Pleniglacial sedimentation process reconstruction on laminated lacustrine sediments from lava-dammed Paleolake Alf, West Eifel Volcanic Field (Germany)

2017 ◽  
Vol 172 ◽  
pp. 83-95 ◽  
Author(s):  
Luise Eichhorn ◽  
Michael Pirrung ◽  
Bernd Zolitschka ◽  
Georg Büchel
Keyword(s):  
Lacustrine Sediments ◽  
Volcanic Field ◽  
Sedimentation Process ◽  
Process Reconstruction ◽  
West Eifel

scholarly journals New evidence for upper Permian crustal growth below Eifel, Germany, from mafic granulite xenoliths

2021 ◽  
Vol 33 (2) ◽  
pp. 233-247
Author(s):  
Cliff S. J. Shaw
Keyword(s):  
Rare Earth ◽  
Lower Crust ◽  
Volcanic Field ◽  
Upper Permian ◽  
Primitive Mantle ◽  
Magmatic Temperature ◽  
Heavy Rare Earth Elements ◽  
History Of ◽  
Granulite Xenoliths ◽  
West Eifel

Abstract. Granulite xenoliths from the Quaternary West Eifel Volcanic Field in Germany record evidence of magmatism in the lower crust at the end of the Permian. The xenoliths sampled two distinct bodies: an older intrusion (ca. 264 Myr old) that contains clinopyroxene with flat, chondrite-normalised rare earth element (REE) profiles and a younger (ca. 253 Myr old) intrusion that crystallised middle-REE-rich clinopyroxene. The younger body is also distinguished based on the negative Sr, Zr and Ti anomalies in primitive mantle-normalised multi-element plots. REE-in-plagioclase–clinopyroxene thermometry records the magmatic temperature of the xenoliths (1100–1300 ∘C), whereas Mg-in-plagioclase and Zr-in-titanite thermometry preserve an equilibration temperature of ca. 800 ∘C. These temperatures, together with a model of the mineral assemblages predicted from the composition of one of the xenoliths, define the pressure of crystallisation as ∼1 GPa. The xenoliths also preserve a long history of reheating events whose age ranges from 220 to 6 Myr. The last of these events presumably led to breakdown of garnet; formation of symplectites of orthopyroxene, plagioclase and hercynite; and redistribution of heavy rare earth elements into clinopyroxene. The data from the West Eifel granulite xenoliths, when combined with the existing data from granulites sampled in the East Eifel, indicate that the lower crust has a long a complex history stretching from at least 1.6 Ga with intrusive events at ca. 410 and 260 Ma and reheating from the Triassic to late Miocene.

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.

Highly siderophile elements (PGE, Re and Au) in mantle xenoliths from the West Eifel volcanic field (Germany)

2003 ◽  
Vol 196 (1-4) ◽  
pp. 77-105 ◽  
Author(s):  
Gerhard Schmidt ◽  
Gudrun Witt-Eickschen ◽  
Herbert Palme ◽  
Hans Seck ◽  
Bernhard Spettel ◽  
...  
Keyword(s):  
Volcanic Field ◽  
Mantle Xenoliths ◽  
The West ◽  
Highly Siderophile Elements ◽  
Siderophile Elements ◽  
West Eifel

scholarly journals Regional Variations in the Mineralogy of Metasomatic Assemblages in Mantle Xenoliths from the West Eifel Volcanic Field, Germany

2005 ◽  
Vol 46 (5) ◽  
pp. 945-972 ◽  
Author(s):  
CLIFF S. J. SHAW ◽  
JIMENA EYZAGUIRRE ◽  
BRIAN FRYER ◽  
JOEL GAGNON
Keyword(s):  
Volcanic Field ◽  
Mantle Xenoliths ◽  
The West ◽  
Regional Variations ◽  
West Eifel
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