Contents
Geochemistry International

Vol. 35, No. 6, 1997

Simultaneous English language translation of the journal is available from / Interperiodica Publishing (Russia).
Geochemistry International ISSN 0016-7029.

Physicochemical Conditions of Graphitization of Hydrocarbon-bearing Rocks:
An Example from the Western Siberian Platform

A. E. Kontorovich, A. L. Pavlov, A. V. Khomenko, and G. A. Tret’yakov p. 491  abstract

Mineral Concentrators as Carriers of Major Chemical Elements in the Upper Continental Crust

N. A. Grigor’ev p. 499  abstract

REE Distribution during the Development of the Yuzhnyi Sakun Massif

V. V. Sharygin, V. A. Bobrov, I. E. Proshenkin, and I. A. Safonov p. 504  abstract

Ore Mineral Assemblages of the Maiskoe Gold Deposit

S. V. Nechaev and S. N. Bondarenko p. 516

Chemical Composition of Chrome Spinellid and the Heterogeneity
of the Daldyn Kimberlite Field

I. P. Ilupin p. 527  abstract

Low-Potassium Tholeiitic Basalts as an Indicator of the Evolution of Paleogeodynamic Environments
and Hydrocarbon Potential: Evidence from SD-6 Tyumen Superdeep Hole

A. A. Kremenetskii and V. S. Gladkikh p. 532  abstract

Upper Boundary of Hydrogen Sulfide: Implications for the Nepheloid Redox Layer
in Waters of the Caucasian Slope of the Black Sea

I. I. Volkov, E. A. Kontar, Yu. F. Lukashev, L. N. Neretin, F. Niffeler, and A. G. Rozanov p. 540  abstract

Ecotoxicant Geochemistry of Groundwater of Urban Areas

R. F. Abdrakhmanov p. 551  abstract

Radiation Properties of Crystal Defects of Quartz

L. T. Rakov p. 557  abstract

Mercury in the Air in Natural and Industrial Environments

V. Z. Fursov p. 563  abstract

Short Communications

On the Possible Origin of the Isotope Mixing Components of the Ocean Island Basalts

B. A. Blyuman p. 571  abstract

Isotopic Signatures of Lamproite Dikes on the Eastern Baltic Shield

B. V. Belyatskii, L. P. Nikitina, E. V. Savva, and L. K. Levskii p. 575  abstract

Molecular Composition of Geoporphyrins and Maturation Conditions of Organic Matter in Sediments

V. M. Serebrennikov, T. K. Mozzhelina, and O. V. Serebrennikova p. 580  abstract

Discussion

Review of a Model for the Genesis and Radial Distribution of Matter in the Protoplanetary Nebula

A. B. Makalkin and A. V. Vityazev p. 584  abstract

Radial Distribution of Matter in the Protoplanetary Nebula Revisited

A. I. Shapkin and Yu. I. Sidorov p. 588  abstract

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