Temporal and structural evolution of the Early Palæogene rocks of the Seychelles microcontinent

Abstract The Early Palæogene Silhouette/North Island volcano-plutonic complex was emplaced during the rifting of the Seychelles microcontinent from western India. The complex is thought to have been emplaced during magnetochron C28n. However, the magnetic polarities of the rocks are almost entirely...

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Autores principales:	J. Gregory Shellnutt, Meng-Wan Yeh, Kenshi Suga, Tung-Yi Lee, Hao-Yang Lee, Te-Hsien Lin
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/e2c1eb85e984400c8d720a1902605335
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spelling	oai:doaj.org-article:e2c1eb85e984400c8d720a19026053352021-12-02T16:06:33ZTemporal and structural evolution of the Early Palæogene rocks of the Seychelles microcontinent10.1038/s41598-017-00248-y2045-2322https://doaj.org/article/e2c1eb85e984400c8d720a19026053352017-03-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-00248-yhttps://doaj.org/toc/2045-2322Abstract The Early Palæogene Silhouette/North Island volcano-plutonic complex was emplaced during the rifting of the Seychelles microcontinent from western India. The complex is thought to have been emplaced during magnetochron C28n. However, the magnetic polarities of the rocks are almost entirely reversed and inconsistent with a normal polarity. In this study we present new in situ zircon U/Pb geochronology of the different intrusive facies of the Silhouette/North Island complex in order to address the timing of emplacement and the apparent magnetic polarity dichotomy. The rocks from Silhouette yielded weighted mean 206Pb/238U ages from 62.4 ± 0.9 Ma to 63.1 ± 0.9 Ma whereas the rocks from North Island yielded slightly younger mean ages between 60.6 ± 0.7 Ma to 61.0 ± 0.8 Ma. The secular latitudinal variation from Silhouette to North Island is consistent with the anticlockwise rotation of the Seychelles microcontinent and the measured polarities. The rocks from Silhouette were emplaced across a polarity cycle (C26r-C27n-C27r) and the rocks from North Island were emplaced entirely within a magnetic reversal (C26r). Moreover, the rocks from North Island and those from the conjugate margin of India are contemporaneous and together mark the culmination of rift-related magmatism.J. Gregory ShellnuttMeng-Wan YehKenshi SugaTung-Yi LeeHao-Yang LeeTe-Hsien LinNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-7 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q J. Gregory Shellnutt Meng-Wan Yeh Kenshi Suga Tung-Yi Lee Hao-Yang Lee Te-Hsien Lin Temporal and structural evolution of the Early Palæogene rocks of the Seychelles microcontinent
description	Abstract The Early Palæogene Silhouette/North Island volcano-plutonic complex was emplaced during the rifting of the Seychelles microcontinent from western India. The complex is thought to have been emplaced during magnetochron C28n. However, the magnetic polarities of the rocks are almost entirely reversed and inconsistent with a normal polarity. In this study we present new in situ zircon U/Pb geochronology of the different intrusive facies of the Silhouette/North Island complex in order to address the timing of emplacement and the apparent magnetic polarity dichotomy. The rocks from Silhouette yielded weighted mean 206Pb/238U ages from 62.4 ± 0.9 Ma to 63.1 ± 0.9 Ma whereas the rocks from North Island yielded slightly younger mean ages between 60.6 ± 0.7 Ma to 61.0 ± 0.8 Ma. The secular latitudinal variation from Silhouette to North Island is consistent with the anticlockwise rotation of the Seychelles microcontinent and the measured polarities. The rocks from Silhouette were emplaced across a polarity cycle (C26r-C27n-C27r) and the rocks from North Island were emplaced entirely within a magnetic reversal (C26r). Moreover, the rocks from North Island and those from the conjugate margin of India are contemporaneous and together mark the culmination of rift-related magmatism.
format	article
author	J. Gregory Shellnutt Meng-Wan Yeh Kenshi Suga Tung-Yi Lee Hao-Yang Lee Te-Hsien Lin
author_facet	J. Gregory Shellnutt Meng-Wan Yeh Kenshi Suga Tung-Yi Lee Hao-Yang Lee Te-Hsien Lin
author_sort	J. Gregory Shellnutt
title	Temporal and structural evolution of the Early Palæogene rocks of the Seychelles microcontinent
title_short	Temporal and structural evolution of the Early Palæogene rocks of the Seychelles microcontinent
title_full	Temporal and structural evolution of the Early Palæogene rocks of the Seychelles microcontinent
title_fullStr	Temporal and structural evolution of the Early Palæogene rocks of the Seychelles microcontinent
title_full_unstemmed	Temporal and structural evolution of the Early Palæogene rocks of the Seychelles microcontinent
title_sort	temporal and structural evolution of the early palæogene rocks of the seychelles microcontinent
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/e2c1eb85e984400c8d720a1902605335
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Temporal and structural evolution of the Early Palæogene rocks of the Seychelles microcontinent

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