The “Taourirt” magmatic province, a marker of the closing stage of the Pan-African orogeny in the Tuareg Shield: review of available data and Sr–Nd isotope evidence

Azzouni-Sekkal, Abla; Liégeois, Jean-Paul; Bechiri-Benmerzoug, F.; Belaidi-Zinet, Safia; Bonin, Bernard

doi:10.1016/j.jafrearsci.2003.07.001

Cited by 87 publications

(61 citation statements)

References 43 publications

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“…It is hard to con strain whether the in ferred sig nif i cant amount of the flu ids de liv ered was con nected ex clu sively with the host magma and was gen er ated due to melt ing of the up per crust (Bettencourt et al, 2005), or whether it was ac ti vated as an ef fect of de gas sing of the up per most part of the metasomatised man tle (Charoy and Raimbault, 1994). Undoubt edly, the flu ids mi grated through chan nel sys tems connected with frac tures (e.g., Azzouni-Sekkal et al, 2003). Field ob ser va tions sug gest that the dis tri bu tion of the grei sens in the BGCh area is de ter mined by the pres ence of joint sys tems.…”

Section: Discussionmentioning

confidence: 99%

The Baga-Gazriin Chuluu A-type granites of Central Mongolia compared with other igneous bodies nearby: a geochemical approach

Machowiak

Stawikowski

2012

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The sub ject of the study are the re la tion ships be tween the Late Tri as sic A-type gran ites of the Baga-Gazriin Chuluu pluton in Cen tral Mon go lia and the mag matic bod ies lo cated ei ther ad ja cent to or a short dis tance from this in tru sion. We com pare new geo chem i cal data from the most rep re sen ta tive sam ples of the Baga-Gazriin Chuluu pluton with pub lished data from the Me so zoic granitoids of the Egiindavaa com plex and Tsagduul mas sif in the Hotont area. The geo chem i cal anal y ses of all these granitoids are also com pared with the geo chem i cal char ac ter is tics of trachyandesites of un known age which neigh bour the Baga-Gazriin pluton. The Baga-Gazriin gran ites, most of the Tsagduul gran ites and a few sam ples from Egiindavaa are A-gran ites with strong crustal af fin ity. By con trast, most of the Egiindavaa granitoids in clude con sid er able man tle-de rived ma te rial and thus seem ingly formed in dif fer ent con di tions, with a higher water con tent in the magma. The trachyandesites ad ja cent to the Baga-Gazriin Chuluu pluton have been re ferred to a Perm ian vol cano-sed imen tary com plex, mak ing them dis tinctly older than the granitoids. All the A-type gran ites dis cussed were emplaced in extensional con di tions, which de vel oped af ter ces sa tion of the compressional re gime re sult ing from the clo sure of the Mon gol-Okhotsk Ocean. The shal low-ly ing source for their gen er a tion was con nected with slab break-off or the pres ence of a hot spot. The granitoids, in the late stage of crystallisation, were en riched in com plex ions that were REE car ri ers, as shown by a dis tinct "tetrad ef fect". Katarzyna Machowiak, In sti tute of Civil En gi neer ing, Poznañ Uni ver sity of Tech nol ogy,

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Section: Discussionmentioning

confidence: 99%

The Baga-Gazriin Chuluu A-type granites of Central Mongolia compared with other igneous bodies nearby: a geochemical approach

Machowiak

Stawikowski

2012

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“…900 Ma) (Henry et al 2009); and (2) during the late Pan-African orogeny, from 660 to 580 Ma (Cryogenian-Ediacaran), these early collages were deformed between two giant cratonic masses, the 2 Ga Western African Craton (WAC) to the west, and the East Saharan metacraton to the east, resulting in northward escape of the Tuareg terranes along N-S mega-shear zones (Nouar et al 2011;Liégeois et al 2013). During that period, large high-K calc-alkaline (HKCA) batholiths were intruded along linear N-S zones paralleling the mega-shear zones, and extensive migmatization affected the metacratons (e.g., Assodé-Issalane terrane), related to linear lithospheric delamination along the submeridian mega-shear zones (Azzouni-Sekkal et al 2003;Abdallah et al 2007). …”

Section: Geological Background: the Tuareg Shieldmentioning

confidence: 99%

“…580 Ma, post-collisional stages of the Pan-African orogeny are marked in the western and central Hoggar by late movements along still-active mega-shear zones, under upper-crustal conditions. Other post-collisional events include the production of new HKCA granitoid melts, which evolved towards alkaline or even peralkaline (western part of Tuareg shield) magmatism Azzouni-Sekkal et al 2003). The latest activity along the mega-shear zones was transtensional and is dated as late Ediacaran to early Cambrian (540 Ma; Boullier et al 1986) or slightly younger (520 Ma; Paquette et al 1998).…”

