Dr George Williams
|Org Unit||Earth Sciences|
|Telephone||+61 8 8313 5843|
George E. Williams BSc MSc (Melb) PhD DSc (Reading), FAA FGSAm FGSAust
1963: The Geology and Structure of the Kinglake District, Central Victoria. MSc thesis, Department of Geology, University of Melbourne, 170 pp.
1966: The Precambrian Torridonian Sediments of the Cape Wrath District, Northwest Scotland. PhD thesis, Sedimentology Research Laboratory, University of Reading, 324 pp.
1851 Exhibition Overseas Scholarship, held at the Sedimentology Research Laboratory, University of Reading, 1963-1966.
Queen Elizabeth II Research Fellowship, Department of Geology, University of Adelaide, 1968-1970.
Elected a Fellow of the Geological Society of America, 1979.
The International Astronomical Union gave the name 'Geowilliams' to Asteroid 1984 UL2 in 1988, in recognition of my discovery of the 90 km diameter Acraman impact structure in South Australia http://www.passc.net/EarthImpactDatabase/acraman.html
Awarded the Royal Society of Victoria Research Medal in 1991 for research in the Earth sciences in Australia during the previous six years.
ARC Australian Senior/Professorial Research Fellowships, Department of Geology and Geophysics, University of Adelaide, 1994-1998 and 1999-2003.
Elected a Fellow of the Geological Society of Australia, 1997.
Received the degree of DSc from the University of Reading in 1998, for published contributions to the Earth sciences.
Elected a Fellow of the Australian Academy of Science, 2011.
Research interests involve sedimentology, palaeomagnetism (with Dr Phil Schmidt, MagneticEarth; formerly Chief Research Scientist in geophysics, CSIRO), palaeoclimatology, and meteoritics. Current work includes the palaeogeography and palaeomagnetism of Proterozoic glacial deposits and red beds; the climate system on the Precambrian Earth; dynamics of the Precambrian Earth-Moon system; the geology and geophysics of the Ediacaran Acraman asteroid impact structure, South Australia; Torridonian (early Neoproterozoic) palaeogeography and basin analysis, NW Scotland; palaeomagnetic dating of Cenozoic ferruginous weathering in Australia.
SELECTED PUBLICATIONS SINCE 1995
* = link to a pdf file at end of entry.
PROTEROZOIC GLACIATION, SEDIMENTATION, PALAEOMAGNETISMWilliams, G.E., Schmidt, P.W. & Young, G.M. 2016. Strongly seasonal Proterozoic glacial climate in low palaeolatitudes: Radically different climate system on the pre-Ediacaran Earth. Geoscience Frontiers, 7, 555-571 (open access http://dx.doi.org/10.1016/j.gsf.2016.01.005).
Williams, G.E. 2008. Proterozoic (pre-Ediacaran) glaciation and the high obliquity, low-latitude ice, strong seasonality (HOLIST) hypothesis: principles and tests. Earth-Science Reviews, 87, 61-93.
*Williams, G.E. 2005. Subglacial meltwater channels and glaciofluvial deposits in the Kimberley Basin, Western Australia: 1.8 Ga low-latitude glaciation coeval with continental assembly. Journal of the Geological Society, London, 162, 111-124.
Williams, G. 2004. Late Palaeoproterozoic glaciation in the Kimberley region, WA. TAG (The Australian Geologist), 133, 15-17.
*Williams, G.E. & Schmidt, P.W. 2004. Neoproterozoic glaciation: reconciling low paleolatitudes and the geologic record. In: The Extreme Proterozoic: Geology, Geochemistry and Climate. American Geophysical Union, Geophysical Monograph, 146, 145-159.
Williams, G.E. 2004. The paradox of Proterozoic glaciomarine deposition, open seas and strong seasonality near the palaeoequator: global implications. In: Eriksson, P.G. et al. (Editors), The Precambrian Earth: Tempos and Events. Developments in Precambrian Geology, 12, pp. 448–459. Elsevier, Amsterdam.
