The Sirius Passet Lagerstätte: silica death masking opens the window on the earliest mat ground community of the Cambrian Explosion
The Sirius Passet Lagerstätte (SP), Peary Land, North Greenland, occurs in black slates deposited at or just below storm wave base. It represents the earliest Cambrian microbial mat community with exceptional preservation, predating the Burgess Shale by 10 million years. Trilobites from the SP are p...
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ftunivutrecht:oai:dspace.library.uu.nl:1874/339380 2024-04-21T08:03:46+00:00 The Sirius Passet Lagerstätte: silica death masking opens the window on the earliest mat ground community of the Cambrian Explosion Strang, Katie M Armstrong, Howard Harper, David A. T. Trabucho-Alexandre, João Sedimentology 2016-10 application/pdf https://dspace.library.uu.nl/handle/1874/339380 en eng 0024-1164 https://dspace.library.uu.nl/handle/1874/339380 info:eu-repo/semantics/OpenAccess Article 2016 ftunivutrecht 2024-03-27T15:03:51Z The Sirius Passet Lagerstätte (SP), Peary Land, North Greenland, occurs in black slates deposited at or just below storm wave base. It represents the earliest Cambrian microbial mat community with exceptional preservation, predating the Burgess Shale by 10 million years. Trilobites from the SP are preserved as complete, three-dimensional, concave hyporelief external moulds and convex epirelief casts. External moulds are shown to consist of a thin veneer of authigenic silica. The casts are formed from silicified cyanobacterial mat material. Silicification in both cases occurred shortly after death within benthic cyanobacterial mats. Pore waters were alkali, silica-saturated, high in ferric iron but low in oxygen and sulphate. Excess silica was likely derived from remobilized biogenic silica. The remarkable siliceous death mask preservation opens a new window on the environment and location of the Cambrian Explosion. This window closed with the appearance of abundant mat grazers later as the Cambrian Explosion intensified. Article in Journal/Newspaper Greenland North Greenland Peary Land Utrecht University Repository |
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Open Polar |
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Utrecht University Repository |
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ftunivutrecht |
language |
English |
description |
The Sirius Passet Lagerstätte (SP), Peary Land, North Greenland, occurs in black slates deposited at or just below storm wave base. It represents the earliest Cambrian microbial mat community with exceptional preservation, predating the Burgess Shale by 10 million years. Trilobites from the SP are preserved as complete, three-dimensional, concave hyporelief external moulds and convex epirelief casts. External moulds are shown to consist of a thin veneer of authigenic silica. The casts are formed from silicified cyanobacterial mat material. Silicification in both cases occurred shortly after death within benthic cyanobacterial mats. Pore waters were alkali, silica-saturated, high in ferric iron but low in oxygen and sulphate. Excess silica was likely derived from remobilized biogenic silica. The remarkable siliceous death mask preservation opens a new window on the environment and location of the Cambrian Explosion. This window closed with the appearance of abundant mat grazers later as the Cambrian Explosion intensified. |
author2 |
Sedimentology |
format |
Article in Journal/Newspaper |
author |
Strang, Katie M Armstrong, Howard Harper, David A. T. Trabucho-Alexandre, João |
spellingShingle |
Strang, Katie M Armstrong, Howard Harper, David A. T. Trabucho-Alexandre, João The Sirius Passet Lagerstätte: silica death masking opens the window on the earliest mat ground community of the Cambrian Explosion |
author_facet |
Strang, Katie M Armstrong, Howard Harper, David A. T. Trabucho-Alexandre, João |
author_sort |
Strang, Katie M |
title |
The Sirius Passet Lagerstätte: silica death masking opens the window on the earliest mat ground community of the Cambrian Explosion |
title_short |
The Sirius Passet Lagerstätte: silica death masking opens the window on the earliest mat ground community of the Cambrian Explosion |
title_full |
The Sirius Passet Lagerstätte: silica death masking opens the window on the earliest mat ground community of the Cambrian Explosion |
title_fullStr |
The Sirius Passet Lagerstätte: silica death masking opens the window on the earliest mat ground community of the Cambrian Explosion |
title_full_unstemmed |
The Sirius Passet Lagerstätte: silica death masking opens the window on the earliest mat ground community of the Cambrian Explosion |
title_sort |
sirius passet lagerstätte: silica death masking opens the window on the earliest mat ground community of the cambrian explosion |
publishDate |
2016 |
url |
https://dspace.library.uu.nl/handle/1874/339380 |
genre |
Greenland North Greenland Peary Land |
genre_facet |
Greenland North Greenland Peary Land |
op_relation |
0024-1164 https://dspace.library.uu.nl/handle/1874/339380 |
op_rights |
info:eu-repo/semantics/OpenAccess |
_version_ |
1796943489356791808 |