... and tectonic consequences refute all evidence for magmatism in the Transantarctic Mountains associated with the Precambrian "Beardmore orogeny," the age and status of which are now in doubt. Geological Society of America 1988 ...

...EDMUND STUMP; J. H. SMIT; STEPHEN SELF Abstract The Beardmore Orogeny previously has been designated for deformational and magmatic activity that occurred during the late Proterozoic in the central Transantarctic Mountains. It is recognized in folding of Beardmore Group turbidites, unconformably...

...–Cambrian rifting that predated the Ross orogeny. None of the gneissic granitoid plutons was emplaced during a Neoproterozoic Beardmore orogeny, as has been suggested by some previous workers. Emplacement of small plutons characterized by an “adakitic” chemistry, punctuated by folding events, continued...

.... Pankhurst R.J. Storey B.C. Millar I.L. Macdonald D.I.M. Vennum W.R. Cambrian-Ordovician magmatism in the Thiel Mountains, Transantarctic Mountains, and implications for the Beardmore orogeny Geology 1988 16 246 249 Powell C. McA LI Z.X. McElhinny M.W. Meert J.G...

... Cambrian. In most interpretations, the subsequent rock record of the Ross orogen is considered to reflect transition to an active continental margin with early phases of deformation being referred to a Proterozoic Beardmore orogeny ( Grindley & McDougall 1969). Although the nature and timing...

... Press , 284 p. Stump , E. , Smit , J.H. , and Self , S. , 1986 , Timing of events of the Late Proterozoic Beardmore orogeny, Antarctica: Evidence from the La Gorce Mountains : Geological Society of America Bulletin , 97 . 953 – 965 . Stump , E. , Miller , J.M.G...

.... ; Korsch , R. J. ; and Edgerton , D. G. 1991 . The myth of the Nimrod and Beardmore orogenies . In Thomson , M. R. A. , Crame , J. A. , and Thomson , J. W. , eds. Geological evolution of Antarctica . New York , Cambridge University Press , p. 143 – 147 . Stump , E...

... Mountains at least, the tectonic evolution of this margin is considered to have been dominated by two distinct orogenic events. The first event, referred to locally as the Beardmore or Nimrod orogenies ( Grindley and McDougall, 1969 ; Goodge et al., 1991 ; Storey et al., 1992 ), was interpreted as being...

... bimodal magmas geochemistry Liv Group rifting Ross orogeny Transantarctic Mountains The La Gorce Formation of the Beardmore Group is the oldest unit of the Ross orogen in the Queen Maud Mountains. It crops out on the cratonic, inboard side of the Queen Maud−Wisconsin Range batholith (part...

... . 284 p. Stump , E. , Korsch , R.J. , and Edgerton , D.G. , 1991 , The myth of the Nimrod and Beardmore orogenies : in Thomson , M.R.A. , Crame , J.A. , and Thomson , J.W. , eds., Geological evolution of Antarctica : New York , Cambridge University Press , p. 143...

... affinities are dated at 762 + 24 Ma (Borg et al. 1990). The most striking difference between the two margins lies in the degree of deformation. The Beardmore Group within the Transantarctic Mountains was folded during the late Precambrian Beardmore Orogeny and was unconfor- mably overlain by Cambrian...

... deformation traditionally considered to have been the result of the Late Neoproterozoic Beardmore orogeny and the Early Palaeozoic Ross orogeny ( Grindley & McDougall 1969 ; Gunn & Warren 1962 ; and latterly Stump 1995 ; Storey et al . 1996 ). However, recent improvements in geochronology...

... significance because it represents the youngest volcanic rock yet identified within the Ross orogen in Antarctica and provides important new evidence for latest Cambrian or younger deformation, possibly associated with orogenic collapse during slab rollback at the terminal stages of the Ross orogeny...

... referred to as the Nimrod and Beardmore orogenies ( Grindley and McDougall, 1969 ; Grindley, 1972 ) are now included in a broad cycle of Ross orogenesis ( Goodge et al., 1993 , 2002 ; Goodge, 2002 ). Goodge et al. (2004 , p. 1274, their fig. 13B) postulated a regionally extensive subduction-related...

... during the Nimrod Orogeny in the Transantarctic Mountains, Antarctica: implications for Proterozoic plate reconstructions . Precambrian Res. 112 : 261 – 288 . Goodge , J. W. ; Myrow , P. ; Williams , I. S. ; and Bowring , S. A. 2002 . Age and provenance of the Beardmore Group...

... crust subducting under southern Wabigoon subprovince. To the north of the subduction zone, subaerial, predominantly intermediate, calc-alkaline volcanism in the Onaman–Tashota terrane of Wabigoon subprovince appears to have formed the major source of detritus deposited in the Beardmore–Geraldton fore...

... in the Pensacola Mountains, Antarctica: the significance of the Ross Orogen Geological Society of America Bulletin 1996 108 685 707 Stump E. Smith J.H. Self S. Timing of events during the Late Proterozoic Beardmore orogeny, Antarctica: geological evidence from La Gorce Mountains...

... should have a record of the Cambrian–Ordovician orogeny that occurred along the paleo-Pacific margin of East Gondwana, known as the Ross/Delamerian orogeny ( Cawood, 2005 ). However, the Ellsworth-Whitmore Mountains lack evidence for this event, and deformation appears to be solely restricted to the Late...

... the Beardmore orogeny ( Grindley and McDougall, 1969 ), although Goodge (1997) questioned whether this event should be distinguished from the Ross orogeny, and suggested that it may form an early phase of deformation in an extended Ross orogeny. To avoid ambiguity, I use the term Beardmore folding event...

...., 1999 ). The collisional Dom Fe li ciano orogeny in southern Brazil (opposite the Damara orogen) lasted from 650 to 590 Ma ( Hartmann, 2002 ) and climaxed with 610–590 Ma potassic granites ( Hartmann et al., 2000 ) and metamorphic zircon ( Fig. 2 , M); crustal reworking terminated at 550 Ma ( Leite et...