The Iron Mineralogy of Eocene Fossil Wood—a Mössbauer Study of Samples From the Petrified Forest, New Cairo, Egypt

Hassan, Kamaleldin M.

doi:10.3749/canmin.1400108

Cited by 8 publications

(2 citation statements)

References 34 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…position differing from the stoichiometric variety due to vacancy mechanism and isomorphic replacement mechanism. Therefore, the hyperfine magnetic fields obtained for these Feoxides and hydroxides are lower than those reported in the literature(Stevens et al 2005;Hassan 2015). The two doublets with isomer shift (IS) values of 1.06-1.21 mm/s and quadrupole splitting (QS) of 2.55-2.85 mm/s and 2.88-2.95 mm/s originate with Fe 2+ ions in the octahedral positions of the olivine structure(Kądziołka-Gaweł et al 2018).…”

contrasting

confidence: 65%

High temperature transformation of iron-bearing minerals in basalt: Mössbauer spectroscopy studies

2022

View full text Add to dashboard Cite

The high temperature decomposition of basalt from Lower Silesia (Poland) was followed by Mössbauer spectroscopy investigation. The Fe content of the sample was ~9.0 at.%. The X-ray diffraction analysis shows that augite (37%) and olivine (12%) are major Fe-bearing mineral components. The sample also contains significant amount of anorthite (22%) and nepheline (17%). The sample was heated at various temperatures between 200°C and 1100°C for three hours. Up to a temperature of 500°C changes in contribution of Fe-bearing minerals are insignificant. Heating in the temperature range from 500°C to 1100°C leads to a systematic increase in contribution of iron oxides at the cost of contribution of silicate minerals, like augite and olivine. Mössbauer spectrum obtained after heating at 1100°C showed hematite as the main iron oxide phase. The ratio of Fe3+/Fetot in the non-heated sample was equal to 0.51 and after heating at 1100°C this ratio amounted to 0.89.

show abstract

contrasting

confidence: 65%

High temperature transformation of iron-bearing minerals in basalt: Mössbauer spectroscopy studies

2022

View full text Add to dashboard Cite

show abstract

“…Whole-sample ICP-MS analyses, organic carbon (OC) and loss on ignition (LOI) for fossil wood from the New Cairo Petrified Forest, Egypt (Hassan 2015a For the present study, ten representative samples (S1-S10) of whole-rock petrified wood were collected from silicified stumps and logs at the Petrified Forest. The samples were fresh samples that had not been exposed to weathering; any weathered part was removed.…”

Section: Tablementioning

confidence: 99%

The fossil wood of East Cairo, Egypt: A mineralogical view

Hassan

2015

Mineralogia

Self Cite

View full text Add to dashboard Cite

Abstract. As part of the characterization of the petrified wood of East Cairo at the New Cairo Petrified Forest, representative samples collected from the area were studied by X-ray powder diffraction (XRD) and optical microscopy. The samples, as indicated by XRD analysis, are composed of quartz ± some goethite ± minor moganite ± minor gypsum ± trace calcite. The absence of moganite in some samples has been attributed to the transformation of moganite to quartz or to leaching processes. Under the optical microscope, some of the 10 petrified-wood samples are permineralized with mainly microcrystalline quartz (chalcedony), some with a combination of chalcedony and microgranular quartz, and some with microgranular quartz. The sequence of silicification is likely to have been either opaline precursor to chalcedony and quartz, or directly to chalcedony and quartz. The crystallinity indices (C.I.) of the quartz in the samples studied, measured using a standard X-ray powder diffraction procedure, are consistent with the petrographic findings. The chalcedonic samples have the least C.I. values, and the microgranular quartz samples the highest values.

show abstract

Late Holocene climate change inferred from the lithology and chemical stratigraphy of sediment cores from Swan Lake, Nebraska Sandhills, USA

Hassan

2022

J Paleolimnol

View full text Add to dashboard Cite

The Iron Mineralogy of Eocene Fossil Wood—a Mössbauer Study of Samples From the Petrified Forest, New Cairo, Egypt

Cited by 8 publications

References 34 publications

High temperature transformation of iron-bearing minerals in basalt: Mössbauer spectroscopy studies

High temperature transformation of iron-bearing minerals in basalt: Mössbauer spectroscopy studies

The fossil wood of East Cairo, Egypt: A mineralogical view

Late Holocene climate change inferred from the lithology and chemical stratigraphy of sediment cores from Swan Lake, Nebraska Sandhills, USA

Contact Info

Product

Resources

About