Polybaric differentiation of alkali basaltic magmas: evidence from green-core clinopyroxenes (Eifel, FRG)

Duda, Antje; Schmincke, H.-U.

doi:10.1007/bf00374690

Cited by 167 publications

(70 citation statements)

References 37 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…During this period, approximately 1.7 km 3 of magma was erupted and around 50 km 3 supplied to the base of the crust (Mertes and Schmincke 1985;Schmincke 2007). The West Eifel field has been described in detail by Duda and Schmincke (1985); Mertes and Schmincke (1983); Mertes and Schmincke (1985); Schmincke (2007) and only a brief summary is given here. The lavas were emplaced through Devonian and locally Triassic sedimentary rocks and Tertiary clays.…”

Section: Geological Settingmentioning

confidence: 97%

Structure and evolution of the Rockeskyllerkopf Volcanic Complex, West Eifel Volcanic Field, Germany

et al. 2010

View full text Add to dashboard Cite

The Rockeskyllerkopf Volcanic Complex (RVC) comprises three overlapping monogenetic volcanic centers: Southeast Lammersdorf (SEL), Mäuseberg (M) and Rockeskyllerkopf (RKK). Each volcanic center comprises proximal wall deposits with a well defined crater wall unconformity and crater fill deposits that partially to completely cover the outer crater wall. The SEL Center is a phreatomagmatic tuff ring composed of lithic rich tephra deposited by pyroclastic falls and surges. The second center, Mäuseberg, with its crater to the northwest of the SEL Center is predominantly magmatic. Topographic and outcrop patterns suggest that this center may have formed a series of overlapping scoria cones along a N-S trending fissure. The youngest center, RKK, which lies on a poorly developed palaeosol within the earlier Mäuseberg deposits, comprises a well developed proximal crater wall sequence. This sequence of magmatic, likely Strombolian, fall and grain avalanche deposits passes upward into a crater fill sequence that comprises variably welded bombs. The final eruptions in the center were massive lava flows that were ponded within the RKK crater. Ar-Ar age dating of reequilibrated fragments of phlogopite megacrysts in the SEL lavas indicates volcanic activity began at 474±39 ka. Literature K-Ar dates for the youngest lava flows in the RKK Center give ages of 360±60 to 470 ka. Our interpretation of the age data and the presence of the poorly developed palaeosol between the Mäuseberg and RKK centers indicates that volcanism in the RVC began around 470 ka with the eruption of the SEL and Mäuseberg centers followed a few thousand years later by the eruption of the RKK Center.

show abstract

Section: Geological Settingmentioning

confidence: 97%

Structure and evolution of the Rockeskyllerkopf Volcanic Complex, West Eifel Volcanic Field, Germany

et al. 2010

View full text Add to dashboard Cite

show abstract

“…Mitchell & Bergman 1991). Typical "green cores" presented from Cenozoic basaltic rocks from, for example, Germany (Duda & Schmincke 1985;Abratis et al 2009) have not been ascertained. Occurrence of resorbed cores of Cr-rich diopside characteristic for melilitic rocks of the SW German Tertiary Volcanic Province (Dunworth & Wilson 1998) implying their origin from mantle xenoliths was also not found at the localities studied.…”

Section: Crystallization History Of Melilitic Rocksmentioning

confidence: 99%

Upper Cretaceous to Pleistocene melilitic volcanic rocks of the Bohemian Massif: petrology and mineral chemistry

Skála¹,

Ulrych²,

Ackerman³

et al. 2015

Geologica Carpathica

View full text Add to dashboard Cite

ratios (0.7033-0.7049) point to an additional late-to post-magmatic hydrothermal contribution. Major rock-forming minerals include forsterite, diopside, melilite, nepheline, sodalite group minerals, phlogopite, Cr-and Ti-bearing spinels. Crystallization pressures and temperatures of clinopyroxene vary widely between ~1 to 2 GPa and between 1000 to 1200 °C, respectively. Nepheline crystallized at about 500 to 770 °C. Geochemical and isotopic similarities of these rocks occurring from the Upper Cretaceous to Pleistocene suggest that they had similar mantle sources and similar processes of magma development by partial melting of a heterogeneous carbonatized mantle source.

show abstract

“…The origin of such green clinopyroxenes has been studied extensively during the past decades and this has resulted in different interpretations (e.g. Brooks and Printzlau 1978;Wass 1979;Duda and Schmincke 1985). Dobosi (1989) described two kinds of anhedral green clinopyroxene cores in the Nógrád basalts: olive-green (fassaites and fassaitic augites) and grass-green (salites and ferrosalites).…”

Section: A Mineral-scale Investigation Of the Origin Of The Füzes-tó mentioning

confidence: 99%

A mineral-scale investigation of the origin of the 2.6 Ma Füzes-tó basalt, Bakony-Balaton Highland Volcanic Field (Pannonian Basin, Hungary)

Jankovics

Harangi

Ntaflos³

2009

Central European Geology

View full text Add to dashboard Cite

The alkaline basalt of the Füzes-tó scoria cone is the youngest volcanic product of the BakonyBalaton Highland Volcanic Field. The bombs and massive lava fragments are rich in various crystals, such as mantle-derived xenocrysts (olivine, orthopyroxene, clinopyroxene, spinel), high-pressure mineral phases (clinopyroxene) and phenocrysts (olivine, clinopyroxene). Peridotite xenoliths are also common. Ratios of incompatible trace elements (Zr/Nb and Nb/Y) suggest that the primary magma was formed in the transitional spinel-garnet stability field, at the uppermost part of the asthenosphere. Magmatic spinel inclusions with low-Cr# (22-35) in olivine phenocrysts can reflect a fertile peridotite source. The olivine, orthopyroxene, colourless clinopyroxene and spinel xenocrysts are derived from different depths of the subcontinental lithospheric mantle and their compositions resemble the mineral phases of the ultramafic xenoliths found in this region. The rarer green clinopyroxene cores of clinopyroxene phenocrysts could represent high-pressure products of crystallization from a more evolved melt than the host magma, or they could be derived from mafic lower crustal rocks. Crystallization of the basaltic magma resulted in olivine and clinopyroxene phenocrysts. Their compositions reflect polybaric crystallization with a final, strongly oxidized stage. The Füzes-tó basalt does not represent a certain magma composition, but a mixture of mineral phases having various origin and mantle-derived basaltic melt.

show abstract

Polybaric differentiation of alkali basaltic magmas: evidence from green-core clinopyroxenes (Eifel, FRG)

Cited by 167 publications

References 37 publications

Structure and evolution of the Rockeskyllerkopf Volcanic Complex, West Eifel Volcanic Field, Germany

Structure and evolution of the Rockeskyllerkopf Volcanic Complex, West Eifel Volcanic Field, Germany

Upper Cretaceous to Pleistocene melilitic volcanic rocks of the Bohemian Massif: petrology and mineral chemistry

A mineral-scale investigation of the origin of the 2.6 Ma Füzes-tó basalt, Bakony-Balaton Highland Volcanic Field (Pannonian Basin, Hungary)

Contact Info

Product

Resources

About