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Field and petrographical insight into the formation of orbicular granitoids from the Bonney Pluton, southern Victoria Land, Antarctica

Published online by Cambridge University Press:  03 July 2013

ROBERT W. SMILLIE  and
ROSE E. TURNBULL
ROBERT W. SMILLIE
Affiliation:
Ok Tedi Mining Ltd Exploration Department, PO Box 1, Tabubil, Western Province, Papua New Guinea
ROSE E. TURNBULL*
Affiliation:
GNS Science, Dunedin Research Centre, Private Bag 1930, Dunedin 9054, New Zealand
*
‡Author for correspondence: r.turnbull@gns.cri.nz
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Abstract

The diversity of orbicule types exposed within granitoids of the Bonney Pluton in southern Victoria Land attests to the dynamic and complex interplay of magmatic processes that were responsible for their formation. Orbicules formed in small pockets of H2O-rich silicate melt that was extracted from the crystallizing and fractionating Bonney Pluton magma and concentrated along the pluton margins. These pockets of melt experienced a superheating event that destroyed almost all pre-existing nuclei and a subsequent delay in crystallization, which led to undercooling conditions that promoted rapid dendritic crystal growth. Superheating was induced by the injection of hot mafic magmas, evidenced by elevated plagioclase XAn, and Mg-Al-Ti-contents in hornblende that point to a higher temperature and a more mafic composition in the melt that the orbicule shells crystallized from. Variation in the type and structure of orbicules (hornblende-rich versus plagioclase-rich shells) were likely due to repeated changes in the composition, H2O-content, temperature and PH2O at the crystallizing orbicule boundary layer in response to pulses in the movement of magma, competition between crystallizing phases, episodic vesiculation, degassing and/or second boiling which dictated the composition, texture and size of individual orbicule shells. Brittle fragmentation of orbicules occurred in response to vesiculation and fragmented orbicules are often found as cores within intact orbicules, indicating that multiple phases of orbicule formation were common. The alignment and compaction of orbicules in ‘pods’ indicates movement of orbicules within the melt-rich pockets occurred, prior to resumption of near-equilibrium crystallization in the host granite.

Type
Original Articles
Information
Geological Magazine , Volume 151 , Issue 3 , May 2014 , pp. 534 - 549
Copyright
Copyright © Cambridge University Press 2013 

