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A complete arc-trench system recognized in Gondwana sequences of the Antarctic Peninsula region

Published online by Cambridge University Press:  01 May 2009

J. L. Smellie
J. L. Smellie*
Affiliation:
Institute of Geological Sciences, Murchison House, West Mains Road, Edinburgh, EH9 3LA
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Summary

Prior to Late Triassic–Early Jurassic times, the geological history of the Antarctic Peninsula region was dominated almost entirely by Gondwana sequences that together comprised a major arc-trench system. Subduction complex, trench-slope-break and fore-arc basin sedimentation can all be recognized, and deposition was at least partly on early Palaeozoic or older continental crust. The only evidence for a contemporaneous magmatic arc situated in the Antarctic Peninsula at this time consists of patchy occurrences of metavolcanic rocks, possibly representing the frontal edge of the arc, and the major outcrop area of these rocks is believed to lie under the broad shallow continental shelf E of the Antarctic Peninsula. This is contrary to most current hypotheses in which a marginal basin, presumably floored by oceanic crust, is thought to crop out close to the E coast of the Antarctic Peninsula. However, the complete absence of substantial outcrops of pre-Jurassic volcanic rocks anywhere in eastern Antarctica and South Africa, which are the closest and most likely places in which these should exist, supports the new proposal. Moreover, the identification of back-arc elements of the arc-trench system (foreland fold-thrust belt and retro-arc foreland basin) in eastern Antarctica and South Africa greatly strengthens the likelihood of the arc cropping out in the area suggested.

Towards the end of the Triassic and during the Early Jurassic Periods, an intense diastrophic event, or culmination of events, of orogenic magnitude occurred (Gondwanian orogeny), causing substantial redistribution of the pre-existing elements of the arc-trench system. In particular, all the fore-arc sequences were strongly deformed, some possibly for the first time (e.g. in the fore-arc basin), and became firmly accreted to the continental margin. Moreover, the magmatic foci migrated trenchwards to intrude the deformed rocks in the Antarctic Peninsula. Because many of the plutons were emplaced synkinematically, they often closely resemble ‘basement’ gneisses. The distinction between these rocks remains a serious problem in the Antarctic Peninsula and it can be solved only partially by radiometric dating.

Type
Research Article
Information
Geological Magazine , Volume 118 , Issue 2 , March 1981 , pp. 139 - 159
Copyright
Copyright © Cambridge University Press 1981

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References

Adie, R. J. 1954. The petrology of Graham Land. I. The Basement Complex; early Palaeozoic plutonic and volcanic rocks. Scient. Rep. Falkld Isl. Depend. Surv. no. 11.Google Scholar
Adie, R. J. 1957. The petrology of Graham Land. III. Metamorphic rocks of the Trinity Peninsula Series. Scient. Rep. Falkld Isl. Depend. Surv. no. 20.Google Scholar
Adie, R. J. 1964. Geological history. In Antarctic Research (ed. Priestley, R. E., Adie, R. J. and Robin, G. de Q.), pp. 118–62. London: Butterworth.Google Scholar
