 | | Journal (article/letter/editorial) | | closed-basin lacustrine environment: Case study Olduvai Gorge, Tanzania Lindsay J. McHenry ā Department of Geological...Accepted 22 May 2009 Editor: B. Bourdon Keywords: Olduvai Gorge Tephra Diagenesis Element mobility Alteration...r a c t PlioceneāPleistocene Bed I of Olduvai Gorge, Tanzania provides an ideal test for models of element...were collected across a transect of paleo-lake Olduvai, including authigenic K-feldspar and phillipsite...salineāalkaline lake basin, less altered phillipsite and chabazite-bearing samples from the intermittently dry lacustrine |  | | Journal (article/letter/editorial) | | ARGILLIC AND ZEOLITIC ALTERED TEPHRA, OLDUVAI GORGE, TANZANIA L IN D SA Y J . M C H E N R Y * Department...lacustrine altered tephra of Pleistocene Olduvai Gorge, Tanzania, and their diagenetic histories can be...authigenic minerals in the altered tephra of the Olduvai paleolake form a classic ābullās-eyeā pattern,...clay-dominated tephra in the distal lake margin, chabazite and phillipsite in the proximal margin, and phillipsite...WordsāClay, Diagenesis, Element Partitioning, Olduvai Gorge, Phillipsite, Saline-alkaline Lake, Smectite |  | Mees, Florias, Stoops, Georges, Van Ranst, Eric, Paepe, Roland, Van Overloop, Elfi (2005) The nature of zeolite occurrences in deposits of the Olduvai Basin, northern Tanzania. clays and clay minerals, 53 (6) 659-673 doi:10.1346/ccmn.2005.0530612 | Journal (article/letter/editorial) | | ZEOLITE OCCURRENCES IN DEPOSITS OF THE OLDUVAI BASIN, NORTHERN TANZANIA F LORIAS M EES 1, *, G EORGES S TOOPS...Plio-Pleistocene deposits of the Olduvai Basin in northern Tanzania consist of a sequence of lacustrine...main stratigraphical units that are recognized at Olduvai (Beds I to IV), sampled in the southeastern part...deposits of Bed I and the lower part of Bed II, chabazite is the dominant zeolite mineral accompanied by...minor amounts of erionite and clinoptilolite. Chabazite commonly occurs as part of altered volcanic rock |  | | Journal (article/letter/editorial) | | syngenetic or diagenetic origin ( I ) Analcime, chabazite, natrolite and phillipsite - about 0.2-1 km in...in a warm, rather arid region, frequently associated with phillipsite, chabazite and natrolite. The zeolites...Searles Lake in California and eolian tuff of the Olduvai Gorge in Tanganyika. At Searles Lake, phillipsite...1963a). Phillipsites of Searles Lake and the Olduvai Gorge have formed under an alkaline environment (pH...hydrothermal experiments, phillipsite was formed from chabazite at 255Ā°C (COOMBS et al., 1959); it is stable Sedimentology |  | | Report (chapter) | | have resulted from later regional mapping by the Tanzania Geological Survey, together with radiometric dating...shield volcanoes (Elanairobi, Olmoti, Loolmalasin, Ngorongoro, Oldeani, Gelai, Ketumbeine, Tarosero, Monduli...Kilimanjaro). Some of these basaltic volcanoes, Ngorongoro, Olmoti, Elanairobi (collectively termed the... 1972) but there is no equivalent in northern Tanzania of the earlier Kenyan flood phonolites, dated...in the Pleistocene sedimentary successions at Olduvai and Peninj. Rock nomenclature Most of the rock |  | | Report (chapter) | | (Rosendahl 1987) and in parts of Kenya, the northern Tanzania basins are not enclosed within opposed faults...lakes. Other sedimentation basins are those of Olduvai/Laetoli and Amboseli, and some small ones in the...tuffs record the Matuyama Epoch, including the Olduvai reversal at 1.87 ā 1.67 Ma (Thouveny & Taieb 1986)...Valley and Neogeneā Recent Volcanoes of Northern Tanzania. Geological Society, London, Memoirs, 33, 33ā38...poorly exposed, the main exposures being in