One kilometre-thick ultramylonite, Sierra de Quilmes, Sierras Pampeanas, NW Argentina

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00025798%3A_____%2F15%3A00000021" target="_blank" >RIV/00025798:_____/15:00000021 - isvavai.cz</a>

Výsledek na webu

<a href="http://www.sciencedirect.com/science/article/pii/S0191814115000036" target="_blank" >http://www.sciencedirect.com/science/article/pii/S0191814115000036</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.jsg.2015.01.002" target="_blank" >10.1016/j.jsg.2015.01.002</a>

Jazyk výsledku

angličtina

Název v původním jazyce

One kilometre-thick ultramylonite, Sierra de Quilmes, Sierras Pampeanas, NW Argentina

Popis výsledku v původním jazyce

We describe a 1km-thick ultramylonite forming the high strain base of the ;3.5 km thick El Pichao shear zone in the Sierra de Quilmes. This shear zone thrusted granulite facies migmatites onto amphibolite facies schists during the 470 Ma Famatinian orogeny. Strain grades upwards from ultramylonites to weakly sheared migmatites across the 3.5 km zone and the mylonitic rocks define a geochemical field narrower than the protolith suggesting they underwent mixing and homogenization through shearing. Ultramylonites this thick are uncommon. The width of a shear zone, in the absence of significant compositional rheological contrasts controlling strain localization, is controlled by the balance between shear heat generation and diffusion. Under typical crustalconditions a strain rate of 10-12s-1 is required to form a 1 km-thick ultramylonite, and this is achieved when large movement velocities are imposed across the shear zone. We postulate that the El Pichao shear zone and its thick ultramyl

Název v anglickém jazyce

One kilometre-thick ultramylonite, Sierra de Quilmes, Sierras Pampeanas, NW Argentina

Popis výsledku anglicky

We describe a 1km-thick ultramylonite forming the high strain base of the ;3.5 km thick El Pichao shear zone in the Sierra de Quilmes. This shear zone thrusted granulite facies migmatites onto amphibolite facies schists during the 470 Ma Famatinian orogeny. Strain grades upwards from ultramylonites to weakly sheared migmatites across the 3.5 km zone and the mylonitic rocks define a geochemical field narrower than the protolith suggesting they underwent mixing and homogenization through shearing. Ultramylonites this thick are uncommon. The width of a shear zone, in the absence of significant compositional rheological contrasts controlling strain localization, is controlled by the balance between shear heat generation and diffusion. Under typical crustalconditions a strain rate of 10-12s-1 is required to form a 1 km-thick ultramylonite, and this is achieved when large movement velocities are imposed across the shear zone. We postulate that the El Pichao shear zone and its thick ultramyl

Druh

J_x - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)

CEP obor

DB - Geologie a mineralogie

OECD FORD obor

—

Projekt

<a href="/cs/project/GA14-25995S" target="_blank" >GA14-25995S: Nový pohled na diverzitu granitů z hlediska procesů migrace taveniny mezi zdrojem a plutonem</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2015

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Journal of Structural Geology

ISSN

0191-8141

e-ISSN

—

Svazek periodika

72

Číslo periodika v rámci svazku

January

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

21

Strana od-do

33-54

Kód UT WoS článku

000351647900003

EID výsledku v databázi Scopus

—