A record of crustal-scale stress; igneous foliation and lineation in the Mount Waldo Pluton, Waldo County, Maine

Callahan, Caitlin N.; Markley, Michelle

doi:10.1016/s0191-8141(02)00052-4

Cited by 18 publications

(12 citation statements)

References 20 publications

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“…6), but is sub-parallel both to the pluton/ host rock contacts and *NE-SW elongation of the pluton. As a possible explanation, we suggests that the steep *NE-SW magmatic foliation may reflect the strain associated with laminar magma flow through a steep-sided, *NE-SW elongated conduit that was under far-field regional stress during emplacement and crystallization (see Callahan and Markley 2003 for a similar example). Interestingly, the steep magmatic foliation changes abruptly, or in some places gradually, into the flat-lying to gently dipping foliation (Figs.…”

Section: Discussionmentioning

confidence: 95%

Magmatic history and geophysical signature of a post-collisional intrusive center emplaced near a crustal-scale shear zone: the Plechý granite pluton (Moldanubian batholith, Bohemian Massif)

Verner

Žák

Pertoldová

et al. 2007

Int J Earth Sci (Geol Rundsch)

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The Plechý pluton, southwestern Bohemian Massif, represents a late-Variscan, complexly zoned intrusive center emplaced near the crustal-scale Pfahl shear zone; the pluton thus provides an opportunity to examine the interplay among successive emplacement of large magma batches, magmatic fabric acquisition, and the late-Variscan stress field associated with strike-slip shearing. The magmatic history of the pluton started with the emplacement of the porphyritic Plechý and Haidmühler granites. Based on gravity and structural data, we interpret that the Plechý and Haidmühler granites were emplaced as a deeply rooted, *NE-SW elongated body; its gross shape and internal fabric (steep *NE-SW magmatic foliation) may have been controlled by the late-Variscan stress field. The steep magmatic foliation changes into flat-lying foliation (particularly recorded by AMS) presumably as a result of divergent flow. Magnetic lineations correspond to a sub-horizontal *NE-SW finite stretch associated with the divergent flow. Subsequently, the Třístoličník granite, characterized by steep margin-parallel magmatic foliation, was emplaced as a crescent-shaped body in the central part of the pluton. The otherwise inward-younging intrusive sequence was completed by the emplacement of the outermost and the most evolved garnet-bearing granite (the Marginal granite) along the southeastern margin of the pluton.

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Section: Discussionmentioning

confidence: 95%

Magmatic history and geophysical signature of a post-collisional intrusive center emplaced near a crustal-scale shear zone: the Plechý granite pluton (Moldanubian batholith, Bohemian Massif)

Verner

Žák

Pertoldová

et al. 2007

Int J Earth Sci (Geol Rundsch)

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“…(1998) as strongly resembling S-C structures on a kilometer-scale and were interpreted as being caused by regional shearing. 11icro-scale magmatic S-C fabrics have been found related to deformation during the magmatic stage (Biswal et aI., 2004) or flow along dikes (Callot and Guichet, 2003) and many pluton emplacements are related to strike-slip faults or ductile shear deformation bands (Spannera and Kruhl, 2002;Callahan and Markley, 2003;Chardon, 2003 among others).…”

Section: Discussionmentioning

confidence: 99%

Magma emplacement in transpression: The Santa Olalla Igneous Complex (Ossa-Morena Zone, SW Iberia)