the gorge of the Emugur Oretati (the river draining westwards |  | | Journal (article/letter/editorial) | | trachytic and nephelinitic tuff beds of the Olduvai Gorge lacustrine deposits, and further, compared them...discussed magma compositions in the Tanzanian Olduvai Gorge and the German Kaiserstuhl localities, suggesting...Formation, directly compared with beds of Lake Magadi, Tanzania), are demonstrative of occurrence patterns of...feeders for the saline lakes is overwhelming. This region is an important study area as most of the volcanic...western USA and the Canadian Mont St. Hilaire district, plus the Kola peninsula of Russia, Bolivian and |  | | Journal (article/letter/editorial) | | deposits of lakes Magadi and Matron in Kenya and Tanzania. The chert consists of finely crystalline quartz...the vicinity of Lake Magadi, Lake Natron, and Olduvai Gorge. Although magadiite and kenyaite are absent.... . . . . . . . . . . . . . Beds I and II, Olduvai Gorge . . . . . . . . . . . . . . . . . . . . . ....ka[inetake ~ . of Bed [ ~';~.~t%,, ,, .j 0[duvai Gorge j ~ # ,,,,,,,,,,,ir' ~ 0tdoinyo """'~Lengai m...deposits of the Eastern Rift Valley in K e n y a and Tanzania. This information shows t h a t all of the chert |  | | Journal (article/letter/editorial) | | volcanic glass in saiine, alkaline soils of Olduvai Gorge, Tanganyika. Phillipsite occurs both as lath...searlesite,K-feldspar, clinoptilolite, erionite, chabazite,natrolite, and dan-sonite. Phillipsite can form...ions predominate in present-day lakes of the same region. saline water rich in sodium carbonatenow seepsfrom...seepsfrom the Iake beds into the sidesof the gorge. soli,ne soils oJ olduaai Gorge.zeolites and dawsonite...have formed at the Iand surfacein the sidesof the olduvai Gorgeand over the adjacent part 1372 RICHARDL |  | | Journal (article/letter/editorial) | | cinerite of the central northern Apennines; (2) chabazite and phillipsite from the phonolitic tephritic...from the "tufo lionato" of Vulcano Laziale; (4)chabazite and phillipsite from the Campanian ignimbrite;...(5)phillipsite from the Neapolitan yellow tuff; and (6) chabazite and phillipsite from the pyroclastics of Monte...sedimentary rocks, although only nine (analcime, chabazite, clinoptilolite, erionite, ferrierite, heulandite...(Sersale et al. 1963; Gianello and Gottardi 1969) Chabazite (Boenzi et al. 1965; Lenzi and Passaglia 1974) |  | | Journal (article/letter/editorial) | | rhyolite and tuff. Offretite is a member of the Chabazite group of zeolite minerals. This unusual mineral...Oregon locality and was desĀ ported from Olduvai Gorge in Tanzania, cribed in 1898 by A. S. Eakle. For many...as fine white crystals often associated with chabazite or phillipsite. In my collection I have a specimen...units and reconĀ struct the geologic history of the region. Bibliography Dake, H. C. "Unusual and Rare Minerals |  | | Journal (article/letter/editorial) | | the formation of alkalic zeolites: phillipsite, chabazite, erionite, clinoptilolite, and mordenite. Following...relief) and deposited in the middle to outer neritic region of a normal marine environment (Drugg, 1967). It...zeolite reactions in Pleistocene deposits of Olduvai Gorge, Tanzania. Direct alteration of clay material to...three lithofacies of a semi-arid basin, Olduvai Gorge, Tanzania: MANUSCRIPT RECEIVED BY THE SOCIETY JULY |  | Alonso-Zarza, Ana M., Bustamante, Leticia, Huerta, Pedro, RodrĆguez-Berriguete, Ćlvaro, Huertas, MarĆa JosĆ© (2016) Chabazite and dolomite formation in a dolocrete profile: An example of a complex alkaline paragenesis in Lanzarote, Canary Islands. Sedimentary Geology, 337. 