2001
DOI: 10.1306/2dc40964-0e47-11d7-8643000102c1865d
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Sedimentary Facies and Mineralogy of the Late Pleistocene Umukuri Silica Sinter, Taupo Volcanic Zone, New Zealand

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Cited by 108 publications
(150 citation statements)
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References 43 publications
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“…The most likely explanation is that, during the second cycle, silica precipitated at first within void spaces of the previous silica layer. This is consistent with natural examples where sinters have been observed to be more or completely cemented at depth, for example, from rim to spicule core ( Jones and Renaut, 2006) and top to bottom (Campbell et al, 2001). Silicification of cell biomass can occur from either particles preformed in suspension by homogeneous nucleation or by heterogeneous nucleation on cellular or inorganic surfaces.…”
supporting
confidence: 90%
See 1 more Smart Citation
“…The most likely explanation is that, during the second cycle, silica precipitated at first within void spaces of the previous silica layer. This is consistent with natural examples where sinters have been observed to be more or completely cemented at depth, for example, from rim to spicule core ( Jones and Renaut, 2006) and top to bottom (Campbell et al, 2001). Silicification of cell biomass can occur from either particles preformed in suspension by homogeneous nucleation or by heterogeneous nucleation on cellular or inorganic surfaces.…”
supporting
confidence: 90%
“…Similar degrees of heterogeneity are widely reported in natural sinters. For example, within the well-preserved late-Pleistocene Umuriki sinter (Taupo Volcanic Zone, New Zealand), Campbell et al (2001) identified three general silica fabrics. They included (i) a fine-grained porous and friable fabric, (ii) a dense vitreous fabric, and (iii) a more crystalline fabric.…”
Section: Simulation Of Evaporation-driven Sinter Formationmentioning
confidence: 99%
“…Mineralized Calothrix-dominated mats heavily influence the fabrics of low-to mid-temperature siliceous sinters forming distinctive hot-spring-associated rock formations (Walter, 1972;Cady and Farmer, 1996;Jones et al, 2001;Konhauser et al, 2001). The distinctive Calothrix biofacies have been instrumental in the interpretation of hot-spring paleoenvironments (Walter et al, 1996;Campbell et al, 2001;Jones and Renaut, 2003;Hugo et al, 2011). Microbial populations in Queen's Laundry Hot-Spring are exposed to circumneutral geothermal groundwater fluids that are saturated with dissolved silica resulting in a series of abiotic silicification reactions (Cady and Farmer, 1996;Benning et al, 2004).…”
Section: Introductionmentioning
confidence: 99%
“…Otro de los métodos discriminantes propuestos es el calentamiento a 1.050°C de la muestra durante 24 h, si se le realiza de nuevo una difracción y aparecen los picos más intensos o con forma ligeramente diferente, indicarían por tanto, que la fase es ópalo-C en lugar de cristobalita, que se mantendría inalterada al calentar, debido a que no experimenta procesos de deshidratación y subsecuente recristalización y aumento de tamaño. Tampoco la posición del pico de 4 Å es discriminatoria de que haya ópalo-CT y ópalo-C, sino que en todo caso indica la especie más abundante en la muestra (Campbell et al, 2001), de forma que cuando se obtienen valores de FMHM más anchos indica la presencia de ambas fases en la muestra.…”
Section: Análisis Por Difracción De Rayos X De Las Muestras Silíceasunclassified
“…El contacto de estos enclaves con el basalto estaba marcado por un descenso en el grado de cristalinidad, indicando por tanto que fue el magma el meca- (1) Elzea et al (1994). (2) Campbell et al, 2001. nismo de transporte hacia la superficie, esta característica era especialmente apreciable entre las areniscas donde además mostraban un contacto neto sin signos de asimilación. Dada la mineralogía y la textura que presentaban las muestras silíceas indicaban que en realidad representaban un proceso de alteración y/o reemplazamiento donde los componentes originales de la roca eran eliminados y sustituidos por otros más estables con las nuevas condiciones termodinámi-cas, de forma que no constituirían verdaderos enclaves.…”
Section: Procedencia De Las Muestrasunclassified