Romeo

Capote

Tejero

et al. 2006

Journal of Structural Geology

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The Santa Olalla Igneous Complex, a late-Variscan group of intrusions located in the Ossa-Morena Zone (SW Iberia), has been the focus of a gravity and structural study. The structure outlined by the foliation map is complex, showing two different structural domains: one character ized by vertical, and the other by horizontal, magmatic foliations. The vertical fabrics are restricted to the NE half of the complex, which is in direct contact with a Variscan sinistral strike-slip fault (Cherneca fault) whereas the horizontal fabrics are developed in the SW half of the com plex, which is characterized by a horizontal tabular geometry. Gravity modeling indicates that the deeper floor of the plutons is closely related to the NE margin and the Cherneca fault. An emplacement and structural evolution model for this igneous complex is proposed following these structural and gravity results: (1) magma ascent was favored by releasing bends in the trace of the Cherneca fault; (2) when magma reached the present level it intruded to the SW with a horizontal sheet geometry generating the subhorizontal foliation domain; (3) after emplacement, the NE half of the complex suffered the external tectonic stress field provoked by sinistral motion along the Cherneca fault, subsequently generating the subvertical magmatic foliation domain.

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“…For example, recent studies indicate that magmatic fabrics in plutons form in rheologically complex crystal-rich mushes, and reflect strain from a wide variety of processes including regional tectonic deformation (possibly unrelated to magma flow, emplacement, and shape of the pluton; e.g., Benn et al 2001;Callahan and Markley 2003;Paterson et al 1998Paterson et al , 2003). Moreover, two or more different subfabrics (multiple particle orientations resulting from a single process) may develop in a heterogeneous particle population during magmatic flow (e.g., Arbaret et al 2001;Ildefonse and Mancktelow 1993;Ildefonse et al 1992aIldefonse et al , b, 1997Ježek et al 1994Ježek et al , 1996Ježek et al , 1999Schulmann et al 1997), making it difficult to relate the bulk rock fabric or its components to the fracture orientation.…”

Section: Introductionmentioning

confidence: 99%

“Granite tectonics” revisited: insights from comparison of K-feldspar shape-fabric, anisotropy of magnetic susceptibility (AMS), and brittle fractures in the Jizera granite, Bohemian Massif

Žák

Verner

Klomínský

et al. 2008

Int J Earth Sci (Geol Rundsch)

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In the Jizera granite of the Krkonoše-Jizera Plutonic Complex, northern Bohemian Massif, contrasting patterns of magmatic K-feldspar fabrics and brittle fractures characterize different structural levels of the pluton. The uppermost exposed level at *800-1,100 m above sea level is dominated by flat foliation that overprints two steep foliations. In contrast, K-feldspar shape-fabric in an underground tunnel (*660 m above sea level) shows complex variations in orientation and intensity. Magnetic fabric carried by coaxial contributions of biotite, magnetite, and maghemite is homogeneous along the examined section of the tunnel, and is decoupled from the K-feldspar fabric. The Jizera granite is crosscut by two regional sets of subvertical fractures (*NE-SW and *NW-SE) and by near-surface exfoliation joints. The multiple fabrics are inferred to reflect a complex magmatic strain history at different structural levels of the pluton, bearing little or no relationship to the fracture network. In contrast to the original concept of Hans Cloos (''granite tectonics''), we conclude that no simple genetic relationship exists between fabrics and fractures in plutons. An alternative classification of fractures in plutons thus should avoid relationships to magmatic fabrics and should instead consist of cooling, syntectonic, uplift, and post-uplift fractures.

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A record of crustal-scale stress; igneous foliation and lineation in the Mount Waldo Pluton, Waldo County, Maine

Cited by 18 publications

References 20 publications

Magmatic history and geophysical signature of a post-collisional intrusive center emplaced near a crustal-scale shear zone: the Plechý granite pluton (Moldanubian batholith, Bohemian Massif)

Magmatic history and geophysical signature of a post-collisional intrusive center emplaced near a crustal-scale shear zone: the Plechý granite pluton (Moldanubian batholith, Bohemian Massif)

Magma emplacement in transpression: The Santa Olalla Igneous Complex (Ossa-Morena Zone, SW Iberia)

“Granite tectonics” revisited: insights from comparison of K-feldspar shape-fabric, anisotropy of magnetic susceptibility (AMS), and brittle fractures in the Jizera granite, Bohemian Massif

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