A Mössbauer Study of Evolution of Glauconite From Chinese Seas

Ali, Abdelilah Musa; Hsia, Yuanfu; Liu, Rongchuan; Zhang, Jinrong; Weimin, Duan; Chen, Lirong

doi:10.1081/sl-100107892

Cited by 9 publications

(5 citation statements)

References 4 publications

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“…Collectively, these data suggest the presence of two slightly different octahedral sites for Fe 3+ , possibly suggesting some trioctahedral character in the clays. The difference in the average of the quadrupole splitting between the two sites, 0.41 mm/s, is similar to that reported for glauconite by Ali [47] but shifted to higher values by about 0.25 mm/s. Based on peak areas ( Table 4 ), Fe 3+ is more abundant in the site characterized by lower quadrupole splitting.…”

Section: Resultssupporting

confidence: 87%

“…Nonetheless, the distinct bi-modal array of IS and QS values suggests again the presence of two octahedral sites for Fe 2+ . Because of its substantial Fe content, there is considerable literature on Mössbauer spectra of glauconite, and a number of workers have allocated Fe to cis -M2 and trans -M1 sites [47] – [51] . However, Rancourt and co-workers [52] – [54] have argued that these sites may not be positively delineated, and that the spectral data may be recording local distortion environments.…”

Section: Resultsmentioning

confidence: 99%

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Mineralogy and Geochemistry of the Main Glauconite Bed in the Middle Eocene of Texas: Paleoenvironmental Implications for the Verdine Facies

et al. 2014

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The Main Glauconite Bed (MGB) is a pelleted greensand located at Stone City Bluff on the south bank of the Brazos River in Burleson County, Texas. It was deposited during the Middle Eocene regional transgression on the Texas Gulf Coastal Plain. Stratigraphically it lies in the upper Stone City Member, Crockett Formation, Claiborne Group. Its mineralogy and geochemistry were examined in detail, and verdine facies minerals, predominantly odinite, were identified. Few glauconitic minerals were found in the green pelleted sediments of the MGB. Without detailed mineralogical work, glaucony facies minerals and verdine facies minerals are easily mistaken for one another. Their distinction has value in assessing paleoenvironments. In this study, several analytical techniques were employed to assess the mineralogy. X-ray diffraction of oriented and un-oriented clay samples indicated a clay mixture dominated by 7 and 14Å diffraction peaks. Unit cell calculations from XRD data for MGB pellets match the odinite-1M data base. Electron microprobe analyses (EMPA) from the average of 31 data points from clay pellets accompanied with Mössbauer analyses were used to calculate the structural formula which is that of odinite: Fe3+ 0.89 Mg0.45 Al0.67 Fe2+ 0.30 Ti0.01 Mn0.01) Σ = 2.33 (Si1.77 Al0.23) O5.00 (OH)4.00. QEMSCAN (Quantitative Evaluation of Minerals by Scanning Electron Microscopy) data provided mineral maps of quantitative proportions of the constituent clays. The verdine facies is a clay mineral facies associated with shallow marine shelf and lagoonal environments at tropical latitudes with iron influx from nearby runoff. Its depositional environment is well documented in modern nearshore locations. Recognition of verdine facies clays as the dominant constituent of the MGB clay pellets, rather than glaucony facies clays, allows for a more precise assessment of paleoenvironmental conditions.

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Section: Resultssupporting

confidence: 87%

Section: Resultsmentioning

confidence: 99%

Mineralogy and Geochemistry of the Main Glauconite Bed in the Middle Eocene of Texas: Paleoenvironmental Implications for the Verdine Facies

et al. 2014

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“…There are some different models for glauconite spectrum fitting [4][5][6] (fourdoublet or three-doublet models) due to the different possible distribution of ferric and ferrous atoms in different position M1 and M2 of glauconite. The octahedral sheet of glauconite contains three structurally-independent positions: one transoctahedron (M1) and two cis-octahedra (M2) differing in positions of the OH groups.…”

Section: Resultsmentioning

confidence: 99%

Mössbauer study of dissimilatory reduction of iron contained in glauconite by alkaliphilic bacteria

et al. 2012

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57 Fe Mössbauer investigations of glauconite and new solid phases formed during the process of the bacterial growth in alkaline environment were carried out at room temperature, 78 K and 4.8 K. The magnetically ordered phase formed during bioleaching of glauconite by G. ferrihydriticus in pure culture or in combination with Cl. alkalicellulosi represented as a mixture of off-stoichiometric magnetite and maghemite. In case of combined binary bacterium culture growth the relative content of magnetically ordered phase was more than for the G. ferrihydriticus growth.