Adie, R. J. 1972. Evolution of volcanism in the Antarctic Peninsula. In Antarctic geology and geophysics (ed. Adie, R. J.), pp. 137–42. Oslo: Universitetsforlaget.Google Scholar
Adie, R. J. 1977. The geology of Antarctica; a review. Phil. Trans. R. Soc. B 279 123–30.Google Scholar
Aitkenhead, N. 1975. The geology of the Duse Bay–Larsen Inlet area, north-east Graham Land (with particular reference to the Trinity Peninsula Series). Scient. Rep. Br. antarct. Surv. no. 51.Google Scholar
Ashcroft, W. A. 1972. Crustal structure of the South Shetland Islands and Bransfield Strait. Scient. Rep. Br. antarct. Surv. no. 66.Google Scholar
Barker, P. F., Dalziel, I. W. D. 1976. Evolution of the southwestern Atlantic Ocean basin: results of Leg 36, Deep Sea Drilling Project. In Initial Reports of the Deep Sea Drilling Project, vol. 36 (ed. Barker, P. F., Dalziel, I. W. D., and others), pp. 993–1014. Washington: Government Printing Office.Google Scholar
Barker, P. F. & Griffiths, D. H. 1972. The evolution of the Scotia Ridge and Scotia Sea. Phil. Trans. R. Soc. Lond. A 271 151–83.Google Scholar
Barker, P. F. & Griffiths, D. H. 1977. Towards a more certain reconstruction of Gondwanaland. Phil. Trans. R. Soc. Lond. B 279 143–59.Google Scholar
Barrett, P. J. & Elliot, D. H. 1972. The early Mesozoic volcaniclastic Prebble Formation, Beardmore Glacier area. In Antarctic Geology and Geophysics (ed. Adie, R. J.), pp. 403–10. Oslo: Universitetsforlaget.Google Scholar
Barrett, P. J., Grindley, G. W. & Webb, P. N. 1972. The Beacon Supergroup of East Antarctica. In Antarctic Geology and Geophysics (ed. Adie, R. J.), pp. 319–32. Oslo: Universitetsforlaget.Google Scholar
Beckinsale, R. D., Tarney, J., Darbyshire, D. P. F. & Humm, M. J. 1976. Rb–Sr and K–Ar age determinations on samples of the Falkland Plateau basement at site 330, DSDP. In Initial Reports of the Deep Sea Drilling Project, vol. 36 (ed. Barker, P. F., Dalziel, I. W. D., and others), pp. 923–27. Washington: Government Printing Office.Google Scholar
Bell, C. M. 1973. The geology of southern Alexander Island. Bull. Br. antarct. Surv. nos 33/34, 1–16.Google Scholar
Bell, C. M. 1974. Geological observations in northern Alexander Island. Bull. Br. antarct. Surv., no. 39, 35–44.Google Scholar
Bell, C. M. 1975. Structural geology of parts of Alexander Island. Bull. Br. antarct. Surv. nos 41/ 42, 43–58.Google Scholar
Brook, D. 1972. Stratigraphy of the Theron Mountains. Bull. Br. antarct. Surv. no. 29, 67–89.Google Scholar
Cingolani, C. A. & Varela, R. 1975. Investigaciones geologicas y geochronologicas en el extremo sur de la Isla Gran Malvina, sector de Cabo Belgrano (Cabo Meredith), Islas Malvinas. Actas del Sexto Congreso Geologico Argentino, pp. 457–73.Google Scholar
Clarkson, P. D. & Brook, M. 1977. Age and position of the Ellsworth Mountains crustal fragment, Antarctica. Nature, Lond. 265, 615–6.CrossRefGoogle Scholar
Craddock, C. 1972. Antarctic tectonics (Review). In Antarctic Geology and Geophysics (ed. Adie, R. J.), pp. 449–56. Oslo: Universitetsforlaget.Google Scholar
Dalziel, I. W. D. 1969. Structural studies in the Scotia arc: Livingston Island. Antarct. J.U.S. 4, 137.Google Scholar
Dalziel, I. W. D. 1972(a). Large-scale folding in the Scotia arc. In Antarctic Geology and Geophysics (ed. Adie, R. J.), pp. 47–55. Oslo: Universitetsforlaget.Google Scholar
