Occurrence of phreatic dolocrete within Tertiary clastic deposits of Kuwait, Arabian Gulf

Khalaf, Fikry I.

doi:10.1016/0037-0738(90)90114-9

Cited by 56 publications

(47 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, complete dedolomitization and calcitization only occur in the near-surface profiles, whereas deeper profiles (deeper than 10 m) are only partially dedolomitized. It is worth noting that the dolomite of the studied dolocrete is generally zoned and two phases of dolomite can be recognized, namely a metastable disordered dolomite which forms the cloudy cores or zones, and a stable dolomite which usually forms the clear zones of the composite or zoned dolomite crystals (Khalaf, 1990).…”

Section: Discussionmentioning

confidence: 99%

“…Based on the type of authigenic minerals, several varieties of duricrusts have been recognized, namely, calcrete, dolocrete, ferricrete, silcrete, gypcrete, phoscrete and alcrete (Lamplugh, 1902;Goudi, 1973). The occurrence and genesis of dolocretes and calcretes have been studied by many workers (Nagtegaal, 1969;Netterberg, 1969;Goudie, 1972;Watts, 1977;Mann and Horwitz, 1979;Arakel and McConchie, 1982;Esteban and Klappa, 1983;Semeniuk and Searle, 1984;and Khalaf, 1987;1990).…”

Section: Introductionmentioning

confidence: 99%

“…The term dolocrete is used in the present study to denote fossil near-surface calcareous duricrusts formed of siliclastic sediments that are partially or completely cemented and/or replaced by terrestrial phreatic dolomite, which is directly precipitated from Mg-rich pore water (Khalaf, 1987;1990).…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Dedolomitization of dolocrete deposits in Kuwait, Arabian Gulf

Khalaf

Abdal

1993

Geol Rundsch

View full text Add to dashboard Cite

Dedolomitization of a dolocrete profile hosted in Mio-Pleistocene siliciclastic deposits in the area of Kuwait City, Arabian Gulf was investigated. Dolocrete dolomite crystals vary considerably in size, shape and internal structure; however, they are mostly zoned. Zonation is usually due to the alteration of cloudy and clear zones. The cloudy zones, which are mostly formed of disordered metastable dolomite, are more susceptible to dedolomitization than the stable, well ordered clear zones. Two modes of dedolomitization were recognized; the first involves complete dissolution of the metastable dolomite followed by precipitation of intracrystalline cavity-filling calcite. The second is a pseudomorphic replacement of dolomite by calcite. This replacement takes place by the simultaneous dissolution of dolomite and precipitation of calcite in such a manner that the original dolomite fabrics are inherited in the dedolomite. Exposed and near-surface dolocrete profile (less than 5 m deep) are almost completely dedolomitized and altered to secondary calcrete whereas subsurface profiles are slightly dedolomitized. Dedolomitization of the sub surface dolocrete profiles may indicate the effect of flushing by fresh groundwater; which flows from west to east, whereas the alteration of the exposed dolocrete profile could be attributed to be an effect of meteoric water. A new mode of calcrete genesis by dedolomitization and/or complete calcitization of precursor dolocrete is suggested.

show abstract

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Dedolomitization of dolocrete deposits in Kuwait, Arabian Gulf

Khalaf

Abdal

1993

Geol Rundsch

View full text Add to dashboard Cite

show abstract

“…Cementation of the channel deposits may have occurred via evaporation of groundwater that concentrated calcium carbonate and other minerals at the surface during the dry season, leading to indurated fluvial deposits (Harris, 1980). Alternatively, carbonate cementation may have occurred during post-depositional diagenesis (e.g., Arakel, 1986;Khalaf, 1990;Spötl and Writght, 1992). In addition to carbonate cement, Lorenz et al (2006) reported localized quartz cement (graincoating and pore-filling) binding the fluvial sediments.…”

Section: Study Regionmentioning

confidence: 99%

Evaluation of paleohydrologic models for terrestrial inverted channels: Implications for application to martian sinuous ridges

2009

View full text Add to dashboard Cite

“…The total porosity ranges from 30.40% (siliceous sandstones) to 17.22% (carbonate sandstones) (Varas et al, 2003;Varas and Molina, 2004). Similar diagenetic processes have been studied for tertiary materials from the Arabian Gulf (Khalaf, 1990;Khalaf and Abdal, 1993), and more recently for the Palaeogene of Portugal (Pimentel, 2002).…”

Section: Materials: Ciudad Rodrigo Sandstonesmentioning

confidence: 97%

Role of canonical biplot method in the study of building stones: an example from Spanish monumental heritage

et al. 2005

View full text Add to dashboard Cite

SUMMARYIn this work, the canonical biplot (CB) method (Vicente-Villardón, 1992;Gower and Hand, 1996) is used to determine the origin, distribution, conservation and pollution state of the different types of stones used in the construction and restoration of monuments of great historical interest. The stone materials (sandstones) used in the Cathedral of Ciudad Rodrigo (Salamanca, Spain) have been used to assess the usefulness of the method. The age of this monument (eight centuries), together with the surrounding environmental conditions, have especially contributed to the pollution of the stone masonries, in comparison to the same stones identified in the original quarries. The CB method has allowed us to: (a) identify the sandstone varieties used in the construction; (b) locate the original quarries of these sandstones; (c) locate these materials in the building, and (d) detect the pollution and deterioration affecting the stones in the monument, in comparison to the stones of the original quarries.

show abstract

Occurrence of phreatic dolocrete within Tertiary clastic deposits of Kuwait, Arabian Gulf

Cited by 56 publications

References 14 publications

Dedolomitization of dolocrete deposits in Kuwait, Arabian Gulf

Dedolomitization of dolocrete deposits in Kuwait, Arabian Gulf

Evaluation of paleohydrologic models for terrestrial inverted channels: Implications for application to martian sinuous ridges

Role of canonical biplot method in the study of building stones: an example from Spanish monumental heritage

Contact Info

Product

Resources

About