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Structure and Stratigraphy of the Metamorphic Rocks in Part of Northwest County Mayo, Ireland MICHAEL JOHN CROW, MICHAEL DAVID MAX & JOHN STUART SUTTON

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Structure and Stratigraphy of the Metamorphic Rocks in Part of Northwest County Mayo, Ireland MICHAEL JOHN CROW, MICHAEL DAVID MAX & JOHN STUART SUTTON Structure and stratigraphy of the metamorphic rocks in part of northwest County Mayo, Ireland MICHAEL JOHN CROW, MICHAEL DAVID MAX & JOHN STUART SUTTON CONTENTS i. Introduction ....... 579 2. Stratigraphy ....... 579 3. Structure .... 581 4. References ........ 583 SUMMARY A new geological map covering over IOOO Rocks of the Erris Complex were tectonically square km of N.w. Co. Mayo is presented. emplaced within the metasediments as major Metasediments, probably Moine and Dalradian anticlinal cores, and as transgressive thrust in age, have been deformed and metamorphosed wedges during the first Caledonian deformation. during the Caledonian orogeny together with A significant structural and metamorphic the pre-Moine Erris Complex (Laxfordian? break occurs across the Corraun Fault which is rocks). The gneissose Erris Complex is com- probably the south-westward continuation of monly preserved except where significant Cale- the Leannan Fault of County Donegal. donian reconstitution to schists has occurred. I. Introduction T nE AREA constitutes over 60 % of the metamorphic rocks in northwest County Mayo, Ireland (Fig. t). Blanket bog and drift largely obscure the rocks inland, especially in the Ballycroy area where the boundaries of the Kinrovar Schist are not well known, and along the bog over the Corraun Fault northwest of Corraun. Full outcrop maps on a six inch to one mile scale are available at the Geological Survey of Ireland. We generally agree with Kilroe (i9o7) and Trendall & ElweU (I963) but not with that part of Phillips et al. (t969) which includes this area. In the semi-petites, kyanite-staurolite-andesine/oligoclase-garnet-biotite assem- blages in the north gradually give way to albite-biotite-garnet assemblages in the south with a metamorphic break across the Corraun Fault. 2. Stratigraphy The oldest metasediments in the area occur on the west side of the Blacksod Fault (Sutton I97Ia ). The Doonaneanir Formation is a thin dolomitic semi- pelitic to pelitic schist underlying the Doonamoo Formation which is a heavy mineral banded psammite of almost gneissose appearance. The contacts of the heavy mineral banded, semi-pelitic, I OO metre thick Nakil Formation with the Jl geol. So¢. vol. x27, I97I, PP. 579--584, 3 figs. Printed in Northern Ireland. Downloaded from http://pubs.geoscienceworld.org/jgs/article-pdf/127/6/579/4884486/jgs_127_006_0579.pdf by guest on 02 October 2021 580 M. J. Crow, M. D. Max & J. S. Sutton underlying Erris Complex to the north and the overlying Duvillaun Formation on islands to the southwest of Fig. x (Max et al. 197 o) are not seen, and the strati- graphic position of the Nakil Formation is not certain. As it is the oldest observed metasediment south of the Erris Complex, it may be in part equivalent to the Doonaneanir Formation. These metasediments have all been correlated with the Morar Division of the Scottish Moinian (Johnstone et al., I969) and are about 85o metres thick. The Erris Group has been divided into five formations although other formations may be present in areas of pooi" exposure. In the northern part the oldest unit is the grey, banded, cross-bedded Belderg Quartzite. This is succeeded by the white to tan, banded and gneissose Broadhaven Psammite and the more finely banded and quartzose Ben More Quartzite. The youngest unit is the cross-laminated and more massive Srahlaghy Quartzite. The Annagh Formation is composed of tan, banded, gneissose psammites which in part strongly resemble the Broadhaven Psammite to the north. The Erris Group is correlated with the upper Moine, Loch Ell Division (Johnston et al. op. cit.; Max 197oa) and all except possibly the Annagh Formation are probably high in the Moine succession. At the maximum the Erris Group is about 5,ooo metres thick but it is so poorly exposed that fold and slide repetition could exist, which would reduce the true thickness. The Dalradian is separated into two successions. North of the Corraun Fault there are three map units, the oldest of which is the Inver Group of semi-pelitic schists with locally two limestone horizons in the lower part and banded quartzites in the upper part. From the middle upwards occasional zones of granitoid clasts occur although no prominent boulder horizons were seen except at those localities shown on the map. Thickness is difficult to estimate as both tectonic repetition and thinning must occur (Max i97o ). Above this is the Corslieve Group with a boulder bed in the lower part (c.f. Elwell I955). The IOOO metres thick Corslieve Group is largely quartzitic with massive orthoquartzites rarely containing