(2019)
(2019)
(2019)
(2019)
(2019)
(2019)
(2019)
(2019)
(2019)
(2018)
(2018)
(2018)
(2018)
(2018)
(2018)
(2018)
(2018)
(2018)
(2018)
(2017)
(2017)
(2017)
(2017)
(2017)
(2017)
(2017)
(2017)
(2017)
(2017)
(2016)
(2016)
Special Issue - (2016)
(2016)
(2016)
(2016)
(2016)
(2016)
(2016)
(2016)
(2016)
(2016)
(2016)
(2016)
(2016)
(2016)
(2016)
(2016)
(2015)
(2015)
Special Issue - (2015)
(2015)
(2015)
(2015)
(2012)
(2012)
(2012)
Special Issue - (2012)
pp. 11375-11383 | Article Number: ijese.2016.824
Published Online: November 18, 2016
Abstract
This research investigated the prevailing conditions in the bottom water of the sedimentation basin and the degree of their effect on the authigenic mineralization of the Upper Triassic terrigenous deposits in the Kular-Nera slate belt (Northeastern Russia). The analysis of the distribution of rare and trace chemical elements in the studied sample showed significant variations of their composition and the presence of a number of elements in amounts that are higher than the bulk Earth values. Increased, in respect to sandstone, concentration of Li, B, Sc, V, Ni, Zr, Nb, and Mo was discovered in siltstone. A small deficit of Be, Nb, and Mo was discovered in the Late Triassic deposits on average; the concentration of these elements in individual samples exceeded the bulk Earth values by 1.5-2 times at that. Variations of the SCe/SY index (from 2.4 to 6.2) are indicative of either changes in the facies environment (coastal-marine to deep-water) or changes in the composition of the source area. The Sr/Ba0.5 ratio and the increased content of boron are typical for lagoon and highly desalted deltaic deposits. In most cases, the Mo/Mn values do not exceed 0.01; V/Crmean = 1.09, Ni/Co –7.0, while V/(V+Ni) – from 0.23 to 0.85, which is indicative of a prevailing oxygen environment with short-term decreases of the oxygen content and an increasing role of reduction processes. Due to changes in the sea level during the formation of the Late Triassic deposits, the anoxic environment changed to a moderately anoxic one.
Keywords: Northeastern Russia, Upper Triassic, gold fields, metal content, redox environment
References
Aquarelle Inc. (2010). Gold ore deposits in Russia. Edited by M.M. Konstantinov, 349.
Astakhov, A.S., Goryachev, N.A. & Mikhalitsyna, T.I. (2010). On the conditions of formation of gold-rich horizons in ore-containing black-shale masses (by the example of the Permian and recent marine deposits in the Northeastern Asia). Proceedings of the Academy of Sciences, 430(2):212-217.
Fridovsky, V.Y., Gamyanin, G.N. & Polufuntikova, L.I. (2014). Gold-quartz and antimony mineralization in the Maltan deposit in northeast Russia. Russian journal of pacific geology, 8(4):276-287.
Fridovsky, V.Y., Gamyanin, G.N. & Polufuntikova, L.I. (2015). Structures, mineralogy, and fluid regime of ore formation in the polygenetic Malo-Taryn gold field, northeast Russia. Russian journal of pacific geology, 9(4):274-286.
Goldfarb, R.J., Taylor, R., Collins, G., Goryachev, N.A. & Orlandini, O.F. (2014). Phanerozoic continental growth and gold metallogeny of Asia. Gondwana Res., 25(1):48-102.
Goryachev, N.A. & Pirajno, F. (2014). Gold deposit and gold metallogeny of Far East Russia. Ore Geology Reviews, 59: 123-151.
Grinenko, V.S. & Prokopyev, A.V. (2016). Black-shale geological generations of the Verkhoyansk terrigenous sequence and their efficient metal content. Science and Education, 1:31-40.
Hatch, J.R. & Leventhal J.S. (1992). Relationship between inferred redox potential of the depositional environment and geochemistry of the Upper Pennsylvanian (Missourian) Stark Shale Member of the Dennis Limestone, Wabaunsee County, Kansas, USA. Chern. Geol, 99:65-82.
Jones, B. & Manning, D.A.C. (1994). Composition of geochemical indicesused for the interpretation of paleoredox condi¬tions in ancient mudstones. Chem. Geol, 111:111–129.
Kholodov, V.N. (2002). The role of hydrogen sulfide basins in sedimentary rock formation. Lithology and Mineral Resources, 5:451-473.
Maslov, A.V. (2005). Sedimentary rocks: research methods and interpretation of obtained data. Study Guide., Yekaterinburg: Ural State Mining University Publishing House, 289.
Maslov, A.V., Podkovyrov, V.N., Gareyev, E.Z. & Graunov, O.V. (2016). Paleoclimate changes during the Late Precambrian (based on the study of the Upper Precambrian cross section of the Southern Ural). Lithology and Mineral Resources, 2:129-149.
Nedra Inc. (1977). Geochemistry quick-reference book. 2nd Edition, Revised and Enlarged, 184.
Polufuntikova, L.I. & Fridovsky, V.Y. (2016). Lithological features, reconstruction of redox setting, and composition of the provenances of the Upper Triassic Kular–Nera shale belt. Russian Journal of Pacific Geology, 10:218-229.
Prokopiev, А.V., Toro, J., Miller, E.L. & Gehrels G.E. (2008). The paleo-Lena River - 200 m.y. of transcontinental zircon transport in Siberia. Geology, 36(9):699-702.
Ross, R.L., Stuart, W.B. & Maslennikov, V.V. (2011). A Carbonaceous Sedimentary Source-Rock Model for Carlin-Type and Orogenic Gold Deposits. Economic Geology, 106:331–358
Schultz, R.B. (2004). Geochemical relationships of Late Paleozoic carbon-rich shales of the Midcontinent, USA: a. compendium of results advocating changeable geochemical conditions. Chemical Geology, 206:347–372.
Voroshin, S.V., Tyukova, E.E., Newberry, R.J. & Layer P.W. (2014). Orogenic gold and rare metal deposits of the Upper Kolyma District, Northeastern Russia: Relation to igneous rocks, timing, and metal assemblages. Ore Geol,62:1-24.