Autochthonous origin of the Encruzilhada Block, Dom Feliciano Belt, southern Brazil, based on aerogeophysics, image analysis and PT-paths

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00025798%3A_____%2F21%3A00000265" target="_blank" >RIV/00025798:_____/21:00000265 - isvavai.cz</a>

Result on the web

<a href="https://www.sciencedirect.com/science/article/pii/S0264370721000119" target="_blank" >https://www.sciencedirect.com/science/article/pii/S0264370721000119</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.jog.2021.101825" target="_blank" >10.1016/j.jog.2021.101825</a>

Result language

angličtina

Original language name

Autochthonous origin of the Encruzilhada Block, Dom Feliciano Belt, southern Brazil, based on aerogeophysics, image analysis and PT-paths

Original language description

The Encruzilhada Block lies between the eastern hinterland and western foreland of the Dom Feliciano Belt (southern Brazil) and its tectonic meaning in the orogenic evolution of the belt is still poorly understood. Its low magnetic signal is similar to that of the foreland supracrustal sequences, whereas the high gammaspectrometric signal appears due to the hinterland post-collisional granitoids. Satellite image lineament analysis points to tectonic similarities between the Encruzilhada Block and the foreland, as the structures in both domains show predominantly NNW and NNE trends, while the hinterland mostly presents NE-trending structures. The preorogenic connection between the Encruzilhada Block and the foreland is indicated by the correlation between the Varzea do Capivarita and Cerro da Arvore complexes. Both contain 800 – 780 Ma metaigneous rocks with arc-like geochemistry, and parametamorphic rocks with similar sedimentary provenance. Common syn-orogenic deformation history of both complexes is suggested by progressive to P-T o-th E-W transpressive deformation andsimilar peak metamorphic age (660 – 640 Ma). PT-paths suggest exhumation of the hinterland V´arzea do Capivarita Complex from high-T/low-P conditions of 790–820 ◦C/4.4–4.8 kbar to 660–720 ◦C/2.5–3.4 kbar at ca. 630 Ma. On the other hand, the foreland Cerro da ´Arvore Complex was subject to progressive metamorphism from 555 to 565 ◦C/5.4–5.7 kbar to 560–580 ◦C/5.8–6.3 kbar, which is interpreted as a result of orogenic thickening. Evidence suggests that both complexes have originated in a similar, if not a single, basin on an attenuated lithosphere with high geothermal gradient, possibly a (back-arc?) rift. Oblique collision has caused basin inversion and thrusting of the lower crust over the rift margin, which may have been accompanied by lithosphere delamination. Progressive transpressional deformation and voluminous post-collisional magmatism (640 – 578 Ma) controlled by major lineaments have blurred the original tectonic contact and finally caused thermal metamorphism in both complexes at ca. 3 kbar, when the autochthonous Encruzilhada Block was stabilized in its present geological configuration. The intracontinental character of major shear zones limiting hinterland and foreland requires a review of the existing evolutionary model for the Dom Feliciano Belt in the context of Western Gondwana amalgamation.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

10505 - Geology

Project

<a href="/en/project/GA18-24281S" target="_blank" >GA18-24281S: Did the West-Gondwana orogens form by inversion of long-lived rift domains?</a><br>

Continuities

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

Publication year

2021

Confidentiality

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

Name of the periodical

Journal of Geodynamics

ISSN

0264-3707

e-ISSN

—

Volume of the periodical

144

Issue of the periodical within the volume

March : 101825

Country of publishing house

GB - UNITED KINGDOM

Number of pages

23

Pages from-to

nestránkováno

UT code for WoS article

000631877600001

EID of the result in the Scopus database

2-s2.0-85100772866