Clinopyroxene trace element compositions of cumulate mafic rocks and basalts from the Hercynian Moroccan Central Meseta: Petrogenetic implications

Driouch, Youssef; Béziat, Didier; Grégoire, Marilaure; Laguenini, F.; Abbou, Mohamed Ben; Ntarmouchant, A.; Roddaz, Martín; Dahire, M.; Bennouna, Azzeddine; Belkasmi, Mohammed; Brusset, Stéphane; Debat, Pierre

doi:10.1016/j.jafrearsci.2009.05.007

Cited by 25 publications

(3 citation statements)

References 19 publications

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“…In order to assess the possibility that mineral separates contain more than one mineral component, the trace element compositions of the separates were compared with two datasets: 1) LA-ICPMS from hornblende, chlorite, biotite and epidote, thin sections of Wallundry Suite samples (Iles et al, 2015), and 2) a compilation of literature values for hornblende, biotite, titanite, ilmenite, zircon and epidote in other rocks (Luhr and Carmichael, 1980;Bea et al, 1994;Bea, 1996;Bingen et al, 1996;Pan and Fleet, 1996;Ayres and Harris, 1997;Belousova et al, 2002;Hermann, 2002;Jang and Naslund, 2003;Villaseca et al, 2003;Storkey et al, 2005;Tiepolo and Tribuzio, 2005;Bea et al, 2006;Gregory et al, 2009;Acosta-Vigil et al, 2010;Driouch et al, 2010;Nehring et al, 2010;Colombini et al, 2011;Gregory et al, 2012;Starijaš Mayer et al, 2014;Xing et al, 2014). Based on these comparisons (particularly examining REE, Hf and Zr), the hornblende separates from sample J are essentially monomineralic (i.e., minimal contribution from inclusions of other phases), but the pseudomorphs after hornblende from WG are a mixture dominated by chlorite and biotite with a possible minor component similar to the titanite-epidote separate.…”

Section: Geochemistry Of Mineral Separatesmentioning

confidence: 99%

Multi-scale isotopic heterogeneity reveals a complex magmatic evolution: An example from the wallundry suite granitoids of the lachlan fold belt, Australia

Iles

Hergt²,

Woodhead³

2023

Front. Earth Sci.

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Open-system magmatic processes are expected to impart various sorts of isotopic heterogeneity upon the igneous rocks they produce. The range of processes under the “open-system” umbrella (e.g., simple two-component mixing, magma mingling, assimilation with fractional crystallization) cannot usually be uniquely identified using data from a single isotope system. The use of bulk-rock, mineral separate and in situ techniques and multiple isotope systems allows the characterization of isotopic variability at different sampling scales, illuminating details of the petrogenesis of a magmatic system. This approach has been applied to granitoids of the Wallundry Suite in the Lachlan Fold Belt, Australia. The Wallundry Suite exhibits variations in mineral assemblage, mineral composition and trends in bulk-rock major and trace element compositions consistent with the involvement of liquid-crystal sorting processes such as fractional crystallization. In situ paired O-Hf isotope data from zircon in six samples show an array indicating the isotopic evolution of the melt phase. Similarly, bulk-rock Sr-Nd-Hf isotope arrays support open-system magma evolution. These data combined with the petrographic observations and major and trace element geochemical variations suggest some form of assimilation-fractional crystallization process in the petrogenesis of the Wallundry Suite. Added complexity is revealed by two observations: 1) the isotopic variations are only weakly coupled to the lithology and major element compositions of the samples; and 2) there are distinguishable differences between the Hf isotope compositions of bulk-rock samples and those of the magmatic zircons they host. To varying degrees the rocks consistently show negative ΔεHfbulk-zrc values (i.e., the bulk-rock compositions have less radiogenic Hf isotope values than their coexisting zircons). The preservation of distinctly low Nd and Hf isotope ratios in an Fe-Ti oxide mineral separate suggests that the bulk-rock vs. zircon discrepancy is caused by the presence of unmelted components derived from a contaminant of continental origin (i.e., a rock with low Sm/Nd and Lu/Hf and thus unradiogenic Nd and Hf). Evidently, a complex interplay of assimilation, crystallization and melt segregation is required to account for the data. This investigation demonstrates that such complexity can, nevertheless, be disentangled through comparison of complementary isotope data at multiple sampling scales.

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Section: Geochemistry Of Mineral Separatesmentioning

confidence: 99%

Multi-scale isotopic heterogeneity reveals a complex magmatic evolution: An example from the wallundry suite granitoids of the lachlan fold belt, Australia

Iles

Hergt²,

Woodhead³

2023

Front. Earth Sci.

