克拉斯诺亚尔斯克地区叶尼塞岭波罗任斯克矿床岩石和矿石的锶同位素组成

IF 0.7 4区 地球科学 Q4 GEOCHEMISTRY & GEOPHYSICS
V. N. Kuleshov, M. I. Bujakaite, N. B. Kuznetsov, L. I. Sviridov
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引用次数: 0

摘要

87Sr/86Sr(0.70825-0.70924)在Porozhinsk矿床的锰矿石和碳酸盐中被确定为Pod " emsk组。这些数据与碳(δ13C = -14.6…2.0‰,PDB)和氧(δ18О = 19.4…28.3‰,SMOW)同位素组成的变化表明所研究岩石的不同形成条件。研究的波罗任斯克矿床白云岩的87Sr/86Sr值远高于查帕河段Pod”emsk组碳酸盐岩(白云岩、灰岩)。波罗任斯克沉积白云岩87Sr/86Sr值在晚元古代海洋87Sr/86Sr变化曲线上的位置(Kuznetsov et al., 2014)表明,波罗任斯克沉积属于Pod”emsk组的碳酸盐岩比恰帕河剖面的Pod”emsk组碳酸盐岩年龄更小。在解释87Sr/86Sr变化和讨论化学地层构造的适宜性时,通常将Mn/Sr值作为碳酸盐次生蚀变程度的判据,但并不适用于形成于锰矿沉积盆地的岩石。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Strontium Isotope Composition of Rocks and Ores of the Porozhinsk Deposit (Yenisei Ridge, Krasnoyarsk Region)

Strontium Isotope Composition of Rocks and Ores of the Porozhinsk Deposit (Yenisei Ridge, Krasnoyarsk Region)

Wide variations of 87Sr/86Sr (0.70825‒0.70924) have been established at the Porozhinsk deposit in manganese ores and carbonates ascribed to the Pod’’emsk Formation. These data, together with variations in the carbon (δ13C = –14.6…2.0‰, PDB) and oxygen (δ18О = 19.4…28.3‰, SMOW) isotope composition indicate different conditions of the formation of the studied rocks. The 87Sr/86Sr values in the studied dolomites of the Porozhinsk deposit are much higher than those of carbonate rocks (dolomites, limestones) of the Pod’’emsk Formation from the Chapa River section. The position of the 87Sr/86Sr values of dolomites from the Porozhinsk deposit on the secular 87Sr/86Sr variation curve for Late Proterozoic ocean (Kuznetsov et al., 2014) suggests that the carbonate rocks attributed to the Pod’’emsk Formation at the Porozhinsk deposit have younger age than carbonates of the Pod’’emsk Formation from the Chapa River section. The Mn/Sr values usually taken as a criterion for the degree of secondary alteration of carbonates (in interpreting 87Sr/86Sr variations and discussing the suitability of the material for chemostratigraphic constructions) are not suitable for rocks formed in manganese ore sedimentation basins.

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来源期刊
Lithology and Mineral Resources
Lithology and Mineral Resources 地学-地球化学与地球物理
CiteScore
1.30
自引率
37.50%
发文量
29
审稿时长
>12 weeks
期刊介绍: Lithology and Mineral Resources is an international peer reviewed journal that publishes articles on a wide range of problems related to the formation of sedimentary rocks and ores. Special attention is given to comparison of ancient sedimentary rock and ore formation with present-day processes. The major part of the journal is devoted to comparative analysis of sedimentary processes on the continents and in oceans, as well as the genetic aspects of the formation of sedimentary and hydrothermal–sedimentary mineral resources. The journal welcomes manuscripts from all countries in the English or Russian language.
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