Fracturing and diking in incompletely crystallized granitic plutons

Hibbard, M. J.; Watters, Robert J.

doi:10.1016/0024-4937(85)90002-7

Cited by 69 publications

(22 citation statements)

References 32 publications

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“…Microstructural criteria for the identification of deformation in the presence of melt have been discussed by many authors (Hibbard and Watters 1985;Gapais and Barbarin 1986;Hibbard 1987;Blumenfeld and Bouchez 1988;Hutton 1988;Paterson et al 1989;Nicolas 1992;Tribe and D'Lemos 1996;Paterson et al 1998;Sawyer 1999). These authors tentatively correlate specific microstructures and deformation mechanisms with specific ranges of melt fractions.…”

Section: Criteria For the Identification Of Synmagmatic Deformation Imentioning

confidence: 96%

“…Many authors (Paquet et al 1981;Hibbard and Watters 1985;Gapais and Barbarin 1986;Hibbard 1987;Bouchez et al 1992;Davidson et al 1996) described microstructural evidence for grain-scale intragranular fracturing in the presence of melt. This interpretation rests on the occurrence of fractures filled by at least one phase that is inferred to crystallize from a residual melt (Fig.…”

Section: Fracturingmentioning

confidence: 98%

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Deformation of partially molten granite: a review and comparison of experimental and natural case studies

Rosenberg

2001

Int J Earth Sci

108

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Section: Criteria For the Identification Of Synmagmatic Deformation Imentioning

confidence: 96%

Section: Fracturingmentioning

confidence: 98%

Deformation of partially molten granite: a review and comparison of experimental and natural case studies

Rosenberg

2001

Int J Earth Sci

108

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“…As discussed above, plagioclase phenocrysts from individual intermediate rocks have a range of core compositions and zoning histories suggesting different origins and supporting a mixing process (e.g., Bell, 1983;Hibbard and Watters, 1985). The discontinuous nature of plagioclase zoning and irregular shapes of the cores imply resorption and a secondary origin of the rims; this suggests that some phenocrysts in the mixed rocks originated in the andesite, while others were present in the granite at the time of intrusion.…”

Section: Textural and Chemical Evidence For Magma Mixingmentioning

confidence: 93%

“…In granodiorite dike rocks, mixing of a hotter mafic magma with cooler felsic magma has caused rapid crystallization of relatively calcic plagioclase. This calcic plagioclase occurs as many small crystals and as calcic growth zones ("mega-oscillations" of Hibbard and Watters, 1985) on more sodic plagioclase present at the time of mixing. An example of this is plagioclase phenocrysts from a granodiorite dike with cores of An3o, a zone of Ango, and a rim of An25.…”

Section: Textural and Chemical Evidence For Magma Mixingmentioning

confidence: 99%

Chapter 20: Magma mixing and mingling between synplutonic mafic dikes and granite in the Idaho-Bitterroot batholith

Foster

Hyndman

1990

Geological Society of America Memoirs

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Intruded into the granites of the Idaho-Bitterroot batholith is a suite of mafic rocks dominated by basaltic andesite to dacite dikes, but also including angular to rounded andesite inclusions and quartz diorite complexes. Mutually intrusive relations suggest that these rocks were intruded while the granite was still partially fluid and thus are synplutonic. Magma interactions between the mafic and felsic rocks can be divided into three broad groups: magma mingling, magma mixing, and mingling combined with mixing. Magma mingling was important in composite dikes that contain andesite masses surrounded and cut by leucogranite veins and pods. Mixing below the present level of exposure resulted in hybrid dike rocks with disequilibrium phenocrysts. Mingling combined with mixing produced quartz diorite complexes that contain mafic, felsic, and hybrid rocks complexly swirled together. Mixing has resulted in the production of hybrid rocks that plot between end members of basaltic andesite and granite on Harker diagrams. The dominance of dikes over inclusions suggests that the mafic magma was intruded late in the crystallization history of the granite and/or that the granites were quite viscous throughout their history.

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“…campo es posible señalar una secuencia de intrusiviFinalmente, la secuencia intrusiva se completa dad entre ambos grupos de cuerpos básicos: los con las fases póstumas de la intrusión ígnea, dando cuerpos irregulares intruirían en una primera etapa, lugar al emplazamiento de pequeños cuerpos irregucon el granito aún no consolidado y los diques lo lares (de 10 m 2 ) y diques de hasta 40 cm de aplitas harían con posterioridad, en un encajante totalmente y pegmatitas que se reconocen, en el extremo sepcristalizado (Hibbard y Watters, 1987).…”

Section: Basamento íGneo-metamórficounclassified

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Lopez¹

1998

Estud. geol.

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La Sierra de Copacabana es una unidad orográfica emplazada en el ambiente de Sierras Pampeanas Noroccidentales, al E del Sistema de Famatina. Tanto su basamento, compuesto por rocas metamórficas de grado medio formadas durante el ciclo Pampeano, como los granitoides de carácter calcoalcalino y peralumínico que intruyen en un margen continental activo durante el Ciclo Famatiniano (Paleozoico inferior), fueron afectados por procesos deformativos que habrían producido las rocas típicas del metamorfismo dinámico (cataclasitas, protomilonitas, ortomilonitas y ultramilonitas) reconocidas en amplios sectores de la Sierra de Copacabana y en las serranías vecinas, durante el Ordovícico-Silúrico superior.El estudio estructural permitió definir este proceso deformativo que habría ocasionado una tectónica compresiva de carácter inverso hacia el oeste, relacionado con la colisión continente-continente durante la Orogenia Oclóyica (Ordovícico superior-Silúrico).Palabras clave: Gondwana, Sierra de Copacabana, Catamarca, Argentina. ABSTRACTCopacabana Range is an orographic unit of the Sistema de Famatina at the W of Sierras. Both the pampean metamorphic basament and the granitoids emplaced in a continental margin during the Famatinian Cycle were affected during the upper OrdovicicSiluric by a deformative regime that could has produced typical rocks deformed by dynamic metamorphism (cataclasites, protomylonites, ortomylonites and ultramylonites).The structural study allowed us to interpret that the deformative regime could has occasioned a compressive tectonic toward the west, associated with a continental collision during the Ocloyic orogenic.

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Fracturing and diking in incompletely crystallized granitic plutons

Cited by 69 publications

References 32 publications

Deformation of partially molten granite: a review and comparison of experimental and natural case studies

Deformation of partially molten granite: a review and comparison of experimental and natural case studies

Chapter 20: Magma mixing and mingling between synplutonic mafic dikes and granite in the Idaho-Bitterroot batholith

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