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Stac Fada Member

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Journal Article

The Mesoproterozoic Stac Fada Member, NW Scotland: an impact origin confirmed but refined

G. R. Osinski, L. Ferrière, P. J. A. Hill, A. R. Prave, L. J. Preston, A. Singleton, A. E. Pickersgill
Published: 16 October 2020
Journal of the Geological Society (2021) 178 (1): jgs2020-056.
DOI: https://doi.org/10.1144/jgs2020-056
...G. R. Osinski; L. Ferrière; P. J. A. Hill; A. R. Prave; L. J. Preston; A. Singleton; A. E. Pickersgill Abstract The origin of the Stac Fada Member has been debated for decades with several early hypotheses being proposed, but all invoking some connection to volcanic activity. In 2008, the discovery...
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On the track of a Scottish impact structure: a detrital zircon and apatite provenance study of the Stac Fada Member and wider Stoer Group, NW Scotland

Gavin G. Kenny, Gary J. O’Sullivan, Stephen Alexander, Michael J. Simms, David M. Chew, Balz S. Kamber
Published: 24 November 2019
Geological Magazine (2019) 156 (11): 1863–1876.
DOI: https://doi.org/10.1017/S0016756819000220
...Gavin G. Kenny; Gary J. O’Sullivan; Stephen Alexander; Michael J. Simms; David M. Chew; Balz S. Kamber Abstract The Stac Fada Member of the Stoer Group, within the Torridonian succession of NW Scotland, is a melt-rich, impact-related deposit that has not been conclusively correlated with any known...
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Field photographs of the <span class="search-highlight">Stac</span> <span class="search-highlight">Fada</span> <span class="search-highlight">Member</span>. ( a ) Bay of Stoer locality. ( b...

Field photographs of the Stac Fada Member. ( a ) Bay of Stoer locality. ( b...

Published: 16 October 2020
Fig. 2. Field photographs of the Stac Fada Member. ( a ) Bay of Stoer locality. ( b ) Same image as ( a ) with the Stac Fada Member highlighted in a red overlay. ‘SF2' and ‘SF4' correspond to the units of Young (2002) (see text for further details); ‘c' are two large sandstone clasts. ( c
Journal Article

A reassessment of the proposed ‘Lairg Impact Structure’ and its potential implications for the deep structure of northern Scotland

Michael J. Simms, Kord Ernstson
Published: 10 June 2019
Journal of the Geological Society (2019) 176 (5): 817–829.
DOI: https://doi.org/10.1144/jgs2017-161
...Michael J. Simms; Kord Ernstson Abstract The Lairg Gravity Low may represent a buried impact crater c . 40 km across that was the source of the 1.2 Ga Stac Fada Member ejecta deposit but the gravity anomaly is too large to represent a simple crater and there is no evidence of a central peak...
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(A) ϵ 53 Cr isotope profile for <span class="search-highlight">Stac</span> <span class="search-highlight">Fada</span> <span class="search-highlight">Member</span> (SFM) (location 7). Anomal...

(A) ϵ 53 Cr isotope profile for Stac Fada Member (SFM) (location 7). Anomal...

Published: 01 April 2008
Figure 4. (A) ϵ 53 Cr isotope profile for Stac Fada Member (SFM) (location 7). Anomalous excess of 53 Cr in Stac Fada Member clearly indicates a meteoritic component in this unit. (B) Iridium profile (location 6). Over an order of magnitude increase in Ir relative to basement gneiss is present
Image
Photomicrographs and sketch showing petrographic nature of <span class="search-highlight">Stac</span> <span class="search-highlight">Fada</span> <span class="search-highlight">Member</span>...

Photomicrographs and sketch showing petrographic nature of Stac Fada Member...

Published: 01 March 2011
Fig. 3. Photomicrographs and sketch showing petrographic nature of Stac Fada Member. ( a ) Degassing structures lined with authigenic K-feldspar and filled by diagenetic calcite. Within the matrix of the Stac Fada Member are melted clasts of material. ( b ) Sketch showing cross-section through
Image
Scanned polished thin sections of the <span class="search-highlight">Stac</span> <span class="search-highlight">Fada</span> <span class="search-highlight">Member</span> melt-bearing breccia...

Scanned polished thin sections of the Stac Fada Member melt-bearing breccia...

