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Easdale Subgroup

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Series: Geological Society, London, Special Publications
Published: 01 January 2015
DOI: 10.1144/SP393.9
EISBN: 9781862396692
.... Modelling of the relative input of magmatic and sedimentary sulphur into gold-bearing quartz veins with δ 34 S values of +12‰ indicates a maximum of 68% magmatic sulphur, and that S-rich, SEDEX-bearing, Easdale Subgroup metasedimentary rocks lying stratigraphically above the host rocks represent the only...
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Journal Article
Published: 01 March 2014
Journal of the Geological Society (2014) 171 (2): 145-148.
.... Dalradian sandstones are mineralogically mature (i.e. quartz-rich; Arnaud 2004 ), and so were potentially good reservoirs. Many Dalradian shales are carbonaceous, but an exceptionally carbonaceous unit, the Easdale Slate and equivalents, of the Easdale Subgroup, Argyll Group ( Fig. 1 ), can be traced...
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Journal Article
Published: 01 March 2004
Journal of the Geological Society (2004) 161 (2): 229-242.
... . 0.7082–0.7095) limestones, consistent with a rise in seawater 87 Sr/ 86 Sr around 600 Ma. 87 Sr/ 86 Sr data are consistent with the sedimentary affinity of the Islay Subgroup with the underlying Appin Group, and with a possible time interval between deposition of Islay and Easdale Subgroup rocks...
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Journal Article
Published: 01 August 1988
Journal of the Geological Society (1988) 145 (4): 669-678.
... steep belt. In the Islay-Jura area an anomalously thick Islay Subgroup succession accumulated in a half-graben bounded by a listric normal fault to the NW and terminated by transfer faults at each end. The deposition of a thick Easdale Subgroup section was controlled by movements on what is now...
Series: Geological Society, London, Memoirs
Published: 01 January 2011
DOI: 10.1144/M36.63
EISBN: 9781862394117
... of the Argyll Group (see Arnaud & Fairchild 2011 ). It ranges from several tens to many hundreds of metres in thickness and occurs in numerous localities in Scotland and the north of Ireland. A second glacial is recorded in the middle part of the Argyll Group (Easdale Subgroup) and consists of localised...
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Journal Article
Published: 01 September 2009
Journal of the Geological Society (2009) 166 (5): 845-857.
... anomaly; (2) the presence of the pre-Marinoan Trezona anomaly and 635 Ma Marinoan-equivalent cap carbonate sequence in rocks of the middle Easdale Subgroup; (3) the terminal Proterozoic ( c . 600–551 Ma) Wonoka–Shuram anomaly in the Girlsta Limestone on Shetland. These linkages strengthen previously...
FIGURES
Journal Article
Published: 01 July 2004
Journal of the Geological Society (2004) 161 (4): 629-640.
... a coherent tectonostratigraphy. We present evidence for such an unconformity preserved at the base of the Easdale Subgroup in NW Ireland. Reworked clasts that contain a pre-existing tectonometamophic history are identified within a conglomerate that lies along this regionally recognized boundary...
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Journal Article
Published: 01 April 2002
Mineralogical Magazine (2002) 66 (2): 337-352.
...C. G. Smith; E. R. Phillips Abstract The first recorded occurrence of cummingtonite in the Scottish Dalradian is described. The mineral occurs in thin layers within a psammite-semipelite sequence forming the lower part of the Easdale Subgroup in which it coexists with bytownitic plagioclase...
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Journal Article
Published: 01 July 1977
Journal of the Geological Society (1977) 133 (5): 413-432.
... to Easdale subgroups of the Middle Dalradian and can be correlated with the metamorphic rocks of the Nephin Beg succession in NW Co. Mayo. The Ox Mountains succession represents the deepest structural level seen and consists of basic volcanic rock, graphite schist, marble quartzite, psammite, and semi-pelite...
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Map of NW Ireland showing the distribution of Dalradian <b>subgroups</b> after res...
Published: 01 July 2004
Fig. 4.  Map of NW Ireland showing the distribution of Dalradian subgroups after restoration of Caledonian strike-slip faulting and removal of Devonian granites (modified from Hutton & Alsop 1996 ). The map highlights the location of the unconformity at the base of the Easdale Subgroup
Journal Article
Published: 01 July 2015
Journal of the Geological Society (2015) 172 (4): 459-464.