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“…Published Mössbauer spectra of glauconite show that the absorption lines for both octahedrally coordinated ferrous and ferric iron, [6] Fe 3+ and [6] Fe 2+ , are broad and overlapping (Rongchuan et al, 1986; Cardile and Brown, 1988;Ali et al, 2001, Kuzmann et al, 2003.…”

Section: Mössbauer Spectroscopymentioning

confidence: 99%

“…According to Ali et al (2001) and a corresponding increase of [6] Fe 3+ in the M2 site. Data in Fig.…”

Section: Mössbauer Spectroscopymentioning

confidence: 99%

Multiproxy analysis of a new terrestrial and a marine Cretaceous–Paleogene (K–Pg) boundary site from New Zealand

Ferrow

Vajda

Koch

et al. 2011

Geochimica et Cosmochimica Acta

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study of palynology, Mössbauer spectroscopy, mineralogy and osmium isotopes has led to the detection of the first K-Pg boundary clay layer in a SouthernHemisphere terrestrial setting. The K-Pg boundary layer was independently identified at centimetre resolution by all the above mentioned methods at the marine K-Pg boundary site of mid-Waipara and the terrestrial site of Compressor Creek (Greymouth coal field), New Zealand. Mössbauer spectroscopy shows an anomaly of Fe-containing particles in both K-Pg boundary sections: jarosite at mid-Waipara and goethite at Compressor Creek. This anomaly coincides with a turnover in vegetation indicated by an interval dominated by fern spores and extinction of key pollen species in both sections. In addition to the terrestrial floristic changes, the mid-Waipara section reveals a turnover in the dinoflagellate assemblages and the appearance of global earliest Danian index species. Geochemical data reveal relatively small iridium enrichments in the boundary layers of 321 pg/g at mid-Waipara and 176 pg/g at Compressor Creek. Unradiogenic 187 Os/ 188 Os values of the boundary clay reveal the presence of a significant extraterrestrial component. We interpret the accumulation of Fe nano-phases at the boundary as originating from both the impactor and the crystalline basement target rock. The goethite and jarosite are interpreted as secondary phases formed by weathering and diagenesis. The primary phases were probably controlled by the initial composition of the vapor plume and condensation kinetics rather than condensation thermodynamics. This investigation indicates that identification of Fe in nano-phases by Mössbauer spectroscopy is an accurate and cost-effective method for identifying impact event horizons and it efficiently complements widely used biostratigraphic and geochemical methods. INTRODUCTION3 Geochemical, mineralogical, morphological, and paleontological evidence has now shown that the impact of a celestial body in what is now the Yucatán Peninsula in Mexico caused a sudden, dramatic, and global ecological perturbation ~65.5 million years ago (Ma) (Kring, 2007). This event left its imprint as a global clay layer, the so-called Cretaceous-Paleogene (K-Pg) boundary layer (Alvarez et al., 1980; Smit, 1999; Kring, 2007; Schulte et al., 2010).Evidence strongly supporting an impact is provided by the global presence of iridium and other platinum group element (PGE) anomalies (e.g. Alvarez et al., 1980; Kyte, 2002; Claeys et al., 2002; Schulte et al., 2009), the occurrence of high T and high P phases of shocked quartz (Bohor et al., 1984(Bohor et al., , 1987 Izett, 1990; Claeys et al., 2002), the abundance of tektites and impact related glasses (Izett, 1991; Sigurdsson et al., 1991a Sigurdsson et al., , 1991b, and the findings of Ni-rich spinels in the uppermost clay layer that separates the Cretaceous from the Paleogene (Smit and Kyte, 1984; Kyte and Smit, 1986; Robin et al., 1992). is characterized biostratigraphically by a turnover and/or mass extinction of the pa...

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A Mössbauer Study of Evolution of Glauconite From Chinese Seas

Cited by 9 publications

References 4 publications

Mineralogy and Geochemistry of the Main Glauconite Bed in the Middle Eocene of Texas: Paleoenvironmental Implications for the Verdine Facies

Mineralogy and Geochemistry of the Main Glauconite Bed in the Middle Eocene of Texas: Paleoenvironmental Implications for the Verdine Facies

Mössbauer study of dissimilatory reduction of iron contained in glauconite by alkaliphilic bacteria

Multiproxy analysis of a new terrestrial and a marine Cretaceous–Paleogene (K–Pg) boundary site from New Zealand

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