TY - JOUR

T1 - Isotopic and geochemical characteristics of Cambrian phosphorites of Karatau Basin (Southern Kazakhstan)

AU - Vishnevskaya, I. A.

AU - Malov, V. I.

AU - Soloshenko, N. G.

AU - Letnikova, A. F.

AU - Kiseleva, V. Yu

AU - Ivanov, A. V.

PY - 2018/1/1

Y1 - 2018/1/1

N2 - The article is devoted to studying of isotope-geochemical characteristics of phosphorite and the enclosing carbonate Karatau Phosphorus deposit. As a result of the work on the identification of the least altered rocks, the primary isotopic composition of Sr, C and O in the water of the Karatau basin was established, as well as the isotopic composition of Nd phosphorites. Kyrshabakty Formation underlying phosphorite characterized 87 Sr/ 86 Sr ratio 0.70839, δ 13 C value ranges from +0.2 to 0.6 ‰. The primary Sr isotopic composition of the phosphate-bearing Chulaktau Formation, varies from 0.70877 to 0.70905, and the carbon isotope composition ranges from -3.1 to 0.8 ‰. Based on these data, the sedimentation interval of these rocks was established. Phosphate accumulation within the Karatau basin occurred in the range of 520-509 million years ago as a result of biogenic precipitation of the phosphorus of ocean water on the shelf of the passive margin of the continent.

AB - The article is devoted to studying of isotope-geochemical characteristics of phosphorite and the enclosing carbonate Karatau Phosphorus deposit. As a result of the work on the identification of the least altered rocks, the primary isotopic composition of Sr, C and O in the water of the Karatau basin was established, as well as the isotopic composition of Nd phosphorites. Kyrshabakty Formation underlying phosphorite characterized 87 Sr/ 86 Sr ratio 0.70839, δ 13 C value ranges from +0.2 to 0.6 ‰. The primary Sr isotopic composition of the phosphate-bearing Chulaktau Formation, varies from 0.70877 to 0.70905, and the carbon isotope composition ranges from -3.1 to 0.8 ‰. Based on these data, the sedimentation interval of these rocks was established. Phosphate accumulation within the Karatau basin occurred in the range of 520-509 million years ago as a result of biogenic precipitation of the phosphorus of ocean water on the shelf of the passive margin of the continent.

KW - Chemostratigraphy

KW - Neodymium

KW - Reconstruction of sedimentary basin

KW - Strontium

KW - CHINA

KW - strontium

KW - RECORD

KW - SEAWATER

KW - GORGES

KW - reconstruction of sedimentary basin

KW - chemostratigraphy

KW - neodymium

KW - CHEMOSTRATIGRAPHY

KW - EVOLUTION

KW - AREA

KW - CARBON-ISOTOPE

KW - BOUNDARY

KW - SECTION

UR - http://www.scopus.com/inward/record.url?scp=85062190241&partnerID=8YFLogxK

U2 - 10.21638/spbu07.2018.302

DO - 10.21638/spbu07.2018.302

M3 - Article

AN - SCOPUS:85062190241

VL - 63

SP - 267

EP - 290

JO - Vestnik of Saint Petersburg University. Earth Sciences

JF - Vestnik of Saint Petersburg University. Earth Sciences

SN - 2541-9668

IS - 3

ER -