Dalziel, I. W. D. 1972(b). K–Ar dating of rocks from Elephant Island, South Scotia Ridge. Bull. geol. Soc. Am. 83 1887–94.CrossRefGoogle Scholar
Dalziel, I. W. D. 1974. Evolution of the margins of the Scotia Sea. In The Geology of Continental Margins (ed. Burk, C. A. and Drake, C. L.), pp. 567–80. Berlin, Heidelberg, New York: Springer-Verlag.CrossRefGoogle Scholar
Dalziel, I. W. D. 1975. Scotia Arc Tectonics Project, 1969–1975. Antarct. J. U.S. 10 70–81.Google Scholar
Dalziel, I. W. D. 1976. Structural studies in the Scotia arc: ‘basement’ rocks of the South Shetland Islands (R/V Hero Cruise 76–1). Antarct. J. U.S. 11 75–77.Google Scholar
Dalziel, I. W. D. (In the press.)The pre-Jurassic history of the Scotia arc: a review and progress report. In Antarctic Geoscience (ed. Craddock, C.). Madison: University of Wisconsin Press.Google Scholar
Dalziel, I. W. D. & Elliot, D. H. 1971. Evolution of the Scotia arc. Nature, Lond. 233 246–52.CrossRefGoogle ScholarPubMed
Dalziel, I. W. D. & Elliot, D. H. 1973. The Scotia arc and Antarctic margin. In The Ocean Basins and Their Margins. Vol. I. The South Atlantic (ed. Stehli, F. G. and Nairn, A. E. M.), pp. 171–246. New York: Plenum.Google Scholar
Dalziel, I. W. D., Elliot, D. H., Thomson, J. W., Thomson, M. R. A., Wells, N. A. & Zinsmeister, W. J. 1977. Geologic studies in the South Orkney Islands: R/V Hero Cruise 77–1, January 1977. Antarct. J. U.S. 12 98–101.Google Scholar
De Wit, M. J. 1977. The evolution of the Scotia arc as a key to the reconstruction of southwestern Gondwanaland. Tectonophysics 37 53–81.CrossRefGoogle Scholar
De Wit, M. J., Dutch, S., Kligfield, R., Allen, R. & Stern, C. 1977. Deformation, serpentinization and emplacement of a dunite complex, Gibbs Island, South Shetland Islands: possible fracture zone tectonics. J. Geol. 85, 745–62.CrossRefGoogle Scholar
Dickinson, W. R. 1976. Sedimentary basins developed during evolution of Mesozoic–Cenozoic arc-trench system in western North America. Can. J. Earth Sci. 13 1268–87.CrossRefGoogle Scholar
Dickinson, W. R. & Rich, E. I. 1972. Petrologic intervals and petrofacies in the Great Valley Sequence, Sacramento Valley, California. Bull. geol. Soc. Am. 83, 3007–24.CrossRefGoogle Scholar
Dickinson, W. R. & Seely, D. R. 1979. Structure and stratigraphy of forearc basins. Bull. Am. Assoc. Petrol. Geol. 63 2–31.Google Scholar
Dietz, R. S., Holden, J. C. & Sproll, W. P. 1972. Antarctica and continental drift. In Antarctic Geology and Geophysics (ed. Adie, R. J.), pp. 837–42. Oslo: Universitetsforlaget.Google Scholar
Dingle, R. V. & Scrutton, R. A. 1974. Continental breakup and the development of post-Palaeozoic sedimentary basins around southern Africa. Bull. geol. Soc. Am. 85 1467–74.2.0.CO;2>CrossRefGoogle Scholar
Edwards, C. W. (In the press). Further palaeontological evidence of Triassic sedimentation in western Antarctica. In Antarctic Geoscience (ed. Craddock, C.). Madison: University of Wisconsin Press.Google Scholar
Elliot, D. H. 1965. Geology of north-west Trinity Peninsula, Graham Land. Bull. Br. antarct. Surv. no. 7, 1–24.Google Scholar
Elliot, D. H. 1966. Geology of the Nordenskjöld Coast and a comparison with north-west Trinity Peninsula. Bull. Br. antarct. Surv. no. 10 1–43.Google Scholar
Elliot, D. H. 1967. The geology of Joinville Island. Bull. Br. antarct. Surv. no. 12 23–40.Google Scholar
