Assessing low-maturity organic matter in shales using Raman spectroscopy: Effects of sample preparation and operating procedure

Henry, Delano G.; Jarvis, Ian; Gillmore, Gavin; Stephenson, Michael H.; Emmings, Joseph F.

doi:10.1016/j.coal.2018.03.005

Cited by 93 publications

(124 citation statements)

References 55 publications

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“…An exponential decay function (Equation ) was fitted to the remaining data points, which included the data from Ammar and Rouzaud (2012); Guedes et al (2010); Henry et al (2018, 2019b); Hinrichs et al (2014); Jubb et al (2018); Kwiecinska et al (2010); Li et al (2019); Lupoi et al (2017); Quirico et al (2005); Rantitsch et al (2004, 2016a); Schmidt et al (2017); and Wilkins et al (2014), comprising 388 spectra. The regression was adjusted by means of a statistical weight Levenberg Marquardt least‐squares algorithms using QtiPlot 0.9.8.9 (Vasilief 2014).…”

Section: Resultsmentioning

confidence: 99%

“…The authors who studied OM/CM by Raman spectroscopy and reported the G‐band width along with vitrinite reflectance are: Ammar and Rouzaud (2012); Bonoldi et al (2016); Ghosh et al (2018); Guedes et al (2010); Henry et al (2018, 2019b); Hinrichs et al (2014); Jubb et al (2018); Kelemen and Fang (2001); Kwiecinska et al (2010); Li et al (2019); Lupoi et al (2017); Quirico et al (2005); Rantitsch et al (2004, 2016a); Schmidt et al (2017); Spötl et al (1998); and Wilkins et al (2014). The acquisition protocols of all authors are described in Table in supporting information, the full raw data sets are available at Table in supporting information.…”

Section: Methodsmentioning

confidence: 99%

“…Bonal et al (2016) demonstrated that laser power >0.5 mW modifies the spectra of coal samples. Henry et al (2018) showed that >0.2 mW power alters the Raman spectra of sedimentary OM. Considering that Hinrichs et al (2014) acquired coal spectra with 0.7 mW, their raw data were reassessed, calibrating the parameters with the data of Schmidt et al (2017), acquired in the same equipment with laser power restricted to 0.15 mW.…”

Section: Methodsmentioning

confidence: 99%

“…The discrepancies are usually attributed to the employed laser power and polishing procedures. Excessive laser power at the focal plane of the measurement may cause thermal degradation or photo oxidation of OM (Quirico et al 2005; Henry et al 2018) and graphite (Everall et al 1991; Ammar and Rouzaud 2012). The polishing procedures do significantly modify the D‐band of graphitic materials, but only negligibly affect the G‐band width (Ammar and Rouzaud 2012; Ammar et al 2015).…”

Section: Introductionmentioning

confidence: 99%

“…For this context, Lünsdorf et al (2014) proposed a standardized curve‐fitting protocol. The multifunction fitting of D‐ and G‐bands may significantly alter the band parameters, as demonstrated by Henry et al (2018); Hinrichs et al (2014); and Lupoi et al (2017), precluding the comparison of the broad D‐band. As a consequence of the slender profile of the G‐band, multiband fitting is straightforward, therefore allowing the comparison of more data sets.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Evaluation of terrestrial carbonaceous matter aromatization by Raman spectroscopy and its application to C chondrites

Schmidt

Hinrichs

2020

Meteorit & Planetary Scien

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A Raman method to estimate the aromatization degree of carbonaceous matter (CM) was established, and calibrated by literature data respecting differences in acquisition procedures. The generated equations allowed a comparison of the G-band width to vitrinite reflectance, and to additional structural organization parameter extracted from X-ray powder diffraction. The relations between aromatization degree and peak temperatures from literature were then propagated to G-band width parameter. The applicability of these geothermometers is demonstrated by the consistency of data obtained for carbonaceous chondrites with previous estimations. Since the CM aromatization is controlled by peak temperature and time span, it is possible to estimate the duration of chondrite's heating events. The G-band width relation to elemental ratio trends of organic matter in chondrites, interplanetary dust particles, glucose, and saccharose-based semi-coke favors synthesis by formose route. These findings provide new approaches for the future development of chemical kinetic models for organic matter of chondrites. A reliable chemical model may allow the external calibration of numerical models for accurately evaluating the peak temperatures and cooling durations of chondrites.

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Evaluation of terrestrial carbonaceous matter aromatization by Raman spectroscopy and its application to C chondrites

Schmidt

Hinrichs

2020

Meteorit & Planetary Scien

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Raman spectroscopy is a powerful tool in molecular paleobiology: An analytical response to Alleon et al. (https://doi.org/10.1002/bies.202000295)

Wiemann

Briggs

2022

BioEssays

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A recent article argued that signals from conventional Raman spectroscopy of organic materials are overwhelmed by edge filter and fluorescence artefacts. The article targeted a subset of Raman spectroscopic investigations of fossil and modern organisms and has implications for the utility of conventional Raman spectroscopy in comparative tissue analytics. The inferences were based on circular reasoning centered around the unconventional analysis of spectra from just two samples, one modern, and one fossil. We validated the disputed signals with in situ Fourier‐Transform Infrared (FT‐IR) Spectroscopy and through replication with different lasers, filters, and operators in independent laboratories. Our Raman system employs a holographic notch filter which is not affected by edge filter or other artefacts. Multiple lines of evidence confirm that conventional Raman spectra of fossils contain biologically and geologically meaningful information. Statistical analyses of large Raman and FT‐IR spectral data sets reveal patterns in fossil composition and yield valuable insights into the history of life.

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Maturity and thermal evolution differences between two sets of Lower Palaeozoic shales and its significance for shale gas formation in south‐western Sichuan Basin, China

et al. 2021

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The Lower Cambrian Qiongzhusi shale and the Upper Ordovician-Lower Silurian Wufeng-Longmaxi shale are major source rocks and important shale gas exploration targets in the Sichuan Basin. Cutting and core samples from two shale gas wells in south-western Sichuan Basin have been selected for organic matter (OM) reflectance measurement and Raman spectra analysis with the aim to determine maturity. The results were incorporated for basin modelling to construct the thermal evolution of this area. Graptolite fragments and pyrobitumens are the dominant form of OM in

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Assessing low-maturity organic matter in shales using Raman spectroscopy: Effects of sample preparation and operating procedure

Cited by 93 publications

References 55 publications

Evaluation of terrestrial carbonaceous matter aromatization by Raman spectroscopy and its application to C chondrites

Evaluation of terrestrial carbonaceous matter aromatization by Raman spectroscopy and its application to C chondrites

Raman spectroscopy is a powerful tool in molecular paleobiology: An analytical response to Alleon et al. (https://doi.org/10.1002/bies.202000295)

Maturity and thermal evolution differences between two sets of Lower Palaeozoic shales and its significance for shale gas formation in south‐western Sichuan Basin, China

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