Pyroxenites and hornblendites from the maar-type volcanoes of the Westeifel, Federal Republic of Germany

Becker, H.

doi:10.1007/bf00373569

Cited by 33 publications

(10 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Peridotite xenoliths and less frequently pyroxe nite and amphibole-rich xenoliths of mantle or lower crustal derivation have been described in different areas of the lberian Peninsula (Ancochea and Nix on, 1987; Capedri et ai., 1 989) and from western and central Europe (Becker, 1977;Praegel, 1981 ;Hunter and U pton, 1987;Downes et al, 2001;Upton et ai., 2001;Downes et al, 2002;Carraro and VisOrul, 2003;Witt-Eickschen and Kramm , 1998). These xenolith suites are mainly enclosed within host alkaline volcanic rocks with ages ranging from Cenozoic to Quaternary times.…”

Section: Introductionmentioning

confidence: 99%

Geochemistry of pyroxenitic and hornblenditic xenoliths in alkaline lamprophyres from the Spanish Central System

García

Villaseca

Paterson

2006

Lithos

View full text Add to dashboard Cite

The alkaline lamprophyres and diabases of the Spanish Central System carry a heterogeneous suite of xenoliths which includes scarce pyroxenitic and hornblenditic types that can be divided in two groups: (a) pyroxenite xenoliths, including spinel clinopyroxenites and spinel websterites with granoblastic textures, and (b) hornblende-bearing clinopyroxenites and hornblen dites (here after called hornblenditic xenoliths) characterised by the presence of Ti-rich kaersutitic amphibole and magmatic textures, Both groups of xenoliths can be assigned to the Al-augite series of Wilshire and Shervais (1975) xenolith suite has a very homogeneous isotopic composition, close to the isotopically depleted values of high ENd and low 87 Sr/ 86 Sr ratios of one of the pyroxenite xenoliths, Some of these ultramafic xenoliths fall within the isotopic compositional range of their host alkaline dykes, which also define a bipolar compositional field, suggesting that most of them are cogenetic with the lamprophyres, P-T estimates yield temperatures in the range of 970-1 080 °c and pressures mainly from 0,9 to 1,2 GPa for pyroxenites, whilst hornblenditic xenoliths give lower (and probably underestimated) pressures (0,7-0,9 GPa), This pressure range is in agreement with pyroxenites being fonned by an underplating event at the upper mantle-lower crust boundary, whereas pressure estimates for hornblenditic xenoliths suggest equilibration within the lower crust

show abstract

Section: Introductionmentioning

confidence: 99%

Geochemistry of pyroxenitic and hornblenditic xenoliths in alkaline lamprophyres from the Spanish Central System

García

Villaseca

Paterson

2006

Lithos

View full text Add to dashboard Cite

show abstract

“…100 Fe 2+ / (Fe 2+ + Mg) v. 100 Cr / (Cr + Al) diagram. Circled areas are for the lherzolite spinels, LzSp, and for the harzburgite and depleted lherzolite spinels, HzSp, of the West Eifel nodules, drawn after the data of Becker (1977), Stosch and Seck (1980), Sachtleben and Seck (1981), and . Figure 10.…”

Section: Resultsmentioning

confidence: 99%

“…They plot in the high Al VI amphibole field (MAm, Fig. 8A) drawn after the data of Becker (1977) and Shaw and Eyzaguirre (2000). These phases originated from upper mantle to lower crust cumulates and veins of amphibole-bearing pyroxenites, which derived from different magma batches, as shown by their variable alkaline ratios and Mg numbers ( Fig.…”

Section: Magmatic Signature Of the Amphibolesmentioning

confidence: 99%

“…Their analyses plot in the MCPX area of Figure 7. The third type, more-or less-enriched in Ti, includes the common pyroxenes of the alkaline lavas: VCPX area of Figure 7, drawn from Eifel analyses (Becker, 1977;Schmincke, 1978, 1985; unpublished new data from sampling of West Eifel maars). The group 1 clinopyroxenes of the Rocourt Tephra overlap the lherzolitic and the high-pressure pyroxene domains.…”

Section: Magmatic Signature Of the Pyroxenesmentioning

confidence: 99%

See 1 more Smart Citation

The Rocourt Tephra, a Widespread 90–74 ka stratigraphic marker in Belgium

Pouclet¹,

Juvigné

Pirson

2008

Quat. res.

View full text Add to dashboard Cite

A new study of the stratigraphy and composition of the Rocourt Tephra is performed at five sites in Belgium and brackets the age of the tephra between 90.3 and 74 ka. The volcanic glass grains have a typical shape of phreatomagmatic eruption products. A large set of tephra minerals were analyzed, namely clinopyroxene, orthopyroxene, amphibole, and Cr-spinel. The compositions of these minerals have been compared with the lava xenocrysts, megacrysts, and phenocrysts of the proximate Eifel volcanic province for which the origin has been determined (mantle xenoliths, high-pressure cumulates, and middle- to low-pressure magmatic phases). This allowed us to determine the likely origin of the tephra minerals. The Rocourt Tephra source could be a West Eifel volcano that was fed by a deep-seated magma batch rich in high- to middle-pressure minerals.

show abstract

“…These have a range of names in the literature, including cognate xenoliths or nodules: here, we will refer to them as glassy crystalline enclaves or simply enclaves. These entrained fragments of deep mush are relatively common in the eruptive products of currently active or recent volcanoes [23][24][25][26][27][28][29][30][31] (a) The leucocratic portion of a modal layer from Trough G in Upper Zone. Plagioclase is teal (with darker colours showing more sodic compositions), interstitial phases are quartz (black) and clinopyroxene (grey).…”

Section: How Can We Study Crystal Mushy Zones?mentioning

confidence: 99%

Magma chambers versus mush zones: constraining the architecture of sub-volcanic plumbing systems from microstructural analysis of crystalline enclaves

Holness

Stock

Geist

2019

Phil. Trans. R. Soc. A.

View full text Add to dashboard Cite

show abstract

Pyroxenites and hornblendites from the maar-type volcanoes of the Westeifel, Federal Republic of Germany

Cited by 33 publications

References 20 publications

Geochemistry of pyroxenitic and hornblenditic xenoliths in alkaline lamprophyres from the Spanish Central System

Geochemistry of pyroxenitic and hornblenditic xenoliths in alkaline lamprophyres from the Spanish Central System

The Rocourt Tephra, a Widespread 90–74 ka stratigraphic marker in Belgium

Magma chambers versus mush zones: constraining the architecture of sub-volcanic plumbing systems from microstructural analysis of crystalline enclaves

Contact Info

Product

Resources

About