Published: 16 October 2020
Fig. 3. Scanned polished thin sections of the Stac Fada Member melt-bearing breccias. All scale bars are 0.5 cm and all samples are from the Bay of Stoer locality.
Image
Plane-polarized light photomicrographs of the <span class="search-highlight">Stac</span> <span class="search-highlight">Fada</span> <span class="search-highlight">Member</span> melt-bearing...

Plane-polarized light photomicrographs of the Stac Fada Member melt-bearing...

Published: 16 October 2020
Fig. 4. Plane-polarized light photomicrographs of the Stac Fada Member melt-bearing breccias. ( a ) Shard-like, devitrified and altered melt fragment from Bay of Stoer. Note the presence of quartz mineral clasts. ( b ) Devitrified and altered melt fragment from Bay of Stoer. Note the elongated
Image
( a ) Overview of the <span class="search-highlight">Stac</span> <span class="search-highlight">Fada</span> <span class="search-highlight">Member</span> at Stoer. White boxes refer to locat...

( a ) Overview of the Stac Fada Member at Stoer. White boxes refer to locat...

Published: 10 June 2019
Fig. 2. ( a ) Overview of the Stac Fada Member at Stoer. White boxes refer to locations of more detailed photographs in ( c )–( e ). The sandstone rafts are encased in suevite. The tabular bedding of the Stoer Group sandstones is in sharp contrast to the massive impactite. ( b ) Closer view
Image
( a ) Basal breccia of <span class="search-highlight">Stac</span> <span class="search-highlight">Fada</span> <span class="search-highlight">Member</span> at Enard Bay, randomly oriented ang...

( a ) Basal breccia of Stac Fada Member at Enard Bay, randomly oriented ang...

Published: 10 June 2019
Fig. 3. ( a ) Basal breccia of Stac Fada Member at Enard Bay, randomly oriented angular and rounded gneiss blocks up to 0.5 m across resting on Stoer Group sandstone and surrounded by a fine-grained matrix. The hammer is 38 cm in length. ( b ) Interlocking ‘pillow’ in the upper part of the basal
Image
( a ) Overview of the <span class="search-highlight">Stac</span> <span class="search-highlight">Fada</span> <span class="search-highlight">Member</span> at Stattic Point. The impactite is a...

( a ) Overview of the Stac Fada Member at Stattic Point. The impactite is a...

Published: 10 June 2019
Fig. 4. ( a ) Overview of the Stac Fada Member at Stattic Point. The impactite is about 8 m thick at this location. The area in the white box is the upper surface shown in ( c ). ( b ) Large pale green ‘bomb’ or melt clast at Stattic Point measuring 17 cm across the long axis and now devitrified
Image
Map showing regional geology and the location of the <span class="search-highlight">Stac</span> <span class="search-highlight">Fada</span> <span class="search-highlight">Member</span> and t...

Map showing regional geology and the location of the Stac Fada Member and t...

Published: 01 October 2015
Figure 1. Map showing regional geology and the location of the Stac Fada Member and the analyzed sample (14-SF-01) at UK Grid Reference NC 03348 28515 (lat 58.2014N, long 5.3482W; modified after Young, 2002 ).
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Major element composition of Stoer Group rocks: <span class="search-highlight">Stac</span> <span class="search-highlight">Fada</span> <span class="search-highlight">Member</span> SF3, SF4 (...

Major element composition of Stoer Group rocks: Stac Fada Member SF3, SF4 (...

Published: 01 May 2010
Fig. 3 Major element composition of Stoer Group rocks: Stac Fada Member SF3, SF4 ( Young 2002 ) and TN/RB/004 (this work), compared with the mean value of Lower Palaeozoic metabentonites (MB mean), and three Neoproterozoic tuffs (GHRB112, SKRB05, TNRB26) ( Batchelor et al . 2008 ).
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TN&#x2F;RB&#x2F;004 (this work), <span class="search-highlight">Stac</span> <span class="search-highlight">Fada</span> <span class="search-highlight">Member</span> SF3, SF4 ( Young 2002 ) and host St...

TN/RB/004 (this work), Stac Fada Member SF3, SF4 ( Young 2002 ) and host St...

