Does tectonic deformation control episodic continental arc magmatism? Evidence from granitic magnetic fabrics (AMS)

Burton‐Johnson, Alex; Riley, Teal R.; Harrison, R. J.; Niocaill, Conall Mac; Muraszko, Joy R.; Rowley, Peter D.

doi:10.1016/j.gr.2022.09.006

Cited by 10 publications

(10 citation statements)

References 154 publications

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“…The above inferences provide an alternative hypothesis to that proposed recently by Burton‐Johnson et al. (2022). In their model, a switch of lineations from vertical to horizontal was explained as a result of increasing vertical load over a reduced component of horizontal compressive stress.…”

Section: Discussionsupporting

confidence: 52%

“…The above inferences provide an alternative hypothesis to that proposed recently by Burton-Johnson et al (2022).…”

Section: Farallon Plate Kinematics Recorded In the Pluton Fabricssupporting

confidence: 47%

“…The models for its emplacement and magmatic evolution are hotly debated and vary considerably, essentially between short‐lived chamber(s) assembled via dikes/sills and long‐lived chamber(s) assembled via multiple large magma batches (Bartley et al., 2008, 2018; Chambers et al., 2020; Coleman et al., 2004, 2012; Glazner et al., 2004; Memeti et al., 2010; Paterson & Vernon, 1995; Paterson et al., 2016; Žák & Paterson, 2005; Žák et al., 2009). Yet, the significance of its synmagmatic deformation is not fully understood, especially in its relation to past plate motions (Ardill, Paterson, et al., 2020; Attia et al., 2022; Burton‐Johnson et al., 2022; Cao et al., 2015).…”

Section: Introductionmentioning

confidence: 99%

“…Several studies have shown that their internal mineral fabrics may record regional strain increments superimposed on highly crystallized, already‐emplaced magma just before its final solidification (Andronicos et al., 1999; Archanjo et al., 1995; Benn, 1994, 2010; Burton‐Johnson et al., 2019; Chardon, 2003; Fowler & Paterson, 1997; Hutton, 1988; Kratinová et al., 2010; Mamtani et al., 2011, 2013; Paterson & Miller, 1998b). In turn, integrated high‐precision geochronologic and structural studies in successively emplaced plutons, or component intrusive units within batholiths, have now become routine to reconstruct the regional strain fields evolution through time (Archanjo et al., 2002; Benn et al., 2001; Burton‐Johnson et al., 2022; Cao et al., 2015; Liu et al., 2023; Salazar et al., 2016, Žák et al., 2017). Thermal models combined with U–Pb and K–Ar geochronology have shown, however, that the slowly solidifying pluton centers, often multiply rejuvenated by younger magma batches, are less straightforward strain recorders than pluton margins that cool quickly and ʽfreezeʼ mineral fabrics formed almost immediately after emplacement (Ardill et al., 2018; Karlstrom et al., 1993; Paterson et al., 2003; Žák, Holub, & Verner, 2005, Žák, Schulmann, & Hrouda, 2005, Žák et al., 2007, 2008).…”

Section: Introductionmentioning

confidence: 99%

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A Complex Interplay Between Pluton Emplacement, Tectonic Deformation, and Plate Kinematics in the Cretaceous Sierra Nevada Magmatic Arc, California

Tomek,

Žák,

Verner

et al. 2024

Tectonics

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The relation of plate kinematics to the structural record of arc plutons and their host rocks is complex and still not fully understood. We address this issue through a combination of field mapping, structural analysis, anisotropy of magnetic susceptibility analysis, and fabric modeling in the Late Cretaceous Tuolumne Intrusive Complex, Sierra Nevada, California. A pattern of anti‐clockwise rotation from ∼NNW–SSE to WNW–ESE steep foliations and change in fabric ellipsoid shape from oblate to prolate was revealed in successively emplaced Kuna Crest (∼95–92 Ma), Half Dome (∼92–89 Ma), and Cathedral Peak (∼89–84 Ma) granodiorites. The numerical model indicates that the Kuna Crest was emplaced in a transpressional setting with an angle of convergence α = 60–40°, whereas the Half Dome and Cathedral Peak required simultaneous vertical constriction overprinted by transpression with α = 35–15°. This transition, which occurred at ∼92 Ma, is accompanied by a shallowing of the lineation plunge observed also in other ∼88–84 Ma central Sierra Nevada plutons. Provided that the Cretaceous Sierra Nevada arc was constructed during overall dextral transpression, these transitions reflect significant changes in kinematics, where ∼107–92 Ma plutons were emplaced during pure shear‐dominated transpression, which was followed by a transition to wrench‐dominated transpression recorded in ∼92–84 Ma plutons. Such a transition in kinematics is explained as a result of progressively increasing obliquity of the relative convergence of the Farallon plate subducting beneath the North American continental margin, in agreement with most paleogeographic reconstructions.

