Petrology of the Sedimentary Rocks

Greensmith, J. T.

doi:10.1007/978-94-011-9640-6

Cited by 79 publications

(59 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The selected samples were air dried, disaggregated and homogenized before quartering. A 50 g split of each quartered sample was subjected to sieving on a Ro-Tap automated shaker using a sieve nest of 1 2 phi interval for 20 minutes [22,23]. Determination of grain size parameters was based on a graphic presentation of granulometric data in both histogram and cumulative frequency plots as well as the statistical formulae of [24].…”

Section: Methodsmentioning

confidence: 99%

Stratigraphy and depositional environments of the Mamfe Formation and its implication on the tectonosedimentary evolution of the Ikom-Mamfe Embayment, West Africa

Bassey¹,

Eminue²,

Ajonina³

2013

Open Geosciences

View full text Add to dashboard Cite

Abstract:A 42 m thick outcropping portion of the Mamfe Formation is subdivided into Manyu (31 m thick) and Kesham (11m thick) Members on the basis of textural, mineralogical and structural differences. The Manyu Member (Albian) consists of folded and indurated, medium to coarse grained arkosic sandstones and thickly laminated organic-rich shales deposited in a lacustrine environment. The Kesham Member (Cenomanian) consists of subarkoses intercalated with massive green shale and mudstone deposited in a fluvial environment. The change in depositional environment was tectonically controlled. The mid Cretaceous paleogeography of the embayment was governed by the NE-SW trending "Ikom ridge" which prevented marine incursion from adjacent the Benue Sea. Evaporites found within the basin were precipitated from ocean water that was periodically spilled by strong tides and storms across the ridge into the embayment. The filling-up of the embayment to base level in the Cenomanian resulted in a shift in the depositional center downstream to adjoining lower Benue Trough. Similarity in heavy mineral composition and maturity of the Cenomanian sandstones with recent clastics in the embayment indicates their derivation from the same source terrain and relatively stable tectonic and climatic conditions at the source area since the Cenomanian time.

show abstract

Section: Methodsmentioning

confidence: 99%

Stratigraphy and depositional environments of the Mamfe Formation and its implication on the tectonosedimentary evolution of the Ikom-Mamfe Embayment, West Africa

Bassey¹,

Eminue²,

Ajonina³

2013

Open Geosciences

View full text Add to dashboard Cite

show abstract

“…In Deir Alla travertine, the calculated MgCO 3 content ranges from 0.3 wt % to 0.8 wt %, with a mean value of 0.4 wt %, whereas in Suwayma travertine, the range is from 0.9 wt % to 2.2 wt %, with an average value of 1.7%; meanwhile, the calculated MgCO 3 content of Az Zara travertine and tufa ranges from 1.0% to 1.8%, with a mean value of 1.3% (Table 2). This indicates that the calcite in such travertines and tufas is invariably of low Mg calcite [27] ( Table 2). Calcite that contains less than 8% of MgCO 3 has been defined as low-Mg calcite, whereas calcite, with more than 8-11% of MgCO 3 , has been defined as high-Mg calcite [27].…”

Section: Mineralogymentioning

confidence: 97%

“…This indicates that the calcite in such travertines and tufas is invariably of low Mg calcite [27] ( Table 2). Calcite that contains less than 8% of MgCO 3 has been defined as low-Mg calcite, whereas calcite, with more than 8-11% of MgCO 3 , has been defined as high-Mg calcite [27].…”

Section: Mineralogymentioning

confidence: 97%

Geochemistry and Stable Isotopes of Travertine from Jordan Valley and Dead Sea Areas

et al. 2017

View full text Add to dashboard Cite

Travertine deposits in Deir Alla, Suwayma, and Az Zara areas were investigated. Mineralogy, geochemistry, stable isotopes and age dating indicate the presence of low-Mg calcite, with minor quartz components. The variable isotope (δ 13 C and δ 18 O) signatures indicate dependence on water temperature and water/rock isotopic exchange. In contrast, the high δ 13 C values in some travertine samples reflect 12 CO 2 degassing processes, increased input of 13 C-enriched groundwater, and the presence of surface and groundwater hydrological systems. The high δ 18 O values may be attributed to evaporation effects and low water temperature during the formation of localized travertine. The age of travertine is the Late Pleistocene.

show abstract

“…The Green River Formation is notable for the Occurrence of a variety of unusual sodium salts (Greensmith et al, 1971). Thus, high levels of sodium and sulfate could be coming from this alternate source.…”

Section: Possible Site Contamination Of Drivate Well Rfn-014428mentioning

confidence: 99%

Private well/spring position paper, Rifle, Colorado, sites

1995

View full text Add to dashboard Cite

Petrology of the Sedimentary Rocks

Abstract: Hillslope processes A. D. Abrahams (eds)The history of geomorphology K. J. Tinkler (ed.)

Cited by 79 publications

References 0 publications

Stratigraphy and depositional environments of the Mamfe Formation and its implication on the tectonosedimentary evolution of the Ikom-Mamfe Embayment, West Africa

Stratigraphy and depositional environments of the Mamfe Formation and its implication on the tectonosedimentary evolution of the Ikom-Mamfe Embayment, West Africa

Geochemistry and Stable Isotopes of Travertine from Jordan Valley and Dead Sea Areas

Private well/spring position paper, Rifle, Colorado, sites

Contact Info

Product

Resources

About