О ВОЗРАСТЕ ФОРМИРОВАНИЯ ОСНОВАНИЯ ШПИЦБЕРГЕНА: U-Pb-Датирование ДЕТРИТНОГО ЦИРКОНА ИЗ ВЕРХНЕДОКЕМБРИЙСКИХ И НИЖНЕКАМЕННОУГОЛЬНЫХ ОБЛОМОЧНЫХ ПОРОД Северо-Западной ЧАСТИ ЗЕМЛИ НОРДЕНШЕЛЬДА, "Доклады Академии Наук"

Sirotkin, A. N.; Марин, Ю.Б.; Кузнецов, Н. Б.; Коробова, Г. А.; Романюк, Т В

doi:10.7868/s0869565217330143

Доклады Академии Наук

2017

DOI: 10.7868/s0869565217330143

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О ВОЗРАСТЕ ФОРМИРОВАНИЯ ОСНОВАНИЯ ШПИЦБЕРГЕНА: U-Pb-Датирование ДЕТРИТНОГО ЦИРКОНА ИЗ ВЕРХНЕДОКЕМБРИЙСКИХ И НИЖНЕКАМЕННОУГОЛЬНЫХ ОБЛОМОЧНЫХ ПОРОД Северо-Западной ЧАСТИ ЗЕМЛИ НОРДЕНШЕЛЬДА, "Доклады Академии Наук"

A. N. Sirotkin¹,

Ю.Б. Марин²,

Н. Б. Кузнецов³

et al.

Abstract: Изучен характер распределения возрастов детритного циркона из верхнерифейских и раннекаменноугольных песчаников северо-западной части Земли Норденшельда (о. Западный Шпицберген). Полученные результаты дополняют данные, известные ранее для пород докембрийских и палеозойских толщ запада Шпицбергена. Совместное рассмотрение этих данных показывает, что временной интервал средний рифей - ранний карбон включительно подразделяется (как минимум) на 5 этапов, во время которых питающие провинции, поставлявшие детрит в о… Show more

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Vendian age of igneous rocks of the Chamberlain valley area (Northern part of the Wedel Jarlsberg Land, Svalbard Archipelago)

Sirotkin

Евдокимов

2022

PMI

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The geological structure, structural relations with the underlying complexes, mineral composition, age and origin of sedimentary-volcanogenic and intrusive formations of the Chamberlain valley area (northern part of the Wedel Jarlsberg Land, Svalbard Archipelago) are considered. As a result of the studies, two stages of the Late Precambrian endogenous activity in this area have been identified. For the first time the Vendian ages (593-559 Ma) of intrusive (dolerites) and effusive (basalts, andesites, tuffs) rocks were determined by U-Pb-method (SHRIMP-II) for Svalbard Archipelago. At the same time, the Grenville ages for large bodies of gabbro-diorites, metadolerites bodies (1152-967 Ma), and metagranites (936 Ma) were determined for the first time for this area, which correlates well with the ages of magmatic formations obtained earlier in the southern part of Wedel Jarlsberg Land. A detailed petrographic and petrochemical characterization of all the described objects were compiled and the paleotectonic conditions of their formation were reconstructed. Based on these data, the Chemberlendalen series, which is dated to the Late Vendian, and the Rechurchbreen series, which the authors attribute to the Middle Riphean and correlate with the lower part of the Nordbucht series are distinguished. The data obtained indicate a two-stage Precambrian magmatism in this area of the Svalbard archipelago and, most importantly, provide evidence for the first time ever of endogenous activity on Svalbard in the Vendian time. This fact makes it possible to reconsider in the future the history of the formation of folded basement of the Svalbard archipelago and the nature of the geodynamic conditions in which it was formed.

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Vendian age of igneous rocks of the Chamberlain valley area (Northern part of the Wedel Jarlsberg Land, Svalbard Archipelago)

Sirotkin

Евдокимов

2022

PMI

View full text Add to dashboard Cite

show abstract

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Cited by 1 publication

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Vendian age of igneous rocks of the Chamberlain valley area (Northern part of the Wedel Jarlsberg Land, Svalbard Archipelago)

Vendian age of igneous rocks of the Chamberlain valley area (Northern part of the Wedel Jarlsberg Land, Svalbard Archipelago)

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