Latest Permian-Triassic magmatism of the Taimyr Peninsula: New evidence for a connection to the Siberian Traps large igneous province

Mikhail Kurapov, Victoria Ershova, Andrei Khudoley, Marina Luchitskaya, Daniel Stockli, Alexander Makariev, Elena Makarieva, Irina Vishnevskaya

Результат исследования: Научные публикации в периодических изданияхстатьярецензирование

Аннотация

This study presents new whole rock major and trace element, Sr-Nd isotopic, petrographic, and geochronologic data for seven latest Permian (Changhsingian)-Late Triassic (Carnian) granitoid intrusions of the northwestern and northeastern Taimyr Peninsula in the Russian High Arctic. U-Pb zircon ages, obtained using secondary ion mass spectrometry (SIMS), sensitive high-resolution ion microprobe (SHRIMP), and laser ablation-in-ductively coupled plasma-mass spectrometry (LA-ICP-MS), define the crystallization age of the Taimyr intrusions studied as ranging from ca. 253 Ma to 228 Ma, which suggests two magmatic pulses of latest Permian-Early Triassic and Middle-Late Triassic age. Ar-Ar dating of biotite and amphibole indicate rapid cooling of the intrusions studied, but Ar-Ar ages of several samples were reset by secondary heating and hydrothermal activity induced by the Middle-Late Triassic magmatic pulse. Petrographic data distinguish two groups of granites: syenite-monzonites and gran-ites-granodiorites. Sr-Nd isotopic data, obtained from the same intrusions, show a variation of initial (87Sr/86Sr)i ratios between 0.70377 and 0.70607, and eNd(t) values range between -6.9 and 1.2. We propose that the geochemical and isotopic

Язык оригиналаанглийский
Страницы (с-по)2062-2077
Число страниц16
ЖурналGeosphere
Том17
Номер выпуска6
DOI
СостояниеОпубликовано - 2021

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  • 1.05.KY ГЕОЛОГИЯ

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