Palaeoenvironmental significance of lacustrine stromatolite forms from the Middle Old Red Sandstone of the Orcadian Basin

S. D. Andrews, N. H. Trewin

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

The form of microbialite accumulations is largely the product of environmental processes and microbial activity. Recent work has largely concentrated on the identification and classification of microbialites with little attention being paid to their environmental significance. This study describes the environmental distribution of the varied stromatolite forms recorded from the Middle Old Red Sandstone sequences of the Orcadian Basin. Comparisons are made with Triassic examples from East Greenland and modern microbialite accumulations.
The Middle Old Red Sandstone of northern Scotland was deposited in a predominantly lacustrine setting. Stromatolites are recorded from both steep basin margin coincident settings, and lower gradient settings where the lake margin was distant from the basin margin. In the latter case stromatolite development is largely restricted to transgressive lacustrine sequences during the deposition of which, reduced rates of sedimentation resulted from the migration of sediment input points towards the basin margin. Stromatolite sheets, domal mounds, aligned mounds (and associated runnels), sand-cored stromatolite mounds and reefal stromatolite accumulations have been identified representing the transition from more sheltered to more exposed environments. In basin margin coincident settings stromatolite accumulation is restricted to areas of low sedimentation where microbialites coat boulders and pebbles.
A model for the palaeoenvironmetal distribution of the stromatolite forms described is proposed and is shown to be applicable to similar examples from the Triassic of East Greenland. It is suggested that this model may be more widely applicable to stromatolitic accumulations in similar lacustrine settings through large portions of the Phanerozoic.
Original languageEnglish
Pages (from-to)414-429
Number of pages16
JournalGeological Magazine
Volume151
Issue number3
Early online date19 Jul 2013
DOIs
Publication statusPublished - May 2014

Fingerprint

Old Red Sandstone
stromatolite
basin
microbialite
Triassic
sedimentation
pebble
Phanerozoic
microbial activity
sand
lake
sediment

Keywords

  • microbialites
  • lacustrine
  • Middle Old Red Sandstone
  • Orcadian Basin
  • Northern Scotland

Cite this

Palaeoenvironmental significance of lacustrine stromatolite forms from the Middle Old Red Sandstone of the Orcadian Basin. / Andrews, S. D.; Trewin, N. H.

In: Geological Magazine, Vol. 151, No. 3, 05.2014, p. 414-429.

Research output: Contribution to journalArticle

@article{82bab2c03ee0412082bdd39add810869,
title = "Palaeoenvironmental significance of lacustrine stromatolite forms from the Middle Old Red Sandstone of the Orcadian Basin",
abstract = "The form of microbialite accumulations is largely the product of environmental processes and microbial activity. Recent work has largely concentrated on the identification and classification of microbialites with little attention being paid to their environmental significance. This study describes the environmental distribution of the varied stromatolite forms recorded from the Middle Old Red Sandstone sequences of the Orcadian Basin. Comparisons are made with Triassic examples from East Greenland and modern microbialite accumulations. The Middle Old Red Sandstone of northern Scotland was deposited in a predominantly lacustrine setting. Stromatolites are recorded from both steep basin margin coincident settings, and lower gradient settings where the lake margin was distant from the basin margin. In the latter case stromatolite development is largely restricted to transgressive lacustrine sequences during the deposition of which, reduced rates of sedimentation resulted from the migration of sediment input points towards the basin margin. Stromatolite sheets, domal mounds, aligned mounds (and associated runnels), sand-cored stromatolite mounds and reefal stromatolite accumulations have been identified representing the transition from more sheltered to more exposed environments. In basin margin coincident settings stromatolite accumulation is restricted to areas of low sedimentation where microbialites coat boulders and pebbles.A model for the palaeoenvironmetal distribution of the stromatolite forms described is proposed and is shown to be applicable to similar examples from the Triassic of East Greenland. It is suggested that this model may be more widely applicable to stromatolitic accumulations in similar lacustrine settings through large portions of the Phanerozoic.",
keywords = "microbialites, lacustrine, Middle Old Red Sandstone, Orcadian Basin, Northern Scotland",
author = "Andrews, {S. D.} and Trewin, {N. H.}",
note = "Fieldwork undertaken by SDA was supported by the Inverness Field Club and the Carnegie Trust. Triassic and modern microbialites described from East Greenland were examined while undertaking fieldwork with CASP. NHT visited Shark Bay many years ago under the expert guidance of Brian Logan. We thank Robert Riding and Susan Marriott for constructive and helpful reviews of the original manuscript.",
year = "2014",
month = "5",
doi = "10.1017/S0016756813000290",
language = "English",
volume = "151",
pages = "414--429",
journal = "Geological Magazine",
issn = "0016-7568",
publisher = "Cambridge University Press",
number = "3",

