...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...

... 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...

... 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...

... 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...

...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...

...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...

... 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...

...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...

...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...

...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...

...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...