Triassic Volcaniclastic and Igneous Rocks of the Pronchishchev Ridge (East Siberia, Arctic): Composition, Structure, Genesis, and Age

IF 1.2 4区地球科学 Q3 GEOSCIENCES, MULTIDISCIPLINARY

Russian Geology and Geophysics Pub Date : 2023-03-23 DOI:10.2113/rgg20224501

A. Popov, A. Shevko, E. S. Sobolev, A. V. Yadrenkin, B. Nikitenko, A. Travin

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Abstract

—Petrographic and geochemical studies of igneous and volcaniclastic rocks of the middle part of the Pronchishchev Ridge and the Terpei lowland provided new data on their composition and structure. The subdivision of the Permian–Lower Triassic strata enclosing igneous and volcaniclastic bodies has been clarified by lithological/stratigraphic methods. The Lower Triassic Ulakhan-Yuryakh, Chekanovsky, Ystanakh, and Pastakh formations have been traced for the first time in the ridge area. It is shown that the studied dolerite body and adjacent breccias in the field of middle–upper Permian rocks are part of the volcanic pipe. The tuffite sandy gritstones in the field of Lower Triassic rocks are parts of an eroded tephra ring around this diatreme. The localization of tuffite bodies in the area of the Ystanakh Formation makes it possible to date the pipe at the beginning of the late Olenekian. The obtained 40Ar/39Ar dates for the dolerites of the volcanic pipe and one of the dikes of the Pronchishchev dike belt indicate the repeated tectonomagmatic activity in the studied area in the Triassic.

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普罗奇什切夫山脊（东西伯利亚，北极）的三叠纪火山碎屑岩和火成岩：组成、结构、成因和时代

--Pronchishchev山脊中部和Terpei低地的火成岩和火山碎屑岩的岩石学和地球化学研究为其成分和结构提供了新的数据。已通过岩性/地层方法阐明了包含火成岩和火山碎屑体的二叠纪-下三叠纪地层的细分。首次在山脊地区发现了下三叠统Ulakhan Yuryakh、Chekanovsky、Ystanakh和Pastakh地层。结果表明，研究的中上二叠统岩石区的粗玄岩体和邻近的角砾岩是火山管的一部分。下三叠统岩石中的凝灰岩-砂质砂砾岩是该火山口周围被侵蚀的火山灰环的一部分。伊斯塔纳赫组区域的凝灰岩体的定位使人们有可能确定奥列涅纪晚期开始时的管道年代。获得的火山管粗玄岩和普罗奇什切夫岩脉带一个岩脉的40Ar/39Ar年龄表明，研究区在三叠纪有重复的构造岩浆活动。

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来源期刊

Russian Geology and Geophysics 地学-地球科学综合

CiteScore

2.00

自引率

18.20%

发文量

审稿时长

4-8 weeks

期刊介绍： The journal publishes original reports of theoretical and methodological nature in the fields of geology, geophysics, and geochemistry, which contain data on composition and structure of the Earth''s crust and mantle, describes processes of formation and general regularities of commercial mineral occurrences, investigations on development and application of geological-geophysical methods for their revealing. As to works of regional nature, accelerated publication are available for original papers on a variety of problems of comparative geology taking into account specific character of Siberia, adjacent Asian countries and water areas. The journal will also publish reviews, critical articles, chronicle of the most important scientific events, and advertisements.