1-11 doi:10.1016/j.sedgeo.2016.02.018 | Journal (article/letter/editorial) | | journal homepage: www.elsevier.com/locate/sedgeo Chabazite and dolomite formation in a dolocrete proļ¬le:...mineralogical association, including Mg-carbonates and chabazite, rarely described in cal/dolocretes proļ¬les. Initial...allowed precipitation of coarse-zoned dolomite and chabazite ļ¬lling porosities. In Stages 3 and 4, mostly pedogenic...silica and Mg-rich alkaline waters, suitable for chabazite and dolomite formation, without a previous carbonate...association including calcite, dolomite, smectites and chabazite (zeolite), developed 2 A.M. Alonso-Zarza et |  | | Journal (article/letter/editorial) | | back more than 3 million years in the central Afar region of northeastern Ethiopia. The find is an "unparalleled"...human fossils were found in Africa at Olduvai gorge in Tanzania and Lake Rudolph by Louis S. B . Leakey...with the "near man" australopithecus in the Afar region. At a press conference at the AntiĀ quities Administration...radioactive potassium mineral inside. The Hadar region is dotted with towĀ ering volcanic deposits, some... They are, natrolite, meĀ solite, scolecite, chabazite, gmelinite, laumontite, stilbite, thomsonite, |  | | Journal (article/letter/editorial) | | (1967) to be thoseof an amorphousor band in this region may obscureweak reflections; showedits properties...differentmechanismfrom that whichhe proposedfor the OlduvaiGorge(Tanzania,Africa) dawsonite.For the GreenRiver,he proposesan...NaAlS.izoo. H,o * *"*lSo""Tl):"o, Elsewhere in Olduvai Gorge, in an "alkali carbonate ash bed" Hay (1970...suggestedthat dawsonite and natrolite form from chabazite and analcite; in a similar bed, nepheline is given...(1970)Silicatereactionsin threelithofaciesof a semi-aridbasin,Olduvai Gorge, Tanzania.Mineral. Soc.Am. Spec.Pap 3,23'l-255 |  | | Report (issue) | | stratigraphic terminology . William R. Farrand 1 15 Olduvai Gorge; A case history in the interpretation of hominid...habitats in East Africa. The sedimentary strata of Olduvai Gorge have produced a superb sequence of artifacts...paleoenvironmental analyses, bed by bed, within Olduvai Gorge strata. What makes Hayās discussion especially...weāve come to understand about the geology of Olduvai Gorge has been due to his own research efforts. B...the only true centers of learning, then in the region. How could an isolated provincial pharmacist have |  | | Journal (article/letter/editorial) | | sodium into the tuff with Hay's estimated age of Olduvai Gorge zeolitic tufi alteration of from 8000 to 20...smaller than 2.1 cmf yr becauserainfall at olduvai Gorge is intermittent. considering, then, that the...Mass action relationships of some zeolites in the region of high competing cation concentrations. A m. M...lurroN (1955) Exchange equilibria in crystals of chabazite. Iotu. Chem' Soc. London,2838-2849. Coours, D...42, 199-262. -(1963b) Zeolitic weathering in Olduvai Gorge, Tanganyika' Geol'.Soe. Am. Bull 74, 1281-1286 |  | | Journal (article/letter/editorial) | | kaolinization of the Hercynian granites of this region, the following facts a r e cited: 1. The great...associated the formation of the kaolin deposits of this region with Tertiary weathering, although he believed...minerals. For example, in the continental part of Tanzania, they formed as a result of weathering of eolian...nepheline tuffs here include phillipsite, natrolite, chabazite, and analcime, which are associated with dawsonite;...to the formation of phillipsite, erionite, and chabazite (Hay, 1963). There is a lot of information on |  | | Journal (article/letter/editorial) | | supported by the presence of phillipsite and chabazite zeolites and the occurrence of