Synkinematic interplay between felsic dykes and host rock mylonitization: how magmatism assists the formation of ductile narrow shear zones in the Sierra Chica de Córdoba, Argentina

Boffadossi, M. Alejandra; Coniglio, Jorge E.; Maffini, M. Natalia; Pinotti, Lucio; Radice, Stefania; Muratori, María Eugenia

doi:10.1016/j.jsames.2020.103063

Cited by 5 publications

(2 citation statements)

References 99 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In addition, some fish-shaped felsic veins are sandwiched between mylonitic layers (Figure 6E). These dykes are usually used as ideal chronometers for determining the deformation timing of the shear zones (Hanmer et al, 1997;Brown and Solar, 1998;Ring and Collins, 2005;Boffadossi et al, 2020).…”

Section: Structural and Deformation Features 31 The Bounding Myloniti...mentioning

confidence: 99%

“…Evolution of the melts/fluids and processing of the deformation structures are regarded as manifestation of self-organization for the highly non-equilibrium orogenic systems to efficiently reduce the energetic gradients (Brown and Solar, 1998). Zircon crystallized or overgrown from the melts in the syn-kinematic intrusions and anetexites, or precipitated from the metamorphic fluid in syn-kinematically metamorphosed tectonites provides valuable constraints on the temporal scale of the high-grade deforming complex (Hanmer et al, 1997;Brown and Solar, 1998;Nzenti et al, 2006;Boffadossi et al, 2020;Jolivet et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Early cretaceous multi-stage extension in the North Dabie complex in the eastern central China: insights from structural and geochronological data

Huang,

Yan,

Xiao

et al. 2024

Front. Earth Sci.

View full text Add to dashboard Cite

A dominantly NW-SE directed extensional tectonics in the Early Cretaceous significantly reworked the Late Permian-Triassic orogenic framework of the Dabie orogenic belt. The North Dabie complex (NDC) is the principal domain recording this tectonic event. However, the precise structure-kinematic architectures, particularly those observed in the ductile regime, along with the respective time scales for different extensional stages, have not been adequately established. This significantly impedes our comprehensive understanding of the extensional style and deformation history in the North Dabie complex. To better address these issues, we conducted a systematic structural study and LA-ICP-MS zircon U-Pb dating of the pre-, syn-, and post-kinematic intrusions and syn-kinematically metamorphosed high-grade gneisses/migmatites of the NDC. Our results demonstrate that the extensional deformation in the NDC may initiate at ca. 144 Ma, which is characterized by a pervasive NW-SE oriented coaxial plastic flow in the ductile regime of the middle-lower crust. A large-scale detachment processing zone subsequently started activating at ca. 140 Ma at the upper-middle level of the middle crust, and concentratedly accommodated the extensional strain by top-to-NW ductile shearing. Locally, there was uprising of sub-magmatic flow in the atatexite-diatexite from the deeper lower crust taking place in the manner of top-to-outward shearing as early as ca. 137 Ma. This composite process of extension manifests vertical strain partitioning across the ductile middle-lower crusts and progressive strain localization during the lithospheric thinning. The NW-SE orientation dominated extensional tectonics was strongly driven by the westward subduction of the Paleo-Pacific oceanic plate during the Late Mesozoic.

show abstract

Section: Structural and Deformation Features 31 The Bounding Myloniti...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Early cretaceous multi-stage extension in the North Dabie complex in the eastern central China: insights from structural and geochronological data

Huang,

Yan,

Xiao

et al. 2024

Front. Earth Sci.

View full text Add to dashboard Cite

show abstract

The Cambrian (Pampean) and early Ordovician (Famatinian) magmatic/migmatitic belt in the Eastern Sierras Pampeanas, Argentina

Bellos,

Boffadossi,

Demartis

et al. 2024

Journal of South American Earth Sciences

View full text Add to dashboard Cite

Famatinian magmatism in the SW Gondwana margin: A review focused on the Sierras Pampeanas (Argentina)

Alasino,

Larrovere,

Ratschbacher

et al. 2024

Journal of South American Earth Sciences

View full text Add to dashboard Cite

Synkinematic interplay between felsic dykes and host rock mylonitization: how magmatism assists the formation of ductile narrow shear zones in the Sierra Chica de Córdoba, Argentina

Cited by 5 publications

References 99 publications

Early cretaceous multi-stage extension in the North Dabie complex in the eastern central China: insights from structural and geochronological data

Early cretaceous multi-stage extension in the North Dabie complex in the eastern central China: insights from structural and geochronological data

The Cambrian (Pampean) and early Ordovician (Famatinian) magmatic/migmatitic belt in the Eastern Sierras Pampeanas, Argentina

Famatinian magmatism in the SW Gondwana margin: A review focused on the Sierras Pampeanas (Argentina)

Contact Info

Product

Resources

About