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Section: Discussionsupporting

confidence: 52%

“…The above inferences provide an alternative hypothesis to that proposed recently by Burton-Johnson et al (2022).…”

Section: Farallon Plate Kinematics Recorded In the Pluton Fabricssupporting

confidence: 47%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

A Complex Interplay Between Pluton Emplacement, Tectonic Deformation, and Plate Kinematics in the Cretaceous Sierra Nevada Magmatic Arc, California

Tomek,

Žák,

Verner

et al. 2024

Tectonics

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“…Thus, the AMS axes are related to the strain field present during the final stages of magma crystallization [88]. This strain generates the AMS fabric, where the magnetic lineation (K1) coincides with the maximum extension direction (e 1 ), and the magnetic foliation is perpendicular to the maximum shortening direction (e 3 ) [89,90]. Magnetic foliations and lineations approximate the flattening plane and the stretching axis of the finite strain ellipsoid.…”

Section: Magnetic Fabric and Magmatic Strainmentioning

confidence: 99%

Deciphering Iberian Variscan Orogen Magmatism Using the Anisotropy of Magnetic Susceptibility from Granites

Sant’Ovaia,

Cruz,

Gonçalves

et al. 2024

Minerals

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In this paper, we have synthesized the information derived from more than 20 papers and PhD theses on the anisotropy of the magnetic susceptibility (AMS) of 19 Variscan granite plutons, spanning the period between 320 Ma and 296 Ma. The AMS data are obtained from 876 sampling sites with more than 7080 AMS measurements and a re-interpretation is proposed. The studied granites exhibit a magnetic susceptibility (Km) ranging from 30 to 10,436 × 10−6 SI units. Most granites typically exhibit Km values below 1000 × 10−6 SI, indicative of paramagnetic behavior. Biotite serves as the main carrier of iron (Fe), emphasizing the reduced conditions prevalent during the formation of granite melts in the Variscan orogeny. The AMS fabrics of the studied granite plutons record the magma strain, expressing the chronologic evolution of the stress field during the orogeny. This chronologic approach highlights the magmatic events between around 330 and 315 Ma, occurring in an extensional regime, in which the Borralha pluton is an example of a suite that recorded this extensional AMS fabric. Plutons with ages between 315 and 305 Ma show AMS fabrics, pointing out their emplacement in a compressional tectonic regime related to the Variscan collision. The plutons, younger than 305 Ma, record AMS fabrics indicating that the tectonic setting for emplacement changes from a wrench regime to an extensional one at the end of the collision stage. This is evident as there is a chronological overlap between the granites that exhibit AMS fabrics indicating extension and the ones that have AMS fabrics indicating a wrench regime.

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Anisotropy of magnetic susceptibility as the key to understand the ascending and emplacement mechanisms of granitic plutons: a review

Gonçalves,

Sant’Ovaia,

Noronha

2024

J Iber Geol

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Does tectonic deformation control episodic continental arc magmatism? Evidence from granitic magnetic fabrics (AMS)

Cited by 10 publications

References 154 publications

A Complex Interplay Between Pluton Emplacement, Tectonic Deformation, and Plate Kinematics in the Cretaceous Sierra Nevada Magmatic Arc, California

A Complex Interplay Between Pluton Emplacement, Tectonic Deformation, and Plate Kinematics in the Cretaceous Sierra Nevada Magmatic Arc, California

Deciphering Iberian Variscan Orogen Magmatism Using the Anisotropy of Magnetic Susceptibility from Granites

Anisotropy of magnetic susceptibility as the key to understand the ascending and emplacement mechanisms of granitic plutons: a review

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