乌拉汗-西斯海脊(萨哈共和国)的中侏罗世岩石:生物地层学、岩性特征和沉积环境

IF 0.7 4区 地球科学 Q4 GEOCHEMISTRY & GEOPHYSICS Lithology and Mineral Resources Pub Date : 2024-05-09 DOI:10.1134/S0024490224700512
V. V. Kostyleva, O. A. Lutikov, M. V. Gertseva, E. V. Vatrushkina, M. I. Tuchkova
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摘要

摘要 讨论了乌拉汗-西斯海脊内那贡扎地层东北侧中生代地段上的中侏罗世地层岩石的年龄和沉积环境。根据我们发现的溯源岩和对前人生物地层数据的分析,这些岩石的年代被认为是巴约卡期-中巴约卡期(Bajocian-Middle Bathonian)。在该剖面中确定了三个岩性不同的层序。下部单元的砂岩属于长石岩;上部单元的砂岩属于以基底外碳酸盐碎屑岩(钙钛矿)为主的岩浆岩。对岩浆岩的结构-纹理特征、矿物学-岩石学组成以及微量元素分布的分析表明,所有这些岩序都沉积在与活跃火山岛弧相关的古盆地陆架部分,据推测,该岛弧自早侏罗世起就存在于奥姆列夫卡克拉通陆地上,直到科里马-奥莫隆超地层形成结束。
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Middle Jurassic Rocks on the Ulakhan-Sis Ridge (Sakha Republic): Biostratigraphy, Lithological Features, and Depositional Environments

The age and depositional environments of Middle Jurassic terrigenous rocks crowning the Mesozoic section on the northeastern flank of the Nagondzha terrane within the Ulakhan-Sis Ridge are discussed. Based on our finds of retrocerams and the analysis of biostratigraphic data of predecessors, the Bajocian–Middle Bathonian age of these rocks is accepted. Three lithologically different sequences are identified in the section. Sandstones from the lower unit belong to feldspathic litharenites; from the upper sequences, to litharenites dominated by extrabasinal carbonate clastics (calclithites). The analysis of structural-textural features, mineralogical-petrographic composition, and distribution of trace elements in litharenites suggests that all these sequences were deposited in the shelf part of paleobasin associated with an active volcanic island arc, which presumably existed since the Early Jurassic on the Omulevka Craton terrane until the termination of the Kolyma–Omolon superterrane formation.

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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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