TY - JOUR

T1 - Hydrogeochemistry of the authigenic mineral-forming processes (a case study of Oxfordian deposits in the Ob-Irtysh interfluve)

AU - Novikov, D. A.

AU - Vakulenko, L. G.

AU - Yan, P. A.

AU - Dultsev, F. F.

AU - Chernykh, A. V.

PY - 2020/9/9

Y1 - 2020/9/9

N2 - Results of the pioneering numerical physicochemical modeling of interactions in the water - rock system on the example of Oxfordian deposits in southern regions of the Ob-Irtysh interfluve (southeastern regions of Western Siberia) are presented.It has been established that, despite the groundwaters having low salinity (up to 46 g/dm3) of and their persistent interactions with rocks (during tens, or probably hundreds of millions of years), they practically have no equilibrium with primary (endogenous) minerals: albite, anortite, microcline.At the same time, groundwater is in equilibrium with micaceous minerals, Ca-, Na - and Mg-montmorillonites, kaolinite, Mg-chlorite. There is always a carbonate barrier in the way of groundwater attaining an equilibrium with primary aluminosilicate minerals. As a result of the detailed petrographic studies, the genetic series of authigenic minerals of the diagenetic and catagenetic phases were established in the studied silty-sandy rocks. Relict diagenetic minerals are represented by glauconite, pyrite, siderite, calcite of the first generation of precipitation, kaolinite, anatase and leucoxene. Catagenetic minerals are considerably dominated by calcite of the second and third generations of precipitation, quartz, kaolinite, whereas siderite, chlorite, albite, dolomite are developed in minor amounts. The results of petrographic studies have corroborated the thermodynamic calculations.

AB - Results of the pioneering numerical physicochemical modeling of interactions in the water - rock system on the example of Oxfordian deposits in southern regions of the Ob-Irtysh interfluve (southeastern regions of Western Siberia) are presented.It has been established that, despite the groundwaters having low salinity (up to 46 g/dm3) of and their persistent interactions with rocks (during tens, or probably hundreds of millions of years), they practically have no equilibrium with primary (endogenous) minerals: albite, anortite, microcline.At the same time, groundwater is in equilibrium with micaceous minerals, Ca-, Na - and Mg-montmorillonites, kaolinite, Mg-chlorite. There is always a carbonate barrier in the way of groundwater attaining an equilibrium with primary aluminosilicate minerals. As a result of the detailed petrographic studies, the genetic series of authigenic minerals of the diagenetic and catagenetic phases were established in the studied silty-sandy rocks. Relict diagenetic minerals are represented by glauconite, pyrite, siderite, calcite of the first generation of precipitation, kaolinite, anatase and leucoxene. Catagenetic minerals are considerably dominated by calcite of the second and third generations of precipitation, quartz, kaolinite, whereas siderite, chlorite, albite, dolomite are developed in minor amounts. The results of petrographic studies have corroborated the thermodynamic calculations.

KW - authigenic minerals

KW - horizon Yu1

KW - hydrogeochemistry

KW - Verkh-Tarskoe oilfield

KW - water-rock

KW - Western Siberia

UR - http://www.scopus.com/inward/record.url?scp=85091782099&partnerID=8YFLogxK

U2 - 10.1088/1742-6596/1451/1/012016

DO - 10.1088/1742-6596/1451/1/012016

M3 - Conference article

AN - SCOPUS:85091782099

VL - 1451

JO - Journal of Physics: Conference Series

JF - Journal of Physics: Conference Series

SN - 1742-6588

IS - 1

M1 - 012016

T2 - 2nd International Conference on Applied Physics, Power and Material Science, ICAPPM 2019

Y2 - 20 December 2019 through 21 December 2019

ER -