 | 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...various amounts of chabazite, phillipsite and natrolite. All zeolite minerals mainly occur in pores. The...Words ÐAnalcime, Chabazite, Diagenesis, Olduvai, Phillipsite, Tanzania, Zeolites. Abstract INTRODUCTION |  | | 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 – 1.67 Ma (Thouveny & Taieb 1986)...Valley and Neogene– Recent Volcanoes of Northern Tanzania. Geological Society, London, Memoirs, 33, 33–38...poorly exposed, the main exposures being in the gorge of the Emugur Oretati (the river draining westwards |  | | Journal (article/letter/editorial) | | diagenetic origin ( I ) Analcime, chabazite, natrolite and phillipsite - about 0.2-1 km in depth .___...warm, rather arid region, frequently associated with phillipsite, chabazite and natrolite. The zeolites are...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...analciine, 2 chlorite. ._ Calif., U.S.A. (2) Olduvai Gorge, Tanzania (3) 16"36'S, 162"43'W, Pacific Ocean (4) |  | | Journal (article/letter/editorial) | | volcanic glass in saiine, alkaline soils of Olduvai Gorge, Tanganyika. Phillipsite occurs both as lath...K-feldspar, clinoptilolite, erionite, chabazite,natrolite, and dan-sonite. Phillipsite can form in a few...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) | | weathered Pleistocene ash bedsin OlduvaiGorge,Tanzania,East Africa. The five otherknownoccurrences in...and in the weathered nephelinesyenitetuffs of Olduvai Gorge,Tanganyika,by Hay (9). More recently,Mandarinoand...Na•Al•SiaOx0.2H•O. nepheline dawsonire natrolite Natrolite accompanies the African dawsonite;in Colorado...sodium,the resultingzeolite accompanying dawsonite,natrolite in Africa and analcitein Colorado,appearsto be...Thus the African associationof dawsonite with natrolite (lower relative C02) agrees with the known ge |  | | Journal (article/letter/editorial) | | the Doroninskaya Group Lakes, Eastern Transbaikal Region S. V. Borzenko Institute of Natural Resources,...mineral has not been found yet in the Transbaikal region. It is generally accepted that it is formed in... 3, etc.]. The presence of albite, analcime, natrolite, and other hydrous zeolites together with gaylussite...Sirles lakes in California, Natron and Olduvai Gorge lakes in Tanzania, and others) [4]. According to recent...three lithofacies of a semiarid basin, Olduvai Gorge, Tanzania,” Min. Soc. Amer. Sp. Pap. 3, 237–255 (1970) |  | | 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...(1970, p. 251) suggestedthat dawsonite and natrolite form from chabazite and analcite; in a similar bed, nepheline...nepheline is given as the source of dawsonite and natrolite. Hay does not consider Al(OH)s (gibbsite specifically) |  | | 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 Anti quities Administration...radioactive potassium mineral inside. The Hadar region is dotted with tow ering volcanic deposits, some...are found in New Jersey traprocks. They are, natrolite, me solite, scolecite, chabazite, gmelinite, |  | | Journal (article/letter/editorial) | | work of Hay (1963) on the salinesoilsat Olduvai Gorge in Tanzania, Smith and Milton (1966) on the Green...from only three localitiesin the world: Olduvai Gorgein Tanzania,the Green River Formation in Coloradoand...Wales. According to Hay (1963) the dawsoniteat Olduvai Gorgehas resulted from the reaction of sodium carbonate...Colorado-Smith & Milton (1966). Iine environment. Natrolite, other zeolites and carbonates are associated...Hnv, R. L. (1963) Zeolitic weathering in Olduvai Gorge, Tanzania. Geol.Soc' Amu' BuJI' 74, 128l-1286. Loucnw |  | | 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...supergene zeolites ( phillipsite, thomsonite, and natrolite) a r e typical minerals of the gently dipping...zeolites are smectites, francolite, and iron oxides. Natrolite formed later than francolite. Other investigators...minerals. For example, in the continental part of Tanzania, they formed as a result of weathering of eolian |  | | Journal (article/letter/editorial) | | Turkey Abstract—Very unusual rocks consisting of natrolite (>95 vol.