Elliot, D. H. 1972. Aspects of Antarctic geology and drift reconstruction. In Antarctic Geology and Geophysics (ed. Adie, R. J.), pp. 849–58. Oslo: Universitetsforlaget.Google Scholar
Elliot, D. H. 1975(a). Gondwana basins of Antarctica. In Gondwana Geology. Papers Presented at the Third Gondwana Symposium, Canberra, Australia, 1973 (ed. Campbell, K. S. W.), pp. 493–536. Canberra: Australian National University Press.Google Scholar
Elliot, D. H. 1975(b). Tectonics of Antarctica: a review. Am. J. Sci. A 275, 45–106.Google Scholar
Elliot, D. H. & Watts, D. R. 1974. The nature and origin of volcaniclastic material in some Karroo and Beacon rocks. Trans. Geol. Soc. S. Aft. 77 109–11.Google Scholar
Fleet, M. 1965. Metamorphosed limestone in the Trinity Peninsula Series of Graham Land. Bull. Br. antarct. Surv. no. 7 73–76.Google Scholar
Fleet, M. 1968. The geology of the Oscar II Coast, Graham Land. Scient. Rep. Br. antarct. Surv. no. 59.Google Scholar
Ford, A. B. 1972. Weddell orogeny–latest Permian to early Mesozoic deformation at the Weddell Sea margin of the Transantarctic Mountains. In Antarctic Geology and Geophysics (ed. Adie, R. J.), pp. 419–26. Oslo: Universitetsforlaget.Google Scholar
Fraser, A. G. & Grimley, P. H. 1972. The geology of parts of the Bowman and Wilkins Coasts, Antarctic Peninsula. Scient. Rep. Br. antarct. Surv. no. 67.Google Scholar
Gledhill, A., Rex, D. C. & Tanner, P. W. G. (In the press.) Rb–Sr and K-Ar geochronology of rocks from the Antarctic Peninsula between Anvers Island and Marguerite Bay. In Antarctic Geoscience (ed. Craddock, C.). Madison: University of Wisconsin Press.Google Scholar
Grikurov, G. E. & Dibner, A. F. 1968. Novye dannye o Serii Triniti (C1–2) v zapadnoy Antarktide. [New data on the Trinity Series (C1–2) in west Antarctica.] Dokl. Akad. Nauk SSSR 179 410–12. (English translation: Dokl. (Proc.) Acad. Sci. U.S.S.R. (Geological sciences), 179 39–41.)Google Scholar
Grikurov, G. E., Krylov, A. Ya. & Silin, Yu. I. 1967. Absolutnyy vozrast nekotorykh porod dugi Skottia i Zemli Aleksandra I (Zapadnaya Antarktika). [Absolute age of some rocks from the Scotia arc and Alexander I Land (western Antarctica).] Dokl. Akad. Nauk SSSR 172 168–71. (English translation: Dokl (Proc.) Acad. Sci. U.S.S.R. (Geological sciences), 172 19–22.)Google Scholar
Halbich, I. W. 1977. Fold profiles and tectonic shortening in the Cape Fold Belt. Trans. Geol. Soc. S. Afr. 80, 253–65.Google Scholar
Halpern, M. 1964. Cretaceous sedimentation in the ‘General Bernardo O'Higgins’ area of north-west Antarctic Peninsula. In Antarctic geology (ed. Adie, R. J.), pp. 334–47. Amsterdam: North-Holland.Google Scholar
Halpern, M. 1972. Rb–Sr total-rock and mineral ages from the Marguerite Bay area, Kohler Range and Fosdick Mountains. In Antarctic Geology and Geophysics (ed. Adie, R. J.), pp. 197–204. Oslo: Universitetsforlaget.Google Scholar
Hobbs, G. J. 1968. The geology of the South Shetland Islands. IV. The geology of Livingston Island. Scient. Rep. Br. antarct. Surv. no. 47.Google Scholar
Iltchenko, L. N. 1972. Late Precambrian acritarchs of Antarctica. In Antarctic Geology ana Geophysics (ed. Adie, R. J.), pp. 599–602. Oslo: Universitetsforlaget.Google Scholar
Ingersoll, R. V. 1978. Petrofacies and petrologic evolution of the Late Cretaceous fore-arc basin, northern and central California. J. Geol. 86, 335–52.CrossRefGoogle Scholar
