Is Quartz Cathodoluminescence Color a Reliable Provenance Tool? A Quantitative Examination

Boggs, Sam; Kwon, Young-Ihn; Goleš, Gordon G.; Rusk, Brian; Krinsley, David H.; Seyedolali, Abbas

doi:10.1306/102501720408

Cited by 82 publications

(37 citation statements)

References 16 publications

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“…The CL signal is similar to that of the 'prismatic cristobalite' (type 2, Fig. 5c), although quartz can also show a similar colour (Boggs et al 2002). Ultimately, the darker groundmass phase (by SEM-BSE) was confirmed as cristobalite using SEMRaman, which gave a broad, curved background pattern, typical of amorphous glass, with peaks that match the protruding into open pore space in MVO1406.…”

Section: Nature Of Crystalline Silica Phases In Dome Samplesmentioning

confidence: 65%

The nature and formation of cristobalite at the Soufrière Hills volcano, Montserrat: implications for the petrology and stability of silicic lava domes

et al. 2013

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Cristobalite is commonly found in the dome lava of silicic volcanoes but is not a primary magmatic phase; its presence indicates that the composition and micro-structure of dome lavas evolve during, and after, emplacement. Nine temporally and mineralogically diverse dome samples from the Soufrière Hills volcano (SHV), Montserrat, are analysed to provide the first detailed assessment of the nature and mode of cristobalite formation in a volcanic dome. The dome rocks contain up to 11 wt.% cristobalite, as defined by X-ray diffraction. Prismatic and platy forms of cristobalite, identified by scanning electron microscopy (SEM), are commonly found in pores and fractures, suggesting that they have precipitated from a vapour phase. Feathery crystallites and micro-crystals of cristobalite and quartz associated with volcanic glass, identified using SEM-Raman, are interpreted to have formed by varying amounts of devitrification. We discuss mechanisms of silica transport and cristobalite formation, and their implications for petrological interpretations and dome stability. We conclude: (1) that silica may be transported in the vapour phase locally, or from one part of the magmatic system to another; (2) that the potential for transport of silica into the dome should not be neglected in petrological and geochemical studies because the addition of non-magmatic phases may affect whole rock composition; and (3) that the extent of cristobalite mineralisation in the dome at SHV is sufficient to reduce porosity-hence, permeability-and may impact on the mechanical strength of the dome rock, thereby potentially affecting dome stability.

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Section: Nature Of Crystalline Silica Phases In Dome Samplesmentioning

confidence: 65%

The nature and formation of cristobalite at the Soufrière Hills volcano, Montserrat: implications for the petrology and stability of silicic lava domes

et al. 2013

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“…These elements are well known as coloration agents in mineral varieties as well as giving the multi-coloured bands and layers in our beryl sample. As these transition elements are present in various abundances in the beryl sample it should be assumed that the same rock forming elements, such as Al, Ca, Mg, K, Sr and Be elements have to be considered for the host rock identifications [21] since these elements are more active than the transition elements. The colours of natural and synthetic beryl (ideally Be 3 Al 2 Si 6 O 18 ) have been attributed either to the presence of chromophore ions partially replacing Al and/or Be (Cr 3 þ , Fe 2/3 þ , Mn 2 þ ) or to the occurrence of colour centres related to the presence of multi-atomic groups.…”

Section: Cathodoluminescencementioning

confidence: 99%

Luminescence behaviour of beryl (aquamarine variety) from Turkey

Katı¹,

Türemiş²,

Keski̇n³

et al. 2012

Journal of Luminescence

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“…Blue and red CL colours may indicate a magmatic and/or metamorphic origin. However, CL colour alone may not to be a reliable indicator for identifying the origin (and provenance) of detrital quartz grains (Boggs et al 2002). In conglomerates and medium-or coarsergrained sandstones, other components are visible, e.g.…”

Section: Geological Frameworkmentioning

confidence: 99%

Stability assessment of sandstones from the St. Servatius Church in Quedlinburg (UNESCO’s World Heritage Site, Germany)

Siegesmund¹,

Friedel

Vogel

et al. 2010

Environ Earth Sci

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The St. Servatius Church in Quedlinburg (UNESCO's World Heritage Site, Germany) is characterised by long-standing stability problems and structural damages, which have been known over the last several centuries. The monotonous Cretaceous sandstone with its poor lithification is considered to be the main factor. The sandstone is characterised by a high porosity of around 30 Vol.% (max. ca. 35 Vol.%) and a corresponding high wvalue. The porosity and the degree of cementation are responsible for the very low compressive strength of around 8 MPa at maximum, whereas under moisture these values are significantly reduced up to 40%. The freezethaw tests indicate a very poor resistance to frost weathering, which may explain the near-surface softening of the sandstone. Direct shear experiments with an approximate 60°angle of friction on the sandstone clearly demonstrate the safety margins. Initial geotechnical modelling does not favour the hypothesis that a landslide of the hill parallel to the southward dipping bedding planes (i.e. shear failure along weak zones) can occur. A prominent clay layer (also with a southward dip) below the entire castle hill is monitored to determine the possible amount of movement with respect to the geological discontinuities (e.g. joints, fractures). At present, a combination of foundation problems are being considered for the stability situation at the church. These include construction deficiencies due to deformation or softening of the foundation of the forerunner churches and missing or faulty connections from building additions. Geological factors responsible for the stability problems include the softening of the sandstone by the influence of weathering and penetrating water as well as the presence of possible shear planes and joints.

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Is Quartz Cathodoluminescence Color a Reliable Provenance Tool? A Quantitative Examination

Cited by 82 publications

References 16 publications

The nature and formation of cristobalite at the Soufrière Hills volcano, Montserrat: implications for the petrology and stability of silicic lava domes

The nature and formation of cristobalite at the Soufrière Hills volcano, Montserrat: implications for the petrology and stability of silicic lava domes

Luminescence behaviour of beryl (aquamarine variety) from Turkey

Stability assessment of sandstones from the St. Servatius Church in Quedlinburg (UNESCO’s World Heritage Site, Germany)

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