Geochemistry of shales from the Archean (~3.0 Ga) Buhwa Greenstone Belt, Zimbabwe: Implications for provenance and source-area weathering

Fedo, C. M.; Eriksson, Kenneth A.; Krogstad, E. J.

doi:10.1016/0016-7037(96)00058-0

Cited by 385 publications

(141 citation statements)

References 29 publications

Supporting

Mentioning

137

Contrasting

Order By: Relevance

“…Thus, the strong positive correlations between Al 2 O 3 and Cr, Cu, Cd, Pb, Se, Ga, Zr, Nb and Y, (Table 2) reveal that these elements are concentrated during weathering processes (cf. Fedo et al 1996).…”

Section: Major Elementsmentioning

confidence: 99%

Geochemistry, mineralogy and depositional environment of black shales of the Duwi Formation, Qusseir area, Red Sea coast, Egypt

El‐Anwar¹,

Mekky²,

Wahab³

2018

Carbonates Evaporites

View full text Add to dashboard Cite

This study focuses on the geochemistry of redox-sensitive elements of marine black shales at the Qusseir area of the Duwi Formation to infer their depositional environment. The black shales from the uppermost member of the Duwi Formation in the Qusseir area is conformably overlain by the Qusseir variegated shale and underlain by the Dakhla shale. Detailed mineralogical and geochemical characteristics were examined using several techniques, including X-ray diffractometry, scanning electron microscopy and X-ray fluorescence. Mineralogically, black shales in the Duwi Formation are composed mainly of montmorillonite, kaolinite, calcite, gypsum, quartz and pyrite. They are detrital and authigenic in origin. They are most probably derived from basic volcanic rocks by intensive chemical weathering under the prevalence of semiarid conditions. The redox-sensitive trace metals suggest anoxic sulfidic conditions that favoured the accumulation of these metals in the Qusseir area of the Duwi Formation.

show abstract

Section: Major Elementsmentioning

confidence: 99%

Geochemistry, mineralogy and depositional environment of black shales of the Duwi Formation, Qusseir area, Red Sea coast, Egypt

El‐Anwar¹,

Mekky²,

Wahab³

2018

Carbonates Evaporites

View full text Add to dashboard Cite

show abstract

“…Organic matter is considered as an important host of heavy metals on which they can be adsorbed and accumulated during weathering process [23,34]. Organic matter content is higher : background base value for each element during hot seasons which is most probably due to flourishing of phyto and zoo plankton, that led in turn to high organic productivity [15,28].…”

Section: Abundance Of Organic Matter Contentmentioning

confidence: 99%

Comparative Geochemical Assessment of Heavy Metal Pollutants among the Mediterranean Deltaic Lakes Sediments (Edku, Burullus and Manzala), Egypt.

et al. 2017

View full text Add to dashboard Cite

“…Wright et al (1987) and Wignall (1994) sug gested that the Ce anom aly can re cord the redox con di tions of the over ly ing sea wa ter col umn, and that this sig na ture re mains in spite of sub se quent burial and later diagenesis. Eu/Eu* anom a lies have been re ported in many types of ig ne ous and sed i men tary rocks and Eu anom a lies play a sig nif icant role in in ter pret ing the phys i cal and chem i cal con di tions (e.g., Derry and Jacobsen, 1990;MacRae et al, 1992;Fedo et al, 1996;Ras mus sen et al, 1998;Lee et al, 2004;Sugitani et al, 2006 and oth ers). Nor mal iza tion of Ce and Eu val ues by Zr showed that both el e ments could in di cate a lo cal detritic in putCe in the up per part of the sedgwickii Biozone in clud ing the Upper Aeronian car bon iso tope anom aly and also in the ras trum and linnaei biozones while Eu only close to the Up per Aeronian car bon iso tope anom aly.…”

Section: Fe/s Ratiomentioning

confidence: 99%

Trace element variations as a proxy for reconstruction of palaeoenvironmental changes during the Late Aeronian faunal and carbon isotope perturbations: new data from the peri-Gondwanan region

Pašava

Frýda

Štorch

2016

View full text Add to dashboard Cite

Trace el e ment vari a tions in the Up per Aeronian (Llandovery, Lower Si lu rian), deep-wa ter, black shale suc ces sion of the Barrandian area (Perunica) were stud ied across an in ter val as so ci ated with a graptolite mass ex tinc tion and global, pos i tive car bon iso tope anom aly. The main aim of the pa per is to test whether dis tinct changes in graptolite di ver sity dur ing Late Aeronian were linked with changes in deep sea wa ter ox y gen a tion. Us ing mul ti ple geo chem i cal prox ies we doc u mented high-fre quency changes in ox y gen a tion of sea wa ter from sed i ments of the convolutus to linnaei (guerichi) biozones. Detailed com par i son of graptolite di ver sity with those high-fre quency ox y gen a tion changes sug gests that the long-term and step-wise Late Aeronian graptolite cri sis was not sig nif i cantly in flu enced by changes in ox y gen level and thus it prob a bly resulted by an other causes. The col lapse of global car bon cy cle dur ing the Late Aeronian prob a bly only tem po rarily in creased ex tinc tion rate of the long-term graptolite cri sis and con sid er ably de creased even ness of the up per most Aeronian graptolite com mu ni ties. The Aeronian graptolite mass ex tinc tion was thus pri mar ily driven by other bi otic and/or abiotic causes.

show abstract

Geochemistry of shales from the Archean (~3.0 Ga) Buhwa Greenstone Belt, Zimbabwe: Implications for provenance and source-area weathering

Cited by 385 publications

References 29 publications

Geochemistry, mineralogy and depositional environment of black shales of the Duwi Formation, Qusseir area, Red Sea coast, Egypt

Geochemistry, mineralogy and depositional environment of black shales of the Duwi Formation, Qusseir area, Red Sea coast, Egypt

Comparative Geochemical Assessment of Heavy Metal Pollutants among the Mediterranean Deltaic Lakes Sediments (Edku, Burullus and Manzala), Egypt.

Trace element variations as a proxy for reconstruction of palaeoenvironmental changes during the Late Aeronian faunal and carbon isotope perturbations: new data from the peri-Gondwanan region

Contact Info

Product

Resources

About