Karig, D. E. 1977. Growth patterns on the upper trench slope. In Island Arcs, Deep Sea Trenches and Back-arc Basins (ed. Talwani, M. and Pitman, W. C.), pp. 175–85. Washington: American Geophysical Union.CrossRefGoogle Scholar
Karig, D. E. & Sharman, G. F. 1975. Subduction and accretion in trenches. Bull. geol. Soc. Am. 86, 377–89.2.0.CO;2>CrossRefGoogle Scholar
Larson, R. L. & Ladd, J. W. 1973. Evidence for the opening of the South Atlantic in the Early Cretaceous. Nature, Lond. 246, 209–12.CrossRefGoogle Scholar
Laudon, T. S. 1972. Stratigraphy of eastern Ellsworth Land. In Antarctic Geology and Geophysics (ed. Adie, R. J.), pp. 215–24. Oslo: Universitetsforlaget.Google Scholar
Martini, J. E. T. 1974. On the presence of ash beds and volcanic fragments in the greywackes of the Karroo System in the southern Cape Province (South Africa). Trans. Geol. Soc. S. Afr. 77 113–6.Google Scholar
Miller, H. (In the press). Geological comparison between the Antarctic Peninsula and southern South America. In Antarctic Geoscience (ed. Craddock, C.). Madison: University of Wisconsin Press.Google Scholar
Miller, J. A. 1960. Potassium–argon ages of some rocks from the South Atlantic. Nature, Lond. 187 1019–20.CrossRefGoogle Scholar
Miyashiro, A. 1972. Metamorphism and related magmatism in plate tectonics. Am. J. Sci. 272 629–56.CrossRefGoogle Scholar
Moore, J. C. & Karig, D. E. 1976. Development of sedimentary basins on the lower trench slope. Geology 4, 693–97.2.0.CO;2>CrossRefGoogle Scholar
Newton, A. R. 1973. A gravity-folding model for the Cape Fold Belt. Trans. Geol. Soc. S. Afr. 76, 145–52.Google Scholar
Ojakangas, R. W. 1968. Cretaceous sedimentation, Sacramento Valley, California. Bull. geol. Soc. Am. 79 973–1008.CrossRefGoogle Scholar
Orlando, H. A. 1968. A new Triassic flora from Livingston Island, South Shetland Islands. Bull. Br. antarct. Surv. no. 16 1–14.Google Scholar
Rex, D. C. 1976. Geochronology in relation to stratigraphy of the Antarctic Peninsula. Bull. Br. antarct. Surv. no. 43 49–58.Google Scholar
Rex, D. C. & Tanner, P. W. G. (In the press.) Precambrian age for gneisses at Cape Meredith in the Falkland Islands (Islas Malvinas). In Antarctic Geoscience (ed. Craddock, C.). Madison: University of Wisconsin Press.Google Scholar
Rivano, S. & Cortes, R. 1976. Note on the presence of the lawsonite–sodic amphibole association on Smith Island, South Shetland Islands, Antarctica. Earth planet. Sci. Lett. 29, 34–6.CrossRefGoogle Scholar
Rowe, P. J. 1973. The geology of the area between Riley and Bertram Glaciers, Palmer Land. Bull. Br. antarct. Surv. no. 35 51–72.Google Scholar
Rowley, P. D. & Williams, P. L. (In the press.) Geology of the northern Lassiter Coast and southern Black Coast, Antarctic Peninsula. In Antarctic Geoscience (ed. Craddock, C.). Madison: University of Wisconsin Press.Google Scholar
Rust, I. C. 1975. Tectonic and sedimentary framework of Gondwana Basins in southern Africa. In Gondwana Geology. Papers Presented at the Third Gondwana Symposium, Canberra, Australia, 1973 (ed. Campbell, K. S. W.), pp. 537–64. Canberra: Australian National University Press.Google Scholar
Schopf, J. M. 1969. Ellsworth Mountains: position in west Antarctica due to sea-floor spreading. Science, N. Y. 164, 63–66.CrossRefGoogle ScholarPubMed
