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

Published online by Cambridge University Press:  07 September 2009

M. J. FLOWERDEW ,
D. M. CHEW ,
J. S. DALY  and
I. L. MILLAR
M. J. FLOWERDEW*
Affiliation:
British Antarctic Survey, High Cross, Madingley Road, Cambridge, CB3 0ET, UK
D. M. CHEW
Affiliation:
Department of Geology, Trinity College Dublin, Dublin 2, Ireland
J. S. DALY
Affiliation:
UCD School of Geological Sciences, University College Dublin, Belfield, Dublin 4, Ireland
I. L. MILLAR
Affiliation:
NERC isotope Geosciences Laboratory, Kingsley Dunham Centre, Keyworth, Nottingham, NG12 5GG, UK
*
†Author for correspondence: [email protected]
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Abstract

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 ϵHf470 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 ϵHf470 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.

Keywords

zirconHf isotopegranitepetrogenesisCaledonides
Type
Original Article
Information
Geological Magazine , Volume 146 , Issue 6 , November 2009 , pp. 903 - 916
Copyright
Copyright © Cambridge University Press 2009

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References

Amelin, Y. 2005. Meteorite phosphates show constant Lu-176 decay rate since 4557 million years ago. Science 310, 839–41.CrossRefGoogle Scholar
Banks, C. J., Smith, M., Winchester, J. A., Horstwood, M. S. A., Noble, S. R. & Ottley, C. J. 2007. Provenance of intra-Rodinian basin-fills: The lower Dalradian Supergroup, Scotland. Precambrian Research 153, 46–64.CrossRefGoogle Scholar
Blichert-Toft, J. 2008. The Hf isotopic composition of zircon reference material 91500. Chemical Geology 253, 252–7.CrossRefGoogle Scholar
Blichert-Toft, J. & Albarède, F. 1997. The Lu–Hf isotope geochemistry of chrondrites and the evolution of the mantle–crust system. Earth and Planetary Science Letters 148, 243–58.CrossRefGoogle Scholar
Cawood, P. A., Nemchin, A. A., Smith, M. & Loewy, S. 2003. Source of the Dalradian Supergroup constrained by U–Pb dating of detrital zircon and implications for the East Laurentia margin. Journal of the Geological Society, London 160, 231–46.CrossRefGoogle Scholar
Chen, R.-X., Zheng, Y.-F., Zhao, Z.-F., Tang, J., Wu, F.-Y. & Liu, X. M. 2007. Zircon U–Pb age and Hf isotope evidence for contrasting origin of bimodal protoliths for ultrahigh-pressure metamorphic rocks from the Chinese Continental Scientific Drilling project. Journal of Metamorphic Geology 25, 873–94.CrossRefGoogle Scholar
Chew, D. M., Flowerdew, M. J., Page, L. M., Crowley, Q. G., Daly, J. S., Cooper, M. & Whitehouse, M. J. 2008. The tectonothermal evolution and provenance of the Tyrone Central Inlier, Ireland: Grampian imbrication of an outboard Laurentian microcontinent? Journal of the Geological Society, London 165, 675–85.CrossRefGoogle Scholar
Chew, D. M., Graham, J. R. & Whitehouse, M. J. 2007. U–Pb zircon geochronology of plagiogranites from the Lough Nafooey (= Midland Valley) arc in western Ireland: constraints on the onset of the Grampian orogeny. Journal of the Geological Society, London 164, 747–50.CrossRefGoogle Scholar
Chew, D. M. & Schaltegger, U. 2005. Constraining sinistral shearing in NW Ireland: a precise U–Pb zircon crystallisation age for the Ox Mountains Granodiorite. Irish Journal of Earth Sciences 23, 55–63.Google Scholar