}

TY - JOUR

T1 - Palaeoenvironmental significance of lacustrine stromatolite forms from the Middle Old Red Sandstone of the Orcadian Basin

AU - Andrews, S. D.

AU - Trewin, N. H.

N1 - Fieldwork undertaken by SDA was supported by the Inverness Field Club and the Carnegie Trust. Triassic and modern microbialites described from East Greenland were examined while undertaking fieldwork with CASP. NHT visited Shark Bay many years ago under the expert guidance of Brian Logan. We thank Robert Riding and Susan Marriott for constructive and helpful reviews of the original manuscript.

PY - 2014/5

Y1 - 2014/5

N2 - The form of microbialite accumulations is largely the product of environmental processes and microbial activity. Recent work has largely concentrated on the identification and classification of microbialites with little attention being paid to their environmental significance. This study describes the environmental distribution of the varied stromatolite forms recorded from the Middle Old Red Sandstone sequences of the Orcadian Basin. Comparisons are made with Triassic examples from East Greenland and modern microbialite accumulations. The Middle Old Red Sandstone of northern Scotland was deposited in a predominantly lacustrine setting. Stromatolites are recorded from both steep basin margin coincident settings, and lower gradient settings where the lake margin was distant from the basin margin. In the latter case stromatolite development is largely restricted to transgressive lacustrine sequences during the deposition of which, reduced rates of sedimentation resulted from the migration of sediment input points towards the basin margin. Stromatolite sheets, domal mounds, aligned mounds (and associated runnels), sand-cored stromatolite mounds and reefal stromatolite accumulations have been identified representing the transition from more sheltered to more exposed environments. In basin margin coincident settings stromatolite accumulation is restricted to areas of low sedimentation where microbialites coat boulders and pebbles.A model for the palaeoenvironmetal distribution of the stromatolite forms described is proposed and is shown to be applicable to similar examples from the Triassic of East Greenland. It is suggested that this model may be more widely applicable to stromatolitic accumulations in similar lacustrine settings through large portions of the Phanerozoic.

AB - The form of microbialite accumulations is largely the product of environmental processes and microbial activity. Recent work has largely concentrated on the identification and classification of microbialites with little attention being paid to their environmental significance. This study describes the environmental distribution of the varied stromatolite forms recorded from the Middle Old Red Sandstone sequences of the Orcadian Basin. Comparisons are made with Triassic examples from East Greenland and modern microbialite accumulations. The Middle Old Red Sandstone of northern Scotland was deposited in a predominantly lacustrine setting. Stromatolites are recorded from both steep basin margin coincident settings, and lower gradient settings where the lake margin was distant from the basin margin. In the latter case stromatolite development is largely restricted to transgressive lacustrine sequences during the deposition of which, reduced rates of sedimentation resulted from the migration of sediment input points towards the basin margin. Stromatolite sheets, domal mounds, aligned mounds (and associated runnels), sand-cored stromatolite mounds and reefal stromatolite accumulations have been identified representing the transition from more sheltered to more exposed environments. In basin margin coincident settings stromatolite accumulation is restricted to areas of low sedimentation where microbialites coat boulders and pebbles.A model for the palaeoenvironmetal distribution of the stromatolite forms described is proposed and is shown to be applicable to similar examples from the Triassic of East Greenland. It is suggested that this model may be more widely applicable to stromatolitic accumulations in similar lacustrine settings through large portions of the Phanerozoic.

KW - microbialites

KW - lacustrine

KW - Middle Old Red Sandstone

KW - Orcadian Basin

KW - Northern Scotland

U2 - 10.1017/S0016756813000290

DO - 10.1017/S0016756813000290

M3 - Article

VL - 151

SP - 414

EP - 429

JO - Geological Magazine

JF - Geological Magazine

SN - 0016-7568

IS - 3

ER -