Magmatic fabrics in batholiths as markers of regional strains and plate kinematics: example of the Cretaceous Mt. Stuart batholith

Benn, K.; Paterson, Scott R.; Lund, Steve P.; Pignotta, Geoffrey S.; Kruse, Sarah

doi:10.1016/s1464-1895(01)00064-3

Cited by 89 publications

(57 citation statements)

References 38 publications

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“…Magnetic lineations in granite plutons emplaced and magmatically deformed in folding metamorphic terrains have also been documented in at least three other well studied cases, in the Devonian Meguma Terrane, Canada (Benn et al 1997;Pignotta and Benn 1999), in the Cretaceous Mt. Stuart batholith, Washington state (Benn et al 2001) and in the Sveconorwegian granites of southern Norway (Bolle et al 2003). The Karlshamn pluton is another example illustrating that the magmatic fabrics in syntectonic plutons can be used as markers of synemplacement tectonic strain axes.…”

Section: Directional Datamentioning

confidence: 78%

Emplacement and deformation of the ca. 1.45 Ga Karlshamn granitoid pluton, southeastern Sweden, during ENE-WSW Danopolonian shortening

Cecys

Benn

2006

Int J Earth Sci (Geol Rundsch)

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Anisotropy of magnetic susceptibility and structural geology of the ca. 1.45 Ga Karlshamn pluton (southern Sweden) are used to study its emplacement and structural evolution. The Karlshamn pluton is one of the largest metaluminous A-type granitoid intrusions in southern Sweden. It is a multiphase body made up of two suites that differ in composition but which have similar crystallization ages. The magmatic foliation, ductile shear zones and granite-pegmatite filled fractures were mapped as well as the metamorphic foliation and extension lineation in the metamorphic host rocks. The anisotropy of magnetic susceptibility was used to map the magnetite petrofabric of the pluton, providing a larger data set for both the magmatic foliations and lineations, which could not be mapped in the field. The fabrics within the pluton are continuous with the metamorphic fabrics in the country rocks. Both the pluton and the country rock fabrics were folded during ENE-WSW compression, while the pluton was still a magma mush. The stress field orientation during cooling of the pluton is determined on the basis of magmatic, ductile and brittle structures in the Karlshamn pluton that formed successively as the pluton cooled. The compressional event is referred to as the Danopolonian orogeny and therefore the Karlshamn granitoids, and other plutons of similar composition and age in central and southern Sweden, on the Danish Island of Bornholm, and in Lithuania, may be considered as syntectonic intrusions and not as anorogenic, as was previously thought.

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Section: Directional Datamentioning

confidence: 78%

Emplacement and deformation of the ca. 1.45 Ga Karlshamn granitoid pluton, southeastern Sweden, during ENE-WSW Danopolonian shortening

Cecys

Benn

2006

Int J Earth Sci (Geol Rundsch)

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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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“…The magnetic fabric axes are parallel to the mineral fabric axes, and these axes record the strain field (flattening plane and stretching direction) to which the magma was subjected, either during its crystallization (magmatic microstructures) or immediately after (high-temperature solid-state microstructures) [40][41][42][43]. The microscopic study and field observation of the Boroujerd pluton show that there are continuities from magmatic to mylonitic deformations and associated fabrics.…”

Section: Microstructuresmentioning

confidence: 99%

A preliminary study of the anisotropy of magnetic susceptibility (AMS) of Boroujerd granitoids, Sanandaj-Sirjan Zone, West Iran

Rasouli¹,

Ahadnejad

Esmaeily³

2012

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The Boroujerd pluton (ca 175 Ma) was emplaced in the Sanandaj-Sirjan zone (SSZ) active margin of Central Iran consists of monzogranite, granodiorite, and quartz-diorite. Microstructural studies show a continuum from magmatic to (sub) mylonitic deformations fabric. Intensity of deformation decreases from W-NW to E-SE. The overall magnetic fabric of the pluton yields steep NW-SE striking foliations and sub-horizontal lineations plunging both to the northwest and southeast. These features imply that during intrusion of the pluton, a NW-SE trending stretching was dominant. This stretching is ascribed to the transpressive deformation of the overriding SSZ during northeastward subduction of the Neotethys under the Iranian plate. The NW-SE trending lineations of the Gousheh pluton (ca 35 Ma) suggest that the transpressive regime was ongoing from the Mesozoic to late Eocene.

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Magmatic fabrics in batholiths as markers of regional strains and plate kinematics: example of the Cretaceous Mt. Stuart batholith

Cited by 89 publications

References 38 publications

Emplacement and deformation of the ca. 1.45 Ga Karlshamn granitoid pluton, southeastern Sweden, during ENE-WSW Danopolonian shortening

Emplacement and deformation of the ca. 1.45 Ga Karlshamn granitoid pluton, southeastern Sweden, during ENE-WSW Danopolonian shortening

“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

A preliminary study of the anisotropy of magnetic susceptibility (AMS) of Boroujerd granitoids, Sanandaj-Sirjan Zone, West Iran

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