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References

Allibone, A. H., Cox, S. C., Graham, I. J., Smillie, R. W., Johnstone, R. D., Ellery, S. G. & Palmer, K. 1993 a. Granitoids of the Dry Valleys area, southern Victoria Land, Antarctica: plutons, field relationships, and isotopic dating. New Zealand Journal of Geology and Geophysics 36, 281–97.Google Scholar
Allibone, A. H., Cox, S. C. & Smillie, R. W. 1993 b. Granitoids of the Dry Valleys areas, southern Victoria Land: geochemistry and evolution along the Early Paleozoic Antarctic Craton margin. New Zealand Journal of Geology and Geophysics 36, 299–316.Google Scholar
Allibone, A. H. & Norris, R. J. 1992. Segregation of leucogranite microplutons during syn-anatectic deformation: an example from the Taylor Valley, Antarctica. Journal of Metamorphic Geology 10, 589–600.Google Scholar
Allibone, A. H. & Wysoczanski, R. 2002. Initiation of magmatism during the Cambrian–Ordovician Ross orogeny in southern Victoria Land, Antarctica. Geological Society of America Bulletin 114, 1007–18.Google Scholar
Anderson, J. L. & Smith, D. R. 1995. The effects of temperature and f O2 on the Al-in-hornblende barometer. American Mineralogist 80, 549–59.Google Scholar
Bachmann, O. & Bergantz, G. W. 2006. Gas percolation in upper-crustal silicic crystal mushes as a mechanism for upward heat advection and rejuvenation of near-solidus magma bodies. Journal of Volcanology and Geothermal Research 149, 85–102.Google Scholar
Bachmann, O., Deering, C. D., Ruprecht, J. S., Huber, C., Skopelitis, A. & Schnyder, C. 2012. Evolution of silicic magmas in the Kos-Nisyros volcanic centre, Greece: cycles associated with caldera collapse. Contributions to Mineralogy and Petrology 165, 151–66.Google Scholar
Burnham, C. W. 1985. Energy release in subvolcanic environments; implications for breccia formation. Economic Geology 80, 1515–22.Google Scholar
Candela, P. A. 1997. A review of shallow, ore-related granites: textures, volatiles, and ore metals. Journal of Petrology 38, 1619–33.Google Scholar
Coleman, D. S., Gray, W. & Glazner, A. F. 2004. Rethinking the emplacement and evolution of zoned plutons: geochronologic evidence for incremental assembly of the Tuolumne Intrusive Suite, California. Geology 32, 433–6.Google Scholar
Cox, S. C. 1993. Inter-related plutonism and deformation in South Victoria Land, Antarctica. Geological Magazine 130, 1–14.Google Scholar
Cox, S. C. & Allibone, A. H. 1991 Petrogenesis of orthogneisses in the Dry Valleys region, South Victoria Land. Antarctic Science 3, 405–17.Google Scholar
Cox, S. C., Turnbull, I. M., Isaac, M. J., Townsend, D. B. & Smith Lyttle, B. (compilers) 2012. Geology of Southern Victoria Land, Antarctica. Institute of Geological & Nuclear Sciences 1:250 000 geological map 22. 1 sheet + map text. Institute of Geological and Nuclear Sciences Limited, Lower Hutt, New Zealand.Google Scholar
Dahl, P. S. & Palmer, D. F. 1983. The petrology and origin of orbicular tonalite from western Taylor Valley, southern Victoria Land, Antarctica. In Antarctic Earth Science (Oliver, R. L., James, P. R. & Jago, J. B. eds), pp. 156–9. Australian Academy of Science, Canberra.Google Scholar
Dowling, K. & Morrison, G. 1988. Application of quartz textures to the classification of gold deposits using north Queensland examples. Economic Geology Monograph 6, 342–55.Google Scholar
Dufek, J. D. & Bachmann, O. 2010. Quantum magmatism: magmatic compositional gaps generated by melt-crystal dynamics. Geology 38, 687–90.Google Scholar
Eichelberger, J. C. 1980. Vesiculation of mafic magma during replenishment of silicic magma reservoirs. Nature 288, 446–50.Google Scholar
Elliston, J. N. 1984. Orbicules: an indication of the crystallisation of hydrosilicates, I. Earth Science Reviews 20, 265–344.Google Scholar
Encarnacion, J. & Grunow, A. 1996. Changing magmatic and tectonic styles along the paleo-Pacific margin of Gondwana and the onset of early Paleozoic magmatism in Antarctica. Tectonics 15, 1325–41.Google Scholar
Frindt, S. & Haapala, I. 2004. Anorogenic Gross Spitzkoppe granite stock in central western Namibia: Part II. Structures and textures indicating crystallisation from undercooled melt. American Mineralogist 89, 857–66.Google Scholar
Frost, T. P. & Mahood, G. A. 1987. Field, chemical, and physical constraints on mafic-felsic magma interaction in the Lamarck Granodiorite, Sierra Nevada, California. Geological Society of America Bulletin 99, 272–91.Google Scholar
Grosse, P., Toselli, A. J. & Rossi, J. N. 2010. Petrology and geochemistry of the orbicular granitoid of Sierra de Velasco (NW Argentina) and implications for the origin of orbicular rocks. Geological Magazine 147, 451–68.Google Scholar
Hibbard, M. J. 1995. Petrography to Petrogenesis. Prentice Hall, New Jersey.Google Scholar
Holland, T. & Blundy, J. 1994. Non-ideal interactions in calcic amphiboles and their bearing on amphibole-plagioclase thermometry. Contributions to Mineralogy and Petrology 116, 433–47.Google Scholar
Johannes, W. & Holtz, F. 1996. Petrogenesis and Experimental Petrology of Granitic Rocks. Springer-Verlag, Berlin, Germany.Google Scholar
Leveson, D. J. 1966. Orbicular rocks: a review. Geological Society of America Bulletin 77, 409–26.Google Scholar
Lindh, A. & Nasstrom, H. 2006. Crystallization of orbicular rocks exemplified by the Slattemossa occurrence, southeastern Sweden. Geological Magazine 143, 713–22.Google Scholar