Williams, G. & Schmidt, P. 2000. Proterozoic equatorial glaciation: Has ‘snowball Earth’ a snowball’s chance?. TAG (The Australian Geologist), 117, 21–25.
Schmidt, P.W. & Williams, G.E. 1999. Paleomagnetism of the Paleoproterozoic hematitic breccia and paleosol at Ville-Marie, Québec: further evidence for the low paleolatitude of Huronian glaciation. Earth and Planetary Science Letters, 172, 273–285.
Williams, G.E. 1998. Late Neoproterozoic periglacial aeolian sand sheet, Stuart Shelf, South Australia. Australian Journal of Earth Sciences, 45, 733–741.
Williams, G.E. & Schmidt, P.W. 1997. Paleomagnetism of the Paleoproterozoic Gowganda and Lorrain formations, Ontario: low paleolatitude for Huronian glaciation. Earth and Planetary Science Letters, 153, 157-169.
Williams, G.E. 1996. Soft-sediment deformation structures from the Marinoan glacial succession, Adelaide foldbelt: implications for the palaeolatitude of late Neoproterozoic glaciation. Sedimentary Geology, 106, 165–176.
Schmidt, P.W. & Williams, G.E. 1995. The Neoproterozoic climatic paradox: Equatorial palaeolatitude for Marinoan glaciation near sea level in South Australia. Earth and Planetary Science Letters, 134, 107-124.
METEORITICS: ACRAMAN ASTEROID IMPACT & AUSTRALITE STRATIGRAPHY
Williams, G. & Schmidt, P. 2015. Age of the Acraman impact - the case for drilling. TAG (The Australian Geologist), 174, 37-39.
Williams, G.E., Gostin, V.A. & Prescott, J.R. 2013. Stratigraphy and optical dating of Pleistocene coastal deposits in the Port Campbell australite strewn field, SW Victoria. Australian Journal of Earth Sciences, 60, 463-474. http://dx.doi.org/10.1080/08120099.2013.795501
Williams, G.E. & Gostin, V.A. 2010. Geomorphology of the Acraman impact structure, Gawler Ranges, South Australia. Cadernos Laboratorio Xeoloxico de Laxe, 35, 209-220.
Williams, G.E. & Gostin, V.A. 2005. Acraman-Bunyeroo impact event (Ediacaran), South Australia, and environmental consequences: twenty-five years on. Australian Journal of Earth Sciences, 52, 607-620.
*Williams, G.E. & Wallace, M.W. 2003. The Acraman asteroid impact, South Australia: magnitude and implications for the late Vendian environment. Journal of the Geological Society, London, 160, 545-554.
Williams, G.E., Schmidt, P.W. & Boyd, D.M. 1996. Magnetic signature and morphology of the Acraman impact structure, South Australia. AGSO Journal of Australian Geology and Geophysics, 16, 431–442.
Schmidt, P.W. & Williams, G.E. 1996. Palaeomagnetism of the ejecta-bearing Bunyeroo Formation, late Neoproterozoic, Adelaide foldbelt, and the age of the Acraman impact. Earth and Planetary Science Letters, 144, 347-358.
TORRIDONIAN (PROTEROZOIC) OF NW SCOTLAND
Williams, G.E. 2015. Hydrothermal alteration of Britain's oldest palaeosols: saddle dolomite and smectite at the Lewisian-Torridon Group (early Neoproterozoic) unconformity, NW Scotland. Scottish Journal of Geology, 51, 63-68. doi:10.1144/sjg2014-014
Williams, G.E. & Foden, J., 2012. Reply: A unifying model for the Torridon Group (early Neoproterozoic), NW Scotland: product of post-Grenvillian extensional collapse. Earth-Science Reviews, 111, 86-89.
Williams, G.E. & Foden, J. 2011. A unifying model for the Torridon Group (early Neoproterozoic), NW Scotland: product of post-Grenvillian extensional collapse. Earth-Science Reviews, 108, 34-49.
