Geomagnetic Secular Variations at the Permian-Triassic Boundary and Pulsed Magmatism During Eruption of the Siberian Traps
©2019. American Geophysical Union. All Rights Reserved. The tempo of Large Igneous Province emplacement is crucial to determining the environmental consequences of magmatism on the Earth. Based on detailed flow-by-flow paleomagnetic data from the most representative Permian-Triassic Siberian Traps l...
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ftneicon:oai:rour.neicon.ru:rour/197978 2023-05-15T17:24:58+02:00 Geomagnetic Secular Variations at the Permian-Triassic Boundary and Pulsed Magmatism During Eruption of the Siberian Traps Pavlov V. Fluteau F. Latyshev A. Fetisova A. Elkins-Tanton L. Black B. Burgess S. Veselovskiy R. 2019 https://openrepository.ru/article?id=197978 unknown 2 20 773 http://rour.neicon.ru:80/xmlui/bitstream/rour/197978/1/nora.pdf https://openrepository.ru/article?id=197978 SCOPUS-2019-20-2-SID85061044890 directional groups paleomagnetism Permian-Triassic boundary secular variations Siberian Traps volcanic pulses Article 2019 ftneicon 2020-07-21T12:05:48Z ©2019. American Geophysical Union. All Rights Reserved. The tempo of Large Igneous Province emplacement is crucial to determining the environmental consequences of magmatism on the Earth. Based on detailed flow-by-flow paleomagnetic data from the most representative Permian-Triassic Siberian Traps lava stratigraphy of the northern Siberian platform, we present new constraints on the rate and duration of the volcanic activity in the Norilsk and Maymecha-Kotuy regions. Our data indicate that volcanic activity there occurred during a limited number of short volcanic pulses, each consisting of multiple individual eruptions, and that the total duration of discrete eruption pulses did not exceed ~10,000 years (hiatuses are not included). Our study confirms the occurrence of a thick interval in the lower part of the Norilsk lava sections, which contains a record of geomagnetic reversal and excursion. Based on combined evidence from paleomagnetic secular variation and typical timescales for such reversals, we conclude that the ~1-km-thick lava stratigraphy, corresponding to ~20,000 km 3 of basalt, of the Kharaelakh, Norilsk, and Imangda troughs was formed during a brief, but voluminous, eruptive period of several thousand years or less. Our data further suggest that the ore-bearing Norilsk-type intrusions are coeval or nearly coeval with the boundary between the Morongovsky and Mokulaevsky formations. We calculated a new Siberian Permian-Triassic paleomagnetic pole Norilsk-Maymecha-Kotuy (NMK): PLat = 52.9°, PLong = 147.1°, A95 = 4.3°, K = 23.2, and N = 49 lava flows. It is shown that geomagnetic field variations circa 252 Ma were similar to those observed in the latest Cenozoic. Article in Journal/Newspaper norilsk NORA (National aggregator of open repositories of Russian universities) Norilsk ENVELOPE(88.203,88.203,69.354,69.354) Kotuy ENVELOPE(102.083,102.083,71.917,71.917) Maymecha ENVELOPE(99.467,99.467,71.300,71.300) Imangda ENVELOPE(89.559,89.559,69.189,69.189) |
institution |
Open Polar |
collection |
NORA (National aggregator of open repositories of Russian universities) |
op_collection_id |
ftneicon |
language |
unknown |
topic |
directional groups paleomagnetism Permian-Triassic boundary secular variations Siberian Traps volcanic pulses |
spellingShingle |
directional groups paleomagnetism Permian-Triassic boundary secular variations Siberian Traps volcanic pulses Pavlov V. Fluteau F. Latyshev A. Fetisova A. Elkins-Tanton L. Black B. Burgess S. Veselovskiy R. Geomagnetic Secular Variations at the Permian-Triassic Boundary and Pulsed Magmatism During Eruption of the Siberian Traps |
topic_facet |
directional groups paleomagnetism Permian-Triassic boundary secular variations Siberian Traps volcanic pulses |
description |
©2019. American Geophysical Union. All Rights Reserved. The tempo of Large Igneous Province emplacement is crucial to determining the environmental consequences of magmatism on the Earth. Based on detailed flow-by-flow paleomagnetic data from the most representative Permian-Triassic Siberian Traps lava stratigraphy of the northern Siberian platform, we present new constraints on the rate and duration of the volcanic activity in the Norilsk and Maymecha-Kotuy regions. Our data indicate that volcanic activity there occurred during a limited number of short volcanic pulses, each consisting of multiple individual eruptions, and that the total duration of discrete eruption pulses did not exceed ~10,000 years (hiatuses are not included). Our study confirms the occurrence of a thick interval in the lower part of the Norilsk lava sections, which contains a record of geomagnetic reversal and excursion. Based on combined evidence from paleomagnetic secular variation and typical timescales for such reversals, we conclude that the ~1-km-thick lava stratigraphy, corresponding to ~20,000 km 3 of basalt, of the Kharaelakh, Norilsk, and Imangda troughs was formed during a brief, but voluminous, eruptive period of several thousand years or less. Our data further suggest that the ore-bearing Norilsk-type intrusions are coeval or nearly coeval with the boundary between the Morongovsky and Mokulaevsky formations. We calculated a new Siberian Permian-Triassic paleomagnetic pole Norilsk-Maymecha-Kotuy (NMK): PLat = 52.9°, PLong = 147.1°, A95 = 4.3°, K = 23.2, and N = 49 lava flows. It is shown that geomagnetic field variations circa 252 Ma were similar to those observed in the latest Cenozoic. |
format |
Article in Journal/Newspaper |
author |
Pavlov V. Fluteau F. Latyshev A. Fetisova A. Elkins-Tanton L. Black B. Burgess S. Veselovskiy R. |
author_facet |
Pavlov V. Fluteau F. Latyshev A. Fetisova A. Elkins-Tanton L. Black B. Burgess S. Veselovskiy R. |
author_sort |
Pavlov V. |
title |
Geomagnetic Secular Variations at the Permian-Triassic Boundary and Pulsed Magmatism During Eruption of the Siberian Traps |
title_short |
Geomagnetic Secular Variations at the Permian-Triassic Boundary and Pulsed Magmatism During Eruption of the Siberian Traps |
title_full |
Geomagnetic Secular Variations at the Permian-Triassic Boundary and Pulsed Magmatism During Eruption of the Siberian Traps |
title_fullStr |
Geomagnetic Secular Variations at the Permian-Triassic Boundary and Pulsed Magmatism During Eruption of the Siberian Traps |
title_full_unstemmed |
Geomagnetic Secular Variations at the Permian-Triassic Boundary and Pulsed Magmatism During Eruption of the Siberian Traps |
title_sort |
geomagnetic secular variations at the permian-triassic boundary and pulsed magmatism during eruption of the siberian traps |
publishDate |
2019 |
url |
https://openrepository.ru/article?id=197978 |
long_lat |
ENVELOPE(88.203,88.203,69.354,69.354) ENVELOPE(102.083,102.083,71.917,71.917) ENVELOPE(99.467,99.467,71.300,71.300) ENVELOPE(89.559,89.559,69.189,69.189) |
geographic |
Norilsk Kotuy Maymecha Imangda |
geographic_facet |
Norilsk Kotuy Maymecha Imangda |
genre |
norilsk |
genre_facet |
norilsk |
op_source |
SCOPUS-2019-20-2-SID85061044890 |
op_relation |
2 20 773 http://rour.neicon.ru:80/xmlui/bitstream/rour/197978/1/nora.pdf https://openrepository.ru/article?id=197978 |
_version_ |
1766116270939308032 |