The Appin Group

Wright, A. E.

doi:10.1007/978-1-4615-7344-9_15

Cited by 11 publications

(10 citation statements)

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“…The oldest rocks are psammites and semi-pelitic schists deposited in an extensional basin, collectively called the Grampian Group (Figs 1 & 2). The overlying Appin Group is characterized by a limestone-pelite -quartzite assemblage deposited in a relatively stable shelf environment (Wright 1988). The Argyll and Southern Highland Groups, overlying the Appin Group, contain significant black slates and graphitic schists, and an increased incidence of mafic lavas and sills, grading upwards into coarse turbidite sequences (Harris et al 1978;Anderton 1985), with the Argyll Group host to locally developed stratabound exhalative mineralization (Stephenson et al 2013).…”

Section: Deposition and Tectonic Settingmentioning

confidence: 99%

How the Neoproterozoic S-isotope record illuminates the genesis of vein gold systems: an example from the Dalradian Supergroup in Scotland

Hill

Jenkin

Boyce

et al. 2013

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The genesis of quartz vein-hosted gold mineralization in the Neoproterozoic-early Palaeozoic Dalradian Supergroup of Scotland remains controversial. An extensive new dataset of S-isotope analyses from the Tyndrum area, together with correlation of the global Neoproterozoic sedimentary S-isotope dataset to the Dalradian stratigraphy, demonstrates a mixed sedimentary and magmatic sulphur source for the mineralization. d34 S values for early molybdenite-and later gold-bearing mineralization range from 22 to +12‰, but show distinct populations related to mineralization type. Modelling of the relative input of magmatic and sedimentary sulphur into gold-bearing quartz veins with d 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 viable source of sedimentary sulphur in the Dalradian Supergroup. Consequently, the immediate host rocks were not a major source of sulphur to the mineralization, consistent with their low bulk sulphur and lack of metal enrichment. Recent structural models of the Tyndrum area suggest that Easdale Subgroup metasedimentary rocks, enriched in 34 S, sulphur and metals, are repeated at depth owing to folding, and it is suggested that these are the most likely source of sedimentary sulphur, and possibly metals, for the ore fluids.Gold Open Access: This article is published under the terms of the CC-BY 3.0 license.

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Section: Deposition and Tectonic Settingmentioning

confidence: 99%

How the Neoproterozoic S-isotope record illuminates the genesis of vein gold systems: an example from the Dalradian Supergroup in Scotland

Hill

Jenkin

Boyce

et al. 2013

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“…Appin Group rocks are only exposed in this region on the Isle of Islay, within the core of the Islay Anticline (Rast and Litherland, 1970;Basahel, 1971;Wright, 1988; see also BGS 1:50 000 sheets 19, South Islay, 1998 and27, North Islay, 1994). Strata of all three subgroups are present, and show a remarkable similarity to the mainland succession, some 80 km to the north-east along strike (see Treagus et al, 2013).…”

Section: Dalradian Stratigraphymentioning

confidence: 96%

The Dalradian rocks of the south-west Grampian Highlands of Scotland

Tanner

Bendall

Pickett³

et al. 2013

Proceedings of the Geologists' Association

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The south-west Grampian Highlands, as defined here, include the Inner Hebridean islands of Islay and Jura, and extend north-east as far as Dalmally at the northern tip of Loch Awe. Due to a favourable combination of excellent coastal exposures and low tectonic strain, the late-Neoproterozoic rocks of the Dalradian Supergroup in this region are ideal for studying sedimentary structures. In addition, the diversity in protolith lithology from carbonate rocks to siliciclastic rocks of all grain sizes and volcanic rocks makes it possible to establish a very detailed lithostratigraphical succession and to recognize lateral facies changes. The stratigraphical range extends from the base of the Appin Group to the base of the Southern Highland Group and the area provides type localities for many regionally extensive formations of the Argyll Group. Rocks forming part of the basement to the Dalradian basins, the Rhinns Complex, are seen on Islay, where they are overlain by the Colonsay Group, a thick metasedimentary siliciclastic sequence of uncertain stratigraphical affinity. The structure of the Dalradian rocks in the south-west Grampian Highlands is controlled by early (D1) major folds (Islay Anticline, Loch Awe Syncline, and Ardrishaig Anticline), associated with a ubiquitous, penetrative, slaty or spaced cleavage. Most of the Dalradian rocks have been regionally metamorphosed under greenschist-facies conditions and amphibolite-facies (garnet zone) assemblages occur only in a narrow central zone, strongly affected by the D2 deformation. The area provides GCR sites of international importance for studying Neoproterozoic glacial deposits, splendidly preserved stromatolite bioherms and calcite pseudomorphs after gypsum. Deformed and undeformed sandstone dykes and interstratal dewatering structures are well displayed at several sites. Other features include thick sills of basic meta-igneous rock with unusual minerals such as stilpnomelane, and greenschist-facies rocks containing regional metamorphic kyanite. The area is of historical interest for the first recognition in Scotland, prior to 1910, of sedimentary way-up structures and pillow lavas in regionally deformed and metamorphosed rocksPeer reviewe

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“…At Birmingham, Alan Wright worked particularly on the stratigraphy and whole-rock geochemistry of the Appin Group (Wright, 1988) and 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 641 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62...…”

Section: History Of Researchmentioning

confidence: 99%

“…(Anderton, 1985;Wright, 1988). Local successions are easily established and the group has been divided into three subgroups.…”

Section: Glen Spean Subgroupmentioning

confidence: 99%

“…On Shetland, a varied succession of siliciclastic and carbonate rocks, typical of the Appin and Argyll groups, occurs in the middle of the ‗East Mainland Succession' and it is this Whiteness Group that most strongly suggests a correlation with the Dalradian of mainland Scotland. The shallow-marine environment that dominated the Glen Spean Subgroup continued up into Appin Group times, when sedimentation occurred generally on a shallow tidal shelf, overlying crust that was gently subsiding due to lithospheric stretching (Anderton, 1985;Wright, 1988). Conditions fluctuated between an open marine oxidizing environment and stagnant euxinic lagoons to produce the alternating sandstone and black pyritic mudstone sequences (Figure 1.6).…”

Section: Glen Spean Subgroupmentioning

confidence: 99%

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