Pargasitic-kaersutitic amphibole from a basanitic diatreme at the Rosenberg, North of Kassel (North Germany)

Vinx, Roland; Jung, Dieter

doi:10.1007/bf00371053

Cited by 28 publications

(5 citation statements)

References 23 publications

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“…Crystallization within the crust was proposed for the kaersutites from east Fife, Scotland (Chapman, 1976), and Frechen (1972) suggested that the amphiboles from Dreiser Weiher crystallized from alkali-basaltic melts in a subvolcanic magma chamber. Best (1974) concluded that amphiboles from the mantle generally contain less Ti and more AI than those from the upper crust, and Vinx and Jung (1977) therefrom proposed that the amphibole megacrysts from Rosenberg, Germany came from the mantle.…”

Section: T a B L E V I Selected Analyses Of Megacryst Kaersutites Anmentioning

confidence: 99%

“…Kaersutite (Leake, 1978) is the best name for most of them, and perhaps titaniferous pargasite for those with lower TiO 2. The crystals are chemically and optically homogeneous with no signs of zoning, though at any individual locality, the kaersutites may show considerable variation with respect to Mg and Fe, suggesting some fractionation (Irving 1974c;Vinx and Jung, 1977).…”

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confidence: 99%

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Upper-mantle amphiboles: a review

Dawson

Smith

1982

Mineral. mag.

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Textural and chemical data are reviewed for amphiboles occurring in Cr-diopside series and Al-augite series xenoliths; as megacrysts in a variety of igneous environments; and also as minor phases in tectonic slices of upper-mantle peridotite. New data are given for pargasite and associated phases in a lherzolite from Tanzania and in kelyphite replacing garnet in a S. African kimberlite xenolith. It is concluded that only pargasites and titaniferous pargasites occurring in Cr-diopside series blocks have formed under upper-mantle conditions. Although amphibole is present in the upper mantle, as suggested by Oxburgh (1964), its relative paucity suggests it is not a major alkali and water storage site; phlogopite is a more likely candidate, particularly in the deeper parts of the upper mantle.

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Section: T a B L E V I Selected Analyses Of Megacryst Kaersutites Anmentioning

confidence: 99%

mentioning

confidence: 99%

Upper-mantle amphiboles: a review

Dawson

Smith

1982

Mineral. mag.

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“…Amphibole megacrysts in Monteregian dykes are generally composed of titanian potassian pargasite or magnesio hastingsite. As in other megacryst suites (Best, 1974;Francis, 1976a, b;Becker, 1977;Vinx and Jung, 1977), they tend to have higher Mg and A1, and lower Ti than the phenocryst and groundmass amphiboles (Figs. 4 and 5).…”

Section: Si+na+kmentioning

confidence: 69%

Comparative amphibole chemistry of the Monteregian and White Mountain alkaline suites, and the origin of amphibole megacrysts in alkali basalts and lamprophyres

Bédard

1988

Mineral. mag.

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Amphiboles in dykes from the dominantly silica-undersaturated Monteregian series range from pargasitic megacrysts and xenocrysts to kaersutitic, pargasitic and hastingsitic phenocrysts, groundmass prisms and reaction rims. Amphiboles in dykes and plutons from the silica-oversaturated White Mountain Magma Series range from kaersutite, through hornblende, hastingsite and edenite, to sodic-calcic and sodic varieties. This contrast between the amphiboles from the two series is probably a reflection of differing melt silica activity and is a useful petrologic discriminant. In most cases, pargasitic amphibole megacrysts from Montereglan monchiquites reflect the Mg numbers of their host rocks and are considered cognate. The megacrysts are lower in Ti and higher in Mg and AI than their phenocryst mantles and rims. This is probably a result of higher pressures of formation.

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“…Many andesite clasts in the volcanic conglomerates exhibit distinct banding, apparently related to compositional heterogeneity. Identical features have been described from other hybrid suites (e.g, Anderson 1976) and it is possible that Vinx & Jung 1977). Field K denotes kaersutites of shallow crustal origin, and field M covers mantlederived amphibole megacrysts (Best 1974). these eruptive rocks represent a similar, if not the same, mixing event.…”

Section: Discussionmentioning

confidence: 89%

Age, petrology and geochemistry of Wairakau Andesites, Whangaroa, Northland

White¹

1985

New Zealand Journal of Geology and Geophysics

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The Wairakau Andesites of Whangaroa, New Zealand, are predominantly andesitic to rhyolitic volcanogenic sediments, with some intrusives and possibly lava flows. K-Ar radiometric age determinations indicate an Early Miocene age, rather than Pliocene-Pleistocene as previously reported.The most abundant rock type is andesite, which contains phenocrysts of plagioclase, clinopyroxene, and lesser orthopyroxene, hornblende and olivine. In some of the andesites, data from electron microprobe analyses record abrupt and commonly reverse compositional zoning in phenocrysts. This and textural evidence for disequilibrium are consistent with mixing and/or assimilation processes. Al-rich pyroxenes and amphiboles present in many samples may represent lower crustal xenocrysts, though garnet, which occurs in other Northland andesites, was not found.Major imd trace element analyses show that the Wairakau Andesites are a moderate to high-K calcalkaline ·suite, with relatively high Rb, Th, Zr and Ni contents. Geochemical comparison with the Waitakere and Coromandel Groups does not support the hypothesis of a Miocene Benioffzomi parallel to the Northland peninsula. It is possible that the Wairakau Andesites of Whangaroa were generated above a northwesterly dipping subduction system or from obduction-related processes.

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Pargasitic-kaersutitic amphibole from a basanitic diatreme at the Rosenberg, North of Kassel (North Germany)

Cited by 28 publications

References 23 publications

Upper-mantle amphiboles: a review

Upper-mantle amphiboles: a review

Comparative amphibole chemistry of the Monteregian and White Mountain alkaline suites, and the origin of amphibole megacrysts in alkali basalts and lamprophyres

Age, petrology and geochemistry of Wairakau Andesites, Whangaroa, Northland

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