Low-temperature alteration of volcanic glass: Hydration, Na, K, 18O and Ar mobility

Bigeleisen, 1952, Conversion of hydrogenic materials to hydrogen for isotopic analysis, Anal. Chem., 24, 1356, 10.1021/ac60068a025 Brotzu, 1980, Volcanological and magmatological evidence of the Boseti volcanic complex (Main Ethiopian Rift), 317 Brown, 1982, Stratigraphical significance of the Tulu Bor Tuff of the Koobi Fora Formation, Nature (London), 299, 212, 10.1038/299212a0 Cerling, 1982, Tuffaceous marker horizons in the Koobi Fora region and the Lower Omo Valley, Nature (London), 299, 216, 10.1038/299216a0 Cerling, 1979, Preliminary correlations between the Koobi Fora and Shungura Formations, East Africa, Nature (London), 279, 118, 10.1038/279118a0 Clayton, 1963, The use of bromine pentafluoride in the extraction of oxygen from oxides and silicates for isotopic analysis, Geochim. Cosmochim. Acta, 27, 43, 10.1016/0016-7037(63)90071-1 Craig, 1961, Standard for reporting concentrations of deuterium and oxygen-18 in natural waters, Science, 133, 1833, 10.1126/science.133.3467.1833 Curtis, 1975, Age of KBS Tuff in Koobi Fora Formation, northern Kenya, Nature (London), 258, 395, 10.1038/258395a0 Di Paola, 1972, The Ethiopian Rift Valley (between 7°00′ and 8°4′ lat. North), Bull. Volcanol., 36, 517, 10.1007/BF02599823 Drake, 1980, KBS Tuff dating and geochronology of tuffaceous sediments in the Koobi Fora and Shungura Formations, East Africa, Nature (London), 283, 368, 10.1038/283368a0 Friedman, 1958, The deuterium content of water in some volcanic glasses, Geochim. Cosmochim. Acts, 15, 218, 10.1016/0016-7037(58)90059-0 Garlick, 1970, Oxygen isotope exchange between volcanic materials and ocean water, Geol. Soc. Am. Bull., 81, 2137, 10.1130/0016-7606(1970)81[2137:OIEBVM]2.0.CO;2 Gibson, 1974, A review of the geology, petrology and geochemistry of the volcano Fantale, Bull. Volcanol., 38, 791, 10.1007/BF02596908 Gleadow, 1980, Fission track age of the KBS Tuff and associated hominid remains in northern Kenya, Nature (London), 284, 225, 10.1038/284225a0 Hall, 1984, Geochronology, stratigraphy, and geochemistry of Cindery Tuff in Pliocene hominid-bearing sediments of the Middle Awash, Ethiopia, Nature (London), 308, 26, 10.1038/308026a0 Huneke, 1978, 40Ar-39Ar microanalysis of single 74220 glass balls and 72435 breccia clasts, 2345 Jezek, 1978, Natural hydration and ion exchange of obsidian: an electron microprobe study, Am. Mineral., 63, 266 Kaneoka, 1972, The effect of hydration on the K/Ar ages of volcanic rocks, Earth Planet. Sci. Lett., 14, 216, 10.1016/0012-821X(72)90009-X Mahood, 1982, KAr dating of young rhyolitic rocks: a case study of the Sierra La Primavera, Jalisco, Mexico, Geol. Soc. Am. Bull., 93, 1232, 10.1130/0016-7606(1982)93<1232:KDYRRA>2.0.CO;2 McDougall, 1981, 40Ar/39Ar age spectra from the KBS Tuff, Koobi Fora Formation, Nature (London), 294, 120, 10.1038/294120a0 McDougall, 1985, KAr and 40Ar/39Ar dating of the hominid-bearing Plio-Pleistocene sequence at Koobi Fora, Lake Turkana, Kenya, Geol. Soc. Am. Bull., 96, 159, 10.1130/0016-7606(1985)96<159:KAADOT>2.0.CO;2 McDougall, 1980, KAr age estimate for the KBS Tuff, East Turkana, Kenya, Nature (London), 284, 230, 10.1038/284230a0 Melson, 1973, Glassy abyssal basalts, Atlantic sea floor near St. Paul's Rocks: petrography and composition of secondary clay minerals, Geol. Soc. Am. Bull., 84, 703, 10.1130/0016-7606(1973)84<703:GABASF>2.0.CO;2 Muehlenbachs, 1980, The alteration and aging of the basaltic layer of the sea floor: oxygen isotopic evidence from DSDP/IPOD Legs 51, 52, and 53, Vols. 51, 52, and 53, 1159 Noble, 1967, Sodium, potassium, and ferrous iron contents of some secondarily hydrated natural silicic glasses, Am. Mineral., 52, 280 Noble, 1970, Loss of sodium from crystallized comendite welded tuffs of the Miocene Grouse Canyon Member of the Belted Range Tuff, Nevada, Geol. Soc. Am. Bull., 81, 2677, 10.1130/0016-7606(1970)81[2677:LOSFCC]2.0.CO;2 Ozima, 1977, Sea water weathering effect on KAr age of submarine basalts, Geochim. Cosmochim. Acta, 41, 453, 10.1016/0016-7037(77)90284-8 Plieninger, 1976, Laser probe 39Ar-40Ar ages of individual mineral grains in lunar basalt 15607 and lunar breccia 15465, 2055 Stolper, 1982, Water in silicate glasses: an infrared study, Contrib. Mineral. Petrol., 81, 1, 10.1007/BF00371154 Taieb, 1976, Geological and paleontological background of Hadar hominid site, Afar, Ethiopia, Nature (London), 260, 289, 10.1038/260289a0 Taylor, 1968, The oxygen isotope geochemistry of igneous rocks, Contrib. Mineral. Petrol., 19, 1, 10.1007/BF00371729 Taylor, 1977, Water/rock interactions and the origin of H2O in granitic batholiths, J. Geol. Soc., London, 133, 509, 10.1144/gsjgs.133.6.0509