The Rhinns Complex: Proterozoic basement on Islay and Colonsay, Inner Hebrides, Scotland, and on Inishtrahull, NW Ireland

Muir, R. J.; Fitches, W. R.; Maltman, Alex

doi:10.1017/s0263593300006313

Cited by 22 publications

(4 citation statements)

References 55 publications

(54 reference statements)

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“…Exposed bedrock, known to be Palaeoproterozoic granitic gneiss, is also present in the NE of the area and forms part of the Inishtrahull Island rock complex ( Fig. 10) (Muir et al 1994).…”

Section: Case Study 2: Characterizing Underwater Channels On the Celtmentioning

confidence: 99%

Mapping Ireland's coastal, shelf and deep-water environments using illustrative case studies to highlight the impact of seabed mapping on the generation of blue knowledge

O’Toole

Judge

Sacchetti

et al. 2020

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Through Ireland's national seabed mapping programme, Integrated Mapping for the Sustainable Development of Ireland's Marine Resource (INFOMAR), the collaboration between Geological Survey Ireland and the Marine Institute continues to comprehensively map Ireland's marine territory in high resolution. Through its work, the programme builds on earlier Irish seabed mapping efforts, including the Irish National Seabed Survey project in producing seabed mapping products that support Ireland's blue economy, European marine policy and international efforts to understand our global oceans. INFOMAR uses a variety of marine technologies to deliver accurate bathymetric maps and useful data products to end users through a free and open source licensing agreement. To reflect the diversity of applications these data products serve, a series of four case studies are presented here focusing on marine geophysical and geological data from locations within Ireland's marine territories. The case studies illustrate how data generated through seabed mapping may be interpreted to directly impact the generation of blue knowledge across a variety of marine environments ranging from shallow coastal and shelf waters to the deep oceanic depths of the continental slope of Ireland's marine area. The impact of Ireland's seabed mapping efforts is further considered in the context of national, European and international initiatives where Ireland's marine knowledge resource is leveraged to deliver positive benefit to the programme's stakeholders.

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“…Exposed bedrock, known to be Palaeoproterozoic granitic gneiss, is also present in the NE of the area and forms part of the Inishtrahull Island rock complex ( Fig. 10) (Muir et al 1994).…”

Section: Case Study 2: Characterizing Underwater Channels On the Celtmentioning

confidence: 99%

Mapping Ireland's coastal, shelf and deep-water environments using illustrative case studies to highlight the impact of seabed mapping on the generation of blue knowledge

O’Toole

Judge

Sacchetti

et al. 2020

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“…1988; Loewy et al . 2003; Muir, Fitches & Maltman, 1994; Daly, Muir & Cliff, 1991; Dickin & Bowes, 1991) that was metamorphosed shortly after its formation (Roddick & Max, 1975). The Annagh Gneiss Complex, exposed in a small inlier in W Ireland, differs from the Rhinns Complex in that its Palaeoproterozoic component is slightly younger and it contains extensive Mesoproterozoic intrusions ( c .…”

Section: Crystalline Basement In Irelandmentioning

confidence: 99%

Hidden Archaean and Palaeoproterozoic crust in NW Ireland? Evidence from zircon Hf isotopic data from granitoid intrusions

et al. 2009

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-The presence of major crystalline basement provinces at depth in NW Ireland is inferred from in situ Hf isotope analysis of zircons from granitoid rocks that cut structurally overlying metasedimentary rocks. Granitoids in two of these units, the Slishwood Division and the Tyrone Central Inlier, contain complex zircons with core and rim structures. In both cases, cores have average εHf values that differ from the average εHf values of the rims at 470 Ma (the time of granitoid intrusion). The Hf data and similarity in U-Pb age between the inherited cores and detrital zircons from the host metasedimentary rocks suggests local contamination during intrusion rather than transport of the grains from the source region at depth. Rims from the Slishwood Division intrusions have average εHf 470 values of −7.7, consistent with a derivation from juvenile Palaeoproterozoic crust, such as the Annagh Gneiss Complex or Rhinns Complex of NW Ireland, implying that the deep crust underlying the Slishwood Division is made of similar material. Rims from the Tyrone Central Inlier have extremely negative εHf 470 values of approximately −39. This isotopic signature requires an Archaean source, suggesting rocks similar to the Lewisian Complex of Scotland, or sediment derived wholly from it, occurs at depth in NW Ireland.

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“…Possible sources of c. 455 Ma Slishwood Division pegmatite material include the Palaeoproterozoic Annagh Gneiss Complex (Daly, 1996), Dalradian metasediments (Argyll and Southern Highland Group), Rhinns Complex (Muir, Fitches & Maltman, 1994) and Slishwood Division (Fig. 1).…”

Section: D Pegmatite Intrusion and The Ox Mountains Granodioritementioning

confidence: 99%

Isotopic dating of overthrusting, collapse and related granitoid intrusion in the Grampian orogenic belt, northwestern Ireland

et al. 2000

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In the Grampian (Ordovician) orogenic belt in northwestern Ireland the Dalradian Supergroup abuts and interleaves with an enigmatic psammite-dominant unit, with relict latest Precambrian granulite-facies assemblages, known as the Slishwood Division. These two units were most likely tectonically juxtaposed during the D 3 phase of Dalradian deformation. Using Ar-Ar, Rb-Sr and Sm-Nd methods, 53 new mineral ages have been obtained from both rock units, and from pegmatites intruding them, in an attempt to constrain the timing of their juxtaposition and the history they subsequently shared. Prior to D 3 (c. 480 Ma), retrograde hornblende poikiloblasts grew in granulite-facies metabasite pods within the Slishwood Division. Tectonic juxtaposition (D 3 ) with the Dalradian is loosely constrained between 479 Ma and 459 Ma but is likely to have occurred between 470 Ma and 459 Ma. Dalradian peak metamorphic conditions were attained shortly after D 3 , at around 460 Ma. Extensional collapse of the orogen, with rapid uplift and exhumation, is dated by an abundance of mineral cooling ages between 460 Ma and 450 Ma. Orogenic collapse is also dated, more precisely, by widespread pegmatite intrusion into both rock units at about 455 Ma. Initial 87 Sr/ 86 Sr ratios suggest that these pegmatites are partial melts from Dalradian metasediments. A second suite of pegmatites were intruded, along with the Ox Mountains Granodiorite, much later at or around 400 Ma during sinistral shearing. ‡Author for correspondence: michael.flowerdew@ucd.ie

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The Rhinns Complex: Proterozoic basement on Islay and Colonsay, Inner Hebrides, Scotland, and on Inishtrahull, NW Ireland

Cited by 22 publications

References 55 publications

Mapping Ireland's coastal, shelf and deep-water environments using illustrative case studies to highlight the impact of seabed mapping on the generation of blue knowledge

Mapping Ireland's coastal, shelf and deep-water environments using illustrative case studies to highlight the impact of seabed mapping on the generation of blue knowledge

Hidden Archaean and Palaeoproterozoic crust in NW Ireland? Evidence from zircon Hf isotopic data from granitoid intrusions

Isotopic dating of overthrusting, collapse and related granitoid intrusion in the Grampian orogenic belt, northwestern Ireland

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