Williams, G.E. 2001. Neoproterozoic (Torridonian) alluvial fan succession, northwest Scotland, and its tectonic setting and provenance. Geological Magazine, 138, 471-494.
Williams, G.E. & Schmidt, P.W. 1997. Palaeomagnetic dating of sub-Torridon Group weathering profiles, NW Scotland: verification of Neoproterozoic palaeosols. Journal of the Geological Society, London, 154, 987-997.
DYNAMICS OF PROTEROZOIC EARTH-MOON SYSTEM
Williams, G.E., Jenkins, R.J.F. & Walter, M.R. 2007. No heliotropism in Neoproterozoic columnar stromatolite growth, Amadeus Basin, central Australia: geophysical implications. Palaeogeography, Palaeoclimatology, Palaeoecology, 249, 80-89.
Williams, G.E. 2004. Earth’s Precambrian rotation and the evolving lunar orbit: implications of tidal rhythmite data for palaeogeophysics. In: Eriksson, P.G. et al. (Editors), The Precambrian Earth: Tempos and Events. Developments in Precambrian Geology, 12, pp. 473–482. Elsevier, Amsterdam.
Williams, G.E. 2000. Geological constraints on the Precambrian history of Earth's rotation and the Moon's orbit. Reviews of Geophysics, 38, 37-59.
*Williams, G.E. 1998. Precambrian tidal and glacial clastic deposits: implications for Precambrian Earth-Moon dynamics and palaeoclimate. Sedimentary Geology, 120, 55-74.
Williams, G.E. 1997. Precambrian length of day and the validity of tidal rhythmite paleotidal values. Geophysical Research Letters, 24, 421–424.
PALAEOMAGNETISM OF PROTEROZOIC IRON-FORMATIONS, CANADA & AUSTRALIA
Williams, G.E. & Schmidt, P.W. 2004. Paleomagnetism of the 1.88-Ga Sokoman Formation in the Schefferville-Knob Lake area, Quebec, Canada, and implications for the genesis of iron oxide deposits in the central New Quebec Orogen. Precambrian Research, 128, 167-188.
Williams, G.E., Schmidt, P.W. & Clark, D.A. 2004. Palaeomagnetism of iron-formation from the late Palaeoproterozoic Frere Formation, Earaheedy Basin, Western Australia: palaeogeographic and tectonic implications. Precambrian Research, 128, 367-383.
Schmidt, P.W. & Williams, G.E. 2003. Reversal asymmetry in Mesoproterozoic overprinting of the 1.88-Ga Gunflint Formation, Ontario, Canada: non-dipole effects or apparent polar wander? Tectonophysics, 377, 7-32.
PROTEROZOIC TECTONICS, AUSTRALIA
Schmidt, P.W., Williams, G.E., Camacho, A. & Lee, J.K.W. 2006. Assembly of Proterozoic Australia: implications of a revised pole for the ~1070 Ma Alcurra Dyke Swarm, central Australia. Geophysical Journal International, 167, 626-634.
Williams, G.E. & Gostin, V.A. 2000. Mantle plume uplift in the sedimentary record: origin of kilometre-deep canyons within late Neoproterozoic successions, South Australia. Journal of the Geological Society, London, 157, 759-768.
PROTEROZOIC OF INDIA
Williams, G.E. & Schmidt, P.W. 2003. Possible fossil impression in sandstone from the late Palaeoproterozoic–early Mesoproterozoic Semri Group (lower Vindhyan Supergroup), central India. Alcheringa, 27, 75–76.
Williams, G.E. & Schmidt, P.W. 1996. Origin and palaeomagnetism of the Mesoproterozoic Gangau tilloid (basal Vindhyan Supergroup), central India. Precambrian Research, 79, 307-325.
PALAEOMAGNETIC DATING OF AUSTRALIAN REGOLITH
Schmidt, P.W. & Williams, G.E. 2017. Paleomagnetic age of ferruginous weathering beneath the Hamersley Surface, Western Australia, and the Cenozoic apparent polar wander path. Australian Journal of Earth Sciences, 64, 239-249.
