Geochemistry of Precambrian volcanosedimentary rocks of the Karsakpai Group in southern Ulutau (Central Kazakhstan)

N. V. Dmitrieva; E. F. Letnikova; I. A. Vishnevskaya; P. A. Serov

doi:10.1016/j.rgg.2017.07.004

Geochemistry of Precambrian volcanosedimentary rocks of the Karsakpai Group in southern Ulutau (Central Kazakhstan)

N. V. Dmitrieva, E. F. Letnikova, I. A. Vishnevskaya, P. A. Serov

Geological Processes Correlation Laboratory

Research output: Contribution to journal › Article › peer-review

Abstract

We have analyzed the isotope-geochemical features of volcanosedimentary rocks of the Karsakpai Group in southern Ulutau (Central Kazakhstan): mafic volcanics, siliceous and siliceous-ferruginous sediments, and quartz-sericite-chlorite schists. The close association of ferruginous quartzites with intraplate volcanics indicates that they formed in a tectonically active basin. The Nd isotope composition of ferruginous quartzites was governed by synchronous underwater volcanism, whereas the ¹⁴³Nd/¹⁴⁴Nd value of schists was additionally controlled by the Nd isotope composition of older sources. The Mesoproterozoic Nd model ages and positive ε_Nd(t) values of the metaterrigenous rocks of the Karsakpai Group indicate the presence of Mesoproterozoic juvenile material in the provenance. The minimum Nd model ages suggest the lower boundary of sedimentation of 1.3 Ga.

Original language	English
Pages (from-to)	935-948
Number of pages	14
Journal	Russian Geology and Geophysics
Volume	58
Issue number	8
DOIs	https://doi.org/10.1016/j.rgg.2017.07.004
Publication status	Published - 1 Aug 2017

Keywords

Central Kazakhstan
Late Precambrian
rift volcanics
sedimentary rocks of iron formation
Sm-Nd isotope composition
volcanosedimentary rocks
OCEANIC BASALTS
SEAWATER
YTTRIUM
PACIFIC-OCEAN
TRANSVAAL SUPERGROUP
HYDROTHERMAL FLUIDS
RARE-EARTH-ELEMENTS
ICP-MS
IRON-FORMATION
WATER

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10.1016/j.rgg.2017.07.004

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title = "Geochemistry of Precambrian volcanosedimentary rocks of the Karsakpai Group in southern Ulutau (Central Kazakhstan)",

abstract = "We have analyzed the isotope-geochemical features of volcanosedimentary rocks of the Karsakpai Group in southern Ulutau (Central Kazakhstan): mafic volcanics, siliceous and siliceous-ferruginous sediments, and quartz-sericite-chlorite schists. The close association of ferruginous quartzites with intraplate volcanics indicates that they formed in a tectonically active basin. The Nd isotope composition of ferruginous quartzites was governed by synchronous underwater volcanism, whereas the 143Nd/144Nd value of schists was additionally controlled by the Nd isotope composition of older sources. The Mesoproterozoic Nd model ages and positive εNd(t) values of the metaterrigenous rocks of the Karsakpai Group indicate the presence of Mesoproterozoic juvenile material in the provenance. The minimum Nd model ages suggest the lower boundary of sedimentation of 1.3 Ga.",

keywords = "Central Kazakhstan, Late Precambrian, rift volcanics, sedimentary rocks of iron formation, Sm-Nd isotope composition, volcanosedimentary rocks, OCEANIC BASALTS, SEAWATER, YTTRIUM, PACIFIC-OCEAN, TRANSVAAL SUPERGROUP, HYDROTHERMAL FLUIDS, RARE-EARTH-ELEMENTS, ICP-MS, IRON-FORMATION, WATER",

author = "Dmitrieva, {N. V.} and Letnikova, {E. F.} and Vishnevskaya, {I. A.} and Serov, {P. A.}",

year = "2017",

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doi = "10.1016/j.rgg.2017.07.004",

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journal = "Russian Geology and Geophysics",

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AU - Dmitrieva, N. V.

AU - Letnikova, E. F.

AU - Vishnevskaya, I. A.

AU - Serov, P. A.

PY - 2017/8/1

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AB - We have analyzed the isotope-geochemical features of volcanosedimentary rocks of the Karsakpai Group in southern Ulutau (Central Kazakhstan): mafic volcanics, siliceous and siliceous-ferruginous sediments, and quartz-sericite-chlorite schists. The close association of ferruginous quartzites with intraplate volcanics indicates that they formed in a tectonically active basin. The Nd isotope composition of ferruginous quartzites was governed by synchronous underwater volcanism, whereas the 143Nd/144Nd value of schists was additionally controlled by the Nd isotope composition of older sources. The Mesoproterozoic Nd model ages and positive εNd(t) values of the metaterrigenous rocks of the Karsakpai Group indicate the presence of Mesoproterozoic juvenile material in the provenance. The minimum Nd model ages suggest the lower boundary of sedimentation of 1.3 Ga.

KW - Central Kazakhstan

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KW - volcanosedimentary rocks

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KW - YTTRIUM

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KW - TRANSVAAL SUPERGROUP

KW - HYDROTHERMAL FLUIDS

KW - RARE-EARTH-ELEMENTS

KW - ICP-MS

KW - IRON-FORMATION

KW - WATER

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