Clemens, J. D. 2003. S-type granitic magmas – petrogenetic issues, models and evidence. Earth Science Reviews 61, 1–18.CrossRefGoogle Scholar
Cooper, M. R., Crowley, Q. G. & Rushton, A. W. A. 2008. New age constraints for the Ordovician Tyrone Volcanic Group, Northern Ireland. Journal of the Geological Society, London 165, 333–9.CrossRefGoogle Scholar
Daly, J. S. 2009. Precambrian. In The Geology of Ireland, 2nd edition (eds Holland, C. H. & Sanders, I. S.), pp. 7–42. Edinburgh: Dunedin Academic Press.Google Scholar
Daly, J. S. 1996. Pre-Caledonian history of the Annagh Gneiss Complex, northwestern Ireland, and correlation with Laurentia–Baltica. Irish Journal of Earth Sciences 15, 5–18.Google Scholar
Daly, J. S. & Flowerdew, M. J. 2005. Grampian and late-Grenville events recorded by mineral geochronology near a basement-cover contact in N. Mayo, Ireland. Journal of the Geological Society, London 162, 163–74.CrossRefGoogle Scholar
Daly, J. S. & Menuge, J. F. 1989. Nd-isotopic evidence for the provenance of the Dalradian Supergroup sediments in Ireland. Terra Abstracts 1, 12.Google Scholar
Daly, J. S., Muir, R. J. & Cliff, R. A. 1991. A precise U–Pb zircon age for the Inishtrahull syenitic gneiss, County Donegal, Ireland. Journal of the Geological Society, London 148, 639–42.CrossRefGoogle Scholar
Dempsey, C. S., Halliday, A. N. & Meighan, I. G. 1990. Combined Sm–Nd and Rb–Sr isotope systematics in the Donegal granitoids and their petrogenetic implications. Geological Magazine 127, 75–80.CrossRefGoogle Scholar
Dickin, A. P. & Bowes, D. R. 1991. Isotopic evidence for the extent of early Proterozoic basement in Scotland and northwest Ireland. Geological Magazine 128, 385–8.CrossRefGoogle Scholar
Draut, A. E., Clift, P. D., Chew, D. M., Cooper, M. J., Taylor, R. N. & Hannigan, R. E. 2004. Laurentian crustal recycling in the Ordovician Grampian Orogeny: Nd isotopic evidence from western Ireland. Geological Magazine 141, 195–207.CrossRefGoogle Scholar
Flowerdew, M. J. & Daly, J. S. 2005. Sm–Nd mineral ages and P–T constraints on the pre-Grampian high grade metamorphism of the Slishwood Division, north-west Ireland. Irish Journal of Earth Sciences 23, 107–23.Google Scholar
Flowerdew, M. J., Daly, J. S., Guise, P. G. & Page, L. M. 2000. The Slishwood Division and its role in the Grampian Orogeny–Indenter tectonics in the Caledonides of Ireland. Irish Journal of Earth Sciences 18, 132–3.Google Scholar
Flowerdew, M. J., Daly, J. S. & Whitehouse, M. J. 2005. 470 Ma granitoid magmatism associated with the Grampian Orogeny in the Slishwood Division, NW Ireland. Journal of the Geological Society, London 162, 563–75.CrossRefGoogle Scholar
Flowerdew, M. J., Millar, I. L., Vaughan, A. P. M., Horstwood, M. S. A. & Fanning, C. M. 2006. The source of granitic gneisses and migmatites in the Antarctic Peninsula: a combined U–Pb SHRIMP and laser ablation Hf isotope study of complex zircons. Contributions to Mineralogy and Petrology 151, 751–68.CrossRefGoogle Scholar
Griffin, W. L., Belousova, E. A., Shee, S. R., Pearson, N. J. & O'Reilly, S. Y. 2004. Archean crustal evolution in the northern Yilgarn Craton: U–Pb and Hf-isotope evidence from detrital zircons. Precambrian Research 131, 231–82.CrossRefGoogle Scholar
