TY - JOUR

T1 - Latest Permian-Triassic magmatism of the Taimyr Peninsula: New evidence for a connection to the Siberian Traps large igneous province

AU - Kurapov, Mikhail

AU - Ershova, Victoria

AU - Khudoley, Andrei

AU - Luchitskaya, Marina

AU - Stockli, Daniel

AU - Makariev, Alexander

AU - Makarieva, Elena

AU - Vishnevskaya, Irina

N1 - Funding Information: This work was supported by Russian Foundation for Basic Research Grant 19-35-90006 and by Changes at the Top of the World through Volcanism and Plate Tectonics: A Norwegian-Russian-North American collaboration in Arctic research and education (NOR-R-AM2) no. 309477. Interpretation of isotopic data was supported by Russian Science Foundation grant no. 20-17-00169. Part of the fieldwork and geochronological dating was performed in the framework of compiling the State Geological Map of the Russian Federation on a scale of 1: 1,000,000. We are grateful to J. Barnet for discussion and assistance with English. We thank Andrea Hampel, Victoria Pease, and Genna Chiaro for their constructive comments that helped to improve the manuscript. Funding Information: education (NOR-R-AM2) no. 309477. Interpretation of isotopic data was supported by Russian Science Foundation grant no. 20–17–00169. Part of the fieldwork and geochronological dating was performed in the framework of compiling the State Geological Map of the Russian Federation on a scale of 1: 1,000,000. We are grateful to J. Barnet for discussion and assistance with English. We thank Andrea Hampel, Victoria Pease, and Genna Chiaro for their constructive comments that helped to improve the manuscript. Funding Information: This work was supported by Russian Foundation for Basic Research Grant 19–35–90006 and by Changes at the Top of the World through Volcanism and Plate Tectonics: A Norwegian-Russian-North American collaboration in Arctic research and Publisher Copyright: © 2021. All Rights Reserved.

PY - 2021

Y1 - 2021

N2 - 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

AB - 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

UR - http://www.scopus.com/inward/record.url?scp=85122231254&partnerID=8YFLogxK

U2 - 10.1130/GES02421.1

DO - 10.1130/GES02421.1

M3 - Article

AN - SCOPUS:85122231254

VL - 17

SP - 2062

EP - 2077

JO - Geosphere

JF - Geosphere

SN - 1553-040X

IS - 6

ER -