bedded units of granitoid clast conglomerate above the boulder bed in the lower part. It is characterized by alternating quartz rich pelitic schists in the upper part. Lateral facies changes and rarity of exposure have prevented the delineation of mappable formations. The upper part of the sequence is the Corraun Group of alternating semi-pelitic and fine-grained white orthoquartzites of which only the lower 5oo metres is exposed. South of the Corraun Fault are four units. The lowest is the Knockcorraun Formation composed of pelitic schists and a limestone and above this is the 35 ° metre thick Cullydo Formation of banded psammites and orthoquartzites, which is well exposed on Corraun. The Anaffrin Formation, which is I ooo metres thick on Corraun and thickens to 2 5oo metres to the east, is mostly banded psammites with a general decrease in grain size upwards in the less schistose units. Occasional pelitic schists occur. The contact with the overlying 2oo metre thick White- heather Formation is nowhere exposed. This youngest unit is composed of gritty quartzites, banded limestones, semi-pelitic schists and actinolitic greenbeds. The northern Dalradian succession is typical of the Lower and lower Middle Dalradian (Rast I963). South of the Corraun Fault the gritty quartzites, and limestones, and greenbeds are more similar to an upper Middle or Upper Dalradian succession. It is possible that the Knockcorraun Formation is equivalent Downloaded from http://pubs.geoscienceworld.org/jgs/article-pdf/127/6/579/4884486/jgs_127_006_0579.pdf by guest on 02 October 2021 Journal of the Geological Society. Volume 127, Part 6. Crow, Max & Sutton m D4kmmd i: C [ liqirmmc~ Pt. 8roadhm L d /.ae Doonamoo Pt. ,~ [ I[:~rmr • %. ....... -..-.-.-.-.-.-.-.-.-.-.-.-.-.--. -° =111 .~, >.~b~ ) I~ % ...,~. -I ° ;;.M umlet c._.-: ~.~-[.~~ ~kr~sula -_~;: "_" _~ F1 F1 (plunge) F2 (plunge) 1=2 k ,U;~nrn F3 (plunge) F4 (~) F4 h-,U;a -I Faults +-'+++++T,++++++T+~ m4m ~- F4 Synfornl ~;.-~.- ~ boundamies ÷÷÷÷÷÷+÷÷~ mack~od Bay +++++++++~ • aeddmg (r~ht way up) ,~ Bedd~g (kn~mrt~d) T S2 n S~ ~ ~tmies, not dlffoNDm~iated ~, , , ' smmm Cm~ /:.:-:.:.:.-,, cu,,,,,o ~,,. ~~'"." --I,-~-- - l~k0,rtl~ of Conmun ======================= L~ _ * ~'-:-'-:-i :.-.. -..:.:..-:-.-..-.-,....---.:..-.v.:...-.-...-.v.:.:.-..-.-...'::.----.--.-..~.. .~:i~.:.-:-.-:_~-~.---.'- - --'~ ~-~ ~~ " + +~-..- :......--- .... .v.... -~_._- -.-.-.-...-...-.-.-........----:.:.-.-.:.... .. ....... , ;,,., con.,mn G,roup o-..:o.~__.__ ~.--'.-'" - -.-.-.- .-.-.*.........:........... .=..:_:_.:::':':-:-'--'.-'--'-'.'--'--:):-"-"-"--'.-'.-.~c~. ..... ... :. :. ..-- :-.:..--.....:- :..:. '''';~-~" s ~ .~l~ ~ _ ~;~~~ - ":-" :'.-:-.--.-.-.--; :--~': ~--~-~.- ,. con,me~ Grow)(eo.k~ b.d "~1V ,J~.,-v..-.--:-:--.-.---..---.--o.a,,:,~-. " ~ ~--.'-~-'-~.,:~,: io Iowmr pit) - The ]/ ~:,-+ ÷~.-'.'::--::--:~~:::::!:_-. ,- - , ~_ " ".¢.I F. + + ....... "**-'**.*-'.'.*.**'o*--**.'. "~ I'r,+, + +~:-:.:-:| X-'-'- (/:::-~--...-'-'-'-'-" -*-':'-'":":'-"'-.- _..:-:L!:-..,.. I-5,, , k,v,o,r ,:,--~..~.....-.-~, ~,~ -- ~ ~: +++~.::::.:. :-: En~ 4_ ~ ~ _F~ ~-~" " - _~~(~4~ ~u~ 2 ~ II=*~mameall~ Ftm. .... 1Sek~e~ (~umml~ilm F(m~ Pm-Cade~on~m and Cmiedooi~n Rocks Corramn [aT[T] Map Area p4e | ~~============================ DOoe~mNOO Fn~ Doonaneanir Fn~ Relation not certain ~kmm~ o, .2 ? ? 8 "- mnnlvar ~ Scotclm<wt Sc~lts _m- F 3-mmn Schim C~w by Sch~s Annagh Gnm~ Fxo. 1. Geological map of a part of northwest County Mayo, Ireland Downloaded from http://pubs.geoscienceworld.org/jgs/article-pdf/127/6/579/4884486/jgs_127_006_0579.pdf by guest on 02 October 2021 Structure and stratigrat~hy of metamorphic rocks, Northwest County Mayo 5 81 to part of the Inver Group and if so the Corslieve and Corraun Groups could correlate with the Cullydo and the Anaffrin Formations, but there is no evidence to confirm this. 3. Structure The area is composed of 3 structural sub-areas. West of the Blacksod Fault is the lowest structural level, east of the Blacksod Fault and north of the Corraun Fault is an intermediate structural level, and south of the Corraun Fault is an inter- mediate to higher level (Fig. I). West of the Blacksod Fault the dominant structural element is a D x dome modified by D2 antiformal doming containing the pre-Moine Erris Complex (Fig. 2a). The Annagh Gneisses (Sutton & Max I969; Max I97oa; Sutton i97I ) are marginaly reconstituted in zones designated the Carricklahan, the Tiraun, and the Scotchport Schists. These are uniform, grey semi-pelitic schists con- taining small tectonic inclusions, and relic gneissose features (Sutton I97 I b). The The Annagh Gneiss-Scotchport Schist Complex and all other pre-Moine rocks in northwest County Mayo, from the Erris Complex (Max 197 ~) which is regarded as Laxfordian in age. The Nakil, Doonaneanir, and Doonamoo Formations (Sutton i97Ia) are all upward facing on $2 which is the dominant fabric element, which generally strikes east and dips to the
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