Griffin, W. L., Pearson, N. J., Belousova, E. A. & Saeed, A. 2006. Comment: Hf-isotope heterogeneity in zircon 91500. Chemical Geology 233, 358–63.CrossRefGoogle Scholar
Halliday, A. N., Dickin, A. P., Hunter, R. N., Davies, G. R., Dempster, T. J., Hamilton, P. J. & Upton, B. G. J. 1993. Formation and composition of the lower continental crust: evidence from Scottish xenolith suites. Journal of Geophysical Research 98B, 581–607.CrossRefGoogle Scholar
Hamilton, P. J., Evensen, N. M., O'Nions, R. K. & Tarney, J. 1979. Sm–Nd systematics of Lewisian gneisses – implications for origin of granulites. Nature 277, 25–8.CrossRefGoogle Scholar
Hartley, J. J. 1933. The geology of north-eastern Tyrone and the adjacent portions of County Londonderry. Proceedings of the Royal Irish Academy 41B, 218–85.Google Scholar
Hibbard, J., Tracy, R. & Henika, W. 2003. The Smith River allochthon: a southern Appalachian peri-Gondwana terrane emplaced directly on Laurentia? Geology 31, 215–18.2.0.CO;2>CrossRefGoogle Scholar
Hoskin, P. W. O., Kinny, P. D., Wyborn, D. & Chappel, B. W. 2000. Identifying accessory mineral saturation during differentiation in granitoid magmas: an integrated approach. Journal of Petrology 41, 1365–96.CrossRefGoogle Scholar
Kinny, P. D., Friend, C. R. L. & Love, G. J. 2005. Proposal for a terrane-based nomenclature for the Lewisian Gneiss Complex of NW Scotland. Journal of the Geological Society, London 162, 175–86.CrossRefGoogle Scholar
Landes, M., Ritter, J. R. R., Readman, P. W. & O'Reilly, B. M. 2005. A review of the Irish crustal structure and signatures from the Caledonian and Variscan Orogenies. Terra Nova 17, 111–20.CrossRefGoogle Scholar
Loewy, S. L., Connelly, J. N., Dalziel, I. W. D. & Gower, C. F. 2003. Eastern Laurentia in Rodinia: constraints from whole-rock Pb and U/Pb geochronology. Tectonophysics 375, 169–97.CrossRefGoogle Scholar
Long, C. B. & McConnell, B. J. 1999. Geology of South Donegal: A geological description to accompany the bedrock geology 1:100,000 scale map series, sheet 3 and part of sheet 4, South Donegal. With contributions from G. I. Alsop, P. O'Connor, K. Claringbold, and C. Cronin. Geological Survey of Ireland, 116 pp.Google Scholar
Lowe, C. & Jacob, A. W. B. 1989. A north south seismic profile across the Caledonian suture zone in Ireland. Tectonophysics 168, 297–318.CrossRefGoogle Scholar
Marcantonio, F., Dickin, A. P., McNutt, R. H. & Heaman, L. M. 1988. A 1,800-million-year-old Proterozoic gneiss terrane in Islay with implications for the crustal structure and evolution of Britain. Nature 335, 62–4.CrossRefGoogle Scholar
Max, M. D. & Long, C. B. 1985. Pre-Caledonian basement in Ireland and its cover relationships. Geological Journal 20, 341–66.CrossRefGoogle Scholar
Max, M. D. & Riddihough, R. P. 1975. Continuation of the Highland Boundary Fault in Ireland. Geology 10, 206–10.2.0.CO;2>CrossRefGoogle Scholar
Menuge, J. F. & Daly, J. S. 1990. Proterozoic evolution of the Erris Complex, NW Mayo, Ireland: neodymium isotope evidence. In Mid Proterozoic Laurentia–Baltica (eds Gower, C. F., Rivers, T. & Ryan, B.), pp. 41–52. Geological Association of Canada, Special Paper no. 38.Google Scholar
Muir, R. J., Fitches, W. R. & Maltman, A. J. 1994. The Rhinns Complex: Proterozoic basement on Islay and Colonsay, Inner Hebrides, Scotland, and on Inishtrahull, NW Ireland. Transactions of the Royal Society of Edinburgh: Earth Sciences 85, 77–90.CrossRefGoogle Scholar
