Late Mesozoic to Quaternary intraplate magmatism and its relation to the Neoproterozoic lithosphere in NE Africa—New data from lower-crustal and mantle xenoliths from the Bayuda volcanic field, Sudan

2011 ◽  
pp. 1-24 ◽  
Author(s):  
Friedrich Lucassen ◽  
Gerhard Franz ◽  
Rolf L. Romer ◽  
Peter Dulski
Keyword(s):  
Volcanic Field ◽  
Mantle Xenoliths ◽  
Late Mesozoic ◽  
Intraplate Magmatism ◽  
Ne Africa ◽  
Lower Crustal

Petrology of Lower Crustal and Upper Mantle Xenoliths from the Cima Volcanic Field, California

1991 ◽  
Vol 32 (1) ◽  
pp. 169-200 ◽  
Author(s):  
H. G. WILSHIRE ◽  
A. V. McGUIRE ◽  
J. S. NOLLER ◽  
B. D. TURRIN
Keyword(s):  
Upper Mantle ◽  
Volcanic Field ◽  
Mantle Xenoliths ◽  
Lower Crustal ◽  
Cima Volcanic Field

scholarly journals Slab-derived metasomatism in the Carpathian-Pannonian mantle revealed by investigations of mantle xenoliths from the Bakony-Balaton Highland Volcanic Field

Lithos ◽  
2017 ◽  
Vol 286-287 ◽  
pp. 534-552 ◽  
Author(s):  
Laura Créon ◽  
Guillaume Delpech ◽  
Virgile Rouchon ◽  
François Guyot
Keyword(s):  
Volcanic Field ◽  
Mantle Xenoliths

Isotopic and geochemical investigation of a carbonatite-syenite-phonolite diatreme, West Eifel (Germany)

1999 ◽  
Vol 63 (5) ◽  
pp. 615-631 ◽  
Author(s):  
T. R. Riley ◽  
D. K. Bailey ◽  
R. E. Harmer ◽  
H. Liebsch ◽  
F. E. Lloyd ◽  
...  
Keyword(s):  
Close Association ◽  
Alkaline Rock ◽  
Volcanic Field ◽  
Mantle Xenoliths ◽  
Volcanic Complex ◽  
The West ◽  
The North ◽  
Rock Types ◽  
Depleted Mantle ◽  
West Eifel

AbstractThe Rockeskyll complex in the north, central part of the Quaternary West Eifel volcanic field encapsulates an association of carbonatite, nephelinite and phonolite. The volcanic complex is dominated by three eruptive centres, which are distinct in their magma chemistry and their mode of emplacement. The Auf Dickel diatreme forms one centre and has erupted the only known carbonatite in the West Eifel, along with a broad range of alkaline rock types. Extrusive carbonatitic volcanism is represented by spheroidal autoliths, which preserve an equilibrium assemblage. The diatreme has also erupted xenoliths of calcite-bearing feldspathoidal syenite, phonolite and sanidine and clinopyroxene megacrysts, which are interpreted as fragments of a sub-volcanic complex. The carbonate phase of volcanism has several manifestations; extrusive lapilli, recrystallized ashes and calcite-bearing syenites, fragmented during diatreme emplacement.A petrogenetic link between carbonatites and alkali mafic magmas is confirmed from Sr and Nd isotope systematics, and an upper mantle origin for the felsic rocks is suggested. The chemistry and mineralogy of mantle xenoliths erupted throughout the West Eifel indicate enrichment in those elements incompatible in the mantle. In addition, the evidence from trace element signatures and melts trapped as glasses support interaction between depleted mantle and small volume carbonate and felsic melts. This close association between carbonate and felsic melts in the mantle is mirrored in the surface eruptives of Auf Dickel and at numerous alkaline-carbonatite provinces worldwide.

Amphibole lamellae formation in the upper mantle due to interaction of fluid inclusions and host minerals: a case study from Persani Mountains Volcanic Field, Transylvania

2020 ◽  
Author(s):  
Thomas Pieter Lange ◽  
Zsófia Pálos ◽  
Levente Patkó ◽  
Márta Berkesi ◽  
Nóra Liptai ◽  
...  
Keyword(s):  
Fluid Inclusion ◽  
Fluid Inclusions ◽  
Upper Mantle ◽  
Volcanic Field ◽  
Planetary Science ◽  
Mantle Xenoliths ◽  
Fluid Inclusion Study ◽  
Chemical Components ◽  
Major Element Composition ◽  
Host Mineral

<p>Amphibole is one of the most abundant ’water’-bearing minerals in the Earth’s upper mantle. Amphiboles occur as interstitial grains, lamellae within pyroxenes or as daughter minerals within fluid inclusions.  Most commonly amphibole formation is related to mantle metasomatism, where the agent has a subducted slab (e.g. Manning 2004) or an asthenospheric origin (e.g. Berkesi et al. 2019).  After the formation of fluid inclusions, a subsolidus interaction can take place where the H<sub>2</sub>O content of fluid inclusions may crystallize pargasite (e.g. Plank et al. 2016).</p><p>Here we present amphibole lamellae formation in mantle xenoliths from the Persani Mountains Volcanic Field that is interrelated to a reaction between fluid inclusions and host clinopyroxene.  Newly formed amphibole lamellae occur only in the surroundings of the fluid inclusions and grow within the host clinopyroxene in a preferred crystallographic direction.  Studied lamellae do not reach the rim of the host mineral implying that components needed for formation of amphibole lamellae in clinopyroxene could have only originated from the fluid inclusion itself.  We measured the major element composition of amphibole lamellae and host clinopyroxene (1) and used Raman spectroscopy and FIB-SEM on fluid inclusion study situated next to the lamellae (2).  Results support the hypothesis that chemical components (dominantly H<sup>+</sup>) migrated sub-solidus from the fluid inclusion into the host mineral after fluid entrapment via subsolidus interaction.  Beyond the clinopyroxene-hosted fluid inclusions, fluid inclusions in orthopyroxenes were also studied as a reference.  Our study shows that post-entrapment diffusion from a fluid inclusion into the host mineral changes the solid/fluid ratio of the mantle  which could modify the rheology of the lithospheric mantle.</p><p>Berkesi, M. et al. 2019. Chemical Geology, 508, 182-196.</p><p>Kovács et al. (2017) Acta Geodaetica et Geophysica, 52(2), 183-204.</p><p>Manning C. E. 2004. Earth and Planetary Science Letters, 223, 1-16.</p><p>Plank, T. A. et al. 2016. In AGU Fall Meeting Abstracts.</p>

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