Trace element geochemistry of high alumina basalt - Andesite - Dacite - Rhyodacite lavas of the Main Volcanic Series of Santorini Volcano, Greece

Mann, A. C.

doi:10.1007/bf01132329

Cited by 66 publications

(21 citation statements)

References 33 publications

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“…HoweveS', the companion plot of Zr versus Th is inconsistent with mixing. In all of these examples the ratio, for values of Th greater than 10 ppm, is nearly constant and supports the suggestion that this large variation of Th concentration is due to crystal fractionation [Treuil and Varet, 1973;Allegre et al, 1977;Mann, 1983]. Because disequilibrium phenocrysts are abundant in samples from this magma type, magma mixing also occurred.…”

Section: Magma Type C Was Continuously Zoned and Was The Dominant Volsupporting

confidence: 79%

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Evolution of a Chemically Zoned Magma Body: Black Mountain Volcanic Center, southwestern Nevada

Vogel¹,

Noble²,

Younker³

1989

J. Geophys. Res.

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Rocks of the Black Mountain volcanic center consist of four ash flow sheets and units of lava that underlie, interfinger with, and overlie the sheets. Rocks from the center represent three magma types. Magma type c was present through the history of the center, whereas types a and b were available after the eruption of the Rocket Wash Member, during the eruptions of the Pahute Mesa and Trail Ridge members. The magma types are defined by trace element ratios; for example, magma types a, b, and c have La/Th values of 1.0–3.5, >7.5, and 3.5–7.5. Silica contents in the magma types a, b, and c range from 71.5 to 74.1, from 65.8 to 69.2, and from 55.6 to 73.8 wt %, respectively. The stratigraphic distribution of chemically distinct pumice fragments within the ash flow sheets is used to show that magma type a was located in the uppermost part of the chamber and was underlain successively by magma types b and c. Because pumice fragments that belong to all three magma types occur in individual cooling units, a zoned magma body must have existed during this period. Magma mixing is indicated by the disequilibrium phenocrysts which are common in pumice fragments from all magma types; however, this mixing did not destroy the original zoning of the upper part of the magma body. Most of the chemical variation of magma type c is consistent with fractionation of feldspar, olivine, and pyroxene, but abundant disequilibrium, mafic phenocrysts indicate that magma replenishment and mixing were common. Magma type b had much higher La/Th and light rare earth element (LREE)/heavy rare earth element values and must have originated independently from magma type c. Most likely the two types were derived from different source material. The low La/Th values of magma type a can be explained by separation of a phenocryst assemblage containing both a LREE‐bearing phase and zircon from either magma types b or c, or possibly by the partial melting of source material containing these phases.

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Section: Magma Type C Was Continuously Zoned and Was The Dominant Volsupporting

confidence: 79%

“…Zr also becomes compatible, along with Ca and P, and demonstrates that zircon and apatite were also being separated. Figures 7 and 10) [Mann, 1983]. These ratios for magma type b for La/Th, Ce/Th, Hf/Th, and Zr/Th are 10.6, 17.5, 1.05, and 45.2, respectively.…”

Section: Magma Type C Was Continuously Zoned and Was The Dominant Volmentioning

confidence: 85%

Evolution of a Chemically Zoned Magma Body: Black Mountain Volcanic Center, southwestern Nevada

Vogel¹,

Noble²,

Younker³

1989

J. Geophys. Res.

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“…The sum of squares of residuals for calculations of stage-1 and stage-2 does not exceed the acceptable upper limit (, 1.5: e.g. Mann, 1993;Tatsumi, 2001). In stage-2, although K-feldspar (0.9%) and biotite (0.2%) are calculated, these minerals cannot be regarded as important phases compared with those of plagioclase (58.3%) and hornblende (40.6%).…”

Section: Differentiation Of the Shiraishino Granodioritementioning

confidence: 97%

An adakitic pluton on Kyushu Island, southwest Japan arc

Kamei

2004

Journal of Asian Earth Sciences

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“…In the Aegean region Pe-Piper et al (1995) found a southward migration of volcanism. Calc-alkaline volcanism has characterized the Aegean volcanic arc from the Pliocene up to Recent times (Mann 1983;Barton & Huijsmans 1986;Briqueu et al 1986;Mitropoulos et al 1987;Huijsmans et al 1988;Francalanci et al 1998).…”

Section: Eastern Mediterranean (Greece and Turkey)mentioning

confidence: 99%

Tertiary-Quaternary subduction processes and related magmatism in the Alpine-Mediterranean region

Harangi

Downes

Seghedi³

2006

Memoirs

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Trace element geochemistry of high alumina basalt - Andesite - Dacite - Rhyodacite lavas of the Main Volcanic Series of Santorini Volcano, Greece

Cited by 66 publications

References 33 publications

Evolution of a Chemically Zoned Magma Body: Black Mountain Volcanic Center, southwestern Nevada

Evolution of a Chemically Zoned Magma Body: Black Mountain Volcanic Center, southwestern Nevada

An adakitic pluton on Kyushu Island, southwest Japan arc

Tertiary-Quaternary subduction processes and related magmatism in the Alpine-Mediterranean region

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