Muir, R. J., Fitches, W. R. & Maltman, A. J. 1995. The Colonsay Group and basement–cover relationships on the Rhinns of Islay, Inner Hebrides. Scottish Journal of Geology 31, 1–6.CrossRefGoogle Scholar
Pidgeon, R. T. & Compston, W. 1992. A SHRIMP ion microprobe study of inherited and magmatic zircons from 4 Scottish Caledonian granites. Transactions of the Royal Society Edinburgh: Earth Sciences 83, 473–83.CrossRefGoogle Scholar
Powell, D. 1965. Comparison of calc-silicate bands from the Moine schists of Inverness-shire with similar bands from Moine-like rocks in Donegal. Nature 206, 180–1.CrossRefGoogle Scholar
Rainbird, R. H., Hamilton, M. A. & Young, G. M. 2001. Detrital zircon geochronology and provenance of the Torridonian, NW Scotland. Journal of the Geological Society, London 158, 15–27.CrossRefGoogle Scholar
Readman, P. W., O'Reilly, B. M. & Murphy, T. 1997. Gravity gradients and upper crustal tectonic fabrics, Ireland. Journal of the Geological Society, London 154, 817–28.CrossRefGoogle Scholar
Roddick, J. C. & Max, M. D. 1975. A Laxfordian age from the Inishtrahull platform, County Donegal, Ireland. Scottish Journal of Geology 19, 97–102.CrossRefGoogle Scholar
Ryan, P. D., Soper, N. J., Snyder, D. B., England, R. W. & Hutton, D. H. W. 1995. The Antrim–Galway Line: a resolution of the Highland Border Fault enigma of the Caledonides of Britain and Ireland. Geological Magazine 132, 171–84.CrossRefGoogle Scholar
Sanders, I. S. 1994. The northeast Ox Mountains inlier, Ireland. In A Revised Correlation of Precambrian rocks in Britain and Ireland (eds Gibbons, W. & Harris, A. L.), pp. 63–4. Geological Society of London, Special Report no. 22.CrossRefGoogle Scholar
Sanders, I. S., Daly, J. S. & Davies, G. R. 1987. Late Proterozoic high-pressure granulite facies metamorphism in the north-east Ox inlier, north-west Ireland. Journal of Metamorphic Geology 5, 69–85.CrossRefGoogle Scholar
Scherer, E., Münker, C. & Mezger, K. 2001. Calibration of the lutetium hafnium clock. Science 293, 683–7.CrossRefGoogle ScholarPubMed
Snyder, D. B., England, R. W. & McBride, J. H. 1997. Linkage between mantle and crustal structures and its bearing on inherited structures in northwestern Scotland. Journal of the Geological Society, London 154, 79–83.CrossRefGoogle Scholar
Steinhoefel, G., Hegner, E. & Oliver, G. J. H. 2008. Chemical and Nd constraints on granitoid sources involved in the Caledonian Orogeny in Scotland. Journal of the Geological Society, London 165, 817–27.CrossRefGoogle Scholar
Thirlwall, M. F. & Anczkiewicz, R. 2004. Multidynamic isotope ratio analysis using MC-ICP-MS and the causes of secular drift in Hf, Nd and Pb isotope ratios. International Journal of Mass Spectrometry 235, 59–81.CrossRefGoogle Scholar
Thirlwall, M. F. & Walder, A. J. 1995. In situ hafnium isotope ratio analysis of zircon by inductively coupled plasma multiple collector mass spectrometry. Chemical Geology 122, 241–7.CrossRefGoogle Scholar
Tyrrell, S., Haughton, P. D. W. & Daly, J. S. 2007. Drainage re-organisation during break-up of Pangea revealed by in-situ Pb isotopic analysis of detrital K-feldspar. Geology 35, 971–4.CrossRefGoogle Scholar