Schopf, J. M. 1973. Plant material from the Miers Bluff Formation of the South Shetland Islands. Rep. Inst. polar Stud. Ohio State Univ. no. 45.Google Scholar
Skinner, A. C. 1973. Geology of north-western Palmer Land between Eureka and Meiklejohn Glaciers. Bull. Br. antarct. Surv. no. 35 1–22.Google Scholar
Smellie, J. L. (In the press.) Syn-plutonic origin and Tertiary age for the (?) Precambrian False Bay schists of Livingston Island, South Shetland Islands. Bull. Br. antarct. Surv. Google Scholar
Smellie, J. L. & Clarkson, P. D. 1975. Evidence for pre-Jurassic subduction in western Antarctica. Nature, Lond. 258 701–2.CrossRefGoogle Scholar
Stephenson, P. J. 1966. Geology. l. Theron Mountains, Shackleton Range and Whichaway Nunataks (with a section on palaeomagnetism of the dolerite intrusions, by D. J. Blundell). Scient. Rep. transantarct. Exped. no. 8.Google Scholar
Suàrez, M. 1976. Plate-tectonic model for southern Antarctic Peninsula and its relation to southern Andes. Geology 4 211–14.2.0.CO;2>CrossRefGoogle Scholar
Tarney, J. 1976. Petrology, mineralogy, and geochemistry of the Falkland Plateau basement rocks, site 330, Deep Sea Drilling Project. In Initial Reports of the Deep Sea Drilling Project, vol. 36 (Barker, P. F., Dalziel, I. W. D., and others), pp. 893–921. Washington: Government Printing Office.Google Scholar
Theron, J. C. 1975. Sedimentological evidence for the extension of the African Continent southwards during the Late Permian-Early Triassic times. In Gondwana Geology. Papers Presented at the Third Gondwana Symposium, Canberra, Australia, 1973 (ed. Campbell, K. S. W.), pp. 67–71. Canberra: Australian National University Press.Google Scholar
Thompson, R. W. 1976. Mesozoic sedimentation on the eastern Falkland Plateau. In Initial Reports of the Deep Sea Drilling Project, vol. 36 (Barker, P. F., Dalziel, I. W. D., and others), pp. 877–91. Washington: Government Printing Office.Google Scholar
Thomson, J. W. 1968. The geology of the South Orkney Islands. II. The petrology of Signy Island. Scient. Rep. Br. antarct. Surv. no. 62.Google Scholar
Thomson, J. W. 1973. The geology of Powell, Christoffersen and Michelsen Islands, South Orkney Islands. Bull. Br. antarct. Surv. nos 33/ 34, 137–67.Google Scholar
Thomson, J. W. 1974. The geology of the South Orkney Islands. IV. Coronation Island. Scient. Rep. Br. antarct. Surv. no. 86.Google Scholar
Thomson, M. R. A. 1975. New palaeontological and lithological observations on the Legoupil Formation, north-west Antarctic Peninsula. Bull. Br. antarct. Surv. nos 41 /42, 169–85.Google Scholar
Thomson, M. R. A. (In the press.) Mesozoic paleogeography of western Antarctica. In Antarctic Geoscience (ed. Craddock, C.). Madison: University of Wisconsin Press.Google Scholar
Thomson, M. R. A., Laudon, T. S. & Boyles, J. M. 1978. Stratigraphical studies in Orville Coast and eastern Ellsworth Land. Antarct. J. U.S. 13 9–10.Google Scholar
Turner, B. R. 1977. Fluviatile cross-bedding patterns in the Upper Triassic Molteno Formation of the Karoo (Gondwana) Supergroup in South Africa and Lesotho. Trans. Geol. Soc. S. Afr. 80 241–52.Google Scholar
Williams, P. L., Schmidt, D. L., Plummer, C. C. & Brown, L. W. 1972. Geology of the Lassiter Coast area, Antarctic Peninsula: preliminary report. In Antarctic Geology and Geophysics (ed. Adie, R. J.), pp. 143–48. Oslo: Universitetsforlaget.Google Scholar