基于地球化学资料的古元古代卡累利阿克拉通碳酸盐岩形成条件评价

IF 0.7 4区 地球科学 Q4 GEOCHEMISTRY & GEOPHYSICS
N. I. Kondrashova, P. V. Medvedev, A. V. Lyutikov
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引用次数: 0

摘要

对位于晚太古代卡累利阿克拉通东南部和北部的两个古元古代盆地(Onega和Pana-Kuolajarvi)的碳酸盐沉积条件进行了对比分析。两个盆地的碳酸盐岩成藏始于晚雅图连世。奥涅加演替中的碳酸盐岩以白云岩为主,包括叠层石品种;在Pana-Kuolajarvi演替中,它们由白云岩和灰岩组成。在贾图里亚晚期,蓝藻在奥涅加盆地的沿海海洋环境中茁壮成长。此时,盆地的一些地区失去了与公海的联系,促进了蒸发过程的发展。Pana-Kuolajarvi盆地缺乏这种蓝藻群落的多样性和任何蒸发。地质和岩性资料表明,晚贾图连世奥涅加盆地存在浅水、泻湖、盐湖和沙卜哈环境。Pana-Kuolajarvi盆地的特点是浅水(偶尔从大陆输入的水增加)和开阔的海洋环境。通过对碳酸盐岩地球化学特征的研究,得出了相同的结论。奥涅加盆地叠层石主要形成于潮间带。偶尔,盆地与外海的联系减少,条件接近泻湖类型。在雅图连统时期,氧条件只在奥涅加盆地存在过一段有限的时间。两个沉积盆地的氧含量基本接近二氧/氧过渡边界。叠层石层中Ce异常量级的波动反映了与叠层石堆积直接接触的水体中氧含量的变化,表明盆地中存在氧“绿洲”,具有二氧和缺氧条件。仅根据地球化学标志对盆地存在氧化还原条件的结论是不充分的,而基于稀土光谱、Ce和Eu异常值以及氧化还原敏感元素对相关性支持的单个稀土元素比率等地球化学特征,对盆地碳酸盐岩沉积条件的结论与地质和岩性资料最吻合。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Assessment of the Conditions of Carbonate Rock Formation on the Karelian Craton in the Paleoproterozoic Based on Geochemical Data

Assessment of the Conditions of Carbonate Rock Formation on the Karelian Craton in the Paleoproterozoic Based on Geochemical Data

A comparative analysis of the carbonate sedimentation conditions in two Paleoproterozoic basins (Onega and Pana-Kuolajarvi), located in the southeastern and northern areas of the Late Archean Karelian Craton is presented. The carbonate accumulation began in both basins during the Late Jatulian. Carbonate rocks in the Onega succession are predominantly dolostones, including stromatolite varieties; in the Pana-Kuolajarvi succession, they comprise both dolostones and limestones. During the Late Jatulian, cyanobacteria thrived in coastal marine settings of the Onega Basin. Some areas of the basin lost connection with the open sea at this time, facilitating the development of evaporation processes. The Pana-Kuolajarvi Basin lacked such diversity of cyanobacterial communities and any evaporitization. The geological and lithological data suggest that shallow, lagoon, playa lake, and sabkha environments existed in the Onega Basin in the Late Jatulian. The Pana-Kuolajarvi Basin was characterized by shallow (with occasional increased water input from the continent) and open marine settings. The geochemical characteristics of carbonate rocks obtained in our work lead to the same facies conclusions. Stromatolites in the Onega Basin were formed mainly in the intertidal zone. Occasionally, the connection of basin with the open sea was reduced and the conditions approached the lagoonal type. The oxic conditions existed for a limited time during the Jatulian only in the Onega Basin. Basically, the oxygen content in both sedimentation basins was close to the disoxic/oxic transition boundary. Fluctuations in the Ce anomaly magnitude in stromatolite laminas reflect changes in the oxygen content in water at immediate contact with the stromatolite buildup, suggesting the existence of oxygen “oases” in the basin with disoxic and oxygen-deficient conditions. Conclusions about redox conditions existing in the basin, based only on geochemical markers, are not sufficient, whereas conclusions about the carbonate sedimentation conditions prevailing in the basin agree maximally with the geological and lithological data based on several geochemical characteristics, such as REE spectra, Ce and Eu anomaly values, and ratios of individual REEs supported by the pair correlations between redox-sensitive elements.

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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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