Van Staal, C. R., Dewey, J. F., Mac Niocaill, C. & McKerrow, W. S. 1998. The Cambrian-Silurian tectonic evolution of the northern Appalachians and British Caledonides: history of a complex, west and southwest Pacific-style segment of Iapetus. In Lyell: the past is the key to the present (eds Blundell, D. J. & Scott, A. C.), pp. 199–242. Geological Society of London, Special Publication no. 143.Google Scholar
Vervoort, J. D. & Patchett, P. J. 1996. Behavior of hafnium and neodymium isotopes in the crust: Constraints from Precambrian crustally derived granites. Geochimica et Cosmochimica Acta 60, 3717–33.CrossRefGoogle Scholar
Warner, M., Morgan, J., Barton, P., Morgan, P., Price, C. & Jones, K. 1996. Seismic reflections from the mantle represent relict subduction zones within the continental lithosphere. Geology 24, 39–42.2.3.CO;2>CrossRefGoogle Scholar
Whitehouse, M. J. 1988. Granulite facies Nd-isotopic homogenization in the Lewisian complex of northwest Scotland. Nature 331, 705–7.CrossRefGoogle Scholar
Whitehouse, M. J. 1989. Sm–Nd evidence for diachronous crustal accretion in the Lewisian Complex of northwest Scotland. Tectonophysics 161, 245–56.CrossRefGoogle Scholar
Whitehouse, M. J. & Robertson, C. J. 1995. Isotopic evolution of the Lewisian complex of Tiree, Inner Hebrides and correlation with the mainland. Scottish Journal of Geology 31, 131–7.CrossRefGoogle Scholar
Wiedenbeck, M., Alle, P., Corfu, F., Griffin, W. L., Meirer, M., Oberli, F., Von Quadt, A., Roddick, J. C. & Spiegel, W. 1995. Three natural zircon standards for U–Th–Pb, Lu–Hf, trace element and REE analyses. Geostandards Newsletter 19, 1–23.CrossRefGoogle Scholar
Williams, I. S. 2001. Response of detrital zircon and monazite, and their U–Pb isotopic systems, to regional metamorphism and host-rock partial melting, Cooma Complex, southeastern Australia. Australian Journal of Earth Sciences 48, 557–80.CrossRefGoogle Scholar
Woodhead, J., Hergt, J., Shelley, M., Eggins, S. & Kemp, R. 2004. Zircon Hf-isotope analysis with an excimer laser, depth profiling, ablation of complex geometries, and concomitant age estimation. Chemical Geology 209, 121–35.CrossRefGoogle Scholar
Wu, F.-Y., Yang, Y.-H., Xie, L.-W., Yang, J.-H. & Xu, P. 2006. Hf isotopic compositions of the standard zircons and baddeleyites used in U–Pb geochronology. Chemical Geology 234, 105–26.CrossRefGoogle Scholar
Wu, Y.-B., Zheng, Y.-F., Zhang, S.-B., Zhao, Z.-F., Wu, F.-Y. & Liu, X.-M. 2007. Zircon U–Pb ages and Hf isotope compositions of migmatite from the North Dabie terrane in China: constraints on partial melting. Journal of Metamorphic Geology 25, 991–1009.CrossRefGoogle Scholar
Yang, J.-H., Wu, F.-Y., Wilde, S. A., Xie, L.-W., Yang, Y.-H., & Liu, X.-M. 2007. Tracing magma mixing in granite genesis: in situ U–Pb dating and Hf-isotope analysis of zircons. Contributions to Mineralogy and Petrology 153, 177–90.CrossRefGoogle Scholar
Zeh, A., Gerdes, A., Klemd, R. & Barton, J. M. 2007. Archaean to Proterozoic Crustal evolution in the Central Zone of the Limpopo Belt (South Africa–Botswana): Constraints from combined U–Pb and Lu–Hf isotope analyses of zircon. Journal of Petrology 48, 1605–39.CrossRefGoogle Scholar
Zheng, Y.-F., Wu, Y.-B., Zhao, Z.-F., Zhang, S.-B., Xu, P. & Wu, F.-Y. 2005. Metamorphic effect on zircon Lu–Hf and U–Pb isotope systems in ultrahigh-pressure eclogite-facies metagranite and metabasite. Earth and Planetary Science Letters 240, 378–400.CrossRefGoogle Scholar