Primary data on the impact from trap magmatism on the hydrogeochemistry of brines in the southwestern part of the Kureyka syncline (Siberian Platform)

Dmitry A Novikov,Fedor F Dultsev,O Shouakar-Stash,Anatoliy V Chernykh,R Millot,O Chudaev,Y Kharaka,Lyudmila M Zhitova,R Harmon

doi:10.1051/e3sconf/20199808017

Dmitry A Novikov, Fedor F Dultsev + Show 7 more

Open Access

https://doi.org/10.1051/e3sconf/20199808017

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Abstract

The new data on the trap magmatism affecting the hydrogeochemistry of brines in southwestern Kureyka syncline in the west of the ancient Siberian platform are presented. The brines occurring in Paleozoic and Proterozoic deposits have salinity (total dissolved solids) varying broadly: from 30.2 to 469.6 g/dm3 for Na Cl, Na-Ca Cl, Ca-Na Cl, Ca-Mg Cl and Ca Cl types, among which the mixed types (Ca-Na Cl and Na-Ca Cl) are found prevailing. The activity of intrusive trap magmatism in the contact zone (with a strike length of up to 400 m) facilitated the disintegration of organic compounds in the free and water-dissolved form (CH4, C2H6, C3H8, iC4H10, nC4H10, iC5H12, nC5H12, C6H14, I, B, NH4). The reaction of the intruding traps brines interaction significantly affected the initial composition of brines, showing a shift towards their saturation with iron, aluminum, silica and other components and thus bearing the evidence of possible salt-induced metal extraction from magmatic melts into an ore-bearing fluid.

Highlights

The evolution of the hydrogeological structure of the southwestern parts of the Kureyka syncline is largely controlled by the unique saturation of the geological section with intrusive bodies (Fig. 1)
The studied brines belong to Na Cl, Na-Ca-Cl, Ca-Cl Na-Ca-Cl and Ca Ng Cl types
In addition to the negative impact on the preservation of hydrocarbons in the contact zone, the intrusive magmatism of traps has largely contributed to the process of hydrocarbons maturation in areas distanced from the contact

Summary

Introduction

The evolution of the hydrogeological structure of the southwestern parts of the Kureyka syncline (west of the Siberian platform) is largely controlled by the unique saturation (up to 50%) of the geological section with intrusive bodies (Fig. 1). Brines with the total dissolved soilds (TDS) value varying from 30.2 (suprasalt formation) to 469.6 g/dm3 (salt formation) are found to be widespread in Paleozoic and Proterozoic deposits of the study area.

Results

Conclusion