{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,11,3]],"date-time":"2025-11-03T04:46:41Z","timestamp":1762145201823},"reference-count":52,"publisher":"Geological Society of London","issue":"1","license":[{"start":{"date-parts":[[2016,6,22]],"date-time":"2016-06-22T00:00:00Z","timestamp":1466553600000},"content-version":"stm-asf","delay-in-days":0,"URL":"https:\/\/doi.org\/10.15223\/policy-002"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["SJG"],"published-print":{"date-parts":[[2016,8]]},"abstract":"<jats:p>\n            The Ordovician\u2013Silurian meta-sedimentary rocks of the Southern Uplands\u2013Down\u2013Longford terrane were deposited at the Laurentian margin and structurally emplaced in an accretionary prism during subduction of Iapetus Ocean lithosphere. Within the terrane, a Central Belt consists of repeated structural tracts in which Ordovician\u2013Silurian mudstone and sandstone (Moffat Shale Group) are overlain by Silurian greywacke (Gala Group). A Moffat Shale Group sandstone and Gala Group greywacke sandstones from Co. Monaghan, Ireland were sampled in order to examine, for the first time, detrital zircon spectra with a view to elucidating sediment provenance and tectonic evolution of this sector of the Laurentian margin. Detrital zircon ages from Gala Group greywacke sandstones include variable abundance of Precambrian zircons with ages typical of Laurentia, but are dominated by two Ordovician peaks at\n            <jats:italic>c.<\/jats:italic>\n            462\u2005Ma and\n            <jats:italic>c.<\/jats:italic>\n            474\u2005Ma. These Ordovician ages equate to magmatism in the local Laurentian margin in Ireland. The age spectra are distinct from those of equivalent rocks of the Southern Uplands of Scotland. There is no evidence from detrital zircon ages that a Gondwana-derived terrane had accreted to the Laurentian margin before or during sedimentation. Zircons from a Moffat Shale Group sandstone include a middle Cambrian component that may be derived from Ganderia.\n          <\/jats:p>\n          <jats:p content-type=\"supplementary-material\">\n            <jats:bold>Supplementary material:<\/jats:bold>\n            The complete U\u2013Pb data table is available at\n            <jats:uri xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" xlink:href=\"http:\/\/doi.org\/10.6084\/m9.figshare.c.3270848\">http:\/\/doi.org\/10.6084\/m9.figshare.c.3270848<\/jats:uri>\n          <\/jats:p>","DOI":"10.1144\/sjg2015-013","type":"journal-article","created":{"date-parts":[[2016,8,12]],"date-time":"2016-08-12T10:43:27Z","timestamp":1470998607000},"page":"11-17","source":"Crossref","is-referenced-by-count":11,"title":["Sediment provenance and tectonics on the Laurentian margin: implications of detrital zircons ages from the Central Belt of the Southern Uplands\u2013Down\u2013Longford Terrane in Co. Monaghan, Ireland"],"prefix":"10.1144","volume":"52","author":[{"given":"Brian","family":"McConnell","sequence":"first","affiliation":[{"name":"Geological Survey of Ireland, Beggars Bush, Dublin 4, Ireland"}]},{"given":"Russell","family":"Rogers","sequence":"additional","affiliation":[{"name":"Geological Survey of Ireland, Beggars Bush, Dublin 4, Ireland"}]},{"given":"Quentin","family":"Crowley","sequence":"additional","affiliation":[{"name":"Department of Geology, School of