Section: Geological Background: the Tuareg Shieldmentioning

confidence: 99%

“…The Laouni terrane is particularized by the numerous late-to post-kinematic high-level granite plutons that were emplaced from 580 to ca. 520 Ma (Cheilletz et al 1992;Azzouni-Sekkal et al 2003).…”

Section: The East Hoggar and Central Hoggar Metacratonsmentioning

confidence: 99%

“…Like in the adjacent Laouni terrane, there are numerous (≥20) high-level HKCA granite plutons evolving towards alkaline magmatism, the so-called "Taourirt granites" (Azzouni-Sekkal and Boissonnas 1993;Azzouni-Sekkal 1995;Azzouni-Sekkal et al 2003). They were dated at ca.…”

Section: The Young (Juvenile) Terranesmentioning

confidence: 99%

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The Hoggar Gold and Rare Metals Metallogenic Province of the Pan-African Tuareg Shield (Central Sahara, South Algeria): An Early Cambrian Echo of the Late Ediacaran Murzukian Event?

Marignac

Aissa

Bouabsa

et al. 2016

Mineral Deposits of North Africa

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The Hoggar massif, a part of the Tuareg shield in the Trans-Saharan Pan-African orogen, is endowed in gold and rare metals (Sn, W, Ta, Be). Most of these metals are present at low levels compared to other Precambrian or collisional belts worldwide, but tantalum is concentrated in a series of evolved granitic cupolas, making the Hoggar a promising tantalum province. The Tuareg shield was built in three stages during the convergence of two cratonic masses, the West African Craton (WAC) to the west and the East Saharan craton to the east. The first stage (730-630 Ma; Cryogenian) involved the accretion of island and continental arcs to several cratons. The second stage (630-580 Ma, Ediacaran) was a collisional event, involving (1) northward escape of the Tuareg terranes between the two main cratons, along N-S mega-shear zones with up to 1000 km of lateral displacement; (2) emplacement of large high-K calc-alkaline (HKCA) linear batholiths resulting from mantle-crust interaction through linear lithospheric delamination along the mega-shear zones; and (3) concomitant high temperature-low pressure metamorphism. As a result, the small Eburnean cratons included in the Tuareg shield (In Ouzzal; Laouini-Azrou-n-Fad-Tefedest-Egere-Aleksod, or LATEA) were more or less reworked (metacratonization). The third stage (575-540 Ma, late Ediacaran) was limited to the eastern Hoggar province, and involved the intracratonic collision of terranes within the margin of the East Saharan metacraton (Murzukian event, Fezaa et al. 2010). Immediately following the Murzukian event (540-520 Ma, terminal Ediacaran-early Cambrian) was simultaneous reactivation of late (transtensional) mega-shear zones, intrusion of high-level granite plutons related to rare-metal mineralization, and inception of crustal-scale hydrothermal systems and gold mineralization. The granite plutons comprise a series of A-type granites that evolved towards F-rich (topaz-bearing) alaskites, and true peraluminous, F-NaLi-rich rare-metal granites (RMGs), with evidence of mixing between the two lineages. However, only the RMG suites are associated with Sn-W quartz veins, whereas Ta-rich cupolas may be found either in the Taourirt lineage (Tim Mersoi and highly fractionated Rechla cupolas) or in the RMG suites (Ebelekan)-the rare-metal enrichment being, in any case, of magmatic origin. Emplacement of these late granites was controlled either by the mega-shear zones, as in the Iskel island arc terrane, or by secondary shears of various orientation (N10°E, N50°E, N140°E) that dissect the terranes, as in the LATEA metacraton. The quartz-gold deposits are of the "orogenic gold" class and display contrasting relationships with the shear-zone systems, from close spatial associations with mega-shear zones as in the shear-zone-hosted In Ouzzal deposits (Tirek-Amesmessa) and the Iskel showings, to the very distal association with the Raghane shear zone as in the Tiririne deposits, through the connexion with secondary N10°E shear zones of the In Abeggui deposits in the LATEA. In...

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Primary Studies of Taessa-Torak Granitic Massif: Petrography and Mineralogy (Central Hoggar, Algeria)

Ikhlef-Debabha¹,

Azzouni-Sekkal²,

Benhallou³

et al. 2019

Advances in Science, Technology &Amp; Innovation

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The “Taourirt” magmatic province, a marker of the closing stage of the Pan-African orogeny in the Tuareg Shield: review of available data and Sr–Nd isotope evidence

Cited by 87 publications

References 43 publications

The Baga-Gazriin Chuluu A-type granites of Central Mongolia compared with other igneous bodies nearby: a geochemical approach

The Baga-Gazriin Chuluu A-type granites of Central Mongolia compared with other igneous bodies nearby: a geochemical approach

The Hoggar Gold and Rare Metals Metallogenic Province of the Pan-African Tuareg Shield (Central Sahara, South Algeria): An Early Cambrian Echo of the Late Ediacaran Murzukian Event?

Primary Studies of Taessa-Torak Granitic Massif: Petrography and Mineralogy (Central Hoggar, Algeria)

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