... surface temperatures during a prolonged glacial period penetrated deep into the bedrock and influenced conditions in the metamorphic realm. The Dalradian metasedimentary rocks on the island of Kerrera in western Scotland are believed to be members of the Easdale subgroup within the Argyll Group...
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Summary stratigraphy for upper part of the Dalradian Supergroup, including ...
Published: 01 March 2014
Fig. 1. Summary stratigraphy for upper part of the Dalradian Supergroup, including Easdale Subgroup of the Argyll Group with interpreted depositional environments and showing petroleum system (modified from Anderton 1985 ; Tanner et al . 2013 ). Horizon of Marinoan glaciation as proposed
Image
Carbon-isotopic trends of the main marble units in Shetland and proposed co...
Published: 01 January 2009
of the Whiteness Limestone (i.e. basal cap carbonate and overlying limestone rhythmites) is shown in an enlarged plot to the right. With respect to Dalradian rocks in mainland Scotland and Ireland, the Whiteness Limestone is correlative with the Cranford Limestone near the base of the Easdale Subgroup in Donegal
Journal Article
Published: 01 January 2005
Journal of the Geological Society (2005) 162 (1): 221-224.
... a consistent SE-younging. The base of the Easdale Subgroup is next seen on the east side of the Garbh Aird peninsula [NM 8772 3724], where the Jura Quartzite is conformable with the Selma Black Slate, the local equivalent of the Jura Slate member. The Quartzite is highly fractured in outcrop, but bedding...
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Whole-rock geochemical plots comparing cummingtonite-bearing rocks with Cri...
Published: 01 April 2002
F ig . 5. Whole-rock geochemical plots comparing cummingtonite-bearing rocks with Crinan Subgroup basic metavolcanic and semipelitic rocks from the Killin-Tyndrum area (BGS, unpublished data), Southern Highland Group volcaniclastic sandstones ( Pickett, 1997 ) and mean compositions of Easdale
Journal Article
Published: 01 September 2011
Journal of the Geological Society (2011) 168 (5): 1133-1146.
... (J. Mendum, pers. comm.), lying within the Kymah Quartzite Formation ( BGS 1996 , Fig. 3 ). The Easdale Subgroup represents a change to finer grained sedimentation and more varied lithofacies. The lower part of the succession comprises rapidly deposited deep-water sediments; the upper part...
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Series: Geological Society, London, Special Reports
Published: 01 January 2011
DOI: 10.1144/SR25.11
EISBN: 9781862396937
... of evidence, they consider that the boundary between the Islay and the Easdale subgroups is marked by an unconformity. They also proposed that the earlier parts of the Dalradian, below the base-Easdale Subgroup unconformity, underwent deformation during the Precambrian. However, Tanner et al . (2005...
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Series: Geological Society, London, Special Reports
Published: 01 January 1994
DOI: 10.1144/SR22.4
EISBN: 9781786202857
... Highland Border Complex. It should be noted that whereas Column I2a relates the N Carrowgarve Formation to the Easdale Subgroup, Winchester & Long (pers. comm. 1992) interpret the South Carrowgarve Schist and the Ooghnadarve Melange as post-Dalradian. Kennedy (pers. comm. 1992) assigned these units...
Journal Article
Published: 01 March 2001
Geological Magazine (2001) 138 (2): 193-211.
... Schist Formation (Easdale Subgroup) in the hangingwall, from inverted Blair Atholl Subgroup (Malin Schist Formation, Glencolumbkille Dolomite Formation) and Islay Subgroup (Port Askaig Tillite Formation, Slieve Tooey Quartzite Formation) in the footwall to the slide (Figs 3 , 4 ). Both...
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Series: Geological Society, London, Special Publications
Published: 01 January 2015
DOI: 10.1144/SP393.7
EISBN: 9781862396692
... for the Neoproterozoic ( McCay et al. 2006 ; Lowry et al. 2008 ; Prave et al. 2009 a , b ). Another complicating factor is the apparent presence of a major unconformity at the base of the Easdale Subgroup in NW Ireland such that the Dalradian Supergroup may comprise two distinct tectono-stratigraphic...
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