Tectonic rotations and internal structure of Eocene plutons in Chuquicamata, northern Chile

Somoza, Rubén; Tomlinson, Andy J.; Zaffarana, Claudia Beatriz; Singer, Silvia; Negre, Carla G. Puigdomenech; Raposo, María Irene Bartolomeu; Dilles, John H.

doi:10.1016/j.tecto.2015.05.005

Cited by 7 publications

(6 citation statements)

References 66 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Its AMS fabric displays a variable lineation about a NNE-SSW girdle, with a steeply plunging maxima, and its overall foliation is steeply dipping and NNE-SSW striking. Somoza et al (2015) interpreted this fabric as representing a combination of vertical magma sheet injection and tectonic strain. 7.2.2.…”

Section: Chile Data Compilationmentioning

confidence: 99%

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

et al. 2022

View full text Add to dashboard Cite

Section: Chile Data Compilationmentioning

confidence: 99%

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

et al. 2022

View full text Add to dashboard Cite

“…Our understanding of the spatial distribution and timing of deformation have improved in recent years, and paleomagnetic data throughout the entire orogenic system (e.g. Arriagada et al, 2006;Barke et al, 2007;Roperch et al, 2006;Somoza et al, 1996Somoza et al, , 2015Somoza and Tomlinson, 2002) currently resolve, at the regional scale, the socalled central Andean rotation pattern (CARP), defined by Somoza et al (1996). This data defines a broad rotation pattern of clockwise rotations in the southern limb and counterclockwise rotations in the northern limb, which is coincident with present geodetic observations (Allmendinger et al, 2005).…”

Section: Introductionmentioning

confidence: 58%

A new constraint on the central Andean rotation pattern from paleomagnetic studies in the southern Subandes of Bolivia

Calvagno

Gallo

Tomezzoli

et al. 2020

Journal of South American Earth Sciences

View full text Add to dashboard Cite

This is a PDF file of an article that has undergone enhancements after acceptance, such as the addition of a cover page and metadata, and formatting for readability, but it is not yet the definitive version of record. This version will undergo additional copyediting, typesetting and review before it is published in its final form, but we are providing this version to give early visibility of the article. Please note that, during the production process, errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.

show abstract

“…The domain state of magnetite was studied using the diagram of Day et al (1977), which was constructed with the Hc, Ms and Mr (coercive force, saturation magnetization and remanent magnetization, respectively) hysteresis parameters, together with the remanent coercive force Hcr (obtained from the backfield curve; Bouchez, 2000). Anhysteretic remanence measurements (Somoza et al 2015) were also performed in some representative samples to check the coaxial behaviour of the ferromagnetic and paramagnetic fabric of the rocks.…”

Section: A Anisotropy Of Magnetic Susceptibility (Ams)mentioning

confidence: 99%

“…The anisotropy of anhysteretic remanent magnetization (AARM; e.g. Somoza et al 2015) was applied in three sites. Measurements were performed in the Department of Earth and Environment Sciences, Ludwig-Maximilians University in Munich, using equipment called a 'SushiBar' (Wack & Gilder, 2012).…”

Section: A Anisotropy Of Magnetic Susceptibility (Ams)mentioning

confidence: 99%

“…The AMS method has been proven to be a very useful tool to study the internal structure of weakly foliated bodies (e.g. Archanjo et al 1995Archanjo et al , 2002de Saint Blanquat & Tikoff, 1997;Ferré & Améglio, 2000;McNulty et al 2000;Neves et al 2003;Žák et al 2005;D'Eramo et al 2006;Stevenson, 2009;Somoza et al 2015;Nédélec & Bouchez, 2015;Olivier et al 2016;Zaffarana et al 2017). In particular, the AMS method is relevant for the resolution of magmatic lineations, which are generally hard to measure in the field.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Emplacement conditions and exhumation of the Varvarco Tonalite and associated plutons from the Cordillera del Viento, Southern Central Andes

et al. 2022

View full text Add to dashboard Cite

During the Late Cretaceous Andean orogeny, the compressive deformation associated with the shallowing of the subducting slab caused the development of the arc-related igneous rocks known as the Naunauco Belt. This study presents petrographic, mineralogical and anisotropy of magnetic susceptibility data for the Varvarco Intrusives (the Varvarco Tonalite, Butalón Tonalite and Radales Aplite), which crop out in the Cordillera del Viento, Neuquén Province, Argentina. The assembly of plutons was formed by mafic magma episodic injection. Amphibole and biotite compositions suggest that the Varvarco Tonalite is related to calc-alkaline, I-type magmas, typical of subduction environments. Different geothermobarometers based on amphibole and plagioclase compositions for the Varvarco Tonalite suggest shallow emplacement conditions (∼2–3 kbar, equivalent to ∼12 km depth). Apatite fission-track analyses give exhumation ages of 67.5 ± 8 Ma for the Varvarco Tonalite and 50.3 ± 5.9 Ma for the Butalón Tonalite. A calculated continuous fast exhumation rate of at least 330 °C Ma−1 is consistent with the shallow emplacement conditions, textural data and geobarometric estimations. In agreement with the thermal profile, the magmatic system was exhumed by ∼12 km within c. 2.1 Ma implying a geothermal gradient of ∼62.5 °C km−1. The last step of exhumation occurred between ∼65.3 and 56.9 Ma. The magmatic fabrics observed in the studied plutons reflect mostly magma chamber processes. The Varvarco Intrusives represent satellite calc-alkaline plutons of the North Patagonian Batholith which were emplaced syn- to post-tectonically with respect to a major deformation stage of the Southern Central Andes.

show abstract

Tectonic rotations and internal structure of Eocene plutons in Chuquicamata, northern Chile

Cited by 7 publications

References 66 publications

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

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

A new constraint on the central Andean rotation pattern from paleomagnetic studies in the southern Subandes of Bolivia

Emplacement conditions and exhumation of the Varvarco Tonalite and associated plutons from the Cordillera del Viento, Southern Central Andes

Contact Info

Product

Resources

About