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“…Some intrusive basaltic bodies (sills) lie parallel to layered beds of sandstone and pelite of the country rocks and induced small aureoles of metamorphism. These magmatic dikes and sills were previously studied by different authors (Cheilletz and Zimmerman 1982;Kharbouch 1994;Ntarmouchant 2003;Driouch et al 2010). According to their petrographic and chemical composition, they were attributed to calc-alkaline magmatism and were interpreted as the result of an hypothetical continental subduction zone occurring in this region during Carboniferous (Ben Abbou 1990;Ntarmouchant 2003;Driouch et al 2010).…”

Section: Geologic Settingmentioning

confidence: 99%

Geologic interpretation of the aeromagnetic survey in the Agourai area (Central Morocco)

Bouya¹,

Ouardi²,

Habibou³

et al. 2013

Central European Geology

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The aim of this work is to interpret the geologic structures of the Agourai area (Paleozoic and Mesozoic structures) from processed magnetic maps. The detected magnetic anomalies from different standard methods used in aeromagnetism (Residual map, RTP map, horizontal gradient map) were compared to geologic structures and permit enhancing the mapping quality of some areas, and thus defining many geologic features. Existing geologic maps and geologic field studies allow interpreting some detected anomalies. It was thus possible to define the limits between the Paleozoic basement and the Mesozoic cover, to determine magnetic anomalies according to NE-SW trends compatible with the regional geologic structures and finally to detect a NE to SW-oriented fault system in the Mesozoic cover of the Agourai Plateau. Despite the reliability of this approach, some folded basaltic sills occurring in this region were not well detected, probably because of their reduced thickness.

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“…Wager & Brown, 1968;Aït-Djafer et al, 2003) e diferenciar corpos gabróicos de diferentes ambientes tectônicos Oliveira & Tarney, 1990). O clinopiroxênio é comumente usado como indicador petrogenético na evolução de magmas e sua composição química pode fornecer informações sobre a trajetória evolutiva do magma parental e ajudar a caracterizar o ambiente tectônico de formação da rocha (Driouch et al, 2010).…”

Section: Significado Da Composição Mineralunclassified

Geoquímica de rochas máficas da região de São José do Jacauípe, segmento norte do Orógeno Itabuna-Salvador-Curaçá, Cráton do São Francisco, Bahia

Piaia¹

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Master Dissertation PATRÍCIA PIAIA Mafic and ultramafic complex are commons in orogenics belts and can represent differents tectonics environments like arcs roots, obducted parts of ophiolites, oceanic plateaus, litospheric mantle wedge or an aborted rift. Field, petrographic, mineral chemistry and litogeochemistry characteristics are important to characterize the formation environment. The Itabuna-Salvador-Curaçá belt is one of the Precambrian belts consolidated during the Paleoproterozoic. This belt hosts a lot of mafic and ultramafic bodies and the petrogenesis understanding of these bodies is difficult because they are often metamorphosed in granulite facies. The São José do Jacuípe metamorphic gabbro-anorthositic suit is one of these bodies. It´s a conjunct of stratified cumulatic rocks constituted by metaanorthosites, meta-leucogabbros, meta-leuconorites, meta-gabbros and meta-gabbronorites with associated metapyroxenite. These rocks have lithogeochemistry and mineral chemistry characteristics similar to arc mafic magmatism. They are being interpreted as a remaining of a mafic root of a magmatic arc and, in case of Itabuna-Salvador Curaçá belt, this arc probably is represented by the Caraíba Complex. Others complex that stand out in this region are the mafic dykes swarms. They are abundant in the north part of the Itabuna-Salvador-Curaçá belt. One of them is Aroeira swarm that occurs in the central and more deformed part of the belt. Their rocks have a gabbronoritic composition and sometimes are confounded with São José do Jacuípe´s rocks. The swarm intruded a continental crust, has a tholeitic and sub-alcaline character and affinity with basaltics magmas. Geochemistry modeling shows this magma was formed from low rates of melt of a mantle font poor in garnet and then, evolved by fractional crystallization and crustal contamination. The main minerals that crystallize were plagioclase, olivine and pyroxene. São José do Jacuípe and Aroeira´s rock are petrographically and lithgeochemically similar and difficult to differentiate. However, characteristics of dyke´s rocks like presence of phenocrysts, absence of any other litho type associated, differences of granulation and of the metamorphic degree between dykes and the relations of contact with the other rocks allow differentiate them of the meta-gabbonorites of São José do Jacuípe suit. xxii Meta-gabronorito-PATM-01

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Clinopyroxene trace element compositions of cumulate mafic rocks and basalts from the Hercynian Moroccan Central Meseta: Petrogenetic implications

Cited by 25 publications

References 19 publications

Multi-scale isotopic heterogeneity reveals a complex magmatic evolution: An example from the wallundry suite granitoids of the lachlan fold belt, Australia

Multi-scale isotopic heterogeneity reveals a complex magmatic evolution: An example from the wallundry suite granitoids of the lachlan fold belt, Australia

Geologic interpretation of the aeromagnetic survey in the Agourai area (Central Morocco)

Geoquímica de rochas máficas da região de São José do Jacauípe, segmento norte do Orógeno Itabuna-Salvador-Curaçá, Cráton do São Francisco, Bahia

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