Temporal and magmatic evolution of the Neoproterozoic ultramafic and mafic Ougda arc complex and associated granitoids (Western Tuareg Shield, Algeria)

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00025798%3A_____%2F25%3A10169621" target="_blank" >RIV/00025798:_____/25:10169621 - isvavai.cz</a>

Result on the web

<a href="https://doi.org/10.1016/j.precamres.2025.107903" target="_blank" >https://doi.org/10.1016/j.precamres.2025.107903</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.precamres.2025.107903" target="_blank" >10.1016/j.precamres.2025.107903</a>

Result language

angličtina

Original language name

Temporal and magmatic evolution of the Neoproterozoic ultramafic and mafic Ougda arc complex and associated granitoids (Western Tuareg Shield, Algeria)

Original language description

The Ougda area, located within the Tassendjanet terrane of the Western Tuareg Shield, hosts a large (ultra)mafic complex associated with granitoid intrusions. This magmatic complex represents a Neoproterozoic continental arc, active between 749 +/- 2 Ma and 653 +/- 4 Ma ago; during this time, various ultramafic and mafic (meta) cumulates (serpentinites, hornblendites, garnet amphibolites, amphibolites and leucogabbros) and noncumulates (amphibole gabbros, quartz diorites, diorites) were emplaced. The latter exhibit a calc-alkaline affinity. Sr-Nd isotope data reveal a distinct contrast between North and South Ougda ultramafic and mafic units. The North Ougda units have a more juvenile signature (epsilon Nd = +6.3 to +9.4, ISr = 0.70248-0.70377) than the South Ougda units (epsilon Nd = +5.3 to +6.3, ISr = 0.70267-0.70400). Early arc construction is represented by the emplacement of the South Ougda units into a thinned juvenile crust at shallow crustal levels. In contrast, the younger and more juvenile North Ougda units were emplaced at deeper crustal levels, likely at the base of the arc crust. Syn-collisional granitoids, dated at 626 +/- 5 Ma and 627 +/- 4 Ma, intruded the Tassendjanet terrane and show a hybrid juvenile-crustal signature (epsilon Nd = +2.68 to -8.04, ISr = 0.70296-0.70743), interpreted as resulting from the partial melting of juvenile basaltic rocks in the lower crust of the Ougda arc, followed by the crustal contamination of primitive magmas. In addition, aplitic dykes crosscutting these granitoids display geochemical characteristics similar to those of the post-collisional granites that sealed the Panafrican orogeny in the Tuareg Shield. The Ougda continental arc complex is believed to have formed during the closure of an oceanic basin, leading to the amalgamation of West Gondwana and ultimately to the Pan-African orogeny observed across the Neoproterozoic NW African provinces.

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

—

Continuities

V - Vyzkumna aktivita podporovana z jinych verejnych zdroju

Publication year

2025

Confidentiality

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

Name of the periodical

Precambrian Research

ISSN

0301-9268

e-ISSN

1872-7433

Volume of the periodical

430

Issue of the periodical within the volume

107903

Country of publishing house

NL - THE KINGDOM OF THE NETHERLANDS

Number of pages

23

Pages from-to

nestránkováno

UT code for WoS article

001569469500001

EID of the result in the Scopus database

2-s2.0-105015486486