%) ? pargasite (<5 vol.%) and rare albite...intermediate primary igneous plagioclase to produce natrolite. The metasomatic alteration produced concentric...quartz). Transition Zone 2 comprises natrolite-bearing diorite (natrolite ? albite ? andesine ? pargasite...Zone 3 is a rock made up almost entirely of natrolite (natrolite ? pargasite ? albite ? calcite ? chlorite)...partial to complete replacement of plagioclase by natrolite with or without rare albite. The natrolites exhibit |  | | Book | | Fibrous Zeolites .......................... Natrolite, Tetranatrolite, Paranatrolite, Mesolite, Scolecite...Analcime: Haiiy (1801) Harmotome: Haiiy (1801) Natrolite: Klaproth (1803) Laumontite: Werner (in Karsten...(1960) Roggianite: Passaglia (1969) Tetragonal natrolite: Krogh Andersen et al. (1969) named tetranatrolite...chains are represented as in Fig. O.2Bb. c - Natrolite 0.2.1 The Frameworks of the Fibrous Zeolites...Thomsonite P42 1m or P2 12121 Pcnn 141 /amd Natrolite Fdd2 THO NAT Note: reviews of real and possible |  | | 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 (chapter) | | oxide, opaline silica and zeolite (analcime, natrolite) cements, especially where groundwater is shallow...dominated by the Lake Bogoria escarpment. This region is composed of trachytic, phonolitic and basaltic...rift floor comprises an intensely grid-faulted region of Pleistocene trachyphonolite and basaltic lavas...dominantly analcime (NaA1Si206"H20), but with minor natrolite (NazAI2 Si3Om-2H20), formed in a delta-plain soil...Illite-smectite Chlorite Magadiite Kanemite Analcime Natrolite Clinoptilolite Mordenite Thomsonite Limonite Goethite |  | | Journal (article/letter/editorial) | | syenite tuffs of Olduvai Gorge, Tanzania, East Africa (Hay, 1963) associated with natrolite (Na2Al2Si3O10...quantities of CO2) will buffer the pH and drive it to the region where dawsonite dominates over either boehmite...305–309. Hay R. L. (1963) Zeolitic weathering in Olduvai Gorge, Tanganyika. Geol. Soc. Am. Bull. 74, 1281–1286 |  | | Report (volume) | | Col 1, Yufutsu gas field region should read “Yufutsu oil and gas field region” [Similar correction needed...T5010 UNITS: THE FIBROUS ZEOLITES Natrolite group (NAT): natrolite, scolecite, mesolite, gonnardite,.............................................95 Natrolite: N a16[A116Si24080]·1 6H20 . . .. . . ... ......to the channel cations. An example of this is natrolite Na16[Al16Si24O80]·16H2O, mesolite Na16Ca16[Al48Si72O240]·64H2O...given priority in the naming. The frameworks of natrolite, mesolite, scolecite, and gonnardite are all identical |  | | Report (issue) | | "Zeolites in Upper Paleozoic formations of the Koibyn Gorge (southern Kazakhstan)." Doklady Akademii Nauk SSSR...deposits of possible economic value in the Campanian region." Rendiconto dell'Accademia delle Scienze Fisiche... Vezzalini (1982). "The crystal chemistry of natrolite, mesolite and scolecite." Neues Jahrbuch fuer...G. Vezzalini (1981). "A partially disordered natrolite: Relationships between cell parameters and Si-AI...139-152. Barker, C. E. (1980). "The Terry borate district, Amargosa Valley, Inyo County, California." California |  | | Journal (issue) | | near-IK fibre-optic probe accessory 307307 Natrolite from the Bela ophiolite, Pakistan E. Gnos1, K...Bern, Switzerland ABSTRACT: The zeolite mineral natrolite was found as fracture filling in a slightly boudinaged...serpentinized harzburgite WSW of Hazarganji, Khuzdar District, SW Pakistan. The mineral occurs as acicular,...indicate a structurally highly (Si,Al)-ordered natrolite and this is consistent with the low temperature...associated minerals. Keywords: Bela ophiolite, natrolite, Pakistan, rodingite, zeolite 308 Introduction |  | Zalba, Patricia Eugenia, Conconi, María Susana, Morosi, Martín, Manassero, Marcelo, Comerio, Marcos (2011) Dawsonite in Tuffs and Litharenites of the Cerro Castano Member, Cerro Barcino Formation, Chubut group (Cenomanian), Los Altares, Patagonia, Argentina. The Canadian Mineralogist, 49 (2) 503-520 