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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
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
Published: 01 November 2001
American Mineralogist (2001) 86 (11-12): 1530–1533.
...Ian P. Swainson; Robert P. Hammond Abstract Neutron diffraction results are linked to the pre-diffraction, morphological crystallography of E.S. Dana to show that ikaite is the precursor of “glendonite” and “thinolite” and that some of the unusual features of the morphology can easily be explained...
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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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Stable-isotope data plot of <span class="search-highlight">glendonite</span> calcite and related materials. S bra...
Published: 01 November 2007
Figure 5 Stable-isotope data plot of glendonite calcite and related materials. S brach = brachiopods from Sydney Basin strata containing glendonites; S bulk = Sydney Basin bulk glendonite calcite; T bulk = Tasmania Basin bulk glendonite calcite; S amber = Sydney Basin glendonite amber-brown
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Photomicrographs (plane light) of <span class="search-highlight">glendonite</span> and associated sediment. Wandr...
Published: 01 November 2007
Figure 4 Photomicrographs (plane light) of glendonite and associated sediment. Wandrawandian Siltstone, Sydney Basin, NSW. A) Section of glendonite illustrating displacive growth of original ikaite crystal. Note abundant bioclasts. Scale in mm. B) Interior of glendonite illustrating darker
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Macroscopic and microscopic views of <span class="search-highlight">glendonite</span> specimens from Siberia (Rus...
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
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Measured stratigraphic sections through <span class="search-highlight">glendonite</span>-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
Image
A)  Stellate cluster of large <span class="search-highlight">glendonite</span> pseudomorphs in the Wandrawandian ...
Published: 01 November 2007
Figure 3 A) Stellate cluster of large glendonite pseudomorphs in the Wandrawandian Siltstone, Sydney Basin, New South Wales. B) "Pineapple" glendonite crystal array, Kola Peninsula. Scale in mm and cm.; C) Porous glendonite crystal array within concretion, Kola Peninsula. Note bivalve shell
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 2007
Journal of Sedimentary Research (2007) 77 (11): 980–991.
...Figure 5 Stable-isotope data plot of glendonite calcite and related materials. S brach = brachiopods from Sydney Basin strata containing glendonites; S bulk = Sydney Basin bulk glendonite calcite; T bulk = Tasmania Basin bulk glendonite calcite; S amber = Sydney Basin glendonite amber-brown...
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Journal Article
Journal: Geology
Published: 26 April 2022
Geology (2022)
...V.I. Davydov; I.V. Budnikov; R.V. Kutygin; N.G. Nurgalieva; A.S. Biakov; E.V. Karasev; A.N. Kilyasov; V.I. Makoshin Three intervals of glaciomarine diamictites with extensive glendonites in middle to upper Permian sediments were found in the Kobyume River, southern Verkhoyanie, Russia...
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Field photographs showing <span class="search-highlight">glendonites</span> in highly bioturbated, offshore facie...
Published: 01 November 2008
Figure 3 Field photographs showing glendonites in highly bioturbated, offshore facies of the Wandrawandian Siltstone in the southern Sydney Basin. A) Cross-sectional view of glendonite-bearing horizon showing randomly oriented, bladed forms in sandy mudstone. B) Bedding-plane view
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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Photomicrographs in plane-polarized light, showing the three main types of ...
Published: 01 July 2017
Figure 8. Photomicrographs in plane-polarized light, showing the three main types of calcite present in most glendonites. (A) Cross section through a glendonite showing the characteristic darker outer margin and inner blocky cement core. (B) Glendonite outer margin illustrating the primary
Journal Article
Published: 01 November 2008
Journal of Sedimentary Research (2008) 78 (11): 713–723.
...Figure 3 Field photographs showing glendonites in highly bioturbated, offshore facies of the Wandrawandian Siltstone in the southern Sydney Basin. A) Cross-sectional view of glendonite-bearing horizon showing randomly oriented, bladed forms in sandy mudstone. B) Bedding-plane view...
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Stable carbon and oxygen isotope compositions of <span class="search-highlight">glendonites</span> and brachiopod...
Published: 01 November 2008
Figure 7 Stable carbon and oxygen isotope compositions of glendonites and brachiopods from the Wandrawandian Siltstone. Also shown is the range of δ 13 C TOC values in glendonite-bearing sediments ( Birgenheier 2007 ).
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Correlation of <span class="search-highlight">glendonite</span> 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