protodolomitie...oolites, the zeolites phillipsite (Fig. 5 a) and chabazite (Fig. 5 b) are present in the silt fraction of...cm core depth) of core A 1 a) Phillipsite b) Chabazite c) surface of protodolomitic oolites revealing...volcanic glass is altered to a potassium-rich chabazite and phillipsite. These reactions are well documented...8--13, 1956. HAY, R. L.: Zeolitic weathering in Olduvai Gorge, Tanganyika. Bull. Geol. Soc. Amer. 74, p. 1281--1286 |  | | Journal (article/letter/editorial) | | minerals are detectedrarely: opalCT, erionite, chabazite,phillipsite, biotite, chlorite, and albite (Stamatakis...Kjeldspar (MJ),high sanidine(MD) Kjeldspar (MJ),chabazite(TR),erionite(TR), illite(TR) Kjeldspar (MJ),chloriteOR)...three lithofacies of a semi-arid basin, Olduvai Gorge, Tanzania. Mineralogical Society of America Special |  | | Book | | . ... . . ... . .. . .. . . .... . . . . .. Chabazite, Willhendersonite . . . . . . . . . . . . . ....the zeolite names with their present meaning Chabazite: Bosc d' Antic (1792) Stilbite: Haiiy (1801) Analcime:...Sequence AABBCC ... of parallel 6-rings R3m Chabazite R3m LEV Sequence AABCCABBC ... of parallel...the gmelinite cage (y-cage of Meier 1968) the chabazite cage the levyne cage the erionite cage the a-cage...cage. h - The gmelinite cage (y-cage). i-The chabazite cage. j - The levyne cage. k - The erionite cage |  | | Report (issue) | | Analcime _____________________________________ _ Chabazite _____________________________________ _ Clay minerals...tuffs of Lake Tecopa_______ X-ray powder data for chabazite from tuff B_________________________________ Chemical...east, and Barstow, 80 airamounts, analcime and chabazite. Clay minerals are nearly line miles to the southwest... 28, IN DEGREES 40 30 0 10 20 Analcime Chabazite Clinoptilolite Erionite Phillipsite Potassium...samples are from Lake Tecopa except analcime and chabazite, which are from altered tuffs of the Barstow Formation |  | | Report (issue) | | three lithofacies of asemi-arid basin, Olduvai Gorge, Tanzania.......... Richard L. Hay 237 Saluceyetallizauon...but the peridotite model is weakly favored in the region near 300 kms depth. Press concluded that between...element results when the mineralogy of the source region is uncertain. PERIDOTITE MINERALOGY, FIELD ASSOCIATIONS...mountain chain proper, that is, in the Mediterranean region. In particular, the ophiolite sequence so spectacularly...in peridotite nodules from Lashaine volcano, in Tanzania. The presence of amphibole in the mantle is indicated |  | | Report (issue) | | and clinoptilolite, but local concentrations of chabazite, erionite, mordenite, and phillipsite have also... i " r ""- 1 Analcime 1 , 1 1 1 I 1 Chabazite ..... ,1 .ll , | i | Clinoptilolite , ...bath in an attempt to remove adhering authigenic chabazite and montmorillonite. This treatment was only partly...the other zeolites, but the association with chabazite is rare. Analcime is also commonly associated...from Hay (1966, p. 7); however, the formulas for chabazite, clinoptilolite, and erionite are modified from |  | | Report (issue) | | "Zeolites in Upper Paleozoic formations of the Koibyn Gorge (southern Kazakhstan)." Doklady Akademii Nauk SSSR...gaseous effluents. 1. Sulfur dioxide adsorption on chabazite tuff." Inquinamento 22(5): 41-44. Zeolite ...R., C. Colella and A. Nastro (1980). "Natural chabazite for iron and manganese removal from water." Spec...deposits of possible economic value in the Campanian region." Rendiconto dell'Accademia delle Scienze Fisiche... Origin of optical variation in analcime and chabazite. Proceedings of the 5th International Zeolite |
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