CHEMICAL GEOLOGY ELSEVIER ISOTOPE GEOSCIENCE Chemical Geology 158 (1999) 341-342 Contents Volume 158, 1999 Vol. 158, Nos. 1-2 Research Papers 3-Alkyl and 3-carboxyalkyl steranes in marine evaporitic oils of the Potiguar Basin, Brazi J.A.D. Lopes, E.V. Santos Neto, M.R. Mello, L. Koike, A.J. Marsaioli and F. de A.M. Reis. Behaviour of rare earth elements during seawater basalt interactions in the Mururoa Massif C. Guy, V. Daux and J. Schott. Lake Kinneret (The Sea of Galilee): the effects of diversion of external salinity sources and the probable chemical composition of the internal salinity sources A. Nishri, M. Stiller, A. Rimmer, Y. Geifman and M. Krom. eee ET ee ge ee de ec eee Sequential leachates of multiple grain size fractions from a clay-rich till, So e itchewan, Canada: implications for controls on the rare earth element geochemistry of porewaters in an aquitard X.-P. Yan, R. Kerrich and M.J. Hendry . este. ereaer eee Structural chemistry of uranium associated with Si, Al, Fe gels in a granitic uranium mine lr. Allard, P. Ildefonse, C. Beaucaire and G. rei eth ces endl tana aa mes . The speciation of Ni and Co in silicate melts from optical sheerpticin spectra to 15( 10° H. Keppler and N. Bagdassarov Book Review Borates; Handbook of Deposits, Processing, Properties, and Use by Donald E. Garrett, Academia Press, 483 p, (ISBN 0-12-276060-3) A. Vengosh. Isotope Geoscience Section Carbon isotope behaviour in wood and cellulose during artificial aging G.H. Schleser, J. Frielingsdorf and A. Blair. : ee ae ee ee Boron isotope systematics of te e formation in the Sallie Pb -Zn—Ag deposit, British Columbia, Canada S.-Y. Jiang, M.R. Palmer, J.F. Slack and D.R. Shaw pce Accurate and precise Geeiadi tion of Li isotopic compositions by “a oalivene sector Ic p-M S P.B. Tomascak, R.W. Carlson and S.B. Shirey - Origin of barite concretions in the West Carpathian flysch, Pol- P.M. Lesniak, B. Lacka, J. Hladikova and G. Zielinski . Vol. 158, Nos. 3- Research Papers Is selective preservation of nitrogenous organic matter reflected in the 5 C signal of lacustrine sediments? R.V. Krishnamurthy, K. Syrup and A. Long ae ce ; ee be leue tere fe EN Weer ie Grain size separation and sediment mixing in Arctic Ocean sctteniiane evidence from the strontium isotope systematic A. Eisenhauer, H. Meyer, V. Rachold, T. Tutken, B. Wiegand, B.T. Hansen, R.F. Spielhagen, F. Lindemann and H. Kassens . . Bacterial effects o« n the mobilization of cations any?a weathered Pb-contaminated andesite J.B. Fein, P.V. Brady, J.C. Jain, R.I. Dorn and J.-U. Lee. . . : ; ‘ Chemistry, paragenesis and significance of tourmz oe in pegmatites oft he Scien Tin Belt, central Namibia P. Keller, E.R. Robles, A.P. Pérez and F. Fontan. . . Barium-rich authigenic clinoptilolite in sediments from the ii pan ine “ for datved techn? T.H. Nahr and G. Bohrmann. . . 342 Contents Volume 158, 1999 Experimental determination of the solubility of ReO, and the dominant oxidation state of rhenium in hydrothermal solutions Y. XiongandS.A.Wood ........ Evidence of bacterial activity from micrometer-scale layer analyses of black-smoker sulfide structures (Pito Seamount Site, Easter microplate) C. Verati, P. de Donato, D. Prieur and J. Lancelot NanpipSusbin®: Mek RG ics. Soi cere Whadle tS ae clea tae hs meee Goi aetats Provenance of the north Pacific sediments and process of source material transport as derived from Rb-Sr isotopic systematics Y. Asahara, T. Tanaka, H. Kamioka, A. Nishimura and T. Yamazaki . gO isirk ch a is Scar ole aes nee wae Oe ES Geochemistry of Permian-Triassic shales in the Salt Range, Pakistan: implications for provenance and tectonism at the Gondwana margin S. Hassan, H. Ishiga, B.P. Roser, K. Dozen and T. Naka. BU sate esta ee) pene PA aera Ferruginous concretions in a Late Cretaceous karst bauxite: composition and conditions of formation G. Mongelli and P. Acquafredda. Book Review Review of ‘Kinetic Theory in the Earth Sciences’ E.H. Oelkers Isotope Geoscience Section Th/U zonation in zircon derived from evaporation analysis: a model and its implications U.S. Klotzli. Acknowledgement to referees, 1998 . Contents Volume 158, 1999 Breeaisn Be