Natural Sciences, Trinity College, Dublin 2, Ireland"}]}],"member":"1881","published-online":{"date-parts":[[2016,6,22]]},"reference":[{"key":"e_1_3_2_2_1","doi-asserted-by":"publisher","DOI":"10.1017\/S0263593300008282"},{"key":"e_1_3_2_3_1","doi-asserted-by":"publisher","DOI":"10.1144\/gsjgs.144.5.0817"},{"key":"e_1_3_2_4_1","doi-asserted-by":"publisher","DOI":"10.1017\/S0263593300008245"},{"key":"e_1_3_2_5_1","first-page":"41","volume-title":"The Geology of Northern Ireland\u2014our Natural Foundation","author":"Anderson T.B.","year":"2004","unstructured":"Anderson, T.B. 2004. Southern Uplands\u2013Down\u2013Longford Terrane. In: Mitchell, I. (ed.) The Geology of Northern Ireland\u2014our Natural Foundation. Geological Survey of Northern Ireland, Belfast, 41\u201360."},{"key":"e_1_3_2_6_1","doi-asserted-by":"publisher","DOI":"10.1017\/S0263593300010841"},{"key":"e_1_3_2_7_1","doi-asserted-by":"publisher","DOI":"10.1144\/gsjgs.144.5.0807"},{"key":"e_1_3_2_8_1","doi-asserted-by":"publisher","DOI":"10.1144\/0016-76492009-122"},{"key":"e_1_3_2_9_1","doi-asserted-by":"publisher","DOI":"10.1016\/S0009-2541(03)00166-9"},{"key":"e_1_3_2_10_1","doi-asserted-by":"publisher","DOI":"10.1130\/0016-7606(2001)113<0443:OICFTL>2.0.CO;2"},{"key":"e_1_3_2_11_1","doi-asserted-by":"publisher","DOI":"10.1144\/0016-764902-039"},{"key":"e_1_3_2_12_1","doi-asserted-by":"publisher","DOI":"10.1144\/0016-76492006-115"},{"key":"e_1_3_2_13_1","doi-asserted-by":"publisher","DOI":"10.1016\/B978-0-444-59425-9.00020-2"},{"key":"e_1_3_2_14_1","doi-asserted-by":"publisher","DOI":"10.1144\/0016-76492007-057"},{"key":"e_1_3_2_15_1","doi-asserted-by":"publisher","DOI":"10.1144\/0016-76492010-164"},{"volume-title":"Tellus Impact","author":"Cooper M.R.","key":"e_1_3_2_16_1","unstructured":"Cooper, M.R., Floyd, J., Barker, G., Desissa Ture, M., Hodgson, J., McConnell, B. & Warke, M. in press. Ground investigation and geological significance of Tellus EM anomalies associated with the Ordovician\u2013Silurian Moffat Shale Group, Northern Ireland. In: Young, M. (ed.) Tellus Impact. Royal Irish Academy, Dublin."},{"key":"e_1_3_2_17_1","doi-asserted-by":"publisher","DOI":"10.3390\/min4020503"},{"key":"e_1_3_2_18_1","first-page":"55","volume-title":"Continental Tectonics.","author":"Dewey J.","year":"1999","unstructured":"Dewey, J. & Mange, M. 1999. Petrography of Ordovician and Silurian sediments in the western Irish Caledonides: tracers of a short-lived Ordovician continent\u2013arc collision orogeny and the evolution of the Laurentian Appalachian\u2013Caledonian margin. In: MacNiocaill, C. & Ryan, P.D. (eds) Continental Tectonics. Geological Society, London, Special Publications, 164, 55\u2013107, http:\/\/doi.org\/10.1144\/GSL.SP.1999.164.01.05"},{"key":"e_1_3_2_19_1","doi-asserted-by":"publisher","DOI":"10.1017\/S0263593300002200"},{"key":"e_1_3_2_20_1","doi-asserted-by":"publisher","DOI":"10.1017\/S0263593300008233"},{"key":"e_1_3_2_21_1","doi-asserted-by":"publisher","DOI":"10.1130\/0091-7613(1999)027<0027:SLCMAA>2.3.CO;2"},{"key":"e_1_3_2_22_1","volume-title":"Bedrock Geology 1:100,000 Scale Map Series, Sheet 8 & 9, Monaghan and Carlingford","author":"Geraghty M.","year":"1996","unstructured":"Geraghty, M. 1996. Bedrock Geology 1:100,000 Scale Map Series, Sheet 8 & 9, Monaghan and Carlingford. 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