Published: 01 May 2010
Fig. 5 TN/RB/004 (this work), Stac Fada Member SF3, SF4 ( Young 2002 ) and host Stoer (Torr) mudstone ( Young 1999 ), Scourian gneiss ( Tarney & Weaver 1987 ) and three Neoproterozoic tuffs, all normalized to MORB (data from Saunders & Tarney 1984 ; Sun 1980 ). Th value not available
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Component directions of magnetization observed in the <span class="search-highlight">Stac</span> <span class="search-highlight">Fada</span> <span class="search-highlight">member</span> in o...

Component directions of magnetization observed in the Stac Fada member in o...

Published: 01 January 2004
Figure 15. Component directions of magnetization observed in the Stac Fada member in outcrops at the Stoer Peninsula and Enard Bay after tilt adjustment. The squares refer to the components of low blocking temperature (Lbt) and the circles to components of high blocking temperature (see text
Journal Article

Precambrian reidite discovered in shocked zircon from the Stac Fada impactite, Scotland

S.M. Reddy, T.E. Johnson, S. Fischer, W.D.A. Rickard, R.J.M. Taylor
Journal: Geology
Published: 01 October 2015
Geology (2015) 43 (10): 899–902.
DOI: https://doi.org/10.1130/G37066.1
...Figure 1. Map showing regional geology and the location of the Stac Fada Member and the analyzed sample (14-SF-01) at UK Grid Reference NC 03348 28515 (lat 58.2014N, long 5.3482W; modified after Young, 2002 ). ...
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The Mesoproterozoic Stac Fada proximal ejecta blanket, NW Scotland: constraints on crater location from field observations, anisotropy of magnetic susceptibility, petrography and geochemistry

Kenneth Amor, Stephen P. Hesselbo, Don Porcelli, Adam Price, Naomi Saunders, Martin Sykes, Jennifer Stevanović, Conal MacNiocaill
Published: 10 June 2019
Journal of the Geological Society (2019) 176 (5): 830–846.
DOI: https://doi.org/10.1144/jgs2018-093
...Fig. 2. ( a ) Overview of the Stac Fada Member at Stoer. White boxes refer to locations of more detailed photographs in ( c )–( e ). The sandstone rafts are encased in suevite. The tabular bedding of the Stoer Group sandstones is in sharp contrast to the massive impactite. ( b ) Closer view...
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A Precambrian proximal ejecta blanket from Scotland

Kenneth Amor, Stephen P. Hesselbo, Don Porcelli, Scott Thackrey, John Parnell
Journal: Geology
Published: 01 April 2008
Geology (2008) 36 (4): 303–306.
DOI: https://doi.org/10.1130/G24454A.1
...Figure 4. (A) ϵ 53 Cr isotope profile for Stac Fada Member (SFM) (location 7). Anomalous excess of 53 Cr in Stac Fada Member clearly indicates a meteoritic component in this unit. (B) Iridium profile (location 6). Over an order of magnitude increase in Ir relative to basement gneiss is present...
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The age of the Mesoproterozoic Stoer Group sedimentary and impact deposits, NW Scotland

John Parnell, Darren Mark, Anthony E. Fallick, Adrian Boyce, Scott Thackrey
Published: 01 March 2011
Journal of the Geological Society (2011) 168 (2): 349–358.
DOI: https://doi.org/10.1144/0016-76492010-099
...Fig. 3. Photomicrographs and sketch showing petrographic nature of Stac Fada Member. ( a ) Degassing structures lined with authigenic K-feldspar and filled by diagenetic calcite. Within the matrix of the Stac Fada Member are melted clasts of material. ( b ) Sketch showing cross-section through...
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Journal Article

Crystal tuff in the Stoer Group, Torridonian Supergroup, NW Scotland

Richard A. Batchelor, Anthony R. Prave
Published: 01 May 2010
Scottish Journal of Geology (2010) 46 (1): 1–6.
DOI: https://doi.org/10.1144/0036-9276/01-377
...Fig. 3 Major element composition of Stoer Group rocks: Stac Fada Member SF3, SF4 ( Young 2002 ) and TN/RB/004 (this work), compared with the mean value of Lower Palaeozoic metabentonites (MB mean), and three Neoproterozoic tuffs (GHRB112, SKRB05, TNRB26) ( Batchelor et al . 2008 ). ...
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