Lofgren, G. E. 1974. Temperature induced zoning in synthetic plagioclase feldspar. In The Feldspars (eds McKenzie, W. S. & Zussman, J.), pp. 362–75. University of Manchester Press, Manchester.Google Scholar
Lofgren, G. E. & Donaldson, C. H. 1975. Curved branching crystals and differentiation in comb-layered rocks. Contributions to Mineralogy and Petrology 49, 309–19.Google Scholar
London, D. 2008. Pegmatites. Canadian Mineralogist Special Publication 10, 347 pp.Google Scholar
London, D. & Kontak, D. J. 2012. Granitic pegmatites: scientific wonders and economic bonanzas. Elements 8, 257–61.Google Scholar
Martin, V. M., Pyle, D. M. & Holness, M. B. 2006. The role of crystal frameworks in the preservation of enclaves during magma mixing. Earth and Planetary Science Letters 248, 787–99.Google Scholar
McBirney, A. R. & Noyes, R. M. 1979. Crystallization and layering of the Skaergaard Intrusion. Journal of Petrology 20, 487–554.Google Scholar
Miller, C. F., Furbish, D. J., Walker, B. A., Claiborne, L. L., Koteas, G. C., Bleick, H. A. & Miller, J. S. 2011. Growth of plutons by incremental emplacement of sheets in crystal-rich host: evidence from Miocene intrusions of the Colorado River region, Nevada, USA. Tectonophysics 500, 65–77.Google Scholar
Miller, C. F. & Paterson, S. R. 2001. Construction of mid-crustal sheeted plutons; examples from the North Cascades, Washington. Geological Society of America Bulletin 113, 1423–42.Google Scholar
Monod, O., Perez-Segura, E., Richard, D. & Calmus, T. 1995. Orbicular granite sills in the Mazatan core complex, Sonora, Mexico. Revista Mexicana de Ciencias Geologicas 12, 9–16.Google Scholar
Moore, J. G. & Lockwood, J. P. 1973. Origin of comb layering and orbicular structure, Sierra Nevada batholith, California. Geological Society of America Bulletin 84, 1–20.Google Scholar
Neef, G. 1991. Rod-like and orbicular structure in mid Devonian feldspar porphyries, New South Wales, Australia. Lithos 27, 205–12.Google Scholar
Ort, M. H. 1992. Orbicular volcanic rocks of Cerro Panizos: their origin and implications for orb formation. Geological Society of America Bulletin 104, 1048–58.Google Scholar
Palmer, D. F., Bradley, J. & Prebble, W. M. 1967. Orbicular granodiorite from Taylor Valley, south Victoria Land. Geological Society of America Bulletin 78, 1423–8.Google Scholar
Pichavant, M. 1981. An experimental study of the effect of boron on a water saturated haplogranite at 1 kbar vapour pressure. Contributions to Mineralogy and Petrology 76, 430–9.Google Scholar
Putirka, K. D. 2005. Igneous thermometers and barometers based on plagioclase + liquid equilibria: tests of some existing models and new calibrations. American Mineralogist 90, 336–46.Google Scholar
Shelley, D. 1993. Igneous and Metamorphic Rocks under the Microscope: Classification, Textures, Microstructures, and Mineral Preferred-Orientations. Chapman & Hall.Google Scholar
Smillie, R. W. 1992. Suite subdivision and petrological evolution of granitoids from the Taylor Valley and Ferrar Glacier region, south Victoria Land. Antarctic Science 4, 71–87.Google Scholar
Sparks, S. R. J., Sigurdsson, H. & Wilson, L. 1977. Magma mixing: a mechanism for triggering acid explosive eruptions. Nature 267, 315–18.Google Scholar
Sylvester, A. G. 2011. The nature and polygenetic origin of orbicular granodiorite in the Lower Castle Creek pluton, northern Sierra Nevada batholith, California. Geosphere 7, 1134–42.Google Scholar
Symes, R. F., Bevan, J. C. & Qasim Jan, M. 1987. The nature and origin of orbicular rocks from near Deshai, Swat Kohistan, Pakistan. Mineralogical Magazine 51, 635–47.Google Scholar
Thompson, T. B. & Giles, D. L. 1974. Orbicular rocks of the Sandia Mountains, New Mexico. Geological Society of American Bulletin 85, 911–16.Google Scholar
Turnbull, R. E., Deering, C. D., Tulloch, A. J. & Weaver, S. D. 2012. Second boiling effects on the Al-content of hornblende rims from an exhumed Cretaceous arc pluton, Stewart Island, New Zealand. American Mineralogist 97, 1129–44.Google Scholar
Turnbull, R., Weaver, S., Tulloch, A., Cole, J., Handler, M. & Ireland, T. 2010. Field and geochemical constraints on mafic-felsic interactions, and processes in high-level arc magma chambers: an example from the Halfmoon Pluton, New Zealand. Journal of Petrology 51, 1477–505.Google Scholar
Vernon, R. H. 1985. Possible role of superheated magma in the formation of orbicular granitoids. Geology 13, 843–5.Google Scholar
Watson, E. B. & Harrison, T. M. 1983. Zircon saturation revisited: temperature and composition effects in a variety of crustal magma types. Earth and Planetary Science Letters 64, 295–304.Google Scholar
Wiebe, R. A. 1993. The Pleasant Bay layered gabbro-diorite, Coastal Maine: ponding and crystallization of basaltic injections into a silicic magma chamber. Journal of Petrology 34, 461–89.Google Scholar
Wiebe, R. A. & Collins, W. J. 1998. Depositional features and stratigraphic sections in granitic plutons: implications for the emplacement and crystallisation of granitic magma. Journal of Structural Geology 20, 1273–89.Google Scholar
Wysoczanski, R. J. & Allibone, A. H. 2004. Age, correlation, and provenance of the Neoproterozoic Skelton Group, Antarctica: Grenville age detritus on the margin of East Antarctica. The Journal of Geology 112, 401–16.Google Scholar
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