Geochemistry International, 1999, V 37, N 8.

The Causes of the Global Variations of Carbon Isotopic 
Composition in the Biosphere
E. M. Galimov 
p. 699 

Distribution of Temperature and Elastic Wave Velocities
in a Model of the Chemically Differentiated Moon
V. A. Kronrod and O. L. Kuskov 
p. 714 

Estimated Chemical Composition and Petrochemical
Evolution of the Upper Continental Crust
L. S. Borodin 
p. 723 

The Magma Composition and Genesis of Theralite from the Mushugai
Khuduk Carbonatite-bearing Complex in Southern Mongolia
I. A. Andreeva, V. B. Naumov, V. I. Kovalenko, and N. N. Kononkova 
p. 735 

Early Precambrian Tectono-Thermal Evolution of the Earth Crust
in the Karelian and Belomorian Provinces of the Baltic Shield:
U–Pb Isotopic Evidence from Sphene and Rutile
E. V. Bibikova, A. I. Slabunov, S. V. Bogdanova, and T. Skiold 
p. 750 

Mössbauer Spectroscopy as Applied to Isotopic Geochemistry:
I. Equilibrium Fractionation of Iron Isotopes
V. B. Polyakov and S. D. Mineev 
p. 765 

Double  Decay of 130Te: A New Isotopic Geochronometer 
for Gold Mineralization
M. M. Fugzan and Yu. A. Shukolyukov 
p. 777 

Solid Bitumens of the Bazhenovo Formation of the West Siberian Plate
and Their Main Geochemical Features
A. E. Kontorovich, Yu. N. Zanin, V. N. Melenevskii,A. G. Zamirailova, 
A. N. Fomin, and D. Yu. Davydov 
p. 792 

Application of the Virial Equation for the Thermodynamic Description
of the Properties of Aqueous Electrolytes
in a Wide Range of State Parameters N. N. Akinfiev p. 800

Short Communications

Formation of the Isotopic Composition of Sulfate Oxygen and Sulfur upon Microbial Reduction: A Case Study of the Black Sea and the Sivash V. A. Grinenko and V. I. Ustinov p. 809 Thermal Atomic Absorption Analysis as Applied to Study the State of an Impurity in a Solid in the Range of Small Concentrations and to Assess the Miscibility Limits V. L. Tauson, V. I. Men’shikov, I. Yu. Parkhomenko, and K. V. Nepomnyashchikh p. 812