Origin and significance of the yellow cathodoluminescence (CL) of quartz

Götze, Jens; Pan, Yuanming; Stevens‐Kalceff, Marion A.; Kempe, Ulf; Müller, Axel

doi:10.2138/am-2015-5072

Cited by 31 publications

(29 citation statements)

References 63 publications

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“…Accordingly, the formation history of different quartz generations in fossil wood could be reflected [29][30][31][32]. More recently, spatially and time-resolved analysis of CL emission colors and spectra provided new insights into CL variation of silica and its modifications [23,33,34].…”

Section: Introductionmentioning

confidence: 99%

Deciphering Silicification Pathways of Fossil Forests: Case Studies from the Late Paleozoic of Central Europe

2018

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The occurrence and formation of silicified wood from five late Paleozoic basins in Central Europe was investigated. Fossil wood from diverse geological settings was studied using field observations, taphonomic determinations as well as mineralogical analyses (polarizing microscopy, cathodoluminescence (CL) microscopy and spectroscopy). The results indicate that silicification is either a monophase or multiphase process under varying physico-chemical conditions. In particular, CL studies revealed complex processes of silica accumulation and crystallization. The CL characteristics of quartz phases in silicified wood can mostly be related to blue (390 and 440 nm), yellow (580 nm), and red (650 nm) emission bands, which may appear in different combinations and varying intensity ratios. Yellow CL is typical for initial silicification, reflecting quick precipitation under oxygen-deficient conditions caused by initial decay of the organic material. Blue CL is predominantly of secondary origin, resulting from replacement of precursor phases by a secondary hydrothermal quartz generation or subsequent silicification of wood. The red CL can be related to a lattice defect (non-bridging oxygen hole center—NBOHC).

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Section: Introductionmentioning

confidence: 99%

Deciphering Silicification Pathways of Fossil Forests: Case Studies from the Late Paleozoic of Central Europe

2018

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“…Furthermore, Götze et al (2015) revealed that emission components in quartz are attributed to non-bridge oxygen hole centers (NBOHC) at 1.91 eV and oxygen deficiency and local structural disorder at 2.17 eV, which comparatively correspond to two components at 1.96 eV and 2.16 eV observed in the present samples. Therefore, the emission component of 1.96 eV may be presumed to be due to radiation damage by α particles.…”

Section: Of He + Ion-implanted Synthetic Zirconmentioning

confidence: 56%

“…Similar yellow emission has been reported in the quartz CL as derived from the defect related to oxygen deficiency in the SiO 4 tetrahedra (Krbetschek et al, 1998). Recently, Götze et al (2015) detected a yellow emission in quartz by CL spectral deconvolution, and suggested the emission center is attributable to oxygen deficiency and local structural disorder in the structure. Therefore, the yellow emission in SZ might be due to oxygen defects and local structural disorder in the zircon structure generated during a synthesis process.…”

Section: Of Synthetic Zirconmentioning

confidence: 99%

Cathodoluminescence of synthetic zircon implanted by He<sup>+</sup> ion

et al. 2017

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He + ion implantation at 4.0 MeV, equivalent to energy of α particles from natural radioactive nuclei 238 U and 232 Th, has been conducted for undoped synthetic zircon. The cathodoluminescence (CL) of implanted samples was measured to clarify the radiation-induced effects. Unimplanted synthetic zircon shows pronounced and multiple blue emission bands between 310 nm and 380 nm, whereas the implanted samples have an intense yellow band at ~550 nm. The blue emission bands can be assigned to intrinsic defect centers formed during crystal growth. The yellow band should be derived from induced-defect centers by He + ion implantation, which might be related to the metamicitization originated from a self-induced radiation in natural zircon. The yellow band may be separated into two emission components at 1.96 eV and 2.16 eV. The emission component at 2.16 eV is recognized in both unimplanted and implanted samples, and its intensity increases with an increase in the implantation dose. The CL of zircon can be used as the geodosimeter.

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“…The petrifaction domains (Fig. D and G) represent the initial phase and display yellow cathodoluminescence resulting from conditions of rapid silica precipitation and oxygen depletion (Götze et al ., ; Trümper et al ., ). The wood surrounding the domains was affected later by silicification leading to advanced decomposition, wood displacement or inclusion by quartz crystals and compaction of the trunks (Figs G, H and H; Weiss, ).…”

Section: Discussionmentioning

confidence: 99%

Late Palaeozoic red beds elucidate fluvial architectures preserving large woody debris in the seasonal tropics of central Pangaea

et al. 2020

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Fluvial red beds containing anatomically preserved large woody debris shed new light on seasonally dry biomes of the Pennsylvanian-Permian transition and elucidate the concurrence of river depositional systems and vegetation. As a result, the occurrence, distribution and preservation of petrified large woody debris accumulations are considered crucial to understanding the role of arborescent vegetation in shaping fluvial environments. This study reports sizeable silicified trunks and corresponding fluvial architectures from the uppermost Pennsylvanian (upper Gzhelian) Siebigerode Formation (Kyffh€ auser, central Germany). The origin, taphonomy and depositional environment of the fossil woods are elucidated by using a multidisciplinary approach including geological mapping, lithofacies analysis, sediment petrography, wood anatomical studies and microstructure analyses. Results reflect the gradual burial of a gentle basement elevation by sand-bed to gravel-bed braided rivers at the northwestern margin of the perimontane Saale Basin. Facies architectures resulted from a complex interplay of syndepositional tectonics, repeated palaeorelief rejuvenation, high-frequency channel avulsion, seasonally dry climate and woody debris-sediment interactions. The alluvial influx and cut-bank erosion recruited trunks from adjacent semi-riparian slope habitats vegetated by up to 40 m tall cordaitaleans and conifers. High discharge in wide braids facilitated uncongested transport of large woody debris. Trunk entombment and initial preservation resulted from grounding on barforms, anchoring by attached roots and subsequent burial. The post-depositional two-phase silicification was influenced by hydrothermal hematite mineralization and determined a selective wood preservation pattern known as 'pointstone'. Large woody debris-induced sedimentary structures ('LWDISS') are introduced as a class of sediment structures formed by the biogenic impact on terrestrial deposition.

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Origin and significance of the yellow cathodoluminescence (CL) of quartz

Cited by 31 publications

References 63 publications

Deciphering Silicification Pathways of Fossil Forests: Case Studies from the Late Paleozoic of Central Europe

Deciphering Silicification Pathways of Fossil Forests: Case Studies from the Late Paleozoic of Central Europe

Cathodoluminescence of synthetic zircon implanted by He<sup>+</sup> ion

Late Palaeozoic red beds elucidate fluvial architectures preserving large woody debris in the seasonal tropics of central Pangaea

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