干旱区生态环境知识资源中心(Arid): Mineralogy and geochemistry of the In Allarene layered mafic-ultramafic igneous complex (In Ouzzal terrane, western Hoggar, South Algeria)-petrogenesis and geodynamic implications

Arid

DOI	10.1007/s12517-020-05895-6
	Mineralogy and geochemistry of the In Allarene layered mafic-ultramafic igneous complex (In Ouzzal terrane, western Hoggar, South Algeria)-petrogenesis and geodynamic implications
	Talbi, Mohamed; Bendaoud, Abderrahmane; Laouar, Rabah; Ouadahi, Sonia
通讯作者	Talbi, M
来源期刊	ARABIAN JOURNAL OF GEOSCIENCES
ISSN	1866-7511
EISSN	1866-7538
出版年	2020
卷号	13 期号:18
英文摘要	The In Allarene mafic-ultramafic complex is located at the southern part of the In Ouzzal terrane and was known as the unique Pan-African mafic-ultramafic intrusion in this terrane. The complex shows a ring-shaped intrusion of about 20 km(2)and concentric structures. Petrological observations and mineralogical analyses show that the core of the intrusion is composed of harzburgites and dunites surrounded by lherzolites, whereas the outer part consists of fine- to coarse-grained gabbros that are crosscut by dolerite dykes. The mineralogy and geochemistry of these rocks show that they are mainly cumulates, but some gabbros and dolerites have characteristics indicating that they correspond to magmatic liquids or they have trapped a variable amount of magmatic liquid. They correspond to the least magnesian and the most alkaline-rich gabbros and dolerites. The geochemistry of the gabbros and dolerites is very similar to the mafic-ultramafic complexes linked to arc zones and they exhibit all the features of the subduction zones magmatism as showing in the N-MORB normalization, with LILE enrichment relatively to HFSE, and Nb-Ta and Ti negative anomalies. The chemical compositions of clinopyroxene and spinel support this hypothesis. This is also the case for all geodynamic setting discrimination diagrams, both those using major elements and trace elements. Several of these diagrams also show that the studied rocks can be distinguished from intracontinental plate tholeiites, which can be very close geochemically to continental arc tholeiites. These results support the hypothesis of the existence of an arc-type metasomatized mantle under the In Ouzzal terrane during Pan-African orogeny.
英文关键词	In Ouzzal terrane Hoggar Pan-African orogeny Layered mafic-ultramafic igneous complex Arc-related magmatism
类型	Article ; Proceedings Paper
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000570953200001
WOS关键词	TRACE-ELEMENT GEOCHEMISTRY ; NW CHINA IMPLICATIONS ; TUAREG SHIELD ; EASTERN DESERT ; ALASKAN-TYPE ; ALGERIA ; ARC ; INTRUSIONS ; MAGMATISM ; EVOLUTION
WOS类目	Geosciences, Multidisciplinary
WOS研究方向	Geology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/326374
作者单位	[Talbi, Mohamed] FSTGAT USTHB, Fac Sci Terre Geog & Amenagement Terr, Lab Magmatisme & Metall Algerie, 32,El Alia, Algiers 16111, BP, Algeria; [Bendaoud, Abderrahmane; Laouar, Rabah; Ouadahi, Sonia] FSTGAT USTHB, Fac Sci Terre Geog & Amenagement Terr, Lab Geodynam Geol Ingn & Planetol, 32,El Alia, Algiers 16111, BP, Algeria; [Laouar, Rabah] Univ Badji Mokhtar Annaba, FST, Dept Geol, Annaba 23000, BP, Algeria
推荐引用方式 GB/T 7714	Talbi, Mohamed,Bendaoud, Abderrahmane,Laouar, Rabah,et al. Mineralogy and geochemistry of the In Allarene layered mafic-ultramafic igneous complex (In Ouzzal terrane, western Hoggar, South Algeria)-petrogenesis and geodynamic implications[J],2020,13(18).
APA	Talbi, Mohamed,Bendaoud, Abderrahmane,Laouar, Rabah,&Ouadahi, Sonia.(2020).Mineralogy and geochemistry of the In Allarene layered mafic-ultramafic igneous complex (In Ouzzal terrane, western Hoggar, South Algeria)-petrogenesis and geodynamic implications.ARABIAN JOURNAL OF GEOSCIENCES,13(18).
MLA	Talbi, Mohamed,et al."Mineralogy and geochemistry of the In Allarene layered mafic-ultramafic igneous complex (In Ouzzal terrane, western Hoggar, South Algeria)-petrogenesis and geodynamic implications".ARABIAN JOURNAL OF GEOSCIENCES 13.18(2020).