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

Kód výsledku v 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>

Výsledek na webu

<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>

Jazyk výsledku

angličtina

Název v původním jazyce

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

Popis výsledku v původním jazyce

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.

Název v anglickém jazyce

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

Popis výsledku anglicky

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.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10505 - Geology

Projekt

—

Návaznosti

V - Vyzkumna aktivita podporovana z jinych verejnych zdroju

Rok uplatnění

2025

Kód důvěrnosti údajů

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

Název periodika

Precambrian Research

ISSN

0301-9268

e-ISSN

1872-7433

Svazek periodika

430

Číslo periodika v rámci svazku

107903

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

23

Strana od-do

nestránkováno

Kód UT WoS článku

001569469500001

EID výsledku v databázi Scopus

2-s2.0-105015486486