WorldCat Identities

WoldeGabriel, Giday

Overview
Works: 12 works in 20 publications in 1 language and 1,255 library holdings
Genres: Nonfiction television programs  Science television programs  Documentary television programs  Educational television programs 
Roles: Author
Publication Timeline
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Most widely held works about Giday WoldeGabriel
 
Most widely held works by Giday WoldeGabriel
Ardipithecus kadabba : late Miocene evidence from the Middle Awash, Ethiopia( )

6 editions published between 2008 and 2009 in English and held by 1,242 WorldCat member libraries worldwide

The second volume in a series dedicated to fossil discoveries made in the Afar region of Ethiopia, this work contains the definitive description of the geological context and paleoenvironment of the early hominid Ardipithecus kadabba. This research by an international team describes Middle Awash late Miocene faunal assemblages recovered from sediments firmly dated to between 5.2 and 5.8 million years ago. Compared to other assemblages of similar age, the Middle Awash record is unparalleled in taxonomic diversity, composed of 2,760 specimens representing at least sixty five mammalian genera. Th
Mineralogy and clinoptilolite K/Ar results from Yucca Mountain, Nevada, USA : a potential high-level radioactive waste repository site( Book )

1 edition published in 1993 in English and held by 5 WorldCat member libraries worldwide

Volcanotectonic history of the central sector of the main Ethiopian Rift : a geochronological, geochemical and petrological approach by Giday WoldeGabriel( )

4 editions published in 1987 in English and held by 4 WorldCat member libraries worldwide

Ion exchange and dehydration experimental studies of clinoptilolite : implications to zeolite dating by Giday WoldeGabriel( Book )

1 edition published in 1995 in English and held by 4 WorldCat member libraries worldwide

Variable effects were noted on the argon (Ar) and potassium (K) contents of clinoptilolite fractions used in ion-exchange and dehydration experiments. The K contents of clinoptilolite fractions were differently affected during cation exchange with Ca-, Cs-, K-, and Na-chloride solutions. Ar was generally less affected during these experiments, except for a Na-clinoptitolite fraction exchanged for five days. Loss of Ar during organic heavy-liquid treatment and cleaning using acetone and deionized water does occur, as indicated by comparing the amounts of radiogenic Ar of treated and untreated fractions. Moreover, a regular decrease in radiogenic Ar contents was noted in clinoptilolite fractions during dehydration experiments at different temperatures for 16 hours. Comparable losses do not occur from saturated samples that were heated in 100 C for more than five months. Water appears to play a vital role in stabilizing the clinoptilolite framework structure and in the retention of Ar. The radiogenic Ar depletion pattern noted in clinoptilolite fractions dehydrated in unsaturated environment at different temperatures is similar to variations in the amount of radiogenic Ar observed in clinoptilolite samples from the unsaturated zone of an altered tuff. These results can be used to evaluate the extent of zeolitic water (and hence Ar) retention in unsaturated geologic settings. The utility of alkali zeolites (e.g., phillipsite, clinoptilolite, and mordenite) from low-temperature, open-hydrologic alteration as potential dateable minerals was evaluated using the K/Ar method as part of the Yucca Mountain Site Characterization Project, which is evaluating Yucca Mountain, Nevada, as a potential high-level radioactive waste repository site
Ecological and temporal placement of early Pliocene hominids at Aramis, Ethiopia( )

1 edition published in 1994 in English and held by 1 WorldCat member library worldwide

Menschenphylogenie - Äthiopien - Pliozän
Ardipithecus : discovering Ardi( Visual )

1 edition published in 2010 in English and held by 1 WorldCat member library worldwide

Documents the discovery of a 4.4-million-year-old hominid skeleton nicknamed "Ardi" in Ethiopia's Afar region, including 3D recreations that bring Ardi and her world to life
Ardipithecus Kadabba: Late Miocene Evidence from the Middle Awash, Ethiopia (The Middle Awash series) by Giday WoldeGabriel( Book )

1 edition published in 2009 in English and held by 1 WorldCat member library worldwide

Early Pleistocene Homo erectus fossils from Konso, southern Ethiopia by Gen Suwa( )

1 edition published in 2007 in English and held by 1 WorldCat member library worldwide

Geology and palaeontology of the late miocene middle awash valley, afar rift, Ethiopia by Giday WoldeGabriel( )

1 edition published in 2001 in English and held by 0 WorldCat member libraries worldwide

Hydrothermal systems in two areas of the Jemez volcanic field : Sulphur Springs and the Cochiti mining district by Giday WoldeGabriel( Book )

1 edition published in 1989 in English and held by 0 WorldCat member libraries worldwide

K/Ar dates and oxygen isotope data were obtained on 13 clay separates (<2 .mu.m) of thermally altered mafic and silicic rocks from the Cochiti mining district (SE Jemez Mountains) and Continental Scientific Drilling Project (CSDP) core hole VC-2A (Sulphur Springs, Valles caldera). Illite with K₂O contents of 6.68%--10.04% is the dominant clay in the silicic rocks, whereas interstratified illite/smectites containing 1.4%--5.74% K₂O constitute the altered andesites. Two hydrothermal alteration events are recognized at the Cochiti area (8.07 m.y., n = 1, and 6.5--5.6 m.y., n = 6). The older event correlates with the waning stages of Paliza Canyon Formation andesite volcanism (greater than or equal to13 to less than or equal to8.5 m.y.), whereas the younger event correlates with intrusions and gold- and silver-bearing quartz veins associated with the Bearhead Rhyolite (7.54--5.8 m.y.). The majority of K/Ar dates in the hydrothermally altered, caldera-fill rocks of core hole VC-2A (0.83--0.66 m.y., n = 4) indicate that hydrothermal alteration developed contemporaneously with resurgence and ring fracture Valles Rhyolite domes (0.89--0.54 m.y.). One date of 0 +- 0.10 m.y. in acid-altered landslide debris of postcaldera tuffs from the upper 13 m of the core hole probably correlates with Holocene hydrothermal activity possibly associated with the final phases of the Valles Rhyolite (0.13 m.y.)
 
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Audience level: 0.03 (from 0.02 for Ardipithec ... to 1.00 for Geology an ...)

Ardipithecus kadabba : late Miocene evidence from the Middle Awash, Ethiopia
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English (19)