Petrological Modifications in Continental Target Rocks from Terrestrial Impact Structures: Evidence from Cathodoluminescence

Götte, Thomas

doi:10.1007/978-3-540-87529-1_3

Cited by 8 publications

(19 citation statements)

References 31 publications

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“…2010). Götte (2009) attributed the presence of a 630–650 nm emission band in shocked quartz from the Siljan and Araguainha craters to thermal breaking of OH groups, which are incorporated in the quartz. However, according to Stevens Kalceff et al.…”

Section: Discussionmentioning

confidence: 99%

“…1992; Ramseyer and Mullis 2000; Trepmann et al. 2005; Götte 2009; Okumura et al. 2009; Kayama et al.…”

Section: Samples and Methodsmentioning

confidence: 99%

“…Shocked quartz is generally blue luminescent, with an additional emission band at 630-650 nm Ramseyer and Mullis 2000;Go¨tte 2009;Okumura et al 2009;Kayama et al 2010), although the 630-650 nm band was not observed in experimentally shocked quartzite (Gucsik et al 2003).…”

Section: Cathodoluminescence Backgroundmentioning

confidence: 99%

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Scanning electron microscope‐cathodoluminescence (SEM‐CL) imaging of planar deformation features and tectonic deformation lamellae in quartz

Hamers¹,

Drury

2011

Meteorit & Planetary Scien

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Abstract-Planar deformation features (PDFs) in quartz are essential proof for the correct identification of meteorite impact structures and related ejecta layers, but can be confused with tectonic deformation lamellae. The only completely reliable method to demonstrate the shock origin of suspected (sub-) planar microstructures, transmission electron microscope (TEM) observations, is costly and time consuming. We have used a cathodoluminescence (CL) detector attached to a scanning electron microscope (SEM) to image both PDFs and tectonic deformation lamellae in quartz to demonstrate the potential of a simple method to identify PDFs and define characteristics that allow their distinction from tectonic deformation lamellae. In both limited wavelength grayscale and composite color SEM-CL images, PDFs are easily identified. They are straight, narrow, well-defined features, whereas tectonic deformation lamellae are thicker, slightly curved, and there is often no clear boundary between lamella and host quartz. Composite color images reveal two types of CL behavior in PDFs: either they emit a red to infrared CL signal or they are nonluminescent. The color of the CL signal emitted by tectonic deformation lamellae ranges from blue to red. For comparison, we also imaged several shocked quartz grains at cryogenic temperature. In most cases, the PDF characteristics in cryo-CL images do not differ significantly from those in images recorded at room temperature. We conclude that SEM-CL imaging, especially when color composites are used, provides a promising, practical, low cost, and nondestructive method to distinguish between PDFs and tectonic lamellae, even when the simplest CL techniques available are used.

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Section: Discussionmentioning

confidence: 99%

“…1992; Ramseyer and Mullis 2000; Trepmann et al. 2005; Götte 2009; Okumura et al. 2009; Kayama et al.…”

Section: Samples and Methodsmentioning

confidence: 99%

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Scanning electron microscope‐cathodoluminescence (SEM‐CL) imaging of planar deformation features and tectonic deformation lamellae in quartz

Hamers¹,

Drury

2011

Meteorit & Planetary Scien

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“…The CL spectroscopic properties of shocked quartz, as well as its PDFs, have been described from various shock metamorphic environments such as terrestrial impact structures (e.g., Ramseyer et al 1992;Dypvik et al 1996;Seyedolali et al 1997;Boggs et al 2001;Trepmann et al 2005;Götte 2009; Hamers and Drury 2011 and references therein) and shock recovery experiments (Gucsik et al 2003). The question of whether shock metamorphic effects can modify the luminescent nature of quartz under high pressure was first addressed in a pioneering study by Boggs et al (2001).…”

Section: Introductionmentioning

confidence: 99%

“…The luminescence properties of shocked quartz and its shock-induced microstructures both in natural and experimental cases are poorly understood (e.g., Ramseyer et al 1992;Dypvik et al 1996;Seyedolali et al 1997;Boggs et al 2001;Gucsik et al 2003Gucsik et al , 2004Trepmann et al 2005;Götte 2009;Okumura et al 2009;Hamers and Drury 2011 and references therein). In this study our primary aim was to explain the CL behavior of shocked quartz, including the origin and characteristics of the CL signal in PDFs.…”

Section: Introductionmentioning

confidence: 99%

Non-luminescent nature of the planar deformation features in shocked quartz from the Ries impact structure, Germany: A new interpretation

Gucsik¹,

Okumura²,

Nishido³

et al. 2015

Central European Geology

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Quartz grains from the Ries impact structure containing shock-induced microstructures were investigated using Scanning Electron Microscopy in cathodoluminescence (SEM-CL), secondary electron (SEM-SE) and back-scattered electron (SEM-BSE) modes as well as Mott-Seitz analysis. The purpose of this study is to evaluate the mechanism by which CL detects Planar Deformation Features (PDFs) in quartz, which is one of the most important indicators of shock metamorphism in rock-forming minerals. PDFs are micron-scale features not easily identified using optical microscopy or scanning electron microscopy. The CL spectrum of PDFs in quartz that has suffered relatively high shock pressure shows no or a relatively weak emission band at around 385 nm, whereas an emission band with a maximum near 650 nm is observed independent of shock pressure. Thus, the ~385 nm intensity in shocked quartz demonstrates a tendency to decrease with increasing shock metamorphic stage, whereas the 650 nm band remains fairly constant. The result indicates that the emission band at 385 nm is related to the deformed structure of quartz as PDFs.

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Fluorapatite in carbonatite-related phosphate deposits: the case of the Matongo carbonatite (Burundi)

et al. 2015

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Petrological Modifications in Continental Target Rocks from Terrestrial Impact Structures: Evidence from Cathodoluminescence

Cited by 8 publications

References 31 publications

Scanning electron microscope‐cathodoluminescence (SEM‐CL) imaging of planar deformation features and tectonic deformation lamellae in quartz

Scanning electron microscope‐cathodoluminescence (SEM‐CL) imaging of planar deformation features and tectonic deformation lamellae in quartz

Non-luminescent nature of the planar deformation features in shocked quartz from the Ries impact structure, Germany: A new interpretation

Fluorapatite in carbonatite-related phosphate deposits: the case of the Matongo carbonatite (Burundi)

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