Interference between pluton expansion and non-coaxial tectonic deformation: three-dimensional computer model and field implications

Guglielmo, Giovanni

doi:10.1016/0191-8141(93)90150-9

Cited by 27 publications

(8 citation statements)

References 34 publications

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“…The steeply plunging lineations mapped in the mylonitic rocks of the deformation aureole are attributed to a stretching associated with northeast–southwest shortening of the wall rocks by the spreading laccoliths, and concurrent northwest–southeast shortening related to regional tectonics. The computer modelling of Guglielmo (1993) predicts a similar strain pattern at the ends of syntectonically expanding plutons.…”

Section: Discussionmentioning

confidence: 76%

“…Some vertical displacements may have occurred by ductile flow in the deformation aureole, as indicated by the steeply plunging extension lineations. Taken alone, the structures in the deformation aureole could be compatible with ductile flow of the wall rocks along the margins of magma diapirs (Bateman 1984; Cruden 1988), or of in situ ballooning plutons (Guglielmo 1993). In the following sections we discuss evidence that the flattening and vertical flow in the deformation aureole more likely resulted from the lateral spreading of laccolithic intrusions, though lateral spreading was not the main space creation mechanism for magma emplacement.…”

Section: Deformation In the Country Rocksmentioning

confidence: 97%

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Geophysical and structural signatures of syntectonic batholith construction: the South Mountain Batholith, Meguma Terrane, Nova Scotia

Benn¹,

Roest

Rochette

et al. 1999

Geophysical Journal International

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The Late Devonian South Mountain Batholith is a very large (7000 km2) composite peraluminous granitoid complex situated within the Meguma Terrane of the northern Appalachians. It is made up of two suites of granodioritic to leucogranitic plutons emplaced at approximately 380–370 Ma during the Acadian Orogeny, i.e. during the collision of Gondwana with the eastern margin of North America. A significant geophysical and geological database makes the South Mountain Batholith a type example of a very large syntectonic batholith emplaced within a collisional orogen. Gravity models reveal the plutons have flat or gently dipping floors at approximately 7.0 km depth and aspect ratios >6:1. They are underlain by deeper (>10 km) elongate northeast–southwest‐trending roots that may indicate magma feeder zones. Dyke transport of granitic magma and the progressive construction of plutons by sheet injections are supported by field observations and by mapping of the anisotropy of magnetic susceptibility at the pluton scale. The very narrow deformation aureole within the country rocks suggests lateral spreading of the plutons was not the main space creation mechanism during emplacement; space was mostly created by vertical displacements of country rocks. The data are consistent with a laccolithic model for syntectonic batholith assembly. The laccolithic plutons may have been emplaced at the base of the Meguma Supergroup metasedimentary rocks, suggesting a maximum thickness of approximately 7.0 km for the supracrustal rocks in the Meguma Terrane.

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Section: Discussionmentioning

confidence: 76%

Section: Deformation In the Country Rocksmentioning

confidence: 97%

Geophysical and structural signatures of syntectonic batholith construction: the South Mountain Batholith, Meguma Terrane, Nova Scotia

Benn¹,

Roest

Rochette

et al. 1999

Geophysical Journal International

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“…The fact that the host-rock foliation appears to "wrap around" the pluton, and fold axes in the host rock at pluton sides are parallel to lineations within Bonney Pluton, suggests coeval deformation and intrusion (Castro 1987;Guglielmo 1993Guglielmo ,1994. Host-rock lineations are also parallel to the sides and elongation direction of the pluton.…”

Section: Structural Interpretationmentioning

confidence: 85%

Contrasting structural styles during polyphase granitoid intrusion, South Victoria Land, Antarctica

Jones

1997

New Zealand Journal of Geology and Geophysics

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“…Hutton & Reavy 1992, Scott et al 1993), but problems may arise in determining exact age relationships between various phases of intrusion and deformation (eg. Paterson & Tobisch 1988, Guglielmo 1993.…”

Section: Introductionmentioning

confidence: 99%

Timing of Palaeoproterozoic crustal shearing in the central Fennoscandian Shield according to U-Pb data from associated granitoids, Finland

Vaasjoki¹,

Kärki²,

Laajoki³

2001

Bull Geol Soc Finland

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Granitoids in the Finnish part of the Fennoscandian Shield were created by numerous Archaean and Palaeoproterozoic tectonic events. Late phases of Palaeoproterozoic, Svecokarelian deformation created ductile, crustal-scale shear zones, of which the N-S striking Hirvaskoski Shear Zone and the NE-SW striking Oulujärvi Shear Zone were strongly affected by the latest deformation stages, D 3 and D 4 . These shear tectonic events deformed ductilely prekinematic granitoids and caused intrusion of synkinematic igneous rocks, but the D 3 and D 4 fault rocks are also penetrated by postkinematic intrusives.Archaean granitoids behaved mostly as rigid blocks unaffected by Palaeoproterozoic deformation. However, inherited Archaean zircons occur in some obviously Proterozoic granitoids, and others contain heterogeneous zircon populations. Granitoids lacking structures of the earliest deformations, D 1 and D 2 , contain inherited zircon populations partially reset during the Svecokarelian orogeny and have been sheared ductilely during stages D 3 and D 4 . Granitic rocks yielding zircon ages of 1.82-1.80 Ga show no features associated with these shearing events and penetrate the D 4 fault rocks setting a minimum age for these deformation events. This age marks also the end of convergent tectonics in the central Fennoscandian Shield. Monazite data from a variety of rocks demonstrates a regional cooling below the 600°C isotherm at 1.8 Ga.

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Interference between pluton expansion and non-coaxial tectonic deformation: three-dimensional computer model and field implications

Cited by 27 publications

References 34 publications

Geophysical and structural signatures of syntectonic batholith construction: the South Mountain Batholith, Meguma Terrane, Nova Scotia

Geophysical and structural signatures of syntectonic batholith construction: the South Mountain Batholith, Meguma Terrane, Nova Scotia

Contrasting structural styles during polyphase granitoid intrusion, South Victoria Land, Antarctica

Timing of Palaeoproterozoic crustal shearing in the central Fennoscandian Shield according to U-Pb data from associated granitoids, Finland

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