Granite Pluton Geometry and Emplacement Mode Inferred from Combined Fabric and Gravity Data

Ameglio, L.; Vigneresse, Jean-Louis; Bouchez, Jean‐Luc

doi:10.1007/978-94-017-1717-5_13

Cited by 57 publications

(65 citation statements)

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“…The Águas Frias-Chaves pluton has a greater thickness (≈10 km) and belongs to the wedge-floored pluton type of Ameglio et al (1997). Nevertheless, these data didn't underline any differences in shape of the two granites from the Águas FriasChaves pluton.…”

Section: Gravimetrymentioning

confidence: 76%

“…Among the several possible inversion methods, our modelling was performed using the 3-D iterative procedure derived from Cordell and Henderson (1968) adapted to small-scale gravimetric investigations by Vigneresse (1990). In this process (Ameglio et al, 1997), the source was roughly modelled by small prisms each having a constant density and a progressive adjustment was performed until the calculated gravity field fitted the observed data. A map of surface densities for the main granite types of the two plutons and surrounding rocks, have been incorporated in the computation, in order to better constrain the nominal densities of the prisms.…”

Section: Gravimetrymentioning

confidence: 99%

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Genesis and emplacement of felsic Variscan plutons within a deep crustal lineation, the Penacova-Régua-Verín fault: An integrated geophysics and geochemical study (NW Iberian Peninsula)

Martins

Sant'Ovaia

Noronha

2009

Lithos

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Multidisciplinary studies integrating, U-Pb geochronology, whole-rock geochemical data, isotope geochemistry, anisotropy of magnetic susceptibility (AMS) studies and gravimetry were carried out on the Vila Pouca de Aguiar and the Águas Frias-Chaves porphyritic biotite granite plutons. Both plutons occur independently in a distance of about 20 km. The Vila Pouca de Aguiar and Águas Frias-Chaves plutons are examples of late to post-orogenic felsic Variscan granites in northern Portugal (NW Iberian Peninsula). The U-Pb zircon analyses yield a consistent age of 299 ± 3 Ma which is considered to be the emplacement age of the two plutons. These granites are weakly peraluminous, show high HREE and Y (and low P) contents which are consistent with them being I-type. This is also supported by their weakly evolved isotopic compositions, 87 Sr/ 86 Sr i = 0.7044-0.7077 and εNd = − 2.0 to − 2.6, as well as by the whole rock oxygen isotope (δ 18 O VSMOW) ranging from + 9.7‰ to + 11.0‰. The emplacement of granite magma took place after the third Variscan deformation phase (D 3 ) in an extensional tectonic regime, large scale uplift and crustal thinning. The integration of different data suggests that both plutons have the same feeding zone aligned within the Penacova-Régua-Verin fault (PRVF) and that both have the same structure which is related to late Variscan phases. The thicker shape for the Águas Frias-Chaves pluton comparing to that of the Vila Pouca de Aguiar pluton is compatible with different depths of PRVF sectors. The available data led us to propose a model of partial melting of a meta-igneous lower crustal source rather than an open-system of mantle-crust interaction. The interaction between the continental crust and invading mafic magmas could have been limited to mere heat transfer and, perhaps, local intermingling.

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Section: Gravimetrymentioning

confidence: 76%

Section: Gravimetrymentioning

confidence: 99%

Genesis and emplacement of felsic Variscan plutons within a deep crustal lineation, the Penacova-Régua-Verín fault: An integrated geophysics and geochemical study (NW Iberian Peninsula)

Martins

Sant'Ovaia

Noronha

2009

Lithos

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“…Densities of the different units of the study area were taken from previous works in nearby areas (Améglio et al 1997;Olivier and Améglio 2002;Talbot et al 2005b;Gébelin et al 2006) as well as some new density determinations. In order to constrain stochastic inversion, density distributions were expressed as mean density and standard deviation (Table 2).…”

Section: Gravity Inversionmentioning

confidence: 99%

“…In addition, the knowledge of the 3D shape of a pluton brings important information on the emplacement process, for example, by locating the possible feeder zones (Vigneresse 1990;Aranguren et al 1996;Améglio et al 1997;Joly et al 2008) and by defining the relationships between the host rocks and the granitic pluton. Several studies illustrate the usefulness of combining gravity and structural data when investigating the emplacement mode and structural evolution of a granitic pluton (e.g.…”

mentioning

confidence: 99%

“…Several studies illustrate the usefulness of combining gravity and structural data when investigating the emplacement mode and structural evolution of a granitic pluton (e.g. Améglio et al 1997;Vigneresse and Bouchez 1997;Talbot et al 2004). In order to obtain a consistent model, the 3D geological model is directly computed from the available structural data (field observations and AMS results) and constrained by geophysical data Joly et al 2008).…”

mentioning

confidence: 99%

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Gravity inversion, AMS and geochronological investigations of syntectonic granitic plutons in the southern part of the Variscan French Massif Central

Joly

Faure

Martelet

et al. 2009

Journal of Structural Geology

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Multiple Emplacement and Exhumation History of the Late Mesozoic Dayunshan‐Mufushan Batholith in Southeast China and Its Tectonic Significance: 2. Magnetic Fabrics and Gravity Survey

Chen

et al. 2018

JGR Solid Earth

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The Late Mesozoic magmatic province is a prominent feature of the South China Block (SCB). However, the tectonic regimes associated with the magmatism are still elusive. A combined anisotropy of magnetic susceptibility and gravity study has been carried out to determine the fabric patterns and shape at depth of the Dayunshan‐Mufushan composite batholith in the north‐central SCB. This is a companion paper to Part 1 that presented the structural and geochronological data of this batholith. The magnetic fabrics in the batholith interior predominantly reflect magma flow structures. Two distinct patterns of the magnetic lineations are defined, around NNE‐SSW and WNW‐ESE trends for the early‐stage and late‐stage intrusions of the batholith, respectively. The gravity survey reveals that the early‐stage intrusion has a main feeder zone located below its northern part, while several linear feeder zones trending NNE‐SSW are inferred for the late‐stage intrusion. Integrating all results, a two‐stage construction of the batholith with distinct tectonic regimes has been established. It is concluded that the early‐stage intrusion experienced a southward magma transport during its emplacement, partially assisted by far‐field compression from the north at ca. 150 Ma. Conversely, the emplacement and exhumation of the late‐stage intrusion was accommodated by a NW‐SE crustal stretching involving a lateral magma expansion above the multiple feeder zones (likely corresponding to extensional fractures) and ductile shearing during 132–95 Ma localized mainly along the Dayunshan detachment fault. Finally, we discuss the geodynamic linkage between the paleo‐Pacific subduction and the Late Mesozoic tectonomagmatism in the SCB.

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Granite Pluton Geometry and Emplacement Mode Inferred from Combined Fabric and Gravity Data

Cited by 57 publications

References 0 publications

Genesis and emplacement of felsic Variscan plutons within a deep crustal lineation, the Penacova-Régua-Verín fault: An integrated geophysics and geochemical study (NW Iberian Peninsula)

Genesis and emplacement of felsic Variscan plutons within a deep crustal lineation, the Penacova-Régua-Verín fault: An integrated geophysics and geochemical study (NW Iberian Peninsula)

Gravity inversion, AMS and geochronological investigations of syntectonic granitic plutons in the southern part of the Variscan French Massif Central

Multiple Emplacement and Exhumation History of the Late Mesozoic Dayunshan‐Mufushan Batholith in Southeast China and Its Tectonic Significance: 2. Magnetic Fabrics and Gravity Survey

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