doi:10.3749/canmin.49.2.503 | Journal (article/letter/editorial) | | rift type. The gabbros bear “analcime, possible natrolite, and medium to sodium labradorite” (Fernández... Hay, R.L. (1963): Zeolitic weathering in Olduvai Gorge, Tanganyika. Geol. Soc. Am., Bull., 74, 1281-1286...zeolite occurrences in deposits of the Olduvai Basin, northern Tanzania. Clays Clay Minerals 53, 659-673. |  | | Book | | big as tree trunks from the Halliburton-Bancroft district of Ontario. The giants in museums are far from...Toolmakers of Olduvai Gorge When in 1953 L.S.B. Leakey and his wife began their work in Olduvai Gorge in what...what is now the Republic of Tanzania, they found evidence that the region had been the dwelling place of...deposits and the beds of volcanic ash in which the Olduvai Gorge is carved. Some of these individuals are members...ancestry. These are presumably the toolmakers of Olduvai Gorge, Desert attest to the skill and the species |  | | Report (volume) | | Structures Chabazite . Group 5 (T5010 Units) . Natrolite, Scolecite, Mesolite . Thomsonite, Gonnardite...Outcrop specimens of zeolitfc tuff in the Mohave Region of southern California, for example, are noticeably...Orthorhombic 2B 2.12-2.15 2.9 x 5.7 High 2.29 NATROLITE Na16(Al16Si240S0)x16H20 Or:thorhombic 23 2...Group 5 (TS01o)i NaI6[(AI02h6(Si02)24J '16 H2O Natrolite Cas [(A102h6(Si02)24J '24 H2O Seoleeite Na16Ca16...Wairaldte. leucite, pollucite, viscitc, kchoitc Natrolite group Nutr olite Thomsonu e Edingtonue Na |  | | Book | | composition was found between the fibrous zeOlites, natrolite, mesolite, and scolecite because intergrown samples...chabazite rather than willhendersonite or disordered natrolite rather than tetranatrolite. Application of the...bikitaite, edingtonite, ferrierite, mordenite, natrolite, thomsonite, tschernichite, and wairakite. Species...and gobbinsite), heulandite (clinoptilolite), natrolite (mesolite and scolecite), harmotome (phillipsite...retained as a species. ZEOLITES DEFINED /7 NATROLITE GROUP Natrolite, mesolite, scolecite, tetranatrolite, | | | Book | | composition was found between the fibrous zeOlites, natrolite, mesolite, and scolecite because intergrown samples...chabazite rather than willhendersonite or disordered natrolite rather than tetranatrolite. Application of the...bikitaite, edingtonite, ferrierite, mordenite, natrolite, thomsonite, tschernichite, and wairakite. Species...and gobbinsite), heulandite (clinoptilolite), natrolite (mesolite and scolecite), harmotome (phillipsite...retained as a species. ZEOLITES DEFINED /7 NATROLITE GROUP Natrolite, mesolite, scolecite, tetranatrolite, |  | Sand, L. B., Mumpton, F. A. - Eds. (1978) Natural Zeolites - Occurrence, Properties, Use - A selection of papers presented at Zeolite, 76, an International Conference on the Occurrence, Properties, and Utilization of Natural Zeolites, Tucson, Arizona, June 1976. Pergamon Press, Oxford. | Book | | Eugster, 1976), Lake Natron, Tanzania (Hay, 1966), and Olduvai Gorge, Tanzania (Hay, 1970) display this same...diagenetic deposits, are widespread in the Green Tuff region of Japan, and commonly reach thicknesses of several...Ontario. In Hungary, clinoptilolite from the Tokaj region has been used to encapsulate Sr 90 for solid-waste...1972a), an altered volcanic tuff from the Eifel Region of Germany, marketed for more than 30 years as...in chabazite and phillipsite are known from this region, and it is likely that the tuff in question contains |  | | Journal (issue) | | You, Donors FEATURE ARTICLE 80 Gem Wealth of Tanzania Dona M. Dirlam, Elise B. Misiorowski, Rosemary...ABOUT THE COVER: Over the last three decades, Tanzania-the subject of the lead article in this issue-has...of gem-quaLity diamonds, rubies, and sapphires, Tanzania is perhaps best known for its production of the...nation of Tanzania has great gem wealth. First known by Westerners for its diamonds, Tanzania emerged in...De Beers has reinstated diamond exploration in Tanzania, n e w gem materials such as transparent green |
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