Mineralogy, Geochemistry and Cathodoluminescence of Authigenic Quartz from Different Sedimentary Rocks

Götze, Jens

doi:10.1007/978-3-642-22161-3_13

Cited by 14 publications

(9 citation statements)

References 36 publications

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“…The most common CL emission bands in natural quartz were the 450 and 650 nm [64,65], which resulted in bluish-violet CL colors and were detectable in quartz crystals from igneous, volcanic, and metamorphic rocks as well as authigenic quartz from sedimentary environments. The resulting CL analysis (Figure 5a) appeared similar to the authigenic quartz found in the Zechstein salt deposit of the Triassic of Germany [66].…”

Section: Second Phase Of Quartz Formation: Quartz Overgrowthsupporting

confidence: 59%

Diagenetic Origin of Bipyramidal Quartz and Hydrothermal Aragonites within the Upper Triassic Saline Succession of the Iberian Basin: Implications for Interpreting the Burial–Thermal Evolution of the Basin

et al. 2020

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Within the Upper Triassic successions in the Iberian Basin (Spain), the occurrence of both idiomorphic bipyramidal quartz crystals as well as pseudohexagonal aragonite crystals are related to mudstone and evaporite bearing sequences. Bipyramidal-euhedral quartz crystals occur commonly at widespread locations and similar idiomorphic crystals have been described in other formations and ages from Europe, America, Pakistan, and Africa. Similarly, pseudohexagonal aragonite crystals are located at three main sites in the Iberian Range and are common constituents of deposits of this age in France, Italy, and Morocco. This study presents a detailed description of the geochemical and mineralogical characteristics of the bipyramidal quartz crystals to decipher their time of formation in relation to the diagenetic evolution of the sedimentary succession in which they formed. Petrographic and scanning electron microscopy (SEM) analyses permit the separation of an inner part of quartz crystals with abundant anhydrite and organic-rich inclusions. This inner part resulted from near-surface recrystallization (silicification) of an anhydrite nodule, at temperatures that were <40 °C. Raman spectra reveal the existence of moganite and polyhalite, which reinforces the evaporitic character of the original depositional environment. The external zone of the quartz contains no anhydrite or organic inclusions and no signs of evaporites in the Raman spectra, being interpreted as quartz overgrowths formed during burial, at temperatures between 80 to 90 °C. Meanwhile, the aragonite that appears in the same Keuper deposits was precipitated during the Callovian, resulting from the mixing of hydrothermal fluids with infiltrated waters of marine origin, at temperatures ranging between 160 and 260 °C based on fluids inclusion analyses. Although both pseudohexagonal aragonite crystals and bipyramidal quartz appear within the same succession, they formed at different phases of the diagenetic and tectonic evolution of the basin: bipyramidal quartz crystals formed in eo-to mesodiagenetic environments during a rifting period at Upper Triassic times, while aragonite formed 40 Ma later as a result of hydrothermal fluids circulating through normal faults.

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Section: Second Phase Of Quartz Formation: Quartz Overgrowthsupporting

confidence: 59%

Diagenetic Origin of Bipyramidal Quartz and Hydrothermal Aragonites within the Upper Triassic Saline Succession of the Iberian Basin: Implications for Interpreting the Burial–Thermal Evolution of the Basin

et al. 2020

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“…1b). These luminescence emissions are detectable in quartz crystals from magmatic and metamorphic rocks as well as authigenic quartz from sedimentary environments (Götze, 2012). In quartz of granites and granodiorites, the predominating 450 nm emission mostly causes visible CL colors in blue and violet, whereas quartz from volcanic rocks often shows zoning and violet-red CL due to a strong 650 nm emission (Fig.…”

Section: Cathodoluminescence Properties Of Selected Mineralsmentioning

confidence: 99%

Application of Cathodoluminescence Microscopy and Spectroscopy in Geosciences

Götze¹

2012

Microsc Microanal

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Cathodoluminescence (CL) microscopy and spectroscopy are luminescence techniques with widespread applications in geosciences. Many rock-forming and accessory minerals show CL characteristics, which can be successfully used in geoscientific research. One of the most spectacular applications is the visualization of growth textures and other internal structures that are not discernable with other analytical techniques. In addition, information from CL imaging and spectroscopy can be used for the reconstruction of processes of mineral formation and alteration to provide information about the real structure of minerals and materials, and to prove the presence and type of lattice incorporation of several trace elements. In the present article, an overview about CL properties of selected minerals is given, and several examples of applications discussed. The presented data illustrate that best results are achieved when luminescence studies are performed under standardized conditions and combined with other analytical techniques with high sensitivity and high spatial resolution.

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“…The former contains a proton near the oxygen vacancy, while the latter with diagnostic 27 Al superhyperfine structures provide experimental proof for the hypothesis that Al impurity plays an important role in the formation of E' centres (Jani et al, 1983;Mashkovtsev and Pan, 2018;Mashkovtsev et al, 2019). In addition, various E" centres arising from interactions between two neighboring E' centers have been discovered and characterized with the tripletstate model in recent years (Table S2; Mashkovtsev et al, 2007;Mashkovtsev and Pan, 2011, 2012b.…”

Section: Point Defects In Quartzmentioning

confidence: 77%

“…Moreover, some investigations have used complex geochemical and mineralogical studies for the reconstruction of silica sources and diagenetic conditions during the formation of euhedral authigenic quartz crystals in soil, limestones and carbonates, sulfate and salt deposits as well as bituminous coal and lignite (e.g. Füchtbauer, 1961; Grimm, 1962; Fabricius, 1987; Richter, 1971; Friedman and Shukla, 1980; Ruppert et al , 1985; Soong and Blattner, 1986; Götze, 2012b). The resulting mineralogical and geochemical characteristics show that the authigenic quartz from the various sedimentary environments differs clearly from quartz of crystalline rocks and a distinction between quartz from different sedimentary environments is possible.…”

Section: Geological Implications Of Quartz Propertiesmentioning

confidence: 99%