Geochemistry and nature of the protoliths of Triassic manganese-silicate rocks and silicate-magnetite ores of the Sikhote-Alin

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Abstract

The article is devoted to the issues of the origin of jaspers and contact-metamorphosed sediments – manganese silicate (composed mainly of Mn-silicates) rocks and silicate-magnetite ores composing stratum and lenticular bodies in the Triassic chert formation of the Sikhote-Alin. Chemostratigraphy methods were used to prove the chemogenic-biogenic nature of the initial deposits – protoliths of these formations. The article presents a large volume of geochemical (143Nd/144Nd, REE) data for manganese silicate rocks, silicate-magnetite ores and jaspers of the Taukha and Samarka terranes. The present-day paired values of Sm/Nd and 143Nd/144Nd for seawater of the Triassic-Jurassic period, obtained from the study of siliceous and manganese silicate rocks, as well as silicate-magnetite ores and presented as an isochron in the diagram Sm/Nd–143Nd/144Nd, can be used to solve other important geological problems of the Sikhote-Alin.

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Elena V. Perevoznikova

Far East Geological Institute, FEB RAS

Author for correspondence.
Email: elenavalper@yandex.ru
ORCID iD: 0000-0003-4805-3833

Candidate of Sciences in Geology and Mineralogy, Senior Researcher

Russian Federation, Vladivostok

Valentin T. Kazachenko

Far East Geological Institute, FEB RAS

Email: vkazachenko@mail.ru
ORCID iD: 0000-0002-5331-499X

Doctor of Sciences in Geology and Mineralogy, Chief Researcher

Russian Federation, Vladivostok

References

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Supplementary files

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2. Fig. 1. The position of the studied objects in Sikhote-Alin (tectonic basis according to A.I. Khanchuk [13] with minor modifications). 1 – massifs: Khankaisky (KH), Bureya (BR); 2 – Jurassic terranes (fragments of accretionary prisms): SM – Samarka, NB – Nadanhada-Bikinsky; 3 – Kalinovka gabbroids (Devonian?); 4 – Okrainsko-Sergeevsky terrane (SR) and its fragments, included in the structures of the Jurassic accretionary prism and having experienced, together with them, a cycle of syn- and post-accretionary transformations; 5–8 – Early Cretaceous terranes-fragments: 5 – Neocomian accretionary prism (TU – Taukha), 6 – near-continental Early Cretaceous spreading turbidite basin (ZhR – Zhuravlevka-Amur), 7 – Barremian-Albian island-arc system (KM – Kemsky), 8 – Albian accretionary prism (KS – Kiselevsko-Manoma); 9 – left-wing strike-slip faults, including: KK – Kukansky, AR – Arsenyevsky, MFA – Mishan-Fushunsky (Alchansky), CSA – Central Sikhote-Alinsky, FR – Furmanovsky; 10 – thrust faults; 11 – studied areas with outcrops of Triassic contact-metamorphosed metalliferous sediments: 1 – Shirokopadninskaya area, 2 – Mokrushinskaya area, 3 – Vysokogorskaya area, 4 – Sadovaya area, 5 – Gornaya area

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3. Fig. 2. REE spectra of jaspers (a), manganese-silicate rocks (b) and silicate-magnetite ores (c) of the Shirokopadninskaya area (Taukha terrane) and manganese-silicate rocks of the Gornaya area (Samarka terrane) (d)

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4. Fig. 3. Position of Triassic jasper points of the Shirokopadninskaya area on the Fe2O3–Nd (a) and Fe2O3–Zn (b) diagrams

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5. Fig. 4. Position of Triassic jaspers, Jurassic cherts and metamorphosed metalliferous sediments of Sikhote-Alin on Sm/Nd–Sm/Eu and Sm/Nd–Al2O3 diagrams. a – silicate-magnetite ores (1) and jaspers (2) of the Shirokopadninskaya area of the Taukha terrane, manganese-silicate rocks of the Gornaya area of the Samarka terrane (3); b, c – siliceous rocks: Triassic of the Gorbushinsky (4) and Jurassic of the Erdagouz (5) complexes (the initial data are taken from [22]); a, b – dotted line – trend with Sm/Nd ~ 0.21; number I is its number Fig. 5. Position of points of the studied rocks on the 143Nd /144Nd – Sm/Nd diagram. 1 – chondrites; 2–4 – Taukha Terrane: silicate-magnetite ores (2) and manganese-silicate rocks (3), Samarka Terrane: manganese-silicate rocks (4). In circles: mantle source – depleted (DM) and primitive (PM) mantle. The solid line in the figure shows the trend of metamorphosed Triassic metalliferous sediments, the dotted lines (for comparison) – isochrones of PM derivatives calculated for 66.4 million years (Cretaceous–Paleogene boundary), 235 million years (Anisian–Ladinian boundary) and 374 million years (Middle–Late Devonian boundary).

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6. Fig. 5. Polozheniye tochek izuchennykh porod na diagramme 143Nd /144Nd – Sm/Nd. 1 – khondrity; 2–4 – Taukhinskiy terreyn: silikatno-magnetitovyye rudy (2) i margantsevo-silikatnyye porody (3), Samarkinskiy terreyn: margantsevo-silikatnyye porody (4). V kruzhkakh: mantiynyy istochnik – depletirovannaya (DM) i primitivnaya (PM) mantii. Sploshnoy liniyey na risunke pokazan trend metamorfizovannykh triasovykh metallonosnykh osadkov, punktirnymi (dlya sravneniya) – izokhrony proizvodnykh RM, rasschitannyye dlya 66,4 mln (granitsa mela i paleogena), 235 mln (granitsa aniziya i ladina) i 374 mln let (granitsa srednego i pozdnego devona) Ещё 604 / 5 000 Fig. 5. The position of the studied rocks on the 143Nd/144Nd – Sm/Nd diagram. 1 – chondrites; 2–4 – Taukha terrane: silicate-magnetite ores (2) and manganese-silicate rocks (3), Samarka terrane: manganese-silicate rocks (4). In the circles: mantle source – depleted (DM) and primitive (PM) mantle. The solid line in the figure shows the trend of metamorphosed Triassic metalliferous sediments, the dotted lines (for comparison) – isochrones of PM derivatives calculated for 66.4 million years (Cretaceous–Paleogene boundary), 235 million years (Anisian–Ladine boundary) and 374 million years (Middle–Late Devonian boundary).

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