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• W2006775594 abstract "This paper contains informations of two kinds: (1) observation on the effects of high-temperatures annealing on the organization of opaline radiolarian test that may simulate fossilization processes and (2) an hypothetical model for the processes of formation, preservation and destruction of radiolarian shells in geologic history, based on diverse published reports and observations of heat-treated skeletons. Biomineralization of radiolarian skeletons start with an appearance of some primary amorphous opal globulesE (0.06–0.15 μm) on the hexagonal polysaccharide plates of the organic matrix. The finest globulesE are grouped together, forming the globule unitsD (0.2–03 μm), which, in their turn, are united into a globule unitC (0.4–1 μm). The globule unitsC are grouped into the hexagonal prismatic unitsB (1–3 μm). The largest mineral unitsA (3–8 μm) are formed from the unitsB and pass throughout the whole shell wall. Besides that, every ultrastructural skeleton unit is surrounded by organic lamella. Therefore, the main tenent of biomineralization is corroborated: the existence of any skeleton as a single solid body is provided by the interactions of all ultrastructural skeleton elements through the unmineralized residual organic matrix. A common trend in the fossilization of skeletons is (1) destruction of the covering organic lamellae accompanied by disintegration of skeletons and (2) carbonization (tannage) of the residual organic matrix increasing a skeleton strength and silica transformation in the following successional: opal-opal-tridymite-tridymite-quartz. Initial stages of the secondary alteration of shells can be reconstructed by high-temperature annealing. As a result of experiment recent radiolarian tests were partially destroyed and showed increased pore sizes, thinning of shell wall and transformation of biogenic amorphous globules into opal-tridymite and even prismatic tridymite. The annealing of radiolarian tests from Early Permian outcrops show changing of pore sizes, cracking of skeletons along the largest ultrastructural units and besides that “guttering” of some primary globular shells and secondary crystallizing of others up to prismatic tridymite. Late Paleozoic radiolarians from deep drilling deposits can serve as an example of complete destruction of the carbonized organic lamellae, of an intergrowth of the mineral units and of substitution of prismatic low-temperature tridymite by dipyramidal-prismatic low-temperature quartz. Thus, modifications of SiO2 possible can show a response to corresponding stages of lithogenesis: sedimentogenesis-diagenesis-early catagenesis-late catagenesis." @default.
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• W2006775594 date "1990-03-01" @default.
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• W2006775594 title "Experimental evidence for changes during fossilization of radiolarian tests and implications for a model of biomineralization" @default.
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• W2006775594 doi "https://doi.org/10.1016/0377-8398(90)90013-c" @default.
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