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The Sirius Passet Lagerstatte : silica death masking opens the window on the earliest matground community of the Cambrian explosion.

Strang, K.M. and Armstrong, H.A. and Harper, D.A.T. and Trabucho-Alexandre, João P. (2016) 'The Sirius Passet Lagerstatte : silica death masking opens the window on the earliest matground community of the Cambrian explosion.', Lethaia., 49 (4). pp. 631-643.

Abstract

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.

Item Type:Article
Full text:(VoR) Version of Record
Available under License - Creative Commons Attribution.
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Full text:(VoR) Version of Record
Available under License - Creative Commons Attribution.
Download PDF (Final published version)
(5045Kb)
Status:Peer-reviewed
Publisher Web site:http://dx.doi.org/10.1111/let.12174
Publisher statement:© 2016 The Authors Lethaia published by John Wiley & Sons Ltd on behalf of Lethaia Foundation. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
Date accepted:11 December 2015
Date deposited:31 May 2016
Date of first online publication:19 April 2016
Date first made open access:No date available

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