonites...
FIGURES
Journal Article
Published: 01 September 2001
South African Journal of Geology (2001) 104 (3): 265–272.
...I. R. McLachlan; H. Tsikos; B. Cairncross Abstract Glendonites are carbonate pseudomorphs after monoclinic crystals of ikaite (calcium carbonate hexahydrate: CaCO 3 .6H 2 O). Ikaite forms at present within organic-rich marine or brackish sediments that are at near freezing temperatures...
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Image
Correlation of <b>glendonite</b> occurrence in Lower Cretaceous deposits from arou...
Published: 24 April 2019
Figure 7. Correlation of glendonite occurrence in Lower Cretaceous deposits from around the globe; adapted from Rogov et al. (2017) . Sources: Russia: Rogov et al. (2017) ; Svalbard, Norway: this study; Canadian Arctic (Queen Elizabeth Islands): Kemper and Schmitz (1975 , 1981) , Kemper
Image
Measured stratigraphic sections through <b>glendonite</b>-bearing horizons in the ...
Published: 01 July 2017
Figure 4. Measured stratigraphic sections through glendonite-bearing horizons in the Deer Bay (DB1) and Christopher Formations (CH1 and CH2) exposed on Ellef Ringnes Island (locations are shown in Fig. 3 ). Mudstone is subdivided on the basis of texture (related to silt content) and weathering
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Typical <b>glendonite</b> morphologies observed in the Deer Bay and Christopher Fo...
Published: 01 July 2017
Figure 7. Typical glendonite morphologies observed in the Deer Bay and Christopher Formations exposed on Ellef Ringnes Island, classified here as: (A–B) single crystal blades, (C–E) stellate, (F) rosette, and (G) pineapples. Images are at variable scales; the white bar in each image is 1 cm
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Average concentrations (ppm) of trace metals in bulk analyses of <b>glendonite</b>...
Published: 01 July 2017
Figure 9. Average concentrations (ppm) of trace metals in bulk analyses of glendonites, demonstrating that section CH2 samples contain substantially elevated concentrations.
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Macroscopic and microscopic views of <b>glendonite</b> specimens from Siberia (Rus...
in > Geology
Published: 01 June 2017
Figure 2. Macroscopic and microscopic views of glendonite specimens from Siberia (Russia). A,B: Medium-size stellate-shape glendonite; upper Pliensbachian, profile and transverse views, respectively. C,D: Succession of carbonate cements observed in glendonites (Ros—rosette oriented crystals; Rov
Image
Stratigraphic columns for <b>glendonite</b> localities in  Figure 1B . Stars mark ...
Published: 01 November 2008
Figure 2 Stratigraphic columns for glendonite localities in Figure 1B . Stars mark glendonite-bearing units sampled for the present study; diffuse shading marks glacially influenced deposits. Horizontal black bars P1–P4 mark duration of regionally recognized glacial epochs ( Fielding et al. 2008
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Common <b>glendonite</b> morphologies:  A)  Blade. Coin for scale (diameter = 2 cm...
Published: 01 November 2008
Figure 4 Common glendonite morphologies: A) Blade. Coin for scale (diameter = 2 cm), B) Rosette. Coin for scale (diameter = 3 cm), C) Stellate form. Coin for scale (diameter = 2 cm).
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Location map showing generalized geology and <b>glendonite</b> localities in the S...
Published: 01 November 2007
Figure 1 Location map showing generalized geology and glendonite localities in the Sydney Basin, New South Wales, Australia. Localities shown in nonmarine strata come from drill holes penetrating underlying marine units.
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Stable-isotope analyses of <b>glendonite</b> and transformed ikaite.
Published: 01 November 2007
Table 2 Stable-isotope analyses of glendonite and transformed ikaite.
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Stable-isotope analyses of <b>glendonite</b> and transformed ikaite.
Published: 01 November 2007
Table 2 Stable-isotope analyses of glendonite and transformed ikaite.