The Belt Basin (Rocky Mountains): Composition of Sedimentary Complexes and Some Features of Its Sedimentary Filling

IF 0.7 4区地球科学 Q4 GEOCHEMISTRY & GEOPHYSICS Lithology and Mineral Resources Pub Date : 2022-07-02 DOI:10.1134/S0024490222040058

A. V. Maslov

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Abstract

The article overviews concepts of the formation of sedimentary sequences of the Belt-Purcell Supergroup, a classical Upper Precambrian section of the Rocky Mountains (North America). Analysis of data on the bulk chemical composition of mudstones of the Belt-Purcell Supergroup (González-Álvarez, 2005; González-Álvarez and Kerrich, 2010) suggests that the overwhelming part of the fine-grained aluminosiliciclastic filling in the Belt Basin was delivered from complexes with non-Archean geochemical characteristics. During almost the entire period of sedimentary filling in the Belt Basin, the fine-grained aluminosiliciclastic material was delivered by large river arteries similar to modern rivers of category 1, i.e., major rivers draining large (>100 000 km²) continental areas (Bayon et al., 2015), and category 2 (rivers draining the “mixed/sedimentary” rocks). This fact confirms the concept of the formation of sedimentary sequences of the Belt-Purcell Supergroup inferred from both traditional geological methods and analysis of data on the U–Pb isotopic ages of detrital zircons and monazites from sandstones of various lithostratigraphic units.

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带状盆地(落基山脉):沉积复合体的组成及其沉积充填特征

本文综述了北美落基山脉上前寒武纪经典剖面Belt-Purcell超群沉积层序形成的相关概念。bel - purcell超群泥岩整体化学成分数据分析[González-Álvarez, 2005;González-Álvarez and Kerrich, 2010)表明，带盆地细粒铝硅屑充填物绝大部分来自具有非太古代地球化学特征的杂岩。在带盆地沉积充填的几乎整个时期，细粒铝硅质碎屑物质是由类似于第一类现代河流的大型河流动脉输送的，即排水大(> 100,000 km2)大陆区域的主要河流(Bayon et al.， 2015)和第二类(排水“混合/沉积”岩石的河流)。这一事实证实了传统地质方法和对不同岩性地层单元砂岩碎屑锆石和独居石的U-Pb同位素年龄分析所推断的带-珀塞尔超群沉积层序形成的概念。

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来源期刊

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

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.