Schmidt, P.W. & Williams, G.E. 2002. Palaeomagnetic dating of the Hamersley Surface and deep weathering in the Pilbara-northern Yilgarn region, WA. 16th Australian Geological Convention, July 2002. Geological Society of Australia Abstracts, 67, 431.
THE MT DISAPPOINTMENT PLUTON, CENTRAL VICTORIA
Comment by G.E. Williams on ‘Anatomy, emplacement and evolution of a shallow-level, post-tectonic laccolith: the Mt Disappointment pluton, SE Australia’ (J.D. Clemens & K. Benn, Journal of the Geological Society of London, vol. 167, p. 915–941).
The study by Clemens & Benn (2010) of the Late Devonian Mt Disappointment pluton in the Melbourne Zone of central Victoria provides much detailed information on the petrology and geochemistry of the pluton and a model for its emplacement. However, several of their claims require comment.
Certain major features of the Mt Disappointment pluton have long been recognised. In 1961–62 I mapped the pluton and the surrounding Late Silurian–Early Devonian marine deposits, identifying the non-megacrystic outer unit of the pluton, the megacrystic inner unit with locally flow-aligned K-feldspar megacrysts, and the pluton’s fault-bounded SE margin, and investigated the petrography and major-element geochemistry of both units (Williams 1963, 1964). That work is the basis for the maps of the pluton shown by Clemens & Benn (2010).
Clemens & Benn (2010) suggested that any differentiation processes within the magma were relatively restricted, stating (p. 924) that ‘there appear to be no aplites or pegmatites present in the pluton’. In fact, narrow dykes of aplite and pegmatite are present in both units and are numerous at Nimmo Falls near the eastern margin of the pluton. They consist mostly of quartz and K-feldspar commonly with granophyric texture, as well as oligoclase, albite and muscovite, with rare biotite, tourmaline and zircon. Apophyses extend from the pluton in the SW but were difficult to map accurately because of the dense forest cover.
Enclaves are rare in the non-megacrystic unit but fairly common in the megacrystic unit. Typically they show microgranular texture and comprise mostly biotite, oligoclase, quartz and K-feldspar; a rare variety contains abundant green hornblende. Rounded zircons were separated from two enclaves from the megacrystic unit, suggesting that many of the enclaves originated as sedimentary rocks.
Clemens & Benn (2010, p. 918) are incorrect in stating that more than 50 m from the contact with the pluton ‘the effects of contact metamorphism are no longer apparent in outcrop.’ Argillaceous rocks of the Melbourne Formation and Humevale Siltstone around the pluton (VandenBerg et al. 2000) commonly display small (0.5 mm) spots up to 1 km from the contact, and such effects of contact metamorphism are evident more than 2 km from the arcuate NE margin of the pluton (Williams 1964). The latter observation implies a very gently dipping pluton–country rock contact in that area, which is consistent with the shallow dip angles of the NE contact deduced by Clemens & Benn (2010).
The axial-surface traces of some folds may have been slightly affected during emplacement of the pluton, as suggested by Clemens & Benn (2010). However, the arcuate traces of folds adjacent to the pluton are part of a regional arcuate fold pattern spanning the width of the Melbourne Zone (Williams 1963, 1964; VandenBerg et al. 2000).
Clemens, J.D. & Benn, K. 2010. Anatomy, emplacement and evolution of a shallow-level, post-tectonic laccolith: the Mt Disappointment pluton, SE Australia. Journal of the Geological Society, London, 167, 915–941.
VandenBerg, A.H.M. et al. 2000. The Tasman Fold Belt System in Victoria. Geological Survey of Victoria Special Publication.
Williams, G.E. 1963. The Geology and Structure of the Kinglake District, Central Victoria. MSc thesis, University of Melbourne.
Williams, G.E. 1964. The geology of the Kinglake district, central Victoria. Proceedings of the Royal Society of Victoria, 77, 273–327.
To link to this page, please use the following URL: http://www.adelaide.edu.au/directory/george.williams